CN117978594A

CN117978594A - Signal processing method and device and communication equipment

Info

Publication number: CN117978594A
Application number: CN202211303924.XA
Authority: CN
Inventors: 刘劲; 刘昊; 袁璞; 史斯豪; 孙布勒
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2022-10-24
Filing date: 2022-10-24
Publication date: 2024-05-03

Abstract

The application discloses a signal processing method, a device and communication equipment, which belong to the technical field of communication, and the signal processing method of the embodiment of the application comprises the following steps: the transmitting device converts the delay Doppler signal into a frequency domain signal; the sending equipment adds a cyclic prefix and/or a cyclic suffix to the frequency domain signal to obtain a processed frequency domain signal; and the transmitting equipment obtains and transmits a time domain signal according to the processed frequency domain signal.

Description

Signal processing method and device and communication equipment

Technical Field

The present application belongs to the technical field of communications, and in particular, relates to a signal processing method, a signal processing device, and a communication device.

Background

In the related art, doppler Shift (Doppler Shift) refers to a change in phase and frequency due to a propagation path difference when a mobile station moves in a certain direction at a constant rate, and such a change is generally referred to as Doppler Shift. It reveals the law of variation of the properties of the wave in motion. The doppler effect can cause the spectrum of the received signal to shift left or right, as shown in fig. 2. In the prior art, the equalization detection is performed according to the sampling rate of the constellation symbol, so that if the sampling bandwidth is still the reference center carrier frequency, some frequency spectrums which are shifted out of the bandwidth range due to Doppler influence are lost, and the receiving performance is influenced. In future communications, the carrier frequency may be extended to millimeter waves or even terahertz, the moving speed of the communications device may be faster, and the effect of the doppler effect may be more obvious.

Disclosure of Invention

The embodiment of the application provides a signal processing method, a signal processing device and communication equipment, which can solve the problem of poor receiving performance caused by Doppler effect in a future communication system.

In a first aspect, a signal processing method is provided, including:

The transmitting device converts the delay Doppler signal into a frequency domain signal;

the sending equipment adds a cyclic prefix and/or a cyclic suffix to the frequency domain signal to obtain a processed frequency domain signal;

and the transmitting equipment obtains and transmits a time domain signal according to the processed frequency domain signal.

In a second aspect, there is provided a signal processing apparatus applied to a transmitting device, including:

The first processing module is used for converting the delay Doppler signal into a frequency domain signal;

the second processing module is used for adding a cyclic prefix and/or a cyclic suffix to the frequency domain signal to obtain a processed frequency domain signal;

and the third processing module is used for obtaining and sending a time domain signal according to the processed frequency domain signal.

In a third aspect, a communication device is provided, the communