CN116600395A

CN116600395A - Signal processing method, device and readable storage medium

Info

Publication number: CN116600395A
Application number: CN202310409947.7A
Authority: CN
Inventors: 吴方舟; 董朋朋; 祝慧颖; 王婷
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2023-04-13
Filing date: 2023-04-13
Publication date: 2023-08-15

Abstract

The application relates to the field of mobile communication, which can be applied to the frames of protocols such as NR or 6G, and the like, in particular to a signal processing method, a signal processing device and a readable storage medium, wherein the method comprises the following steps: one or more OFDM symbols are obtained and transmitted, the one or more OFDM symbols are carried on the same resource block, the same resource block comprises N subcarriers, the N subcarriers comprise M charging subcarriers and K data subcarriers, the intersection of the M charging subcarriers and the K data subcarriers is an empty set, the charging subcarriers carry the charging symbols, and the data subcarriers carry the data symbols. By adopting the embodiment of the application, the coexistence of wireless energy transmission and data transmission can be realized, and the influence of the wireless energy transmission on the data transmission is reduced.

Description

Signal processing method, device and readable storage medium

Technical Field

The present application relates to the field of communications technologies, and in particular, to a signal processing method, a signal processing device, and a readable storage medium.

Background

With the development of wireless networks and the increase of business demands, there are massive internet of things (internet of things, ioT) devices in the networks. These IoT devices are low cost, small in size, unable to carry large capacity batteries, and face the problem of short standby life. In order to solve the problem of short standby lifetime of IoT devices, it has been proposed to use an environmental energy harvesting method to provide energy for IoT devices. The wireless radio frequency energy is one of candidate energy sources, and has the advantages of controllable energy size and energy source, certain penetrating power and long transmission distance.

The current radio frequency energy collection scheme mainly considers the collection of the radio electromagnetic waves existing in the natural environment, but because the energy sources are not matched and synergistically optimized, the energy collection efficiency is very low, and the daily use requirements of the IoT devices cannot be met. In cellular mobile communication networks, a large number of base stations are deployed, and the base stations are usually provided with multiple antennas, and can emit arbitrarily designed electromagnetic waves in different frequency bands and/or time periods and provide directional beams to enhance radio frequency energy in certain directions, so that the efficiency of energy transmission can be improved to a certain extent. Thus, wireless energy transfer (wireless energy transfer, WPT) through a base station is one of the important approaches to solve IoT device battery life shortages in the future.

Because the network side equipment for transmitting the energy is the base station, how to ensure that the wireless energy transmission of the base station does not influence the data transmission is to be explored, that is, how to realize the coexistence of the wireless energy transmission and the data transmission is to be solved.

Disclosure of Invention

The embodiment of the application provides a signal processing method, a signal processing device and a readable storage medium, which can realize coexistence of wireless energy transmission and data transmission and reduce the influence of the wireless energy transmission on the data transmission.

The application is described below in terms of various aspects, with the understanding that the embodiments and advantages of the various aspects below may be referenced to one another.

In a first aspect, the present application provides a signal processing method, the method comprising: the transmitting end obtains a plurality of orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) symbols and transmits the plurality of OFDM symbols, respectively (the plurality of OFDM symbols may be superimposed on the air), or the transmitting end superimposes the plurality of OFDM symbols into one OFDM symbol to transmit. The plurality of OFDM symbols are carried on the same resource block(s), indicating that the plurality of OFDM symbols coincide in both the time and frequency domains. The same resource block contains N subcarriers including M charged subcarriers and K data subcarriers. The intersection of the M charging subcarriers and the K data subcarriers is a null set, that is, the charging subcarriers and the data subcarriers are located on different frequency points. One charging subcarrier carries one or more charging symbols, it will be appreciated that since the charging symbols do not carry data information, demodulation is not required, and multiple charging symbols can be carried on one subcarrier. One data subcarrier is used to carry one data symbol. Wherein N, M, K are all positive integers.

In the present application, the charging subcarrier may be understood as a subcarrier allocated to charging, and the data subcarrier may be understood as a subcarrier allocated to data transmission, which will not be described in detail below.

In the present application, "obtaining" may include that the sender receives from other entities and/or is generated by the sender itself, which will not be described in detail below.

The transmitting end may be a base station, for example.

Because the charging symbols and the data symbols are carried on different subcarriers, the application avoids the interference among the symbols, so the coexistence of wireless energy transmission and data transmission can be realized, and the influence of the wireless energy transmission on the data transmission is reduced.

It will be appreciated that, before the transmitting end transmits the OFDM symbol, one or more OFDM symbols to be transmitted may be transmitted after a series of processing, such as one or more of parallel-to-serial conversion, windowing, cyclic Prefix (CP), or power amplification.

In a second aspect, the present application provides a communication device, which may be a transmitting end or a chip or circuit provided in or applied to the transmitting end, for performing steps or functions performed by the transmitting end. The communication device includes: a processing unit and a transceiver unit. Wherein, the processing unit is used for obtaining a plurality of OFDM symbols; and the receiving and transmitting unit is used for transmitting one or more OFDM symbols. Optionally, the processing unit is further configured to superimpose the plurality of OFDM symbols into one OFDM symbol, so that the transceiver unit transmits the one OFDM symbol. The plurality of OFDM symbols are carried on the same resource block, meaning that the plurality of OFDM symbols coincide in both the time and frequency domains. The same resource block contains N subcarriers including M charged subcarriers and K data subcarriers. The intersection of the M charging subcarriers and the K data subcarriers is a null set, that is, the charging subcarriers and the data subcarriers are located on different frequency points. One charging subcarrier carries one or more charging symbols and one data subcarrier is used to carry one data symbol. Wherein N, M, K are all positive integers.

With reference to the first or second aspect, in one possible implementation manner, the plurality of OFDM symbols are carried on the same resource, and the same resource block includes N subcarriers, where the N subcarriers include M charging subcarriers and K data subcarriers, which can be understood as: a portion of the plurality of OFDM symbols is carried on the K data subcarriers and another portion of the plurality of OFDM symbols is carried on the M charging subcarriers. Or, part of the plurality of OFDM symbols have energy on the data subcarriers of the N subcarriers and have no energy on the charging subcarriers; while the other part of OFDM symbols has energy on the charged subcarriers of the N subcarriers and no energy on the data subcarriers.

The present application refers to subcarriers without energy on subcarriers as null subcarriers, and will not be described in detail below.

With reference to the first or second aspect, in one possible implementation manner, a part of OFDM symbols in the plurality of OFDM symbols includes pilot symbols and data symbols, and another part of OFDM symbols includes charging symbols. Of course, one OFDM symbol may also include a charging symbol, a pilot symbol, and a data symbol, which is not limited by the present application, but is only illustrated herein. The pilot symbols are used for channel estimation to assist demodulation of the data symbols, and the energy charging symbols are used for energy transmission, and the energy transmission efficiency is improved through a specific design. The pilot symbols are known to both parties of the communication, the positions in the OFDM symbols are determined, and the sub-carriers carrying the pilot symbols are also determined, used for channel estimation. While the charging symbols do not carry data information, do not require demodulation, are unknown to the receiving end, and are variable in position in the OFDM symbols, used to transmit energy.

With reference to the first or second aspect, in one possible implementation manner, a charging symbol carried on the charging subcarrier is a predefined symbol. Or the charging symbol carried on the charging subcarrier is obtained by preprocessing a predefined symbol. The preprocessing includes adjustment of amplitude and/or phase, as described in particular in example one below. It can be understood that the method and the device can compensate the phase and amplitude offset brought by the wireless channel and improve the conversion efficiency of wireless energy by preprocessing the predefined symbol and then carrying the symbol on the charged sub-carrier for transmission.

Optionally, the predefined symbol satisfies one or more of:

wherein the phase of each predefined symbol +.>The same and a predefined value;

wherein the phase of each predefined symbol +.>Respectively predefined values;

in which the amplitude a of the predefined symbol _i,k And/or phase b _i,k Belonging to a predefined random distribution.

Wherein the value of k is the index of the M charging subcarriers. i represents an OFDM symbol at the i-th time. X is X _i,k Representing a predefined symbol corresponding to a charged subcarrier with index k in the OFDM symbol at the i-th time.

When the predefined symbol is At this time, due to the phase of each predefined symbol +.>Identical, so each predefined symbol is identical, then M sine waves can be formed after transforming the M predefined symbols to the time domain via inverse fast fourier transform (inverse fast fourier transform, IFFT), and the peaks of the M sine waves overlap. So when the predefined symbol is +>When the OFDM signal received by the receiving end has higher peak-to-average power ratio (PAPR), more energy can be higher than the starting voltage of the rectifier, so that the energy charging efficiency is improved.

Predefined in the present application may be understood as setting, presetting, predefining, storing, pre-negotiating, curing, pre-firing, etc.

With reference to the first or second aspect, in one possible implementation manner, the charging symbol carried on the charging subcarrier is obtained after the charging bits in the charging bit sequence are modulated. Or the charging symbol carried on the charging subcarrier is obtained by modulating and preprocessing the charging bits in the charging bit sequence. The preprocessing includes adjustment of amplitude and/or phase, as described in particular in example one below.

Optionally, the charging bit sequence is any one of the following: a sequence of all 1's elements, a sequence of all 0's elements, or a random binary sequence.

Optionally, the length of the charging bit sequence is l×m. l is a positive integer. For example, l is an integer greater than or equal to 1. l may represent the number of charge bits corresponding to one charge symbol. For example, the transmitting end may obtain a charging bit sequence with a length of lxm in advance, and then perform serial-parallel conversion on the charging bit sequence, where each l charging bits corresponds to one charging subcarrier. Then, the transmitting end modulates each l of the charge bits to obtain a charge symbol, or modulates each l of the charge bits and then pretreats the modulated charge bits to obtain a charge symbol, so that M charge symbols can be obtained according to a charge bit sequence with the length of l×M.

When the charge bit sequence is the full 1 sequence or the full 0 sequence, the symbol (i.e. X _i,k ) The same applies, so that more energy can be made to be higher than the switching voltage of the rectifier, thereby improving the charging efficiency.

With reference to the first or second aspect, in one possible implementation manner, the charging symbol carried on the charging subcarrier is a charging time domain symbol obtained by performing fast fourier transform. Or the charging symbol carried on the charging subcarrier is obtained by performing fast Fourier transform on a charging time domain symbol and then performing pretreatment. The preprocessing includes adjustment of amplitude and/or phase, as described in particular in example one below. The charging time domain symbol may be obtained by sampling and amplitude shift keying (amplitude shift keying, ASK) modulation of a predefined charging waveform. The number of sampling points of the sampling is M.

Optionally, the predefined charging waveform includes one or more of: noise signals, chaotic signals, triangular waves, pulsed waves, or multitone signals.

For example, the transmitting end may select a predefined charging waveform according to needs, and then sample the selected charging waveform to obtain a discrete sampling sequence with a length of M; wherein the sampling frequency is f _s The number of sampling points is equal to M. Then, the transmitting end may perform ASK modulation on the discrete sampling sequence to obtain M charging time domain symbols. The transmitting end can perform fast Fourier transform (fast fourier transform, FFT) on the discrete M time-domain symbols to obtain M frequency-domain symbols, which are marked as S [ k ]]. The transmitting end can sequentially modulate the M frequency domain symbols onto the M charge sub-carriers, namely, complete the secondary S [ k ] according to the indexes of the M charge sub-carriers]To charge sign X _i,k Is a one-to-one mapping of (a) to (b). The transmitting end may also pre-process the M frequency domain symbols and then modulate the M frequency domain symbols onto the M charging subcarriers.

The application can embed the predefined arbitrary waveform into the OFDM symbol, and can realize interference-free embedding without additional frequency domain guard bands. In addition, the application can support richer waveforms, can design different charging waveforms for different rectifiers to ensure one-to-one matching, and can design better charging waveforms for each rectifier to realize higher-efficiency charging.

With reference to the first or second aspect, in one possible implementation manner, in a case where the transmitting end sends the multiple OFDM symbols separately, a part of OFDM symbols in the multiple OFDM symbols may be processed by the first power amplifier and then sent simultaneously with another part of OFDM symbols in the multiple OFDM symbols after being processed by the second power amplifier, that is, occur at the same time, for example, occupy the same symbol in the same slot. The first power amplifier and the second power amplifier are different.

Since data transmission needs to ensure that a signal is transmitted without distortion, a Power Amplifier (PA) typically used to amplify a data signal is a linear PA and power backoff is performed according to a peak-to-average power ratio (PAPR) of the data signal. While energy transmission does not require demodulation, a nonlinear PA or a linear PA that does not perform power backoff may be employed to amplify the signal. Thus, the first and second power amplifiers may be one linear PA with power backoff and the other non-linear PA or linear PA without power backoff. This reduces distortion of the data signal and also allows for a higher PAPR for the charging signal.

Of course, when the transmitting end stacks the plurality of OFDM symbols into one OFDM symbol for transmission, a part of OFDM symbols in the plurality of OFDM symbols and another part of OFDM symbols may be amplified by different power amplifiers, and then the OFDM symbols amplified by the different power amplifiers are stacked and transmitted.

With reference to the first or second aspect, in one possible implementation manner, K data subcarriers in the N subcarriers may be predefined, or preconfigured, or agreed in advance by both transceivers, or the like, and the present application is not limited.

In a third aspect, the present application provides a signal processing method, which can be applied to a receiving end that needs to perform data demodulation, such as a receiving end that only performs data demodulation, and a receiving end that needs to perform both data demodulation and energy collection. The method comprises the following steps: the method comprises the steps that a receiving end receives one or more OFDM symbols, the one or more OFDM symbols are borne on the same resource block, the same resource block comprises N subcarriers, the N subcarriers comprise M charging subcarriers and K data subcarriers, the intersection of the M charging subcarriers and the K data subcarriers is an empty set, one charging subcarrier carries one or more charging symbols, and one data subcarrier is used for carrying one data symbol; the transmitting end demodulates the K data subcarriers. Wherein N, M, K are all positive integers.

Illustratively, since the receiving end knows the index of the data subcarriers (which may be predefined, or preconfigured, or agreed in advance by both parties), the receiving end can find K data subcarriers from the above N subcarriers. The receiving end may then demodulate the K data subcarriers to obtain data information (e.g., a data bit sequence) carried on the K data subcarriers.

The receiving end may be a User Equipment (UE), for example.

It can be understood that, whether the transmitting end transmits one OFDM symbol or multiple OFDM symbols at the same time, since the multiple OFDM symbols overlapped in time domain may be overlapped in the air, the data symbol and the charging symbol exist in the signal received by the receiving end at the same time, and the signal received by the receiving end includes the information of the multiple OFDM symbols overlapped in time domain.

It can be understood that, for the receiving end that needs to collect energy, the receiving end can convert the aerial electromagnetic wave into an alternating current signal through the antenna of the receiver and enter the rectifier of the receiving end, the rectifier rectifies and filters the alternating current signal into a direct current signal and sends the direct current signal to the power management module of the receiving end, and finally the power management module sends the direct current signal to the battery to realize energy storage.

Therefore, the application not only can collect radio frequency energy at the receiving end, but also can demodulate data to obtain data information, thereby realizing coexistence of wireless energy transmission and data transmission, reducing influence of wireless energy transmission on data transmission and laying foundation for realizing wireless energy transmission through the base station.

In a fourth aspect, the present application provides a communication device, which may be a receiving end or a chip or circuit provided in or applied to the receiving end, for performing steps or functions performed by the receiving end. The communication device includes: a processing unit and a transceiver unit. The receiving and transmitting unit is configured to receive one or more OFDM symbols, where the one or more OFDM symbols are carried on a same resource block, where the same resource block includes N subcarriers, where the N subcarriers include M charging subcarriers and K data subcarriers, an intersection of the M charging subcarriers and the K data subcarriers is an empty set, one charging subcarrier carries one or more charging symbols, and one data subcarrier is used to carry one data symbol; and the processing unit is used for demodulating the K data subcarriers. Wherein N, M, K are all positive integers.

In a fifth aspect, the present application provides a signal processing method, the method comprising: the transmitting end obtains an OFDM symbol and transmits the OFDM symbol. The OFDM symbol is carried on a resource block containing N subcarriers. The N subcarriers include M charged subcarriers and K data subcarriers. The intersection of the M charged subcarriers and the K data subcarriers is an empty set. One charging subcarrier carries one or more charging symbols and one data subcarrier is used to carry one data symbol. Wherein N, M, K are all positive integers.

The transmitting end may be a base station, for example.

For example, the transmitting end may reserve M null subcarriers in the process of generating the data symbol, and allocate a charging symbol to the M null subcarriers, where the charging symbol may be generated in advance or received from other entities. Alternatively, the transmitting end may reserve K null sub-carriers in the process of generating the charging symbol, and carry data symbols on the K null sub-carriers, where the data symbols may be generated in advance or received from other entities. The transmitting end may then generate one OFDM symbol from the M charging symbols and the K data symbols through IFFT. The transmitting end can process the OFDM symbol through parallel-serial conversion, windowing, adding CP, etc., then amplify the OFDM symbol through a Power Amplifier (PA), and finally transmit the OFDM symbol through a radio frequency unit (such as an antenna).

Therefore, the application can complete the acquisition and the transmission of the OFDM symbol under the condition of one set of hardware (such as one set of signal processing unit and one power amplifier), and can save the cost.

In a sixth aspect, the present application provides a communication device, which may be a transmitting end or a chip or a circuit applied in the transmitting end, for performing steps or functions performed by the transmitting end. The communication device includes: a processing unit and a transceiver unit. Wherein, the processing unit is used for obtaining an OFDM symbol; a transceiver unit for transmitting the OFDM symbol. The OFDM symbol is carried on a resource block containing N subcarriers. The N subcarriers include M charged subcarriers and K data subcarriers. The intersection of the M charged subcarriers and the K data subcarriers is an empty set. One charging subcarrier carries one or more charging symbols and one data subcarrier is used to carry one data symbol. Wherein N, M, K are all positive integers.

With reference to the fifth or sixth aspect, in one possible implementation manner, the OFDM symbols are carried on the same resource, and the same resource block includes N subcarriers, where the N subcarriers include M charging subcarriers and K data subcarriers, which may be understood as: part of the information (e.g., data symbols) of this OFDM symbol is carried on K data subcarriers, and the other part of the information (e.g., charging symbols) is carried on M charging subcarriers.

With reference to the fifth or sixth aspect, in a possible implementation manner, the OFDM symbols may include data symbols and charging symbols, and optionally further includes pilot symbols. The difference between the pilot symbols and the charging symbols can be seen from the foregoing or the description of the first embodiment, which is not repeated here.

With reference to the fifth or sixth aspect, in a possible implementation manner, a charging symbol carried on the charging subcarrier is a predefined symbol. Or the charging symbol carried on the charging subcarrier is obtained by preprocessing a predefined symbol. The preprocessing includes adjustment of amplitude and/or phase, as described in particular in example one below.

Optionally, the predefined symbol satisfies one or more of:

wherein the phase of each predefined symbol +.>The same and a predefined value;

wherein the phase of each predefined symbol +.>Respectively predefined values;

With reference to the fifth or sixth aspect, in one possible implementation manner, the charging symbol carried on the charging subcarrier is a charging bit in the charging bit sequence obtained after modulation. Or the charging symbol carried on the charging subcarrier is obtained by modulating and preprocessing the charging bits in the charging bit sequence. The preprocessing includes adjustment of amplitude and/or phase, as described in particular in example one below.

Optionally, the length of the charging bit sequence is l×m. l is a positive integer. For example, l is an integer greater than or equal to 1. l may represent the number of charge bits corresponding to one charge symbol.

For example, the transmitting end may obtain a charging bit sequence with a length of lxm in advance, and then perform serial-parallel conversion on the charging bit sequence, where each l charging bits corresponds to one charging subcarrier. Then, the transmitting end modulates each l of the charge bits to obtain a charge symbol, or modulates each l of the charge bits and then pretreats the modulated charge bits to obtain a charge symbol, so that M charge symbols can be obtained according to a charge bit sequence with the length of l×M.

With reference to the fifth or sixth aspect, in one possible implementation manner, the charging symbol carried on the charging subcarrier is a charging time domain symbol obtained by performing fast fourier transform. Or the charging symbol carried on the charging subcarrier is obtained by performing fast Fourier transform on a charging time domain symbol and then performing pretreatment. The preprocessing includes adjustment of amplitude and/or phase, as described in particular in example one below. The charging time domain symbol may be obtained by sampling and Amplitude Shift Keying (ASK) modulation of a predefined charging waveform. The number of sampling points of the sampling is M.

For example, the transmitting end may select a predefined charging waveform according to needs, and then sample the selected charging waveform to obtain a discrete sampling sequence with a length of M; wherein the sampling frequency is f _s The number of sampling points is equal to M. Then, the transmitting end may perform ASK modulation on the discrete sampling sequence to obtain M charging time domain symbols. The transmitting end can perform FFT on the discrete M time-domain symbols to obtain M frequency-domain symbols, which are marked as S [ k ] ]. The transmitting end can sequentially modulate the M frequency domain symbols onto the M charge sub-carriers, namely, complete the secondary S [ k ] according to the indexes of the M charge sub-carriers]To charge sign X _i,k Is a one-to-one mapping of (a) to (b). The transmitting end may also pre-process the M frequency domain symbols and then modulate the M frequency domain symbols onto the M charging subcarriers.

With reference to the fifth or sixth aspect, in one possible implementation manner, K data subcarriers in the N subcarriers may be predefined, or preconfigured, or agreed in advance by both transceivers, or the like, and the present application is not limited.

In a seventh aspect, the present application provides a signal processing method, which can be applied to a receiving end that needs to perform data demodulation, such as a receiving end that only performs data demodulation, and a receiving end that needs to perform both data demodulation and energy collection. The method comprises the following steps: the receiving end receives an OFDM symbol, the OFDM symbol is borne on a resource block, the resource block comprises N subcarriers, the N subcarriers comprise M energy charging subcarriers and K data subcarriers, the intersection of the M energy charging subcarriers and the K data subcarriers is an empty set, the energy charging subcarriers carry energy charging symbols, and the data subcarriers are used for carrying data symbols; the receiving end demodulates the K data subcarriers. Wherein N, M, K are all positive integers.

Illustratively, the receiving end may be a UE.

In an eighth aspect, the present application provides a communication device, which may be a receiving end or a chip or a circuit provided in or applied to the receiving end, for performing steps or functions performed by the receiving end. The communication device includes: a processing unit and a transceiver unit. The receiving and transmitting unit is used for receiving an OFDM symbol, the OFDM symbol is borne on a resource block, the resource block comprises the N subcarriers, the N subcarriers comprise M energy charging subcarriers and K data subcarriers, the intersection of the M energy charging subcarriers and the K data subcarriers is an empty set, the energy charging subcarriers carry energy charging symbols, and the data subcarriers are used for carrying data symbols; and the processing unit is used for demodulating the K data subcarriers. Wherein N, M, K are all positive integers.

In a ninth aspect, the present application provides a signal processing method, the method comprising: the transmitting terminal obtains the data sub-signal and the charge sub-signal, and the transmitting terminal transmits a signal containing the charge sub-signal and the data sub-signal. The data sub-signal includes OFDM symbols carried on resource blocks. This resource block includes M consecutive subcarriers and K data subcarriers. The M consecutive subcarriers are not intersected by the K data subcarriers. The K data subcarriers carry data symbols, and the M consecutive subcarriers are used to carry the charging sub-signals. The frequency range of the M consecutive subcarriers includes the frequency range of the charging sub-signal. Wherein M and K are positive integers.

The transmitting end may be a base station, for example.

Because the frequency ranges occupied by the energy charging sub-signal and the data sub-signal are not overlapped, the application can realize coexistence of wireless energy transmission and data transmission and reduce the influence of the wireless energy transmission on the data transmission.

It will be appreciated that the data symbols on the K data subcarriers may be subjected to IFFT to obtain an OFDM symbol, where the OFDM symbol or the waveform of the OFDM symbol is a data sub-signal.

In a tenth aspect, the present application provides a communication device, which may be a transmitting terminal or a chip or a circuit provided in the transmitting terminal, for performing steps or functions performed by the transmitting terminal. The communication device includes: a processing unit and a transceiver unit. The processing unit is used for obtaining the data sub-signal and the charging sub-signal; and the receiving and transmitting unit is used for transmitting signals containing the charging sub-signals and the data sub-signals. The data sub-signal includes OFDM symbols carried on resource blocks. This resource block includes M consecutive subcarriers and K data subcarriers. The M consecutive subcarriers are not intersected by the K data subcarriers. The K data subcarriers carry data symbols, and the M consecutive subcarriers are used to carry the charging sub-signals. The frequency range of the M consecutive subcarriers includes the frequency range of the charging sub-signal. Wherein M and K are positive integers.

With reference to the ninth or tenth aspect, in one possible implementation manner, the charging sub-signal is obtained after preprocessing a charging symbol sequence. Wherein the preprocessing includes limiting the frequency spectrum of the sequence of charged symbols to a certain range, e.g., the preprocessing is windowing. The charging symbol sequence is obtained by sampling and time-domain ASK modulation of a predefined charging waveform, wherein the sampling point number of the sampling is N. N may be equal to the number of subcarriers occupied by one OFDM symbol in the data sub-signal.

For example, the transmitting end may select a predefined charging waveform according to needs, and sample the selected charging waveform to obtain a discrete sampling sequence with a length of N. The transmitting end can perform time domain ASK modulation on the discrete sampling sequence to obtain a charging symbol sequence. Then, the transmitting end can window the charging symbol sequence, namely, the point multiplication window function of the charging symbol sequence, so as to obtain a charging sub-signal.

It will be appreciated that the purpose of windowing is to limit the frequency of the sequence of charging symbols to a range that is related to the spectral width allocated for use by charging in the transmission bandwidth (bandwidth). That is, the frequency width of the window is determined based on the product of M and the subcarrier spacing Δf. For example, if there is no guard band between the charging sub-signal and the data sub-signal, or the M consecutive sub-carriers include guard sub-carriers, the frequency width of the window may be less than or equal to mxΔf. If a guard band is present between the charge sub-signal and the data sub-signal and the guard band has a width of ΔxΔf, the frequency width of the window may be less than or equal to (m+Δ) ×Δf. Where Δ represents the number of guard subcarriers.

It can be understood that the above-mentioned charge sub-signal is obtained in the time domain, and the frequency of the obtained charge sub-signal is within a certain range by windowing the charge symbol sequence, so that the interference of the charge sub-signal and the data sub-signal in the frequency domain can be reduced.

The application can embed the predefined arbitrary waveform into the OFDM symbol, such as the OFDM symbol of 5G NR, by windowing the time domain of the charging symbol sequence, and does not generate interference to the data sub-signal, thereby realizing the coexistence of wireless energy transmission and data transmission. If the application embeds the predefined multitone waveform into the OFDM symbol, the energy charging efficiency can be improved. In addition, the application can support richer waveforms, can design different charging waveforms for different rectifiers to ensure one-to-one matching, and can design better charging waveforms for each rectifier to realize higher-efficiency charging.

With reference to the ninth or tenth aspect, in one possible implementation manner, the resource block further includes Δ guard subcarriers, that is, the M consecutive subcarriers do not include guard subcarriers, or the M consecutive subcarriers may be all used to carry charging sub-signals. The delta guard subcarriers may be used to separate the M consecutive subcarriers from the data subcarriers.

With reference to the ninth or tenth aspect, in one possible implementation manner, the M consecutive subcarriers include Δ guard subcarriers, that is, other subcarriers except the Δ guard subcarriers in the M consecutive subcarriers may be used to carry charging sub-signals. The delta guard subcarriers may be used to separate the subcarriers carrying the charging subcarriers from the subcarriers carrying the data subcarriers.

The application can further reduce the interference of the charge sub-signal to the data sub-signal by reserving the frequency domain guard band (namely delta guard sub-carriers) in the generation process of the data sub-signal.

With reference to the ninth or tenth aspect, in one possible implementation manner, the K data subcarriers may be predefined, or preconfigured, or agreed in advance by both parties, or the like, and the present application is not limited.

In an eleventh aspect, the present application provides a signal processing method, which can be applied to a receiving end that needs to perform data demodulation, such as a receiving end that only performs data demodulation, and a receiving end that needs to perform both data demodulation and energy collection. The method comprises the following steps: the receiving end receives a signal, the signal comprises a charging sub-signal and a data sub-signal, and the receiving end demodulates the data sub-signal in the signal. The data sub-signal includes OFDM symbols carried on resource blocks. The resource block includes M consecutive subcarriers and K data subcarriers, the M consecutive subcarriers having no intersection with the K data subcarriers. The K data subcarriers carry data symbols, and the M consecutive subcarriers are used to carry charging sub-signals. The frequency range of the M consecutive subcarriers includes the frequency range of the charging sub-signal. Wherein M and K are positive integers.

Illustratively, the receiving end may be a UE.

Illustratively, since the receiving end knows the index of the data subcarriers (which may be predefined, or preconfigured, or agreed in advance by both transceivers), the receiving end can determine the data subcarriers carried by the K data subcarriers from the received signal. The receiving end may then demodulate the data sub-signal to obtain data information (e.g., a sequence of data bits) carried in the data sub-signal.

In a twelfth aspect, the present application provides a communication device, which may be a receiving end or a chip or a circuit applied in the receiving end, for performing steps or functions performed by the receiving end. The communication device includes: a processing unit and a transceiver unit. The receiving and transmitting unit is used for receiving signals, and the signals comprise charging sub-signals and data sub-signals; and the processing unit is used for demodulating the data sub-signals in the signal. The data sub-signal includes OFDM symbols carried on resource blocks. The resource block includes M consecutive subcarriers and K data subcarriers, the M consecutive subcarriers having no intersection with the K data subcarriers. The K data subcarriers carry data symbols, and the M consecutive subcarriers are used to carry charging sub-signals. The frequency range of the M consecutive subcarriers includes the frequency range of the charging sub-signal. Wherein M and K are positive integers.

In a thirteenth aspect, the present application provides a signal processing method, the method comprising: the transmitting end obtains one or more (time domain) OFDM symbols and transmits one or more OFDM symbols, where the one or more OFDM symbols are carried on a same resource block, where the same resource block includes N subcarriers, where the N subcarriers include at least one common subcarrier, and where the common subcarrier carries a charging symbol and a data symbol. Wherein N is a positive integer. The transmitting end may be a base station, for example. It will be appreciated that a plurality of OFDM symbols are carried on the same resource block, meaning that the plurality of OFDM symbols coincide in both the time and frequency domains.

Further, the transmitting end retransmits auxiliary demodulation information, where the auxiliary demodulation information is used to indicate one or more of the following: an index of the at least one common subcarrier, or a charging symbol carried by the at least one common subcarrier. Optionally, the item not indicated by the auxiliary demodulation information in one or more of the foregoing items is predefined or obtained through other approaches, which is not limited herein.

Illustratively, a transmitting end obtains a plurality of OFDM symbols and transmits the plurality of OFDM symbols, respectively. Or the transmitting end obtains a plurality of OFDM symbols and stacks the OFDM symbols into one OFDM symbol for transmission.

Further exemplary, the transmitting end obtains one OFDM symbol and transmits the OFDM symbol.

The application can improve the resource utilization rate by carrying the charging symbol and the data symbol on one subcarrier at the same time. Because the charging symbols are interference to the data symbols on the shared subcarriers, in order for the receiving end to successfully complete data demodulation, the transmitting end of the present application also transmits auxiliary demodulation information to help the receiving end to demodulate the data, thereby realizing coexistence of wireless energy transmission and another form of data transmission.

It will be appreciated that, before the transmitting end transmits an OFDM symbol, one or more OFDM symbols to be transmitted may be transmitted after a series of processing, such as one or more of parallel-to-serial conversion, windowing, cyclic Prefix (CP) adding, or power amplification.

With reference to the thirteenth aspect, in a possible implementation manner, the method further includes: the transmitting end transmits mode information indicating whether or not a common subcarrier exists among the N subcarriers.

In a fourteenth aspect, the present application provides a communication apparatus, which may be a transmitting end or a chip or a circuit applied in the transmitting end, for performing steps or functions performed by the transmitting end. The communication device includes: a processing unit and a transceiver unit. Wherein the processing unit obtains one or more (time domain) OFDM symbols; and a transceiver unit, configured to send one or more OFDM symbols, where the one or more OFDM symbols are carried on a same resource block, where the same resource block includes N subcarriers, and the N subcarriers include at least one common subcarrier, and the common subcarrier carries a charging symbol and a data symbol. Wherein N is a positive integer. It will be appreciated that a plurality of OFDM symbols are carried on the same resource block, meaning that the plurality of OFDM symbols coincide in both the time and frequency domains.

Further, the transceiver unit is further configured to send auxiliary demodulation information, where the auxiliary demodulation information is used to indicate one or more of the following: an index of the at least one common subcarrier, or a charging symbol carried by the at least one common subcarrier.

With reference to the fourteenth aspect, in one possible implementation manner, the transceiver unit is further configured to send mode information, where the mode information is used to indicate whether a common subcarrier exists in the N subcarriers.

With reference to the thirteenth or fourteenth aspect, in one possible implementation manner, M subcarriers are allocated to the charging use, K subcarriers are allocated to the data transmission use, and the subcarriers used for charging and the subcarriers used for data transmission have an intersection. The subcarriers in the intersection are also referred to as shared subcarriers.

With reference to the thirteenth or fourteenth aspect, in a possible implementation manner, the charging symbol is a predefined symbol. Or the charging symbol is obtained by preprocessing a predefined symbol. The preprocessing includes adjustment of amplitude and/or phase, as described in particular in example one below.

Optionally, the predefined symbol satisfies one or more of:

Wherein the phase of each predefined symbol +.>The same and a predefined value;

wherein the phase of each predefined symbol +.>Respectively predefined values;

With reference to the thirteenth or fourteenth aspect, in one possible implementation manner, the charging symbol is a charging bit in a charging bit sequence obtained after modulation. Or the charging symbol is obtained by modulating and preprocessing charging bits in the charging bit sequence. The preprocessing includes adjustment of amplitude and/or phase, as described in particular in example one below.

With reference to the thirteenth or fourteenth aspect, in one possible implementation manner, the charging symbol is a charging time domain symbol obtained by performing fast fourier transform. Or the energy charging symbol is obtained by performing fast Fourier transform on the energy charging time domain symbol and then performing pretreatment. The preprocessing includes adjustment of amplitude and/or phase, as described in particular in example one below. The charging time domain symbol may be obtained by sampling and ASK modulating a predefined charging waveform. The number of sampling points of the sampling is M.

For example, the transmitting end may select a predefined charging waveform according to needs, and then sample the selected charging waveform to obtain a discrete sampling sequence with a length of M; wherein the sampling frequency is f _s The number of sampling points is equal to M. The transmitting end may then perform the discrete sampling sequenceASK modulation is carried out to obtain M charging time domain symbols. The transmitting end can perform FFT on the discrete M time-domain symbols to obtain M frequency-domain symbols, which are marked as S [ k ]]. The transmitting end can sequentially modulate the M frequency domain symbols onto the M charge sub-carriers, namely, complete the secondary S [ k ] according to the indexes of the M charge sub-carriers]To charge sign X _i,k Is a one-to-one mapping of (a) to (b). The transmitting end may also pre-process the M frequency domain symbols and then modulate the M frequency domain symbols onto the M charging subcarriers.

With reference to the thirteenth or fourteenth aspect, in one possible implementation manner, K data subcarriers in the N subcarriers may be predefined, or preconfigured, or agreed in advance by both transceivers, or the like, and the present application is not limited.

In a fifteenth aspect, the present application provides a signal processing method that can be applied to a receiving terminal that needs to perform data demodulation, such as a receiving terminal that only performs data demodulation, and a receiving terminal that needs to perform both data demodulation and energy collection. The method comprises the following steps: the method comprises the steps that a receiving end receives one or more OFDM symbols, the one or more OFDM symbols are borne on the same resource block, the same resource block comprises N subcarriers, the N subcarriers comprise at least one shared subcarrier, and the shared subcarrier carries a charging symbol and a data symbol; the receiving end receives auxiliary demodulation information, wherein the auxiliary demodulation information is used for indicating one or more of the following: an index of the at least one common subcarrier, or a charging symbol carried by the at least one common subcarrier; the receiving end demodulates the one or more OFDM symbols according to the auxiliary demodulation information. Wherein N is a positive integer. Optionally, the item not indicated by the auxiliary demodulation information in one or more of the foregoing items is predefined or obtained through other approaches, which is not limited herein.

Illustratively, since the receiving end knows the indexes of the data subcarriers (which may be predefined, or preconfigured, or agreed in advance by both transmitting and receiving parties), and knows which indexes are indexes of the common subcarriers and the charging symbols on the common subcarriers through the received auxiliary demodulation information. Therefore, the receiving end can perform interference elimination on the shared sub-carrier according to the auxiliary demodulation information and then perform demodulation on the data symbol, and can directly perform demodulation on other data sub-carriers except the shared sub-carrier without interference elimination.

Illustratively, the receiving end may be a UE.

The receiving end of the application carries out interference elimination on the shared sub-carrier according to the auxiliary demodulation information, thereby reducing the interference of the charging symbol on the shared sub-carrier to the data symbol, enabling the data symbol to be correctly demodulated, reducing the influence of wireless energy transmission on the data transmission, and laying a foundation for realizing the wireless energy transmission through the base station.

With reference to the fifteenth aspect, in a possible implementation manner, the method further includes: the receiving end receives mode information, and the mode information is used for indicating whether a shared subcarrier exists in the N subcarriers.

In a sixteenth aspect, the present application provides a communication device, which may be a receiving end or a chip or a circuit applied in the receiving end, for performing steps or functions performed by the receiving end. The communication device includes: a processing unit and a transceiver unit. The receiving and transmitting unit is used for receiving one or more OFDM symbols, the one or more OFDM symbols are borne on the same resource block, the same resource block comprises N subcarriers, the N subcarriers comprise at least one shared subcarrier, and the shared subcarrier carries a charging symbol and a data symbol; a transceiver unit, configured to receive auxiliary demodulation information, where the auxiliary demodulation information is used to indicate one or more of the following: an index of the at least one common subcarrier, or a charging symbol carried by the at least one common subcarrier; a processing unit for demodulating the one or more OFDM symbols according to the auxiliary demodulation information. Wherein N is a positive integer.

With reference to the sixteenth aspect, in one possible implementation manner, the transceiver unit is further configured to receive mode information, where the mode information is used to indicate whether a common subcarrier exists in the N subcarriers.

In a seventeenth aspect, the present application provides a communication device that may include a processor, and a memory. Further, the communication device may further include a communication circuit. Wherein the memory is for storing a computer program, the communication circuit being for transceiving various information, the computer program comprising program instructions which, when executed by the processor, cause the communication device to perform the method described by any one of the possible implementations of the first aspect, or the third aspect, or the fifth aspect, or the seventh aspect, or the ninth aspect, or the eleventh aspect, the thirteenth aspect, the fifteenth aspect, or any one of the aspects. The communication circuit may include a transceiver, which may be a radio frequency module in the communication device, or a combination of a radio frequency module and an antenna, or the communication circuit may include an input-output interface of a chip or a circuit.

In an eighteenth aspect, the present application provides a readable storage medium having stored thereon program instructions which, when run on a computer, cause the computer to perform the method described in the first aspect, or the third aspect, or the fifth aspect, or the seventh aspect, or the ninth aspect, or the eleventh aspect, the thirteenth aspect, the fifteenth aspect, or any one of the possible implementation manners of any one of the above aspects.

In a nineteenth aspect, the present application provides a program product comprising program instructions which, when run, cause the method described in the first aspect, or the third aspect, or the fifth aspect, or the seventh aspect, or the ninth aspect, or the eleventh aspect, the thirteenth aspect, the fifteenth aspect, or any one of the possible implementations of any one of the aspects to be performed.

In a twentieth aspect, the present application provides an apparatus, which may be implemented in the form of a chip or as a device, comprising a processor. The processor is configured to read and execute a program stored in the memory to perform the signal processing method provided by one or more of the first aspect, or the third aspect, or the fifth aspect, or the seventh aspect, or the ninth aspect, or one or more of the eleventh aspect, the thirteenth aspect, the fifteenth aspect, or any one of the possible implementation manners of any one of the aspects. Optionally, the apparatus further comprises a memory, the memory being electrically connected to the processor. Further optionally, the apparatus further comprises a communication interface, and the processor is connected to the communication interface. The communication interface is used for receiving the data packet and/or information to be processed, the processor acquires the data packet and/or information from the communication interface, processes the data packet and/or information, and outputs a processing result through the communication interface. The communication interface may be an input-output interface.

In the alternative, the processor and the memory may be physically separate units, or the memory may be integrated with the processor.

In a twenty-first aspect, the present application provides a communication system, including a transmitting end and a receiving end; the transmitting end is configured to perform a method described in the first aspect, or the fifth aspect, or the ninth aspect, or the thirteenth aspect, or any one of the possible implementation manners of any one of the foregoing aspects, and the receiving end is configured to perform a method described in the third aspect, or the seventh aspect, or the eleventh aspect, or the fifteenth aspect, or any one of the possible implementation manners of any one of the foregoing aspects.

The technical effects achieved in the above aspects may be referred to each other or the advantages of the method embodiments shown below, which are not described herein.

Drawings

Fig. 1 is a simplified schematic diagram of a wireless communication system provided by an embodiment of the present application;

fig. 2 is a schematic diagram of an application scenario provided in an embodiment of the present application;

FIG. 3 is a schematic diagram of the collection of RF energy provided by an embodiment of the present application;

fig. 4 is a schematic flow chart of a first signal processing method according to an embodiment of the present application;

Fig. 5a is a schematic diagram of a first signal processing flow provided in an embodiment of the present application;

fig. 5b is a schematic diagram of a second signal processing flow provided in an embodiment of the present application;

fig. 5c is a schematic diagram of a third signal processing flow provided in an embodiment of the present application;

fig. 6a is a schematic diagram of a fourth signal processing flow provided in an embodiment of the present application;

fig. 6b is a schematic diagram of a fifth signal processing flow provided in an embodiment of the present application;

fig. 7a is a schematic diagram of a sixth signal processing flow provided in an embodiment of the present application;

fig. 7b is a schematic diagram of a seventh signal processing flow provided in an embodiment of the present application;

fig. 8 is a second flowchart of a signal processing method according to an embodiment of the present application;

fig. 9 is a schematic diagram of an eighth signal processing flow provided in an embodiment of the present application;

fig. 10 is a schematic diagram of a third flow of a signal processing method according to an embodiment of the present application;

FIG. 11 is a schematic diagram of a frequency band distribution of a data sub-signal and a charging sub-signal according to an embodiment of the present application;

fig. 12 is a schematic diagram of a ninth signal processing flow provided in an embodiment of the present application;

fig. 13 is a fourth flowchart of a signal processing method according to an embodiment of the present application;

fig. 14a is a schematic diagram of a tenth signal processing flow provided in an embodiment of the present application;

Fig. 14b is a schematic diagram of an eleventh signal processing flow provided in an embodiment of the present application;

fig. 15 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 16 is another schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 17 is a schematic diagram of still another structure of a communication device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application.

In the description of the present application, the words "first", "second", etc. are used only to distinguish different objects, and are not limited to numbers and execution orders, and the words "first", "second", etc. are not necessarily different. Furthermore, the terms "comprising," "including," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion. Such as a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to the list of steps or elements but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In the description of the present application, "/" means "or" unless otherwise indicated, for example, A/B may mean A or B. "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. Furthermore, "at least one (item)", "next item(s)" or plural item(s) "or the like means any combination of these items, including any combination of single item(s) or plural item(s). For example, at least one (one) of a, b, or c may represent: a, b, c; a and b; a and c; b and c; or a and b and c. Wherein a, b and c can be single or multiple.

In the description of the present application, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary," "by way of example," or "such as" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary," "by way of example," or "such as" is intended to present related concepts in a concrete fashion.

It will be understood that in the description of the application, the terms "when …", "if" and "if" are used to indicate that the device is doing so under some objective condition, and are not intended to limit the time and require no judgment in the implementation of the device, nor are other limitations meant to be implied.

The term "simultaneously" in the present application is understood to mean at the same point in time, also during a period of time, and also during the same period, in particular in combination with the context.

Elements referred to in the singular are intended to be used in the present disclosure as "one or more" rather than "one and only one" unless specifically stated otherwise.

In addition, the terms "system" and "network" are often used interchangeably herein.

It will be appreciated that in embodiments of the present application, "B corresponding to A" means that B is associated with A, or B may be determined from A. It should also be understood that determining B from a does not mean determining B from a alone, but may also determine B from a and/or other information.

The technical scheme of the embodiment of the application can be applied to various communication systems, such as: long Term Evolution (LTE) systems, worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX) communication systems, fifth generation (5th Generation,5G) systems, such as new generation radio access technology (new radio access technology, NR), networks where multiple systems merge, internet of things systems, open-radio access network (O-RAN) systems, and future communication systems, such as 6G systems, etc.

The communication system comprises communication equipment, and the communication equipment can utilize air interface resources to carry out wireless communication. The communication device may include a network device, which may also be referred to as a base station device, and a terminal device. The air interface resources may include at least one of time domain resources, frequency domain resources, code resources, and space resources. In the present application, at least one may also be described as one or more, and a plurality may be two, three, four or more, and the present application is not limited thereto.

It should be understood that, the network architecture and the application scenario described in the embodiments of the present application are for more clearly describing the technical solution of the embodiments of the present application, and are not limited to the technical solution provided in the embodiments of the present application, and those skilled in the art can know that, along with the evolution of the network architecture, the technical solution provided in the embodiments of the present application is equally applicable to similar technical problems.

Referring to fig. 1, fig. 1 is a simplified schematic diagram of a wireless communication system according to an embodiment of the present application. As shown in fig. 1, the wireless communication system includes a radio access network 100. The radio access network 100 may be a next generation (e.g., 6G or higher version) radio access network, or a legacy (e.g., 5G, 4G, 3G, or 2G) radio access network. One or more terminal devices (120 a-120j, collectively 120) may be interconnected or connected to one or more network devices (110 a, 110b, collectively 110) in the radio access network 100. Optionally, fig. 1 is only a schematic diagram, and other devices may be further included in the wireless communication system, for example, a core network device, a wireless relay device, and/or a wireless backhaul device, which are not shown in fig. 1.

Alternatively, in practical applications, the wireless communication system may include multiple network devices (also referred to as access network devices) at the same time, or may include multiple terminal devices at the same time. One network device may serve one or more terminal devices simultaneously. One terminal device may also access one or more network devices simultaneously. The embodiment of the application does not limit the number of terminal equipment and network equipment included in the wireless communication system.

The network device may be an entity on the network side for transmitting or receiving signals, such as a Base Station (BS), and the BS may be a device deployed in the radio access network and capable of performing wireless communication with the terminal. The base station may take many forms, such as macro base station, micro base station, relay station, access point, etc. The base station according to the embodiment of the present application may be a base station in 5G or an evolved node B (eNB) in LTE, for example. Among them, the base stations in 5G may also be referred to as transmission reception points (transmission reception point, TRP) or 5G base stations (next-generation node B, gNB). The base station may also be replaced with a name such as: wireless access points, node bs (nodebs), transmitting points (transmitting point, TPs), master MeNB, secondary SeNB, multi-standard radio (MSR) nodes, home base stations, network controllers, access nodes, wireless nodes, access Points (APs), transmitting nodes, transceiving nodes, baseband units (BBUs), remote radio units (remote radio unit, RRUs), active antenna units (active antenna unit, AAUs), radio heads (remote radio head, RRHs), centralized Units (CUs), distributed Units (DUs), positioning nodes, IAB hosts (IAB donos), and the like.

The Base Station (BS) may be fixed or mobile. For example, the base stations 110a, 110b are stationary and are responsible for radio transmissions and receptions from one or more cells of the terminal device 120. The helicopter or drone 120i shown in fig. 1 may be configured to act as a mobile base station, and one or more cells may move according to the location of the mobile base station 120 i. In other examples, a helicopter or drone (120 i) may be configured to function as a terminal device in communication with base station 110 a.

The network device in the embodiment of the present application may be an integrated base station, or may be a base station including a Centralized Unit (CU) and/or a Distributed Unit (DU). The base station comprising CU and DU may also be referred to as a base station with CU and DU separated, e.g. the base station comprises gNB-CU and gNB-DU. The CU may be further separated into a CU control plane (CU-CP) and a CU user plane (CU-UP), for example, the base station includes a gNB-CU-CP, a gNB-CU-UP, and a gNB-DU. Alternatively, the network device of an embodiment of the present application may also be an antenna unit (RU). Still alternatively, the network device in the embodiment of the present application may also be an open radio access network (openradio access network, O-RAN) architecture, etc., and the specific deployment manner of the network device in the embodiment of the present application is not limited. For example, when the network device is an O-RAN architecture, the network device shown in the embodiments of the present application may be an access network device in an O-RAN, such as a CU, a DU, or a combination of one or more of RUs, or a module in an access network device, etc. In an ORAN system, a CU may also be referred to as an open (O) -CU, a CU-CP may also be referred to as an O-CU-CP, a CU-UP may also be referred to as an O-CU-UP, and an RU may also be referred to as an O-RU.

In the embodiment of the present application, the device for implementing the function of the network device may be a network device; or may be a device capable of supporting the network device to implement the function, such as a system on a chip, or a communication module, or a modem, etc., which may be installed in the network device. In the technical solution provided in the embodiment of the present application, the device for implementing the function of the network device is a network device, and the network device is a base station as an example, which describes the technical solution provided in the embodiment of the present application. The base stations may support networks of the same or different access technologies. The embodiment of the application does not limit the specific technology and the specific equipment form adopted by the network equipment.

The terminal device may be called a terminal, a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), etc., which may be a device having a wireless transceiving function; it may be deployed on land, including indoors or outdoors, hand held or vehicle mounted; can also be deployed on the water surface (such as ships, etc.); but may also be deployed in the air (e.g., on aircraft, balloon, satellite, etc.). The terminal device may be used to connect people, things and machines. The terminal device 120 may be widely used in various scenarios, such as cellular communication, device-to-device (D2D), vehicle-to-device (V2X), peer-to-peer (P2P), machine-to-machine (machine to machine, M2M), machine-type communication (machine type communication, MTC), internet of things (Internet of Things, ioT), virtual Reality (VR), augmented reality (augmented reality, AR), industrial control, autopilot, telemedicine, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city (smart home), drone, robot, remote sensing, passive sensing, positioning, navigation and tracking, autonomous delivery and movement, and the like. Terminal device 120 may be a third generation partnership project (3rd generation partnership project,3GPP) standard User Equipment (UE), stationary device, mobile device, handheld device, wearable device, cellular phone, smart phone, session initiation protocol (session initiation protocol, SIP) phone, notebook computer, personal computer, smart book, vehicle, satellite, global positioning system (global positioning system, GPS) device, object tracking device, drone, helicopter, aircraft, watercraft, remote control device, smart home device, industrial device. The terminal device may also be a communication device in a future wireless communication system.

In the embodiment of the present application, the device for implementing the function of the terminal may be the terminal; or may be a device capable of supporting the terminal to implement the function, such as a chip system, or a communication module, or a modem, etc., which may be installed in the terminal. In the embodiment of the application, the chip system can be composed of chips, and can also comprise chips and other discrete devices. In the technical solution provided in the embodiment of the present application, the device for implementing the function of the terminal is the terminal, and the terminal is the UE, which is taken as an example, to describe the technical solution provided in the embodiment of the present application. The embodiment of the application does not limit the specific technology and the specific equipment form adopted by the terminal equipment.

Alternatively, the UE may be used to act as a base station. For example, the UE may act as a scheduling entity that provides sidelink signals between UEs in V2X, D2D or P2P, etc. As shown in fig. 1, a cellular telephone 120a and a car 120b communicate with each other using side-link signals. Communication between the cellular telephone 120a and the smart home device 120d is accomplished without relaying communication signals through the base station 110 a.

Optionally, the UE may also be used to act as a relay node. For example: the UE may act as a relay device (relay) or an access backhaul integrated (integrated access and backhaul, IAB) node for providing wireless backhaul services for the terminal device.

The technical scheme provided by the embodiment of the application can be applied to wireless charging between communication devices or applied to wireless charging and wireless communication between the communication devices. Wireless charging between communication devices may include: wireless charging between the network device and the terminal, wireless charging between the network device and the network device, and wireless charging between the terminal and the terminal. In the embodiment of the present application, the term "wireless charging" may also be referred to as "charging", "energy transfer" or "charging" for short, and the term "charging" may also be described as "wireless energy transfer", "wireless charging", "wireless energy transmission", "radio frequency energy transfer", "radio frequency charging", or "radio frequency charging" for short. The term "wireless communication" may also be referred to simply as "communication," and the term "communication" may also be described as "data transmission," "information transmission," "data transmission," or "number of transmissions," etc.

The signal processing method provided by the embodiment of the application can be applied to various mobile communication scenes aiming at protocol frameworks such as LTE (long term evolution) or NR (radio resource locator). Such as multi-hop/relay (relay) transmissions between a base station and a UE, a base station and a user equipment, dual connectivity (dual connectivity, DC) or multiple connectivity of multiple base stations and user equipments, etc. Referring to fig. 2, fig. 2 is a schematic diagram of an application scenario provided in an embodiment of the present application. As shown in fig. 2, fig. 2 shows four application scenarios, which are point-to-point single connection, multi-hop single connection, dual connection, and multi-hop multi-connection, respectively. It should be understood that the signal processing method provided by the embodiment of the present application may be applied to various application scenarios shown in fig. 2. It should also be understood that fig. 2 is only exemplary, and does not limit the application scenario applicable to the present application, and a scenario in which any network side device charges other devices in the cellular network belongs to the application scenario of the embodiment of the present application. Exemplary application scenarios of embodiments of the present application include, but are not limited to: and the base station charges the UE, the base station charges the base station, the base station charges the relay node, the relay base station charges the UE, the plurality of base stations charges one UE, the plurality of base stations charges the plurality of UEs and the like to one or more other devices.

Existing rf energy harvesting (radio frequency energy harvesting) only considers passive absorption of electromagnetic wave energy in the environment and converts it into electrical energy for storage in a capacitor or rechargeable battery. Specific principles are shown in fig. 3, and fig. 3 is a schematic diagram of radio frequency energy collection according to an embodiment of the present application. As shown in fig. 3, the electromagnetic wave in the air is converted into an alternating current signal through the antenna of the receiver and enters the rectifier, the rectifier rectifies and filters the alternating current signal into a direct current signal, the direct current signal is sent to the power management module, and finally the power management module sends the direct current signal to the battery to realize energy storage.

Studies have shown that improved energy efficiency can be achieved by transmitting polyphonic (or polysyllabic) waveforms. The multitone waveform is typically a superposition of a plurality of single tone waveforms of different frequencies, the single tone (tone) waveform being a continuous sine wave sin (2pi ft) (or cosine wave cos (2pi ft)). Because a sine wave carries a frequency (i.e., f is fixed), and the frequency is also commonly referred to as a syllable (tone), a sine wave at a given frequency f is also referred to as a single tone (or monosyllabic) waveform. For example, a four-tone waveform refers to a waveform obtained by superimposing 4 single-tone waveforms of different frequencies, i.e. The octave waveform is a waveform obtained by superimposing 8 single-tone waveforms with different frequencies, namely +.>

The higher the number of syllables, the higher the peak of the generated waveform at the same transmission power. Under the condition of given rectifier starting voltage, the waveform with higher peak value can ensure that more energy is higher than the starting voltage, so that the energy is absorbed by the rectifier, and the charging efficiency is improved. That is, the characteristics of the waveform affect the charge efficiency, and the multitone waveform is a waveform that can improve the charge efficiency.

Since wireless energy transfer (WPT) through a base station is one of the important approaches to solve the problem of short battery life of IoT devices in the future, in order to enable the charging function to be normally integrated in the base station, it is necessary that the energy transfer of the base station does not affect the data transfer. The current rf energy collection scheme does not consider the problem of transmitting data and energy simultaneously at the base station. How the charging waveform co-exists with the existing data transmission waveform (i.e., orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) waveform) remains to be explored. In addition, how to design the charging waveform to improve the charging efficiency under the condition that the wireless energy transmission and the data transmission can coexist is still to be explored.

Based on this, the embodiment of the application provides a signal processing method, a signal processing device and a readable storage medium, which can realize coexistence of wireless energy transmission and data transmission (also realize coexistence of a charging waveform and a data transmission waveform) and reduce the influence of wireless energy transmission on data transmission. In addition, the embodiment of the application can also improve the energy charging efficiency, and can generate the data transmission and energy transmission coexistence waveform compatible with OFDM without changing the generation mode of the data transmission waveform.

In the embodiment of the application, the term "data transmission and energy transmission coexisting waveform" may also be referred to as "data transmission and energy transmission coexisting waveform" for short, and the term "data transmission and energy transmission coexisting waveform" may also be described as "data transmission and energy charging coexisting waveform", or "data transmission and energy transmission coexisting waveform", etc. In the present application, a "waveform" is understood to mean a "signal" in the time domain, and both are used interchangeably. For example, the charge waveform can be understood as a charge signal, and the charge waveform and the charge signal can be used interchangeably. The data transmission waveform is understood to mean a data transmission signal or a data signal, which can be used interchangeably. Similarly, the digital coexisting waveforms can be understood as digital coexisting signals or digital signals, and the three can be used interchangeably.

In the present application, the "digital coexisting signal" or "digital coexisting waveform" may be understood as a signal including both a charging symbol and a data symbol, and will not be described in detail below.

Optionally, the method provided by the application can be applied to the network equipment such as the base station shown above, and can be applied to the terminal equipment shown above. For ease of description, all embodiments of the present application are described by a transmitting end and a receiving end; however, in practical applications, the transmitting end may be a base station or a terminal, and correspondingly, the receiving end may be a terminal or a base station, for example, a small station, which is not limited in the present application. It will be understood that the transmitting end and the receiving end in the present application are relatively, and the end that transmits the signal is referred to as the transmitting end in the present application, and the end that receives the signal is referred to as the receiving end.

The technical scheme provided by the application is described in detail below.

For the purpose of clearly describing the technical solutions of the present application, the present application is illustrated by a number of embodiments, see in particular the description of the various embodiments below. In the present application, the same or similar parts between the various embodiments or implementations may be referred to each other unless specifically stated otherwise. In the embodiments of the present application, and the respective implementation/implementation methods in the embodiments, if there is no specific description and logic conflict, terms and/or descriptions between different embodiments, and between the respective implementation/implementation methods in the embodiments, may be consistent and may refer to each other, and technical features in the different embodiments, and the respective implementation/implementation methods in the embodiments, may be combined to form a new embodiment, implementation, or implementation method according to their inherent logic relationship. The embodiments of the present application described below do not limit the scope of the present application. It will be appreciated that the order of the following embodiments does not represent a degree of importance.

It should be understood that in the present application, the indication includes a direct indication (also referred to as an explicit indication) and an implicit indication. Wherein, the direct indication information A includes the information A; the implicit indication information a indicates the information a by the corresponding relation between the information a and the information B and the direct indication information B. The correspondence between the information a and the information B may be predefined, pre-stored, pre-burned, or pre-configured.

It should be understood that in the present application, information C is used for the determination of information D, including both information D being determined based on information C alone and based on information C and other information. In addition, the information C is used for determination of the information D, and a case of indirect determination is also possible, for example, the information D is determined based on the information E, and the information E is determined based on the information C.

In addition, the "network element a sends the information a to the network element B" in the embodiments of the present application may be understood that the destination end of the information a or an intermediate network element in a transmission path between the destination end is the network element B, and may include directly or indirectly sending the information to the network element B. "network element B receives information a from network element a" is understood to mean that the source of the information a or an intermediate network element in the transmission path with the source is network element a, and may include receiving information directly or indirectly from network element a. The information may be subjected to necessary processing, such as format change, etc., between the source and destination of the information transmission, but the destination can understand the valid information from the source. Similar expressions in the present application can be understood similarly, and are not repeated here.

Example 1

The first embodiment of the application mainly introduces a method for generating a digital-to-coexisting signal (or digital-to-coexisting waveform) based on OFDM and/or discrete-Fourier transform extended OFDM (discrete-Fourier-transform-spread OFDM).

Referring to fig. 4, fig. 4 is a schematic flow chart of a first signal processing method according to an embodiment of the present application. As shown in fig. 4, the signal processing method includes, but is not limited to, the following steps:

s101, the transmitting end (e.g. the base station or a part of the base station) obtains a plurality of OFDM symbols.

S102, a transmitting end (such as a base station or a part of the base station) transmits one or more OFDM symbols, wherein the one or more OFDM symbols are borne on the same resource block, the same resource block comprises N sub-carriers, the N sub-carriers comprise M charge sub-carriers and K data sub-carriers, the intersection of the M charge sub-carriers and the K data sub-carriers is an empty set, the charge sub-carriers carry charge symbols, and the data sub-carriers are used for carrying data symbols. Wherein N, M, K are all positive integers.

In the embodiments of the present application, the charging symbol may be replaced by an energy wave, and the data symbol may be replaced by data information. An OFDM symbol is a symbol that satisfies OFDM characteristics.

In embodiments of the present application, "obtaining" includes receiving from other entities, or otherwise obtaining or generating by the present entity. For example, the transmitting end may be an O-RU, which may receive all or part of the plurality of OFDM symbols from the O-DU, such as receiving data symbols, and generate charging symbols from the O-RU, or receive charging symbols and data symbols from the O-DU, or generate charging symbols and data symbols from the O-RU, which are not limited herein. For another example, the transmitting end may be a DU/O-DU or a device including a DU/O-DU, such as a device including a DU/O-DU and a RU/O-RU, or a device including a CU/O-CU and a DU/O-DU, where "transmitting" may include transmitting to a RU/O-RU or transmitting to a terminal, which is not limited herein. One or more OFDM symbols in each embodiment of the present application are described by taking the acquisition and transmission of one or more OFDM symbols at the i-th time, i.e., one time, as an example, it may be understood that the schemes described in each embodiment may be applied to the acquisition and transmission of OFDM symbols at the multiple times, the formats of the charging symbols and the subcarriers occupied by the data symbols in OFDM symbols at different times may be the same or different, for example, the charging symbols at the i-th time may occupy 2 subcarriers (No. 0 and No. 5 subcarriers), the data symbols may occupy 4 subcarriers (No. 1 to No. 4 subcarriers), the charging symbols at the i+1 time may occupy 3 subcarriers (No. 0, no. 1 and No. 5 subcarriers), the data symbols may occupy 3 subcarriers (No. 2 to No. 4 subcarriers), the charging symbols at the i+2 time may occupy 2 subcarriers (No. 1 and No. 4 subcarriers), the data symbols may occupy 4 subcarriers (No. 0, no. 2 to No. 3 and No. 5 subcarriers), etc.

In addition, the i-th time in each embodiment of the present application is the time in the time domain corresponding to the OFDM symbol, i.e. the symbol.

In the embodiments of the present application, a plurality of OFDM symbols are carried on the same resource block, that is, the plurality of OFDM symbols are overlapped in the time domain and overlapped in the frequency domain, in other words, the plurality of OFDM symbols are carried on the same plurality of Resource Elements (REs), and the plurality of REs correspond to the same symbol, such as the i-th symbol, and are continuous in the frequency domain, which is not described herein.

In one possible implementation, the transmitting end may obtain a plurality of OFDM symbols and may transmit the plurality of OFDM symbols separately. The multiple OFDM symbols may be carried on the same resource block(s), that is, the multiple OFDM symbols may be transmitted with the same resource block. In other words, the multiple OFDM symbols overlap in time domain, or are the same time instant, for example, the multiple OFDM symbols are all at the i-th time instant; on the other hand, the plurality of OFDM symbols also overlap in the frequency domain. Therefore, the plurality of OFDM symbols can be superimposed on the air to obtain a signal (i.e., a digital coexisting signal or a digital coexisting waveform) at the i-th time. It will be appreciated that since the OFDM symbol itself has a certain time length, the OFDM symbol at the i-th time in the embodiments of the present application can be understood as the i-th OFDM symbol in one radio frame or one subframe or one slot (slot). i is a positive integer. Specific signal processing flows are described below and are not described in detail herein.

In another possible implementation manner, the transmitting end may obtain a plurality of OFDM symbols, and may stack the plurality of OFDM symbols into one OFDM symbol for transmission, or into one signal (i.e., a digital coexisting signal or a digital coexisting waveform), where the signal includes one OFDM symbol. This is because a plurality of OFDM symbols obtained by the transmitting end are carried on the same resource block, so the transmitting end can superimpose the plurality of OFDM symbols into one OFDM symbol. Specific signal processing flows are described below and are not described in detail herein.

Optionally, the same resource block includes a time domain resource and a frequency domain resource, and the frequency domain resource includes N subcarriers, that is, the same resource block includes N subcarriers. Each of the plurality of OFDM symbols may occupy N subcarriers, and the subcarriers occupied by the plurality of OFDM symbols are the same. For example, when the transmitting end acquires two OFDM symbols, N subcarriers occupied by one OFDM symbol are the same as N subcarriers occupied by another OFDM symbol, or N frequency points where N subcarriers occupied by one OFDM symbol are the same as N frequency points where N subcarriers occupied by another OFDM symbol are located. In other words, the multiple OFDM symbols at the same time occupy the same group of subcarriers or subcarriers on the same group of frequency points; or the plurality of OFDM symbols are carried on N subcarriers of different frequency points. The index of the N subcarriers may be 0 to N-1 (including index 0 and index N-1), and one index may represent a subcarrier on one frequency point. Then the subcarriers with the same index among the subcarriers occupied by the plurality of OFDM symbols coincide in the frequency domain.

Alternatively, the N subcarriers may include M charging subcarriers and K data subcarriers. The intersection of the M charging subcarriers and the K data subcarriers is a null set, that is, the charging subcarriers and the data subcarriers are located on different frequency points. For example, one charging subcarrier may carry one or more charging symbols, and one data subcarrier may carry one data symbol. In the embodiment of the application, the charging symbol and the data symbol can be symbols on a frequency domain. It can be understood that, because the charging symbol and the data symbol are carried on different subcarriers in the embodiment of the application, the interference between the symbols is avoided, so the embodiment of the application can realize the coexistence of wireless energy transmission and data transmission and reduce the influence of the wireless energy transmission on the data transmission.

In the present application, the charging subcarrier may be understood as a subcarrier allocated to charging, and the data subcarrier may be understood as a subcarrier allocated to data transmission, which is not described in detail below.

Illustratively, a portion of the plurality of OFDM symbols has energy on data subcarriers of the N subcarriers and no energy on the energized subcarriers, that is, the energized subcarriers are null subcarriers (i.e., no energy) for the portion of the OFDM symbols. While the other part of the OFDM symbol has energy on the charged subcarriers of the N subcarriers and no energy on the data subcarriers, i.e. for the other part of the OFDM symbol the data subcarriers are empty subcarriers (i.e. no energy). In other words, a part of the OFDM symbols of the plurality of OFDM symbols is carried on K data subcarriers, and another part of the OFDM symbols is carried on M charging subcarriers. In yet another aspect, a portion of the plurality of OFDM symbols includes pilot symbols and data symbols, and another portion of the plurality of OFDM symbols includes charging symbols. Of course, one OFDM symbol may also include a charging symbol, a pilot symbol, and a data symbol, which are not limited by the embodiment of the present application, but are only illustrated herein. The pilot symbols are used for channel estimation to assist demodulation of the data symbols, and the energy charging symbols are used for energy transmission, and the energy transmission efficiency is improved through a specific design. It will be appreciated that the pilot symbols are known to both parties of the communication, the positions in the OFDM symbols are determined, and the sub-carriers carrying the pilot symbols are also determined, used for channel estimation. And the charging symbols do not carry data information, do not need demodulation, are unknown to the receiving end, and are variable in position among the above-mentioned multiple OFDM symbols, and are used for transmitting energy. In addition, from the frequency domain, the charging symbols in the OFDM symbols at different moments can be the same or different; from the time domain, the time domain waveform formed by the charging symbol is different from the time domain waveform formed by the pilot symbol, and the two waveforms cannot be in one-to-one correspondence with each other at the sampling point of the time domain.

Alternatively, the indexes of the K data subcarriers may be predefined, preconfigured, or agreed by the transceiver, etc., and the embodiments of the present application are not limited. The index of the K data subcarriers may be set C _i ^DATA And (3) representing. The index of the M charging subcarriers can be set C _i And (3) representing. Set C _i And set C _i ^DATA Is an empty set, i.eAnd the N subcarriers carrying the plurality of OFDM symbols include C _i ^DATA ∪C _i Where the symbol ". U" denotes a union. Exemplary, set C _i May include the index of all or part of the N subcarriers except the data subcarrier, or set C _i The index of all or part of the subcarriers except the data subcarriers and the pilot subcarriers in the N subcarriers may be included, and the embodiment of the present application does not limit the allocation policy of the charging subcarrier resources. It can also be appreciated that since the charging subcarriers do not carry data information and do not need demodulation, the transmitting end can determine the set C _i (i.e. the sender can select which sub-carriers are charging sub-carriers by itself), and there is no need to use set C _i Informing the receiving end. Of course, in order to be able to demodulate the data correctly, the transceiver needs to know the set C _i ^DATA (i.e., the data subcarriers described above).

Pre-defined or preconfigured in the present application may be understood as set, pre-defined, stored, pre-negotiated, cured, pre-fired, or the like.

Alternatively, there may be multiple implementations of the (frequency domain) charging symbol carried by the charging subcarrier. The following is a detailed description.

In one possible implementation manner, the charging symbol may be a predefined symbol, or the charging symbol is obtained by preprocessing a predefined symbol. The sender (e.g. base station or a part of base station) may be of set C _i Which modulates a given (frequency domain) charging symbol. The predefined symbol may be any one (row) of table 1 below. Table 1 shows predefined symbols corresponding to different modulation rules. The value of k in Table 1 is set C _i Index of medium-charged subcarriers (i.e., M charged subcarriers), e.g., set C _i The indexes of the medium charge subcarriers are 1,3,5 and 8, and then the values of k are k=1, k=3, k=5 and k=8 respectively. In Table 1, i represents the OFDM symbol at the i-th time, X _i,k And representing a predefined symbol corresponding to the charged subcarrier with index k in the OFDM symbol at the ith moment.

TABLE 1

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Wherein, the preprocessing may include amplitude and/or phase adjustment, and embodiments of the present application are not limited to a specific preprocessing mode. For example, assume that the channel state information (channel state information, CSI) of the subcarrier with index k is h _i,k For a predefined symbol X _i,k Pretreatment is carried out to obtain a charging sign X' _i,k Wherein X 'is' _i,k Equal to X _i,k /h _i,k . The embodiment of the application does not limit h _i,k Precision and dimension of the (c) and the like. The CSI may be obtained by using an existing obtaining method, for example, a sounding reference signal (sounding reference signal, SRS) may be sent by a terminal, and the base station measures the SRS to obtain uplink CSI; or the base station can send a downlink channel state information reference signal (channel state information reference signal, CSI-RS), and the terminal measures the downlink CSI-RS and reports precoding matrix indication (precoding matrix indication, PMI); see the prior art for specific implementations, which are not described in detail here. The embodiment of the application is not limited to obtaining h by the CSI mode _i,k For example, h may be generated by an algorithm _i,k Or a predefined template is generated h _i,k Etc.

According to the embodiment of the application, the pre-defined symbols are preprocessed and then carried on the charge sub-carrier for transmission, so that the phase and amplitude offset brought by a wireless channel can be compensated, and the conversion efficiency of wireless energy is improved.

Exemplary, as shown in Table 1 above, when the preset modulation rule is a high peak-to-average power ratio (HPAPR) modulation, each predefined symbol is the same for the OFDM symbol at the same time instant (because of the phase of each predefined symbol)Identical), is->Wherein->Typically taking zero. It will be appreciated that since each predefined symbol is identical, M sine waves can be formed after the M predefined symbols are transformed into the time domain by Inverse Fast Fourier Transform (IFFT), and the peaks of the M sine waves overlap. Therefore, the signal generated after HPAPR modulation has higher peak-to-average power ratio (PAPR), and more energy can be higher than the starting voltage of the rectifier, so that the charging efficiency is improved.

Further exemplary, as shown in Table 1 above, low peak-to-average power ratio (LPAPR) modulation features include: each predefined symbol is assigned a different phase, i.e. the phase of each predefined symbolAssignment is performed by looking up a table. The source of the phase is usually preset. Exemplary, phase->The table can be generated by ZC (Zadoff-Chu) sequence or m sequence, or can be a strategy for selecting the phase of multiplexing channel state information reference signals (channel state information reference signal, CSI-RS). The embodiment of the application does not limit the phase +. >Is a source of (a).

Also exemplary, as shown in Table 1 above, the characteristics of random peak-to-average power ratio (RPAPR) modulation include: each predefined symbol is assigned a different phase and amplitude, and these phases and amplitudes are random. Exemplary amplitude a _i,k And/or phase b _i,k Respectively satisfying uniform distribution.

In another possible implementation manner, the charging symbol may be obtained by modulating charging bits in a charging bit sequence, or the charging symbol may be obtained by modulating charging bits in the charging bit sequence and then preprocessing. The implementation of this preprocessing is referred to in the foregoing description and will not be described in detail here. For example, the transmitting end (e.g., the base station or a portion of the base station) may obtain the charging bit sequence s [ n ] in advance, which has a length of lxm. l is a positive integer, and illustratively, l may be a positive integer greater than or equal to 2. The charging bit sequence s [ n ] may be preset, for example, the charging bit sequence s [ n ] may be a sequence of all 1 elements (all 1 sequences), a sequence of all 0 elements (all 0 sequences), or a random binary sequence (for example, a sequence of half elements being 1 and half elements being 0). The transmitting end (e.g. base station or a part of base station) can perform serial-parallel conversion on the charging bit sequence s [ n ], where each charging bit corresponds to one charging subcarrier. One (frequency domain) charging symbol can be obtained after modulating the l charging bits, or one (frequency domain) charging symbol can be obtained after modulating and preprocessing the l charging bits, so that M (frequency domain) charging symbols can be obtained according to a charging bit sequence s [ n ] with the length of l×M. Here, as a possible implementation manner, a modulation manner of 5G NR may be used, for example: the charge bits may be modulated into symbols by phase shift keying (phase shift keying, PSK), quadrature amplitude modulation (quadrature amplitude modulation, QAM) or Amplitude Shift Keying (ASK).

Wherein, l corresponding to different modulation modes are different, as shown in the following table 2, table 2 shows parameter settings corresponding to different modulation modes. Since the modulation scheme shown in table 2 below is derived from 5G NR, table 2 only exemplarily shows modulation rules of binary phase shift keying (binary phase shift keying, BPSK), and modulation rules of other modulation schemes may be described with reference to the 5G NR, and will not be described here. It will be appreciated that X in Table 2 _i,k The symbol corresponding to the subcarrier with index k in the OFDM symbol at the i-th time may be represented. In some cases, if the modulation modes of the data bit and the charge bit are the same, for example, the BPSK in the following Table 2 is used for modulation, the value of k can be 0 to N-1 (including 0 and N-1), and the symbol X _i,k PossiblyIt is also possible that the symbols with the modulated charge bits are those with the modulated data bits (depending on whether the subcarriers with index k are charge subcarriers or data subcarriers). In other scenarios, the value of k is set C _i Index of medium-charged subcarriers (i.e., M charged subcarriers), then symbol X _i,k Is the symbol with the charge bit modulated.

It can be appreciated that when the bit sequence s [ n ] is charged ]In the case of an all 1 sequence or an all 0 sequence, the charging bit sequence s [ n ]]The modulated symbols (i.e. X _i,k ) In the same way, more energy can be made to be higher than the starting voltage of the rectifier, so that the charging efficiency is improved.

It will also be appreciated that for OFDM symbols at the same time instant, the charging symbols that they contain may be obtained based on the same charging bit sequence. For OFDM symbols at different times, i.e. i takes different values, the charging symbols included in the OFDM symbols at different times may be obtained based on at least two different charging bit sequences. For example, the OFDM symbol(s) at time i may all be obtained based on the all-1 sequence, the OFDM symbol(s) at time i+1 may all be obtained based on the all-0 sequence, and the OFDM symbol(s) at time i+2 may all be obtained based on the all-1 sequence.

In another possible implementation manner, the charging symbol may be a charging time domain symbol obtained through fast fourier transform, or the charging symbol is a charging time domain symbol obtained through fast fourier transform and then preprocessing. The implementation of this preprocessing is referred to in the foregoing description and will not be described in detail here. The charge time domain symbol is a predefined charge wave The shape is obtained after sampling and ASK modulation. The number of sampling points of the sampling is M, and M is smaller than N; sampling frequency f _s . The predefined charging waveform may include one or more of the following: noise signal (noise signal), chaotic signal (chaos signal), triangular wave, pulse wave, or multitone signal. The transmitting end (e.g., the base station or a portion of the base station) may select which predefined charging waveform to use to generate the charging symbol as desired. For example, the transmitting end may select a predefined charging waveform according to its hardware capability; for example, the transmitting end only supports the waveform of the LPAPR, and then a noise signal or a chaotic signal can be selected to generate a charging symbol. Further exemplary, the transmitting end may also select a predefined charging waveform according to the charging efficiency required by the receiving end, for example, the receiving end needs a higher charging efficiency, and then the transmitting end may select a pulse waveform or a multi-tone waveform to generate the charging symbol.

Table 3 below gives several expressions of predefined charging waveforms by which discrete sample sequences of these charging waveforms can be obtained, where p is the period of the predefined charging waveform.

TABLE 3 Table 3

Wherein, in the expression shown in the above Table 3, the symbols The symbols are expressed by taking the absolute value, and the same symbols are expressed by the same meaning and are not repeated.

Illustratively, taking triangular waves as an example, the transmitting end can perform a function on the triangular wavesSampling to obtain a discrete sampling sequence with the length of M; wherein the sampling frequency is f _s The number of sampling points is equal to M. The transmitting end can perform ASK modulation on the discrete sampling sequence to obtain M charging time domainsThe symbols. It will be appreciated that for a discrete sample sequence of purely real numbers, the modulation here is an ASK modulation of one way; for a discrete sample sequence containing complex numbers, the modulation here is two-way ASK modulation, i.e., IQ modulation (also called vector modulation).

Then, the transmitting end can perform Fast Fourier Transform (FFT) on the discrete M charge time domain symbols to obtain M frequency domain symbols, which are marked as S [ k ]]. The M frequency domain symbols can be modulated to a set C by a transmitting end _i On M charged sub-carriers included, i.e. according to set C _i Completion of slave S [ k ]]To charge sign X _i,k Is a one-to-one mapping of (a) to (b). The transmitting end can also pre-process the M frequency domain symbols and then modulate the M frequency domain symbols to a set C _i The M charged subcarriers are included. Due to set C _i The charging subcarriers in (a) may be continuous or discontinuous, so that the positions of the charging symbols carried by the charging subcarriers in the frequency domain may be continuous or discontinuous.

It will be appreciated that such an implementation may embed a predefined arbitrary waveform into the OFDM symbol and that interference-free embedding may be achieved without the need for additional frequency domain guard bands. In addition, the implementation mode can also support richer waveforms, different charging waveforms can be designed for different rectifiers to ensure one-to-one matching, and better charging waveforms can be designed for each rectifier to realize higher-efficiency charging.

Alternatively, the above-mentioned (frequency domain) data symbols carried by the data subcarriers are obtained in a manner described in connection with 5G NR, which is only briefly described herein. For example, the transmitting end may generate a series of data bit sequences, and then perform serial-parallel conversion on the data bit sequences; and modulating the data bits after serial-parallel conversion or modulating and preprocessing to obtain data symbols. The implementation of preprocessing refers to the foregoing description, and is not repeated here. Here, the modulation method may be any of PSK, QAM, or ASK.

Alternatively, after obtaining the (frequency domain) charging symbol, the transmitting end may obtain one or more OFDM symbols at the i-th time by Inverse Fast Fourier Transform (IFFT). Of course, the transmitting end may also generate one or more OFDM symbols at the i-th time by IFFT after obtaining the (frequency domain) data symbols. The transmitting end can transmit all OFDM symbols at the ith moment after superposition, and of course, the transmitting end can also transmit all OFDM symbols at the ith moment at the same time, so that signals (or called as data coexistence signals) at the ith moment are obtained by superposition in the air.

In order to better understand the signal processing flow of the transmitting end in the embodiment of the present application, the following description is briefly described with reference to the drawings. For ease of description, the index of N subcarriers in the following figures is 0 to N-1, where K is known to be equal to (N-2), set C _i ^DATA For index 1 to index N-2, then M equals 2, set C _i Index 0 and index N-1. In other words, the subcarriers with indexes 1 to N-2 among the N subcarriers are data subcarriers, and the subcarriers with indexes 0 and N-1 are charging subcarriers.

Referring to fig. 5a, fig. 5a is a schematic diagram of a first signal processing flow provided in an embodiment of the present application. Fig. 5a shows a process of generating a digital coexistence able waveform (or digital coexistence able signal) by superimposing two OFDM symbols at the same time. Wherein the first OFDM symbol comprises two charging symbols and the second OFDM symbol comprises N-2 data symbols. X is X ₀ ,X ₁ ,...,X _N-2 ,X _N-1 Representing the symbols corresponding to the subcarriers with indexes 0 to N-1, respectively. As shown in fig. 5a, for the first OFDM symbol, X ₀ And X _N-1 The predefined symbols corresponding to hpppr modulation in table 1 above may be; and X is ₁ ,...,X _N-2 All 0's indicate that there is no energy on the subcarriers with indexes 1 to N-2, which are null subcarriers. The sender can respectively send the predefined symbol X ₀ And X _N-1 Preprocessing to obtain energy charging symbol X' ₀ And X' _N-1 . The transmitting end can be used for transmitting the data of X' ₀ ,X ₁ ,...,X _N-2 ,X′ _N-1 Performing IFFT to generate a first OFDM symbol containing two charging symbols, namely X' ₀ And X' _N-1 . In short, in the generation of the first OFDM symbol, the subcarriers used for transmitting data (i.e., subcarriers with indexes 1 to N-2) are given as null subcarriers (energy of 0) and remain unused. These areSubcarriers (referring to subcarriers with indexes 1 to N-2) can be allocated to data transmission and used for other functions, but are all regarded as empty subcarriers (energy is 0) in the generation process of the first OFDM symbol.

As shown in fig. 5a, for the second OFDM symbol, the transmitting end generates a series of data bit sequences, and performs serial-parallel conversion on the series of data bit sequences; according to set C _i ^DATA Modulating the data bits after serial-parallel conversion to obtain a modulation symbol X ₁ ,...,X _N-2 Then preprocessing to obtain data symbol X' ₁ ,...,X′ _N-2 . And symbol X ₀ And X _N-1 All are 0, indicating that there is no energy on the subcarriers with indexes 0 and N-1, which are null subcarriers. The transmitting end can be used for transmitting the data of the X ₀ ,X′ ₁ ,...,X′ _N-2 ,X _N-1 Performing IFFT to generate a second OFDM symbol containing N-2 data symbols, i.e., X' ₁ ,...,X′ _N-2 . In short, in the generation of the second OFDM symbol, the subcarriers that can be used for charging (i.e., the subcarriers with indexes 1 and N-1) are given as null subcarriers (energy is 0) and remain unused.

As shown in fig. 5a, the transmitting end may perform parallel-serial conversion, windowing, cyclic Prefix (CP) (not shown in fig. 5 a) and other processes on the first OFDM symbol and the second OFDM symbol, and then amplify the first OFDM symbol by using a Power Amplifier (PA), and then superimpose the first OFDM symbol and the second OFDM symbol to obtain a digital coexisting waveform (or a digital coexisting signal). Finally, the digital coexistence waveform (or digital coexistence signal) is transmitted by a radio frequency unit (such as an antenna). Illustratively, the first OFDM symbol may be amplified by a first power amplifier after various processing, and the second OFDM symbol may be amplified by a second power amplifier after various processing. Since data transmission needs to ensure that the signal is transmitted without distortion, the PA typically used to amplify the data signal is a linear PA and power backoff is performed according to the PAPR of the data signal. That is, the second power amplifier may be a linear PA that performs power backoff. While energy transmission does not require demodulation, a nonlinear PA or a linear PA that does not perform power backoff may be employed to amplify the signal. That is, the first power amplifier may be a non-linear PA or a linear PA that does not perform power backoff. Of course, the first OFDM symbol and the second OFDM symbol may also be amplified by the same power amplifier, for example, by linear PA amplification with power backoff, which is not limited by the embodiments of the present application.

Alternatively, the first OFDM symbol and the second OFDM symbol may be generated by different signal processing units. That is, the transmitting end may need a plurality of signal processing units for generating a plurality of OFDM symbols at the same time, respectively. Of course, the first OFDM symbol and the second OFDM symbol may also be generated by a set of signal processing units. For example, the transmitting end may generate the first OFDM symbol by using a set of signal processing units, and perform various processes (such as parallel-serial conversion, windowing, adding cyclic prefix, etc.) on the first OFDM symbol by using the set of signal processing units, and then amplify the first OFDM symbol by using the first power amplifier and buffer the first OFDM symbol; and generating a second OFDM symbol by using the set of signal processing units, performing various processes (such as parallel-serial conversion, windowing, cyclic prefix adding and the like) on the second OFDM symbol by using the set of signal processing units, amplifying the second OFDM symbol by using a second power amplifier, and then superposing the second OFDM symbol and the buffered signal to generate a digital-to-analog coexisting signal.

Optionally, the first OFDM symbol and the second OFDM symbol may be overlapped after parallel-serial conversion is completed, or overlapped after windowing is completed, or overlapped after CP is added, etc., which is not limited by the embodiment of the present application.

It can be understood that, through the signal processing flow of fig. 5a, a multitone waveform (i.e., the time domain waveform of the first OFDM symbol) capable of being embedded in the OFDM waveform can be obtained, and the number of syllables is equal to the number M of charge subcarriers. In brief, if a four-tone waveform is to be generated, then an appropriate M is selected such that m=4. The multitone waveform constructed by fig. 5a can be embedded into an OFDM waveform without interference.

Referring to fig. 5b, fig. 5b is a schematic diagram of a second signal processing flow according to an embodiment of the present application. Fig. 5b differs from the aforementioned fig. 5a in that: the transmitting end does not overlap the first OFDM symbol and the second OFDM symbol before transmitting, but obtains a digital coexisting waveform (or digital coexisting signal) by an over-the-air wireless overlapping manner. As shown in fig. 5b, the transmitting end may perform parallel-serial conversion, windowing, adding a cyclic prefix (not shown in fig. 5 b) and other processes on the first OFDM symbol and the second OFDM symbol, and then amplify the first OFDM symbol with a Power Amplifier (PA), and then transmit the first OFDM symbol and the second OFDM symbol simultaneously by a radio frequency unit (such as an antenna). It will be appreciated that the two signals transmitted simultaneously by the radio frequency unit may be superimposed over the air to obtain a digital coexistence waveform (or digital coexistence signal).

It can also be appreciated that, since the subcarriers with indexes 1 to N-2 are given as null subcarriers (energy of 0) in the generation process of the first OFDM symbol, they are not used; in the generation of the first OFDM symbol, the subcarriers with indexes 1 and N-1 are given as null subcarriers (energy of 0) and remain unused. Therefore, when the first OFDM symbol and the second OFDM symbol are overlapped on the time domain, the energy charging symbol does not interfere with the data symbol, and the coexistence of wireless energy transmission and data transmission can be realized. In addition, the time domain waveform obtained by the energy charging symbol through IFFT in the embodiment of the application is similar to the multi-tone waveform in shape, so that the energy charging efficiency can be improved.

Referring to fig. 5c, fig. 5c is a schematic diagram of a third signal processing flow provided in an embodiment of the present application. Fig. 5c shows a process of generating a digital coexistence able waveform (or digital coexistence able signal) by superimposing three OFDM symbols at the same time. Wherein the first OFDM symbol comprises one or more charging symbols, the second OFDM symbol comprises another one or more charging symbols, and the third OFDM symbol comprises N-2 data symbols. X is X ₀ ,X ₁ ,...,X _N-2 ,X _N-1 Representing the symbols corresponding to the subcarriers with indexes 0 to N-1, respectively. As shown in fig. 5c, M (where M is equal to 2) charging symbols are respectively input into multiple sets of signal processing processes, and each set of signal processing processes may generate an OFDM symbol, where the OFDM symbol includes one or more charging symbols. Illustratively, as shown in fig. 5c, in the generation of the first OFDM symbol, subcarriers with indexes 1 to N-1 are given as null subcarriers (energy is 0) and remain unused; and the charging sign X' ₀ Carried on subcarriers with index 0. In the generation process of the second OFDM symbol, the index is 0 to N-2The carrier is given as a null subcarrier (energy 0), reserved; and the charging sign X' _N-1 Carried on the sub-carrier with index N-1. In the generation of the third OFDM symbol, the subcarriers used for charging (i.e., the subcarriers with indexes 1 and N-1) are given as null subcarriers (energy is 0) and are reserved. It will be appreciated that the first OFDM symbol and the second OFDM symbol in fig. 5c are generated in the same manner as the first OFDM symbol in fig. 5a, and the third OFDM symbol in fig. 5c is generated in the same manner as the second OFDM symbol in fig. 5a, which are not described in detail here. It can be further understood that the method of generating the digital coexistence waveform by overlapping three OFDM symbols (i.e., the first OFDM symbol, the second OFDM symbol, and the third OFDM symbol) at the same time in fig. 5c is referred to the corresponding description in fig. 5a, and is not repeated here. Wherein, before superposition, three OFDM symbols at the same time may be amplified by two or three PAs, the PAs used for amplifying the first OFDM symbol and the second OFDM symbol (such as a nonlinear PA or a linear PA that does not perform power backoff) may be the same or the same class, and the PAs used for amplifying the third OFDM symbol (such as a linear PA that performs power backoff) are different from the PAs used for amplifying the first OFDM symbol and the second OFDM symbol.

It will be appreciated that if the first OFDM symbol comprises a plurality of charging symbols (not shown in fig. 5 c), such as charging symbol X' ₀ And X' _N-1 The method comprises the steps of carrying out a first treatment on the surface of the The second OFDM symbol comprises a charging symbol X' _N-1 (as shown in fig. 5 c); after the first OFDM symbol is overlapped with the second OFDM symbol, the sub-carrier with the index of N-1 carries two charging symbols. If the first OFDM symbol comprises a plurality of charging symbols (not shown in FIG. 5 c), e.g., the first OFDM symbol comprises charging symbol X' ₀ And X' _N-1 The method comprises the steps of carrying out a first treatment on the surface of the The second OFDM symbol comprises a plurality of charging symbols (not shown in FIG. 5 c), such as charging symbol X' ₀ And X' _N-1 The method comprises the steps of carrying out a first treatment on the surface of the After the first OFDM symbol and the second OFDM symbol are overlapped, the subcarrier with the index of 0 carries two charging symbols, and the subcarrier with the index of N-1 also carries two charging symbols. Of course, the first OFDM symbol may also include a charging symbol X' ₀ As shown in fig. 5c, while the second OFDM symbol comprises a plurality of charging symbols (not shown in fig. 5 c),such as charging symbol X' ₀ And X' _N-1 The method comprises the steps of carrying out a first treatment on the surface of the After the first OFDM symbol and the second OFDM symbol are superimposed, the sub-carrier with index 0 carries two charging symbols. Briefly, one charging subcarrier after superposition may carry one or more charging symbols. For convenience of description, only one charging symbol is taken as an example of carrying one charging subcarrier. The generation manner of the charging symbol is referred to in the foregoing description, and is not repeated here.

Referring to fig. 6a and 6b, fig. 6a and 6b are schematic diagrams of fourth and fifth signal processing flows according to an embodiment of the present application. Fig. 6a shows a process of generating a digital coexistence waveform (or digital coexistence signal) by superimposing two OFDM symbols at the same time, which is different from the signal processing flow shown in fig. 5a in that the charging symbol X' ₀ And X' _N-1 The generation mode of (3). Specifically, in fig. 6a, the transmitting end may generate a charging bit sequence with a length of lxm (where M is equal to 2) in advance, and perform operations such as serial-to-parallel conversion, modulation (modulation scheme of multiplexing 5G NR), preprocessing, etc. on the charging bit sequence to generate a charging symbol X' ₀ And X' _N-1 . Fig. 6b shows a process of generating a digital coexistence waveform (or digital coexistence signal) by superimposing three OFDM symbols at the same time, which is different from the signal processing procedure shown in fig. 5c in that the charging symbol X' ₀ And X' _N-1 The generation mode of (3). In fig. 6b, the transmitting end may perform operations such as serial-parallel conversion (may be omitted), modulation, preprocessing, etc. on the l charge bits to generate a charge symbol X' ₀ The method comprises the steps of carrying out a first treatment on the surface of the After serial-parallel conversion (which can be omitted), modulation, preprocessing, etc. of the other l charge bits, a charge symbol X 'is generated' _N-1 。

Referring to fig. 7a and 7b, fig. 7a and 7b are schematic diagrams of sixth and seventh signal processing flows according to an embodiment of the present application. The signal processing flow shown in fig. 7a is different from the signal processing flow shown in fig. 5a in that the charging symbol X' ₀ And X' _N-1 The generation mode of (3). In fig. 7a, the transmitting end may select a predefined charging waveform as required, and then sample the selected charging waveform and perform time-domain ASK modulationM (where M is equal to 2) charged time domain symbols are obtained. The transmitting end performs operations such as serial-parallel conversion, FFT, sequential mapping (or modulation) and preprocessing on the M (M=2) charging time domain symbols to obtain charging symbols X' ₀ And X' _N-1 . The signal processing flow shown in FIG. 7b also differs from the signal processing flow shown in FIG. 5c in that the charging symbol X' ₀ And X' _N-1 The generation mode of (3). In fig. 7b, the transmitting end may select a predefined charging waveform according to needs, and then sample and time-domain ASK modulate the selected charging waveform to obtain M (where M is equal to 2) charging time-domain symbols. The transmitting end performs operations such as serial-parallel conversion (which may be omitted), FFT, sequential mapping (or modulation) and preprocessing on the M (m=2) charging time domain symbols, respectively, to obtain charging symbol X' ₀ And X' _N-1 。

It will be understood that, in the signal processing flows shown in fig. 5a to fig. 7b, the number of OFDM symbols, the number of charging symbols, the number of data symbols, etc. at the same time are all examples, and the embodiments of the present application are not limited.

The embodiment of the application uses the charged sub-carrier to transmit energy, uses the data sub-carrier to transmit data, and sets C _i And set C _i ^DATA Is empty as the intersection ofThat is, the energy-charging sub-carrier and the data sub-carrier are not overlapped in the frequency domain, so that the energy transmission cannot interfere with the data transmission, thereby realizing coexistence of wireless energy transmission and data transmission and reducing the influence of the wireless energy transmission on the data transmission.

The foregoing describes the signal processing procedure of the transmitting end, and the following describes the signal processing procedure of the receiving end in the embodiment of the present application.

In one possible implementation, it is assumed that a certain receiver is a receiver that only performs energy harvesting, such as certain IoT devices. Illustratively, electromagnetic waves (such as a digital energy coexistence signal) in the air are converted into alternating current signals through a receiver antenna of the IoT device and enter a rectifier, the rectifier rectifies and filters the alternating current signals into direct current signals, the direct current signals are sent to a power management module of the IoT device, and finally the power management module sends the direct current signals to a battery to achieve energy storage.

In another possible implementation, if the receiving end is a receiving end that needs to perform data demodulation, such as a receiving end that only performs data demodulation, and a receiving end that needs to perform both data demodulation and energy collection. The signal processing method shown in fig. 4 further includes the following steps:

and S103, the receiving end (such as a terminal) receives one or more OFDM symbols, the one or more OFDM symbols are borne on the same resource block, the same resource block comprises the N subcarriers, the N subcarriers comprise M charge subcarriers and K data subcarriers, the intersection of the M charge subcarriers and the K data subcarriers is an empty set, the charge subcarriers carry the charge symbols, and the data subcarriers are used for carrying the data symbols.

S104, the receiving end (such as a terminal) demodulates the K data subcarriers.

It can be understood that, whether the transmitting end transmits one OFDM symbol or multiple OFDM symbols at the same time, since the multiple OFDM symbols at the same time are superimposed in the air, the data symbol and the charging symbol exist in the signal received by the receiving end at the same time, and the signal received by the receiving end naturally contains the information of the multiple OFDM symbols at the same time.

Thus, for a receiving end that needs to perform both data demodulation and energy harvesting, it receives a signal that performs energy harvesting on the one hand and data demodulation on the other hand. Because the energy collection does not need demodulation, the receiving end does not need to know which subcarriers are provided with charging symbols during the energy collection, and the received electromagnetic waves (i.e. signals) can be converted into alternating current signals to be sent to a rectifier, and the alternating current signals are rectified and filtered by the rectifier to be changed into direct current signals to be stored. For data demodulation, since the receiving end knows the index of the data sub-carriers, i.e. the known set C _i ^DATA So that the receiving end can find out the signal belonging to the set C after receiving the (data coexistence) signal _i ^DATA Is allocated to the K data subcarriers. The receiving end may demodulate the K data subcarriers to obtain data information (such as a data bit sequence) carried on the K data subcarriers. In particular, the data processing procedure of the receiving end may refer to the prior art, and will not be described in detail here.

The embodiment of the application not only can collect radio frequency energy at the receiving end, but also can demodulate data to obtain data information, thereby realizing coexistence of wireless energy transmission and data transmission, reducing influence of wireless energy transmission on data transmission and laying foundation for realizing wireless energy transmission through the base station.

Example two

The second embodiment of the application mainly introduces another method for generating a digital coexisting signal (or digital coexisting waveform) based on OFDM and DFT-s-OFDM.

Referring to fig. 8, fig. 8 is a schematic diagram of a second flow of a signal processing method according to an embodiment of the present application. As shown in fig. 8, the signal processing method includes, but is not limited to, the steps of:

s201, the transmitting end (e.g. the base station or a part of the base station) obtains an OFDM symbol.

S202, the transmitting end (e.g. the base station or a part of the base station) transmits the OFDM symbol, where the OFDM symbol is carried on a resource block, and the resource block includes N subcarriers, where the N subcarriers include M charging subcarriers and K data subcarriers, where an intersection of the M charging subcarriers and the K data subcarriers is an empty set, where the charging subcarriers carry charging symbols, and where the data subcarriers are used to carry data symbols. Wherein N, M, K are all positive integers.

It can be seen that one of the differences between this method and the method shown in fig. 4 is that the transmitting end obtains a plurality of OFDM symbols in fig. 4, whereas the transmitting end obtains one OFDM symbol in this method. The transmitting end may receive the OFDM symbol from another entity, such as another part of the base station, or other network element, or may generate the OFDM symbol itself.

Optionally, the resource block includes a time domain resource and a frequency domain resource, and the frequency domain resource includes N subcarriers, that is, the resource block includes N subcarriers. The OFDM symbol may be an OFDM symbol at the i-th time, where the OFDM symbol occupies N subcarriers, that is, the OFDM symbol is carried on N subcarriers. This OFDM symbol may comprise data symbols and charging symbols, and optionally pilot symbols. The difference between the pilot symbols and the charging symbols can be seen from the description of the first embodiment, and is not repeated here. The N subcarriers may include M charged subcarriers and K data subcarriers. The intersection of the M charging subcarriers and the K data subcarriers is a null set, that is, the charging subcarriers and the data subcarriers are located on different frequency points. One charging subcarrier may carry one or more charging symbols and one data subcarrier may carry one data symbol. In the embodiment of the application, the charging symbol and the data symbol can be symbols on a frequency domain.

Because the energy charging symbols and the data symbols are carried on different subcarriers, the embodiment of the application avoids the interference among the symbols, thus the embodiment of the application can realize the coexistence of wireless energy transmission and data transmission and reduce the influence of the wireless energy transmission on the data transmission.

Alternatively, the indexes of the K data subcarriers may be predefined, preconfigured, or agreed by the transceiver, etc., and the embodiments of the present application are not limited. The index of the K data subcarriers may be set C _i ^DATA And (3) representing. The index of the M charging subcarriers can be set C _i And (3) representing. Set C _i And set C _i ^DATA Is an empty set, i.eExemplary, set C _i May include the index of all or part of the N subcarriers except the data subcarrier, or set C _i The index of all or part of the subcarriers except the data subcarriers and the pilot subcarriers in the N subcarriers may be included, and the embodiment of the present application does not limit the allocation policy of the charging subcarrier resources. It will also be appreciated that since the charging subcarriers do not carry data information, there is no need forDemodulation so that the transmitting end can determine set C _i (i.e. the sender can select which sub-carriers are charging sub-carriers by itself), and there is no need to use set C _i Informing the receiving end. Of course, in order to be able to demodulate the data correctly, the transceiver needs to know the set C _i ^DATA (i.e., the data subcarriers described above).

Alternatively, the (frequency domain) charging symbol in the embodiment of the present application may have various implementation manners, and the detailed description of the foregoing embodiment is omitted here. For example, the charging symbol may be a predefined symbol, or the charging symbol is obtained by preprocessing a predefined symbol. For another example, the charging symbol may be generated after the charging bits in the charging bit sequence are modulated, or the charging symbol is obtained by modulating and then preprocessing the charging bits in the charging bit sequence. For another example, the charging symbol may be obtained by performing fast fourier transform on a charging time domain symbol, or the charging symbol may be obtained by performing fast fourier transform on a charging time domain symbol and then performing preprocessing. The generation manner of the (frequency domain) data symbols in the embodiment of the present application is referred to in the related description of 5G NR, and is not described in detail herein.

In a possible implementation manner, the transmitting end may reserve M null subcarriers in the process of generating the data symbol, and allocate energy charging symbols to the M null subcarriers, where the energy charging symbols may be generated in advance. In another possible implementation manner, the transmitting end may also reserve K null subcarriers in the process of generating the charging symbol, and carry data symbols on the K null subcarriers, where the data symbols may be generated in advance. The transmitting end may then generate one OFDM symbol from the M charging symbols and the K data symbols through IFFT. The transmitting end can process the OFDM symbol through parallel-serial conversion, windowing, adding CP, etc., then amplify the OFDM symbol through a Power Amplifier (PA), and finally transmit the OFDM symbol through a radio frequency unit (such as an antenna). Therefore, the embodiment of the application can complete the generation of the digital coexisting waveforms (or digital coexisting signals) under the condition of one set of hardware (such as one set of signal processing unit and one power amplifier), thereby saving the cost.

To better understand the present applicationThe signal processing flow of the transmitting end of the embodiment is briefly described with reference to the drawings. For convenience of description, the index of N subcarriers is 0 to N-1 in the following figures, known as set C _i ^DATA For index 1 to index N-2, then set C _i Index 0 and index N-1. In other words, the subcarriers with indexes 1 to N-2 among the N subcarriers are data subcarriers, and the subcarriers with indexes 0 and N-1 are charging subcarriers.

Referring to fig. 9, fig. 9 is a schematic diagram of an eighth signal processing flow provided in an embodiment of the present application. As shown in fig. 9, in the process of generating the charging symbol, the transmitting end reserves K (where k=n-2) null subcarriers, such as subcarriers with indexes 1 to N-2; and carries data symbols on the K subcarriers, which may be generated in advance. Wherein X is ₀ ,X ₁ ,...,X _N-2 ,X _N-1 Representing the symbols corresponding to the subcarriers with indexes 0 to N-1, respectively. Symbol X ₀ And X _N-1 The energy charging symbol X 'is obtained after pretreatment' ₀ And X' _N-1 The method comprises the steps of carrying out a first treatment on the surface of the And symbol X ₁ ,...,X _N-2 May be a data symbol. The generation of the charging symbols and the data symbols may be described in detail in the foregoing, such as fig. 5a-5c, fig. 6a, fig. 6b, fig. 7a, or fig. 7 b. The transmitting end can be used for transmitting the data of X' ₀ ,X ₁ ,...,X _N-2 ,X′ _N-1 The OFDM symbols are generated by IFFT, and then may be processed by parallel-to-serial conversion, windowing, cyclic prefix (not shown in fig. 9), etc., amplified by a Power Amplifier (PA), and finally transmitted by a radio frequency unit (such as an antenna).

In the embodiment of the application, a charging subcarrier and a data subcarrier exist in one OFDM symbol at the same time, wherein the charging subcarrier carries the charging symbol, and the data subcarrier still multiplexes the existing or future possible standards adopting the OFDM symbol, such as the 4G or 5G standard or the 6G standard of 3GPP, or the WiFi standard carries the data symbol. Because the energy charging sub-carrier and the data sub-carrier are not overlapped in the frequency domain, the energy transmission cannot interfere with the data transmission, so that the coexistence of wireless energy transmission and data transmission can be realized, and the influence of the wireless energy transmission on the data transmission is reduced.

In another possible implementation, if the receiving end is a receiving end that needs to perform data demodulation, such as a receiving end that only performs data demodulation, and a receiving end that needs to perform both data demodulation and energy collection. The signal processing method shown in fig. 8 may further include the steps of:

s203, a receiving end (such as a terminal) receives the OFDM symbol, the OFDM symbol is carried on a resource block, the resource block comprises the N sub-carriers, the N sub-carriers comprise M charging sub-carriers and K data sub-carriers, the intersection of the M charging sub-carriers and the K data sub-carriers is an empty set, the charging sub-carriers carry charging symbols, and the data sub-carriers are used for carrying data symbols.

S204, the receiving end (such as a terminal) demodulates the K data subcarriers.

Alternatively, the implementation manners of step S203 and step S204 in the embodiment of the present application may refer to the implementation manners of step S103 and step S104 in the foregoing first embodiment, which is not described herein.

Example III

The third embodiment of the present application introduces another method for generating a digital coexisting signal (or digital coexisting waveform).

Referring to fig. 10, fig. 10 is a schematic diagram of a third flow of a signal processing method according to an embodiment of the present application. As shown in fig. 10, the signal processing method includes, but is not limited to, the steps of:

s301, a transmitting end (such as a base station or one part of the base station) obtains a charging sub-signal, and the charging sub-signal is generated by preprocessing a charging symbol sequence.

The transmitting end may receive the charging sub-signal from other entities, or may generate the charging sub-signal itself.

S302, the transmitting end (e.g. a base station or a part of a base station) obtains a data sub-signal, where the data sub-signal includes an OFDM symbol, where the OFDM symbol is carried on a resource block, where the resource block includes M consecutive subcarriers and K data subcarriers, where the K data subcarriers carry data symbols, and where the M consecutive subcarriers are used to carry the charging sub-signal. Wherein M and K are positive integers.

Alternatively, in the embodiment of the present application, the step S301 and the step S302 may be performed in parallel, or may be performed sequentially, for example, the step S301 is performed before the step S302, or the step S301 is performed after the step S302.

The transmitting end may receive the data sub-signal from other entities, or may generate the data sub-signal itself. S303, the transmitting end (e.g. the base station or a part of the base station) transmits a signal, where the signal includes the charging sub-signal and the data sub-signal, and the frequency ranges of the M continuous sub-carriers include the frequency range of the charging sub-signal. This signal may also be referred to as a digital coexistence capable signal or a digital coexistence capable waveform.

Optionally, the preprocessing may include limiting the frequency spectrum of the sequence of charged symbols to a certain range, e.g., the preprocessing is windowing. The sequence of charging symbols may be obtained by sampling a predefined charging waveform and time-domain ASK modulation, and the number of the samples may be N. N may be equal to the number of subcarriers occupied by one OFDM symbol. The predefined charging waveform may include one or more of the following: noise signals, chaotic signals, triangular waves, pulsed waves, or multitone signals. For example, the expression of the predefined charging waveforms may be shown in table 3 in the first embodiment, and the discrete sampling sequences of the charging waveforms may be obtained by the expression, which is not described herein.

Alternatively, the transmitting end (e.g. the base station or a part of the base station) may select which predefined charging waveform is used to generate the charging sub-signal according to need, and the specific selection policy may refer to the description of the foregoing embodiment one, which is not described in detail herein. Taking triangular wave as an example, the sending end can sample the triangular wave function to obtain a discrete sampling sequence s [ N ] with the length of N ]N has a value of 0 to N-1. Wherein the sampling frequency is f _s The number of sampling points is equal to N. The transmitting end can perform the discrete sampling sequence s [ n ]]And performing time domain ASK modulation to obtain a charging symbol sequence. It will be appreciated that for a discrete sample sequence s [ n ] that is purely real]The modulation here is one-way ASK modulation; and for a discrete sample sequence s [ n ] containing complex numbers]The modulation here is two-way ASK modulation, i.e., IQ modulation (also called vector modulation). Then, the transmitting end may window the charging symbol sequence, that is, the point multiplication window function of the charging symbol sequence, to generate a charging sub-signal. It will be appreciated that the purpose of windowing is to limit the frequency of the sequence of charging symbols to a range that is related to the spectral width allocated for use by charging in the transmission bandwidth (bandwidth). Assuming that M consecutive subcarriers are reserved for carrying the charging sub-signals by the transmitting end in the process of generating the data sub-signals, and further assuming that the subcarrier spacing is Δf, the frequency width of the window can be determined based on the product of M and the subcarrier spacing Δf. For example, if there is no guard band between the charging sub-signal and the data sub-signal, or the reserved M consecutive sub-carriers contain guard sub-carriers, the frequency width of the window may be less than or equal to mxΔf. If there is a guard band between the charge sub-signal and the data sub-signal and the guard band is delta guard sub-carriers, the guard band has a width of delta x deltaf, and the window frequency width may be less than or equal to (M + delta) ) X Δf. Since the charge sub-signal does not need to be demodulated and does not carry data, the selection of the window function is more flexible, that is, the charge symbol sequence can use one of a plurality of window functions to limit the frequency of the charge symbol sequence within a certain range. The window function used in the charging symbol sequence may be a raised cosine window commonly used in a communication system, or may be another window function such as a gaussian window, which is not listed here.

It can be understood that the above-mentioned charge sub-signals are obtained in the time domain, and by windowing the charge symbol sequence, the frequency of the obtained charge sub-signals is within a certain range, so that the interference of the charge sub-signals and the data sub-signals in the frequency domain can be reduced.

Alternatively, the above-mentioned data sub-signal generating manner may multiplex existing or future possible standards using OFDM symbols, such as the 4G or 5G standard or the 6G standard of 3GPP, or the WiFi standard, which is not described herein. The data sub-signals may comprise OFDM symbols, which may comprise data symbols and optionally pilot symbols. The pilot symbols may be used for channel estimation to aid in demodulation of the data symbols. The OFDM symbol may be carried on a resource block, which may have a spectral width equal to a transmission bandwidth (bandwidth), which may contain N subcarriers. The resource block may include M consecutive subcarriers and K data subcarriers. In other words, the data sub-signals may be carried on K data sub-carriers of the resource block. In other words, in the process of generating the data sub-signal, the transmitting end may reserve M consecutive sub-carriers to carry the charging sub-signal. The frequency range of the M consecutive sub-carriers then comprises the frequency range of the charging sub-signal described above.

Alternatively, the index of the K data subcarriers may be set C' _i ^DATA And (3) representing. The index of the M consecutive sub-carriers can be set C' _i Representation, set C' _i And set C' _i ^NR Is an empty set, i.eSet C' _i ^DATA Index set C, which may be based on data subcarriers known to both parties _i ^DATA Determine, exemplary set C' _i ^DATA May be set C _i ^DATA A full set or subset of (a). Set C' _i Can be based on set C _i Determining, exemplary set C _i Is set C' _i Is a subset or a whole set of (a). Set C _i And set C _i ^DATA Is also an empty set, i.e. +.>If set C _i The index of the subcarriers is consecutive, set C' _i And set C _i The same applies. If set C _i The index of the subcarriers is not contiguous, and continuity can be ensured by forcedly occupying some subcarriers. For example, set C _i With index 1, 2, 4 sub-carriers, set C _i ^DATA With index 3 sub-carriers in it, then set C can be occupied _i ^DATA Subcarrier with index 3 in order to ensure continuity, then set C' _i The index contained is 1, 2, 3, 4, and set C' _i ^DATA Contains set C _i ^DATA All subcarriers with index 3 are divided.

Exemplary, set C _i ^DATA May be predefined, or preconfigured, or agreed in advance by both parties, etc., and embodiments of the present application are not limited. When the sender discovers that the sender is based on the set C _i ^DATA And the set C determined by the N subcarriers _i When the indexes of the sub-carriers in the system are discontinuous, the transmitting end can forcedly occupy some sub-carriers to ensure the continuity of the charging sub-carriers. The transmitting end can inform the receiving end of the index of the preempted subcarrier, so that the receiving end can calculate the index and the set C of the preempted subcarrier _i ^DATA Determining set C _i ^DATA (i.e., the K data subcarriers described above). Of course, the transmitting end may also directly inform the receiving end set C' _i ^DATA (i.e. as described aboveK data subcarriers). The embodiment of the application does not limit how the sending end and the receiving end can obtain the set C 'in particular' _i ^DATA An implementation of (i.e., the K data subcarriers described above).

Optionally, in the process of generating the charging sub-signal, the out-of-band interference can be effectively suppressed by windowing the charging symbol sequence, but in order to reduce the interference of the charging sub-signal on the data sub-signal as much as possible. The embodiment of the application can also increase a certain protection bandwidth in the frequency domain, namely, increase the protection bandwidth between the charging sub-signal and the data sub-signal. The guard bandwidth may be equal to the guard subcarrier number delta times the subcarrier spacing deltaf. Wherein the guard sub-carrier may be a number of consecutive Resource Elements (REs) or Resource Blocks (RBs).

In a possible implementation manner, the resource block further includes Δ guard subcarriers, that is, the M consecutive subcarriers do not include guard subcarriers, or the M consecutive subcarriers may be all used to carry charging sub-signals. The delta guard subcarriers may be used to separate the M consecutive subcarriers from the data subcarriers. Assume that the range of the M consecutive subcarriers is [ I ] _min ,I _max ]Wherein I _min Representing the minimum value of subcarrier indexes in the M continuous subcarriers, I _max Representing the maximum value of subcarrier indexes in the M consecutive subcarriers. Then in the generation of the data sub-signal, the sub-carrier range I _min ,I _max ]The inner is a null sub-carrier (energy is 0) and reserved for the charging sub-signal. On this basis, assuming that the guard bandwidth is Δ REs, it is also necessary to reserve Δ REs as frequency domain guard intervals and to separate the M consecutive subcarriers from the data subcarriers.

Referring to fig. 11, fig. 11 is a schematic diagram of a frequency band distribution of a data sub-signal and a charging sub-signal according to an embodiment of the present application. Fig. 11 shows respectively: (1) When I _min When the frequency band distribution of the data sub-signal and the charging sub-signal is equal to 0; (2) When I _max When the frequency band distribution of the data sub-signal and the charge sub-signal is equal to N-1; and (3) when I _min Is not equal to 0 andI _max and when the frequency band distribution is not equal to N-1, the frequency band distribution of the data sub-signal and the charging sub-signal is distributed. The charging frequency band represents a frequency band occupied by the charging sub-signal, and the data frequency band represents a frequency band occupied by the data sub-signal. As shown in FIG. 11, when I _min When equal to 0, the delta guard subcarriers (i.e., guard bandwidth) may be located in the charging band [ I ] _min ,I _max ]Right side of (2); then in the generation of the data sub-signal, the sub-carrier range I _min ,I _max +Δ]The inner is null sub-carrier (energy 0), and the total bandwidth is (M+delta) ×deltaf. As shown in FIG. 11, when I _max When equal to N-1, the delta guard subcarriers (i.e., guard bandwidth) may be located in the charging band [ I ] _min ,I _max ]Left side of (2); then in the generation of the data sub-signal, the sub-carrier range I _min -Δ,I _max ]The inner are all null subcarriers (energy 0) and the total bandwidth is still (m+Δ) ×Δf. As shown in FIG. 11, when I _min Not equal to 0 and I _max When not equal to N-1, the delta guard sub-carriers (i.e., guard bandwidths) can be located in the charging band [ I ] _min ,I _max ]Is arranged on both sides of (2); then in the generation of the data sub-signal, the sub-carrier range The inner are all null subcarriers (energy 0) and the total bandwidth is still (m+Δ) ×Δf.

In another possible implementation manner, the M consecutive subcarriers include Δ guard subcarriers, that is, other subcarriers except the Δ guard subcarriers in the M consecutive subcarriers may be used to carry the charging subcarriers. The delta guard subcarriers may be used to separate the subcarriers carrying the charging subcarriers from the subcarriers carrying the data subcarriers.

Optionally, after the transmitting end obtains the charging sub-signal and the data sub-signal, the charging sub-signal and the data sub-signal may be superimposed to obtain a digital-to-analog coexisting signal or a digital-to-analog coexisting waveform. Or the transmitting end can also amplify the charging sub-signal and the data sub-signal through a Power Amplifier (PA) respectively and then superimpose the signals to obtain the digital energy coexisting signal. The transmitting end can transmit the digital coexistence signal. Of course, the transmitting end can also amplify the charge sub-signal and the data sub-signal through a Power Amplifier (PA) and then transmit the charge sub-signal and the data sub-signal at the same time, so that the charge sub-signal and the data sub-signal are overlapped in the air to obtain the digital energy coexisting signal. The charge sub-signal and the data sub-signal may be amplified by different power amplifiers, for example, but may be amplified by the same power amplifier. For example, the charge sub-signal may be amplified by a non-linear PA or a linear PA that does not perform power back-off, and the data sub-signal may be amplified by a linear PA that performs power back-off, which may reduce distortion of the data sub-signal.

In order to better understand the signal processing flow of the transmitting end in the embodiment of the present application, the following description is briefly described with reference to the drawings.

Referring to fig. 12, fig. 12 is a schematic diagram of a ninth signal processing flow provided in an embodiment of the present application. As shown in fig. 12, on the one hand, the transmitting end selects a predefined charging waveform according to needs, then samples the selected charging waveform and performs time-domain ASK modulation to obtain a charging symbol sequence, and then processes such as windowing the charging symbol sequence to generate a charging sub-signal. The transmitting end generates a reserved frequency domain guard interval and data sub-signals of M continuous sub-carriers on the other hand. The transmitting end amplifies the charging sub-signal and the data sub-signal through a Power Amplifier (PA) respectively and then superimposes the signals to obtain the digital-energy coexisting signal. The generation manner of the charging sub-signal and the data sub-signal may refer to the foregoing description, which is not repeated here.

The embodiment of the application can embed the predefined arbitrary waveform into the OFDM symbol by performing operations such as time domain windowing on the charging symbol sequence, reserving a frequency domain protecting band in the generation process of the data sub-signal, and the like, and can not generate interference on the data sub-signal, thereby realizing coexistence of wireless energy transmission and data transmission. If the embodiment of the application embeds the predefined multitone waveform into the OFDM symbol, the energy charging efficiency can be improved. In addition, the embodiment of the application can support richer waveforms, can design different charging waveforms for different rectifiers to ensure one-to-one matching, and can design better charging waveforms for each rectifier to realize higher-efficiency charging.

In another possible implementation, if the receiving end is a receiving end that needs to perform data demodulation, such as a receiving end that only performs data demodulation, and a receiving end that needs to perform both data demodulation and energy collection. The signal processing method shown in fig. 10 may further include the steps of:

s304, a receiving end (e.g. a terminal) receives a signal, where the signal includes the charging sub-signal and the data sub-signal, where the data sub-signal includes an OFDM symbol, where the OFDM symbol is carried on a resource block, where the resource block includes M consecutive sub-carriers and K data sub-carriers, where the K data sub-carriers carry data symbols, where the M consecutive sub-carriers are used to carry the charging sub-signal, and where a frequency range of the M consecutive sub-carriers includes a frequency range of the charging sub-signal.

And S305, the receiving end (such as a terminal) demodulates the data sub-signal.

Alternatively, for a receiving end that needs to perform both data demodulation and energy collection, it receives the signal to perform energy collection on the one hand and data demodulation on the other hand. Because the energy collection does not need demodulation, the receiving end does not need to know which subcarriers bear charging sub-signals when collecting the energy, but can convert the received electromagnetic waves (i.e. signals) into alternating current signals to send the alternating current signals into a rectifier, and the rectifier performs rectification and filtering to convert the alternating current signals into direct current signals The stream signal is stored. For data demodulation, the receiving end can learn the index of the data sub-carrier, namely the set C 'can be learned' _i ^DATA I.e. which subcarriers carry data sub-signals, the receiving end receives (co-existence of data) signals and then demodulates the data sub-signals to obtain data information (e.g. data bit sequences). In particular, the data processing procedure of the receiving end may refer to the prior art, and will not be described in detail here.

Example IV

The fourth embodiment of the application mainly introduces a signal processing method in which one subcarrier can carry a charging symbol and a data symbol at the same time. It will be appreciated that, similarly to the first to third embodiments, the fourth embodiment is also a description of the scheme for the resource at a certain time. Since the data transmission or the charging generally uses the resources of one or more time instants, the fourth embodiment may be combined with any of the first to third embodiments, for example, the i-th time instant satisfies any of the first to third embodiments, and the i+1-th time instant satisfies the fourth embodiment, which is not limited herein.

Referring to fig. 13, fig. 13 is a fourth flowchart of a signal processing method according to an embodiment of the present application. As shown in fig. 13, the signal processing method includes, but is not limited to, the steps of:

s401, the transmitting end (e.g. the base station or a part of the base station) obtains one or more OFDM symbols.

The transmitting end may receive one or more OFDM symbols from another entity, such as another portion of the base station or other network element, or may generate the one or more OFDM symbols by itself, or may receive a portion of the one or more OFDM symbols and generate other portions of the one or more OFDM symbols by itself.

S402, the transmitting end (e.g. the base station or a part of the base station) transmits one or more OFDM symbols, where the one or more OFDM symbols are carried on the same resource block, where the same resource block includes the N subcarriers, and the N subcarriers include at least one common subcarrier, and the common subcarrier carries the charging symbol and the data symbol. N is a positive integer.

In one possible implementation, the transmitting end may obtain a plurality of OFDM symbols and may transmit the plurality of OFDM symbols separately. Or the transmitting end may obtain a plurality of OFDM symbols, and may superimpose the plurality of OFDM symbols into one OFDM symbol for transmission, or into one signal (i.e., a digital coexisting signal or a digital coexisting waveform), where the signal includes one OFDM symbol. Here, the specific implementation manner of the transmitting end may refer to the implementation manners of step S101 and step S102 in the foregoing embodiment, which is not described herein again.

In another possible implementation, the transmitting end may obtain an OFDM symbol and transmit the OFDM symbol. Here, the specific implementation manner of the transmitting end may be the implementation manner of step S201 and step S202 in the foregoing second embodiment, which is not described herein again.

Only the differences between the embodiment of the present application and the first and second embodiments will be described below.

Optionally, M subcarriers are allocated to the charging use from among the N subcarriers, and K subcarriers are allocated to the data transmission use, but the subcarriers used for charging use and the subcarriers used for data transmission have an intersection. Suppose set C for indexing of K data subcarriers _i ^DATA Index set C representing M charge subcarriers _i Representation, thenThen after superposition of multiple OFDM symbols at the same time, some subcarriers carry both the charging symbol and the data symbol, and these subcarriers are referred to as common subcarriers. That is, the N subcarriers include at least one common subcarrier, and each common subcarrier carries both the charging symbol and the dataThe symbols. Of course, if there is only one OFDM symbol at the same time, some of the N subcarriers occupied by the OFDM symbol also carry the charging symbol and the data symbol. The generation manner of the charging symbol and the data symbol may be referred to the description of the first embodiment, which is not described in detail herein.

Referring to fig. 14a, fig. 14a is a schematic diagram of a tenth signal processing flow provided in an embodiment of the present application. Fig. 14a shows a process of generating a digital coexistence able waveform (or digital coexistence able signal) by superimposing two OFDM symbols at the same time. Wherein the index of N subcarriers is 0 to N-1, known set C _i ^DATA For index 1 to index N-2, set C _i For index 0 to index N-1, then the index of the common subcarrier is 1 to N-2. As shown in FIG. 14a, X ^e ₀ ,X ^e ₁ ,...,X ^e _N-2 ,X ^e _N-1 And respectively represent the charging symbols carried on the sub-carriers with indexes of 0 to N-1. The generation of the charging symbol is referred to various implementations of the first embodiment, and is not described in detail here. Transmitting end pair X ^e ₀ ,X ^e ₁ ,...,X ^e _N-2 ,X ^e _N-1 An IFFT is performed to generate a first OFDM symbol. As shown in FIG. 14a, X ^d ₁ ,...,X ^d _N-2 Representing data symbols carried on sub-carriers with indexes 1 to N-2 respectively, and X ^d ₀ And X ^d _N-1 All are 0, indicating that there is no energy on the subcarriers with indexes 0 and N-1, which are null subcarriers. The manner of generating the data symbols is referred to in the first embodiment and will not be described in detail here. Transmitting end pair X ^d ₀ ,X ^d ₁ ,...,X ^d _N-2 ,X ^d _N-1 IFFT is performed to generate a second OFDM symbol. Briefly, in the second OFDM symbol generation process, subcarriers with indexes of 0 and N-1 are given as null subcarriers (energy of 0) and are reserved. When the first OFDM symbol and the second OFDM symbol are overlapped, the sub-carriers with indexes of 1 to N-2 carry the energy charging symbol and the data symbol at the same time. Exemplary, sub-carriers with index 1 carry the charging symbol X at the same time ^e ₁ And data symbol X ^d ₁ The sub-carriers with index 2 simultaneously carry the charging symbol X ^e ₂ And data symbol X ^d ₂ And so on. Here, the overlapping manner, overlapping timing, etc. of the first OFDM symbol and the second OFDM symbol may refer to the related description of fig. 5a in the first embodiment, which is not repeated here. Here, in order to reduce distortion of the data signal, both the first OFDM symbol and the second OFDM symbol may be amplified using a linear PA that performs power backoff.

Referring to fig. 14b, fig. 14b is a schematic diagram of an eleventh signal processing flow provided in an embodiment of the present application. Fig. 14b shows a signal processing procedure for generating a digital coexisting waveform (or digital coexisting signal) by a set of hardware such as a set of signal processing units and a power amplifier. Wherein the index of N subcarriers is 0 to N-1, known set C _i ^DATA For index 1 to index N-2, set C _i For index 0 to index N-1, then the index of the common subcarrier is 1 to N-2. As shown in FIG. 14b, X ^e ₀ ,X ^e ₁ ,...,X ^e _N-2 ,X ^e _N-1 And respectively represent the charging symbols carried on the sub-carriers with indexes of 0 to N-1. The generation of the charging symbol is referred to various implementations of the first embodiment, and is not described in detail here. As shown in FIG. 14b, X ^d ₁ ,...,X ^d _N-2 The data symbols carried on the subcarriers with indexes 1 to N-2 are respectively indicated, and these data symbols may be pre-generated, and the specific generation manner refers to the first embodiment, which is not repeated here. The transmitting end can generate the charging symbol X ^e ₀ ,X ^e ₁ ,...,X ^e _N-2 ,X ^e _N-1 Thereafter, the data symbols X are carried on sub-carriers with indexes 1 to N-2 ^d ₁ ,...,X ^d _N-2 The charging symbols and the data symbols are carried on the subcarriers with indexes 1 to N-2. The sender may then send symbol X ^e ₀ ,X ^e ₁ +X ^d ₁ ,...,X ^e _N-2 +X ^d _N-2 ,X ^e _N-1 Performing IFFT to generate OFDM symbol, and then performing IFFT to the OFDM symbolAfter being processed by parallel-serial conversion, windowing and the like, the OFDM symbols are amplified by a power amplifier (such as a linear PA for carrying out power back-off) and finally transmitted by a radio frequency unit (such as an antenna).

S403, the transmitting end (such as the base station or a portion of the base station) transmits auxiliary demodulation information, where the auxiliary demodulation information is used to indicate the index of the at least one shared subcarrier and the charging symbol carried by the at least one shared subcarrier.

Optionally, in order to ensure that the receiving end can correctly demodulate the data carried on the at least one shared subcarrier, the transmitting end needs to transmit auxiliary demodulation information. The auxiliary demodulation information may be used to indicate one or more of: and the index of the at least one shared subcarrier or the charging symbol carried by the at least one shared subcarrier. By way of example, the auxiliary demodulation information may include one or more of the following: and the index of the at least one shared subcarrier or the charging symbol carried by the at least one shared subcarrier. Optionally, the item not indicated by the auxiliary demodulation information in one or more of the foregoing items is predefined or obtained through other approaches, which is not limited herein.

The auxiliary demodulation information may be carried by downlink control information (downlink control information, DCI) or may be carried by a data message transmitted by a physical downlink shared channel (physical downlink shared channel, PDSCH), which is not limited in this embodiment of the present application. The timing of sending the auxiliary demodulation information by the sending end may be before or after step S402 or may be after step S401, and the embodiment of the present application does not limit the timing of sending the auxiliary demodulation information by the sending end.

Optionally, the transmitting end may carry a pattern (pattern) index in the auxiliary demodulation information to indicate a charging symbol carried by the at least one common subcarrier. For example, the transmitting end and the receiving end may agree that the charging symbol carried by the at least one common subcarrier is modulated according to a preset pattern, and the preset pattern is known to both parties. The auxiliary demodulation information may include the shared subcarrier indexes and the selected modulation pattern indexes,to assist the receiving end in completing data demodulation. For set C _i The charging symbols carried on other charging subcarriers except for the at least one common subcarrier may be generated by various implementation manners in the foregoing embodiment, which is not described herein.

Optionally, the transmitting end may further send mode information, where the mode information may be used to indicate whether a common subcarrier exists in the N subcarriers. Alternatively, the mode information may be used to indicate whether some of the N subcarriers carry the charging symbol and the data symbol at the same time. The mode information may also be carried by a data message transmitted by DCI or PDSCH, which is not limited in the embodiment of the present application. The timing of sending the mode information by the sending end may be any timing of data transmission, for example, before or after step S403, or before or after step S401, which is not limited in the embodiment of the present application. In addition, the transmitting end may also transmit mode information in the access phase, where the mode information may be located in a message such as a radio resource control (radio resource control, RRC)/system information block (system information block, SIB) carrying downlink data.

For example, one possible parameter configuration is as follows:

UE-NR-WPT-Config::＝SEQUENCE{

SWIPT-Mode ENUMERATED(OFDM without overlap,SC without overlap,DFT-s-OFDM without overlap,OFDM with overlap,DFT-s-OFDM with overlap),

}

the transmitting end may indicate the current mode information by transmitting the above-mentioned parameter configuration. In the embodiment of the present application, the transmitting end fills "OFDM with overlap (overlapping OFDM)" or "DFT-s-OFDM with overlap (overlapping DFT-s-OFDM)" in the field "switch-Mode" to indicate that the signal has a common subcarrier or that some subcarriers in the signal carry the charging symbol and the data symbol at the same time. Here, "OFDM without overlap" in the above-described parameter configuration may indicate that there is no shared subcarrier in the OFDM-based data-capable coexistence signal (such as the data-capable coexistence signal generated in the first or second embodiment described above), that is, there is no intersection between the data subcarrier and the charging subcarrier. "DFT-s-OFDM without overlap" may mean that there are no common subcarriers in the DFT-s-OFDM based digital coexisting signal (digital coexisting signal generated as in the first or second embodiment described above). "SC without overlap" may indicate that there are no shared subcarriers in a single-carrier based digital coexistence signal (e.g., the signal generated in the aforementioned embodiment three).

It should be understood that the above parameter configuration is only one possible configuration, and any relevant configuration that indicates the charging function through an RRC message, such as including one or more of the configurations shown in the above swift-mode, is within the scope of the embodiments of the present application, and is not limited to a specific name and data type.

Alternatively, the mode information and the auxiliary demodulation information may be carried in one message or may be carried in two messages, which is not limited by the embodiment of the present application.

According to the embodiment of the application, the charging symbol and the data symbol are carried on one subcarrier at the same time, so that the resource utilization rate can be improved. Because the charging symbols are interference to the data symbols on the shared subcarriers, in order for the receiving end to successfully complete data demodulation, the transmitting end of the embodiment of the application also transmits auxiliary demodulation information to help the receiving end to demodulate data, thereby realizing coexistence of wireless energy transmission and another form of data transmission.

In one possible implementation, it is assumed that a certain receiver is a receiver that only performs energy harvesting, such as certain IoT devices. Then the electromagnetic wave (such as a digital energy coexistence signal) in the air is converted into an alternating current signal through a receiver antenna of the IoT device and enters a rectifier, the rectifier rectifies and filters the alternating current signal into a direct current signal, the direct current signal is sent to a power management module of the IoT device, and finally the power management module sends the direct current signal to a battery to realize energy storage.

In another possible implementation, if the receiving end is a receiving end that needs to perform data demodulation, the receiving end includes a receiving end that only performs data demodulation, and a receiving end that needs to perform both data demodulation and energy collection. The signal processing method shown in fig. 13 further includes the steps of:

s404, the receiving end (e.g., terminal) receives one or more OFDM symbols, where the one or more OFDM symbols are carried on the same resource block, where the same resource block includes the N subcarriers, and the N subcarriers include at least one common subcarrier, and the common subcarrier carries the charging symbol and the data symbol.

S405, the receiving end (e.g., terminal) receives auxiliary demodulation information, where the auxiliary demodulation information is used to indicate an index of the at least one common subcarrier and a charging symbol carried by the at least one common subcarrier.

And S406, the receiving end (such as a terminal) demodulates the received OFDM symbols according to the auxiliary demodulation information.

Thus, for a receiving end that needs to perform both data demodulation and energy harvesting, it receives a signal that performs energy harvesting on the one hand and data demodulation on the other hand. Because the energy collection does not need demodulation, the receiving end does not need to know which sub-carriers have charging symbols and which sub-carriers are shared sub-carriers during the energy collection, and the received electromagnetic waves (i.e. signals) can be converted into alternating current signals to be sent to a rectifier, and the alternating current signals are rectified and filtered by the rectifier to be changed into direct current signals to be stored. For data demodulation, since the receiving end knows the index of the data sub-carriers, i.e. the known set C _i ^DATA And knows set C from the received auxiliary demodulation information _i ^DATA Which indexes are indexes of the shared sub-carrier and the charging symbol on the shared sub-carrier. So after receiving the signal, the receiving end can receive the signal according to the auxiliaryDemodulation-assisted information performs interference cancellation on the common subcarriers and then performs demodulation on the data symbols, for set C _i ^DATA Other subcarriers of the medium except the shared subcarrier can be directly demodulated without interference cancellation. It should be noted that any content that can eliminate the interference of the charging symbol and assist in data demodulation can be considered as a protection scope of the embodiment of the present application, and the embodiment of the present application mainly focuses on a method for assisting a receiving end in demodulating data.

The receiving end of the embodiment of the application carries out interference elimination on the shared sub-carrier according to the auxiliary demodulation information, so as to reduce the interference of the charging symbol on the shared sub-carrier on the data symbol, enable the data symbol to be correctly demodulated, reduce the influence of wireless energy transmission on the data transmission, and lay a foundation for realizing the wireless energy transmission through the base station.

The foregoing details of the method provided by the present application, and in order to facilitate implementation of the foregoing aspects of the embodiments of the present application, the embodiments of the present application further provide corresponding apparatuses or devices.

According to the method embodiment, the sending end and the receiving end are divided into the functional modules, for example, each functional module can be divided corresponding to each function, and two or more functions can be integrated into one processing module. The integrated modules may be implemented in hardware or in software functional modules. It should be noted that, the division of the modules in the present application is illustrative, and is merely a logic function division, and other division manners may be implemented in practice. The transmitting end and the receiving end of the embodiment of the present application will be described in detail with reference to fig. 15 to 17.

Referring to fig. 15, fig. 15 is a schematic structural diagram of a communication device according to an embodiment of the present application. As shown in fig. 15, the communication apparatus may include a transceiving unit 10 and a processing unit 20.

In some embodiments of the application, the communication device may be the transmitting end shown above or a chip or circuit applied in the transmitting end. I.e. the communication device may be adapted to perform the steps or functions etc. performed by the sender in the above method embodiments.

In one design, processing unit 20 may be configured to obtain one or more OFDM symbols; a transceiver unit 10 for transmitting one or more OFDM symbols. The one or more OFDM symbols are carried on the same resource block, the same resource block includes N subcarriers, the N subcarriers include M charging subcarriers and K data subcarriers, an intersection of the M charging subcarriers and the K data subcarriers is an empty set, the charging subcarriers carry charging symbols, and the data subcarriers are used for carrying data symbols. Wherein, N, M and K are positive integers.

In the embodiments of the present application, reference may be made to the description of the first and second embodiments of the above method (including fig. 4, fig. 8, etc.) for descriptions of OFDM symbols, subcarriers, charging symbols, and data symbols, etc., which are not described in detail herein.

It should be understood that the specific descriptions of the transceiver unit and the processing unit shown in the embodiments of the present application are merely examples, and reference may be made to the first and second method embodiments for specific functions or steps performed by the transceiver unit and the processing unit, which are not described in detail herein.

In another design, the processing unit 20 is configured to obtain a data sub-signal, where the data sub-signal includes an OFDM symbol, where the OFDM symbol is carried on a resource block, where the resource block includes M consecutive subcarriers and K data subcarriers, where the K data subcarriers carry data symbols, where the M consecutive subcarriers are used to carry charging sub-signals, and where M and K are positive integers; a transceiver unit 10, configured to transmit a signal, where the signal includes the charging sub-signal and the data sub-signal, and a frequency range of the M consecutive sub-carriers includes a frequency range of the charging sub-signal.

In the embodiment of the present application, reference is made to the description of the third embodiment of the method (fig. 10) above for the description of the data sub-signal, the charging sub-signal, the OFDM symbol, the sub-carrier, etc., which are not described in detail here.

It is to be understood that the specific descriptions of the transceiver unit and the processing unit shown in the embodiments of the present application are merely examples, and reference may be made to the third embodiment of the method described above for specific functions or steps performed by the transceiver unit and the processing unit, and will not be described in detail herein.

In yet another design, processing unit 20 may be configured to obtain one or more OFDM symbols; a transceiver unit 10, configured to transmit one or more OFDM symbols, where the one or more OFDM symbols are carried on a same resource block, where the same resource block includes N subcarriers, and the N subcarriers include at least one common subcarrier, and the common subcarrier carries a charging symbol and a data symbol; the transceiver unit 10 is further configured to send auxiliary demodulation information, where the auxiliary demodulation information is used to indicate an index of the at least one common subcarrier and a charging symbol carried by the at least one common subcarrier. N is a positive integer.

In the embodiments of the present application, reference may be made to the description in the fourth embodiment of the method (fig. 13) above for descriptions of OFDM symbols, common subcarriers, charging symbols, and data symbols, and so on, which are not described in detail herein.

It is to be understood that the specific descriptions of the transceiver unit and the processing unit shown in the embodiments of the present application are merely examples, and reference may be made to the fourth embodiment of the method described above for specific functions or steps performed by the transceiver unit and the processing unit, which are not described in detail herein.

Multiplexing fig. 15, in other embodiments of the application, the communication device may be the receiving end shown above or a chip or circuit applied in the receiving end. I.e. the communication device may be adapted to perform the steps or functions etc. performed by the receiving end in the above method embodiments.

In one design, the transceiver unit 10 is configured to receive one or more OFDM symbols, where the one or more OFDM symbols are carried on a same resource block, where the same resource block includes N subcarriers, where the N subcarriers include M charging subcarriers and K data subcarriers, where an intersection between the M charging subcarriers and the K data subcarriers is an empty set, where the charging subcarriers carry charging symbols, and where the data subcarriers are used to carry data symbols; a processing unit 20, configured to demodulate the K data subcarriers. Wherein, N, M and K are positive integers.

In another design, the transceiver unit 10 is configured to receive a signal, where the signal includes a charging sub-signal and a data sub-signal, where the data sub-signal includes an OFDM symbol, where the OFDM symbol is carried on a resource block, where the resource block includes M consecutive subcarriers and K data subcarriers, where the K data subcarriers carry data symbols, where the M consecutive subcarriers are used to carry the charging sub-signal, and where a frequency range of the M consecutive subcarriers includes a frequency range of the charging sub-signal; a processing unit 20 for demodulating the data sub-signal. M and K are positive integers.

In yet another design, the transceiver unit 10 is configured to receive one or more OFDM symbols, where the one or more OFDM symbols are carried on a same resource block, where the same resource block includes N subcarriers, and the N subcarriers include at least one common subcarrier, and the common subcarrier carries a charging symbol and a data symbol; the transceiver unit 10 is further configured to receive auxiliary demodulation information, where the auxiliary demodulation information is used to indicate an index of the at least one common subcarrier and a charging symbol carried by the at least one common subcarrier; a processing unit 20, configured to demodulate the one or more OFDM symbols according to the auxiliary demodulation information. N is a positive integer.

The transmitting end and the receiving end of the embodiment of the application are described above, and possible product forms of the transmitting end and the receiving end are described below. It should be understood that any form of product having the functions of the communication device described in fig. 15 falls within the scope of the embodiments of the present application. It should also be understood that the following description is only exemplary, and not limiting the product forms of the transmitting end and the receiving end in the embodiments of the present application.

In a possible implementation, in the communication apparatus shown in fig. 15, the processing unit 20 may be one or more processors, the transceiver unit 10 may be a transceiver, or the transceiver unit 10 may also be a transmitting unit and a receiving unit, the transmitting unit may be a transmitter, and the receiving unit may be a receiver, where the transmitting unit and the receiving unit are integrated into one device, such as a transceiver. In the embodiment of the present application, the processor and the transceiver may be coupled, etc., and the embodiment of the present application is not limited to the connection manner of the processor and the transceiver. In performing the above method, the process of transmitting information (or signals, or OFDM symbols) in the above method may be understood as a process of outputting the above information (or signals, or OFDM symbols) by a processor. When outputting the information (or signal, or OFDM symbol), the processor outputs the information (or signal, or OFDM symbol) to the transceiver for transmission by the transceiver. The information (or signal, or OFDM symbol) may also need to be processed further after being output by the processor before reaching the transceiver. Similarly, the process of receiving information (or signals, or OFDM symbols) in the above method may be understood as a process in which a processor receives input of the above information (or signals, or OFDM symbols). When the processor receives the input information (or signal, or OFDM symbol), the transceiver receives the information (or signal, or OFDM symbol) and inputs it to the processor. Further, after the transceiver receives the information (or signal, or OFDM symbol), the information (or signal, or OFDM symbol) may need to be processed and then input to the processor.

Referring to fig. 16, fig. 16 is another schematic structural diagram of a communication device according to an embodiment of the present application. The communication device may be a transmitting end, a receiving end, or a chip therein. Fig. 16 shows only the main components of the communication device. The communication device may further comprise a memory 1003, and input-output means (not shown) in addition to the processor 1001 and the transceiver 1002.

The processor 1001 is mainly used for processing communication protocols and communication data, controlling the entire communication apparatus, executing software programs, and processing data of the software programs. The memory 1003 is mainly used for storing software programs and data. The transceiver 1002 may include a control circuit and an antenna, the control circuit being mainly used for conversion of baseband signals and radio frequency signals and processing of radio frequency signals. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are mainly used for receiving data input by a user and outputting data to the user.

When the communication device is powered on, the processor 1001 may read the software program in the memory 1003, interpret and execute instructions of the software program, and process data of the software program. When data needs to be transmitted wirelessly, the processor 1001 performs baseband processing on the data to be transmitted, and outputs a baseband signal to the radio frequency circuit, and the radio frequency circuit performs radio frequency processing on the baseband signal and then transmits the radio frequency signal to the outside in the form of electromagnetic waves through the antenna. When data is transmitted to the communication device, the radio frequency circuit receives a radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor 1001, and the processor 1001 converts the baseband signal into data and processes the data.

In another implementation, the radio frequency circuitry and antenna may be provided separately from the processor performing the baseband processing, e.g., in a distributed scenario, the radio frequency circuitry and antenna may be in a remote arrangement from the communication device.

The transceiver 1002 may include a receiver to perform the functions (or operations) of receiving and a transmitter to perform the functions (or operations) of transmitting. And transceivers are used to communicate with other devices/means via transmission media.

The processor 1001, the transceiver 1002, and the memory 1003 may be connected by a communication bus.

Illustratively, when the communications apparatus is configured to perform the steps or methods or functions performed by the transmitting end in the above-described embodiment one, the processor 1001 is configured to obtain a plurality of OFDM symbols; transceiver 1002 is configured to transmit one or more OFDM symbols. The one or more OFDM symbols are carried on the same resource block, the same resource block includes N subcarriers, the N subcarriers include M charging subcarriers and K data subcarriers, an intersection of the M charging subcarriers and the K data subcarriers is an empty set, the charging subcarriers carry charging symbols, and the data subcarriers are used for carrying data symbols. Wherein, N, M and K are positive integers.

For example, when the communication device is configured to perform the steps or the methods or the functions performed by the receiving end in the above embodiment one, the transceiver 1002 is configured to receive one or more OFDM symbols, where the one or more OFDM symbols are carried on a same resource block, the same resource block includes the N subcarriers, where the N subcarriers include M charging subcarriers and K data subcarriers, an intersection of the M charging subcarriers and the K data subcarriers is an empty set, the charging subcarriers carry charging symbols, and the data subcarriers are configured to carry data symbols; the processor 1001 is configured to demodulate the K data subcarriers. Wherein, N, M and K are positive integers.

In the embodiments of the present application, reference may be made to the description of the first embodiment of the method (fig. 4) above for descriptions of OFDM symbols, subcarriers, charging symbols, and data symbols, which are not described in detail herein. It will be appreciated that the specific description of the processor and transceiver may also refer to the description of the processing unit and transceiver unit shown in fig. 15, and will not be repeated here.

Illustratively, when the communications apparatus is configured to perform the steps or methods or functions performed by the transmitting end in the second embodiment, the processor 1001 is configured to obtain one OFDM symbol; the transceiver 1002 is configured to transmit the OFDM symbol, where the OFDM symbol is carried on a resource block, and the resource block includes N subcarriers, where the N subcarriers include M charging subcarriers and K data subcarriers, an intersection of the M charging subcarriers and the K data subcarriers is an empty set, the charging subcarriers carry charging symbols, and the data subcarriers are used to carry data symbols. Wherein N, M, K are all positive integers.

For example, when the communication device is configured to perform the steps or the methods or the functions performed by the receiving end in the second embodiment, the transceiver 1002 is configured to receive an OFDM symbol, where the OFDM symbol is carried on a resource block, the resource block includes the N subcarriers, where the N subcarriers include M charging subcarriers and K data subcarriers, an intersection of the M charging subcarriers and the K data subcarriers is a null set, the charging subcarriers carry charging symbols, and the data subcarriers are configured to carry data symbols; the processor 1001 is configured to demodulate the K data subcarriers. Wherein N, M, K are all positive integers.

In the embodiment of the present application, reference may be made to the description in the second embodiment of the method (fig. 8) above for descriptions of OFDM symbols, subcarriers, charging symbols, and data symbols, which are not described in detail herein. It will be appreciated that the specific description of the processor and transceiver may also refer to the description of the processing unit and transceiver unit shown in fig. 15, and will not be repeated here.

Illustratively, when the communication device is configured to perform the steps or the methods or the functions performed by the transmitting end in the third embodiment, the processor 1001 is configured to obtain a charging sub-signal and a data sub-signal, where the data sub-signal includes an OFDM symbol, and the OFDM symbol is carried on a resource block, and the resource block includes M consecutive subcarriers and K data subcarriers, where the K data subcarriers carry data symbols, and the M consecutive subcarriers are used to carry the charging sub-signal; transceiver 1002 is configured to transmit a signal comprising the charging sub-signal and the data sub-signal, the frequency range of the M consecutive sub-carriers comprising the frequency range of the charging sub-signal. Wherein M and K are positive integers.

Illustratively, when the communication device is configured to perform the steps or the methods or the functions performed by the receiving end in the third embodiment, the transceiver 1002 is configured to receive a signal, where the signal includes the charging sub-signal and the data sub-signal, where the data sub-signal includes an OFDM symbol, where the OFDM symbol is carried on a resource block, where the resource block includes M consecutive subcarriers and K data subcarriers, where the K data subcarriers carry data symbols, where the M consecutive subcarriers are used to carry the charging sub-signal, and where a frequency range of the M consecutive subcarriers includes a frequency range of the charging sub-signal; the processor 1001 is configured to demodulate the data subsignals. Wherein M and K are positive integers.

In the embodiment of the present application, reference is made to the description of the third embodiment of the method (fig. 10) above for the description of the data sub-signal, the charging sub-signal, the OFDM symbol, the sub-carrier, etc., which are not described in detail here. It will be appreciated that the specific description of the processor and transceiver may also refer to the description of the processing unit and transceiver unit shown in fig. 15, and will not be repeated here.

Illustratively, when the communications apparatus is configured to perform the steps or methods or functions performed by the transmitting end in the above-described fourth embodiment, the processor 1001 is configured to obtain one or more OFDM symbols; the transceiver 1002 is configured to transmit one or more OFDM symbols, where the one or more OFDM symbols are carried on a same resource block, the same resource block containing the N subcarriers, the N subcarriers including at least one common subcarrier, the common subcarrier carrying a charging symbol and a data symbol; transceiver 1002 is also configured to transmit auxiliary demodulation information indicating an index of the at least one common subcarrier and a charging symbol carried by the at least one common subcarrier. N is a positive integer.

Illustratively, when the communications apparatus is configured to perform the steps or methods or functions performed by the receiving end in the fourth embodiment, the transceiver 1002 is configured to receive one or more OFDM symbols, where the one or more OFDM symbols are carried on a same resource block, the same resource block includes the N subcarriers, and the N subcarriers include at least one common subcarrier, and the common subcarrier carries a charging symbol and a data symbol; transceiver 1002 is further configured to receive auxiliary demodulation information, where the auxiliary demodulation information is configured to indicate an index of the at least one common subcarrier and a charging symbol carried by the at least one common subcarrier; processor 1001 is configured to demodulate one or more received OFDM symbols according to the auxiliary demodulation information. N is a positive integer.

In the embodiments of the present application, reference may be made to the description in the fourth embodiment of the method (fig. 13) above for descriptions of OFDM symbols, common subcarriers, charging symbols, and data symbols, and so on, which are not described in detail herein. It will be appreciated that the specific description of the processor and transceiver may also refer to the description of the processing unit and transceiver unit shown in fig. 15, and will not be repeated here.

Optionally, a transceiver for implementing the receiving and transmitting functions may be included in the processor 1001. For example, the transceiver may be a transceiver circuit, or an interface circuit. The transceiver circuitry, interface or interface circuitry for implementing the receive and transmit functions may be separate or may be integrated. The transceiver circuit, interface or interface circuit may be used for reading and writing codes/data, or the transceiver circuit, interface or interface circuit may be used for transmitting or transferring signals.

Alternatively, the processor 1001 may store instructions, which may be a computer program, that runs on the processor 1001 and that causes the communication device to execute the method described in the above method embodiment. The computer program may be solidified in the processor 1001, in which case the processor 1001 may be implemented in hardware.

In one implementation, a communication device may include circuitry that may implement the functions of transmitting or receiving or communicating in the foregoing method embodiments. The processors and transceivers described in the present application may be implemented on integrated circuits (integrated circuit, ICs), analog ICs, wireless radio frequency integrated circuits (radio frequency integrated circuit, RFIC), mixed signal ICs, application specific integrated circuits (application specific integrated circuit, ASIC), printed circuit boards (printed circuit board, PCB), electronics, and the like. The processor and transceiver may also be fabricated using a variety of IC process technologies such as complementary metal oxide semiconductor (complementary metal oxide semiconductor, CMOS), N-type metal oxide semiconductor (NMOS), P-channel metal oxide semiconductor (positive channel metal oxide semiconductor, PMOS), bipolar junction transistor (bipolar junction transistor, BJT), bipolar CMOS (BiCMOS), silicon germanium (SiGe), gallium arsenide (GaAs), etc.

It will be appreciated that the communication device shown in the embodiment of the present application may also have more components than those shown in fig. 16, and the embodiment of the present application is not limited thereto. The methods performed by the processors and transceivers shown above are merely examples, and reference may be made to the description of the method embodiments above for specific steps performed by the processors and transceivers.

In another possible implementation, in the communication device shown in fig. 15, the processing unit 20 may be one or more logic circuits, and the transceiver unit 10 may be an input-output interface, which is also referred to as a communication interface, or an interface circuit, or an interface, or the like. Alternatively, the transceiver unit 10 may be a transmitting unit and a receiving unit, the transmitting unit may be an output interface, and the receiving unit may be an input interface, and the transmitting unit and the receiving unit are integrated into one unit, for example, the input/output interface. Referring to fig. 17, fig. 17 is a schematic diagram of still another structure of a communication device according to an embodiment of the present application. As shown in fig. 17, the communication apparatus shown in fig. 17 includes a logic circuit 901 and an interface 902. That is, the processing unit 20 may be implemented by a logic circuit 901, and the transceiver unit 10 may be implemented by an interface 902. The logic circuit 901 may be a chip, a processing circuit, an integrated circuit, or a system on chip (SoC) chip, and the interface 902 may be a communication interface, an input/output interface, a pin, or the like. Fig. 17 exemplifies the communication device described above as a chip including a logic circuit 901 and an interface 902.

In the embodiment of the application, the logic circuit and the interface can be coupled with each other. The embodiment of the present application is not limited to the specific connection manner of the logic circuit and the interface.

In the embodiments of the present application, reference may be made to the description of the first embodiment of the method (fig. 4) above for descriptions of OFDM symbols, subcarriers, charging symbols, and data symbols, which are not described in detail herein. It is to be understood that the specific description of the logic circuit 901 and the interface 902 may refer to the description of the processing unit and the transceiver unit shown in fig. 15, and will not be repeated herein.

Illustratively, when the communication device is configured to perform the steps or methods or functions performed by the transmitting end in the above-described second embodiment, the logic circuit 901 is configured to obtain one OFDM symbol; the interface 902 is configured to send the OFDM symbol, where the OFDM symbol is carried on a resource block, and the resource block includes N subcarriers, where the N subcarriers include M charging subcarriers and K data subcarriers, an intersection of the M charging subcarriers and the K data subcarriers is an empty set, the charging subcarriers carry charging symbols, and the data subcarriers are used to carry data symbols. Wherein N, M, K are all positive integers.

For example, when the communication device is configured to perform the steps or the methods or the functions performed by the receiving end in the second embodiment, the interface 902 is configured to receive an OFDM symbol, where the OFDM symbol is carried on a resource block, the resource block includes the N subcarriers, where the N subcarriers include M charging subcarriers and K data subcarriers, an intersection of the M charging subcarriers and the K data subcarriers is a null set, the charging subcarriers carry charging symbols, and the data subcarriers are configured to carry data symbols; logic 901 is used to demodulate the K data subcarriers. Wherein N, M, K are all positive integers.

In the embodiment of the present application, reference may be made to the description in the second embodiment of the method (fig. 8) above for descriptions of OFDM symbols, subcarriers, charging symbols, and data symbols, which are not described in detail herein. It is to be understood that the specific description of the logic circuit 901 and the interface 902 may refer to the description of the processing unit and the transceiver unit shown in fig. 15, and will not be repeated herein.

For example, when the communication device is configured to perform the steps or the methods or the functions performed by the transmitting end in the third embodiment, the logic circuit 901 is configured to obtain a charging sub-signal and a data sub-signal, where the data sub-signal includes an OFDM symbol, and the OFDM symbol is carried on a resource block, and the resource block includes M consecutive subcarriers and K data subcarriers, where the K data subcarriers carry data symbols, and the M consecutive subcarriers are used to carry the charging sub-signal; the interface 902 is configured to transmit a signal, where the signal includes the charging sub-signal and the data sub-signal, and where the frequency range of the M consecutive sub-carriers includes the frequency range of the charging sub-signal. Wherein M and K are positive integers.

For example, when the communication apparatus is configured to perform the steps or the methods or the functions performed by the receiving end in the third embodiment, the interface 902 is configured to receive a signal, where the signal includes the charging sub-signal and the data sub-signal, where the data sub-signal includes an OFDM symbol, where the OFDM symbol is carried on a resource block, where the resource block includes M consecutive subcarriers and K data subcarriers, where the K data subcarriers carry data symbols, where the M consecutive subcarriers are used to carry the charging sub-signal, and where a frequency range of the M consecutive subcarriers includes a frequency range of the charging sub-signal; logic circuit 901 is used to demodulate the data sub-signals. Wherein M and K are positive integers.

In the embodiment of the present application, reference is made to the description of the third embodiment of the method (fig. 10) above for the description of the data sub-signal, the charging sub-signal, the OFDM symbol, the sub-carrier, etc., which are not described in detail here. It is to be understood that the specific description of the logic circuit 901 and the interface 902 may refer to the description of the processing unit and the transceiver unit shown in fig. 15, and will not be repeated herein.

Illustratively, when the communications apparatus is configured to perform the steps or methods or functions performed by the transmitting end in the fourth embodiment, the logic 901 is configured to obtain one or more OFDM symbols; the interface 902 is configured to send one or more OFDM symbols, where the one or more OFDM symbols are carried on a same resource block, where the same resource block includes the N subcarriers, where the N subcarriers include at least one common subcarrier, and where the common subcarrier carries a charging symbol and a data symbol; interface 902 is further configured to transmit auxiliary demodulation information for indicating an index of the at least one common subcarrier and a charging symbol carried by the at least one common subcarrier. N is a positive integer.

Illustratively, when the communications apparatus is configured to perform the steps or methods or functions performed by the receiving end in the fourth embodiment, the interface 902 is configured to receive one or more OFDM symbols, where the one or more OFDM symbols are carried on a same resource block, the same resource block includes the N subcarriers, and the N subcarriers include at least one common subcarrier, and the common subcarrier carries a charging symbol and a data symbol; interface 902 is further configured to receive auxiliary demodulation information, where the auxiliary demodulation information is configured to indicate an index of the at least one common subcarrier and a charging symbol carried by the at least one common subcarrier; logic 901 is configured to demodulate the received one or more OFDM symbols based on the auxiliary demodulation information. N is a positive integer.

In the embodiments of the present application, reference may be made to the description in the fourth embodiment of the method (fig. 13) above for descriptions of OFDM symbols, common subcarriers, charging symbols, and data symbols, and so on, which are not described in detail herein. It is to be understood that the specific description of the logic circuit 901 and the interface 902 may refer to the description of the processing unit and the transceiver unit shown in fig. 15, and will not be repeated herein.

It may be understood that the communication device shown in the embodiment of the present application may implement the method provided in the embodiment of the present application in a hardware manner, or may implement the method provided in the embodiment of the present application in a software manner, which is not limited to this embodiment of the present application.

Reference may also be made to the above embodiments for a specific implementation of the embodiments shown in fig. 17, which are not described in detail herein.

The embodiment of the application also provides a communication system, which comprises a transmitting end and a receiving end, wherein the transmitting end and the receiving end can be used for executing the method in any of the previous embodiments (fig. 4 or 8 or 10 or 13).

Furthermore, the present application provides a computer program for implementing the operations and/or processes performed by the transmitting end in the method provided by the present application.

The present application also provides a computer program for implementing the operations and/or processes performed by the receiving end in the method provided by the present application.

The present application also provides a computer readable storage medium having computer code stored therein, which when run on a computer causes the computer to perform the operations and/or processes performed by a transmitting end in the method provided by the present application.

The present application also provides a computer readable storage medium having computer code stored therein, which when run on a computer causes the computer to perform the operations and/or processes performed by a receiving end in the method provided by the present application.

The present application also provides a computer program product comprising computer code or a computer program which, when run on a computer, causes the operations and/or processes performed by the sender in the method provided by the present application to be performed.

The present application also provides a computer program product comprising computer code or a computer program which, when run on a computer, causes operations and/or processes performed by a receiving end in a method provided by the present application to be performed.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices, or elements, or may be an electrical, mechanical, or other form of connection.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the technical effects of the scheme provided by the embodiment of the application.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application is essentially or a part contributing to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a readable storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned readable storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a random access memory (random access memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A signal processing method, comprising:

obtaining one or more orthogonal frequency division multiplexing, OFDM, symbols;

one or more OFDM symbols are sent, the one or more OFDM symbols are carried on the same resource block, the same resource block comprises N subcarriers, the N subcarriers comprise M energy charging subcarriers and K data subcarriers, the intersection of the M energy charging subcarriers and the K data subcarriers is an empty set, the energy charging subcarriers carry energy charging symbols, and the data subcarriers are used for carrying data symbols, and N, M and K are all positive integers.

2. The method of claim 1, wherein the one or more OFDM symbols are carried on the same resource, comprising:

part of information of one OFDM symbol is carried on K data subcarriers, and the other part of information is carried on M charging subcarriers;

Alternatively, a portion of the plurality of OFDM symbols is carried on K data subcarriers and another portion of the plurality of OFDM symbols is carried on M charging subcarriers.

3. A method according to claim 1 or 2, wherein the charging symbols are predefined symbols; or the charging symbol is obtained by preprocessing a predefined symbol, wherein the preprocessing comprises amplitude and/or phase adjustment.

4. A method according to claim 3, wherein the predefined symbols satisfy one or more of the following:

wherein the phase of each predefined symbol +.>The same and a predefined value;

wherein the phase of each predefined symbol +.>Respectively predefined values;

in which the amplitude a of the predefined symbol _i,k And/or phase b _i,k Belonging toA predefined random distribution;

the value of k is the index of the M charge sub-carriers, i represents the OFDM symbol at the ith moment, X _i,k Representing a predefined symbol corresponding to a charged subcarrier with index k in the OFDM symbol at the i-th time.

5. A method according to claim 1 or 2, characterized in that the charging symbols are obtained after modulation of charging bits in a charging bit sequence or that the charging symbols are obtained after modulation of charging bits in a charging bit sequence and then a pre-processing, said pre-processing comprising an adjustment of amplitude and/or phase.

6. The method according to claim 1 or 2, wherein the charging symbols are charging time domain symbols obtained by fast fourier transform; or the energy charging symbol is obtained by carrying out fast Fourier transform on an energy charging time domain symbol and then carrying out pretreatment, wherein the pretreatment comprises adjustment of amplitude and/or phase;

the charging time domain symbol is obtained by sampling and amplitude shift keying ASK modulation of a predefined charging waveform, and the sampling point number of the sampling is M.

7. The method of any of claims 1-6, wherein a portion of the plurality of OFDM symbols is processed by a first power amplifier and transmitted at a same time as another portion of the plurality of OFDM symbols is processed by a second power amplifier, the first power amplifier and the second power amplifier being different.

8. The method of claim 5, wherein the sequence of charging bits is any one of: a sequence of all 1's elements, a sequence of all 0's elements, or a random binary sequence.

9. The method of claim 6, wherein the predefined charging waveform comprises one or more of: noise signals, chaotic signals, triangular waves, pulsed waves, or multitone signals.

10. A signal processing method, comprising:

receiving one or more OFDM symbols, wherein the one or more OFDM symbols are borne on the same resource block, the same resource block comprises N subcarriers, the N subcarriers comprise M energy charging subcarriers and K data subcarriers, the intersection of the M energy charging subcarriers and the K data subcarriers is an empty set, the energy charging subcarriers carry energy charging symbols, and the data subcarriers are used for carrying data symbols, and N, M and K are all positive integers;

demodulating the K data subcarriers.

11. A signal processing method, comprising:

obtaining a data sub-signal, wherein the data sub-signal comprises an OFDM symbol, the OFDM symbol is borne on a resource block, the resource block comprises M continuous sub-carriers and K data sub-carriers, the K data sub-carriers carry the data symbol, the M continuous sub-carriers are used for bearing a charging sub-signal, and M and K are positive integers;

and transmitting a signal, wherein the signal comprises the charging sub-signal and the data sub-signal, and the frequency range of the M continuous subcarriers comprises the frequency range of the charging sub-signal.

12. The method of claim 11, wherein the charge sub-signal is obtained by preprocessing a charge symbol sequence, and wherein the preprocessing includes limiting a frequency spectrum of the charge symbol sequence to a certain range;

the charging symbol sequence is obtained by sampling and amplitude shift keying ASK modulation of a predefined charging waveform, and the sampling point number of the sampling is N.

13. The method of claim 12, wherein the preprocessing comprises windowing, wherein the frequency width of the window is less than or equal to the product of M and the subcarrier spacing Δf.

14. The method according to claim 12 or 13, wherein the resource block further comprises a number of delta guard subcarriers, the delta guard subcarriers being used to separate the M consecutive subcarriers from the data subcarriers.

15. The method of any one of claims 12 to 14, wherein the predefined charging waveform comprises one or more of: noise signals, chaotic signals, triangular waves, pulsed waves, or multitone signals.

16. A signal processing method, comprising:

receiving a signal, wherein the signal comprises a charge sub-signal and a data sub-signal, the data sub-signal comprises an OFDM symbol, the OFDM symbol is borne on a resource block, the resource block comprises M continuous sub-carriers and K data sub-carriers, the K data sub-carriers carry the data symbol, the M continuous sub-carriers are used for bearing the charge sub-signal, and the frequency range of the M continuous sub-carriers comprises the frequency range of the charge sub-signal; m and K are positive integers;

Demodulating the data sub-signals.

17. A communication device comprising means or units for performing the method of any one of claims 1 to 9 or 11 to 15.

18. A communication device comprising means or units for performing the method of claim 10 or 16.

19. A communication device, comprising:

one or more processors coupled with the one or more memories;

wherein the one or more memories are for storing computer programs, the one or more processors are for executing the computer programs stored in the one or more memories to cause the communication apparatus to perform the method of any of claims 1-16.

20. A readable storage medium storing a program for execution by one or more processors, the program causing an apparatus comprising the one or more processors to perform the method of any one of claims 1 to 16.

21. A communication system, comprising: means for performing the method of any one of claims 1 to 9, and means for performing the method of claim 10;

Alternatively, an apparatus for use in the method of any one of claims 11 to 15, and an apparatus for performing the method of claim 16.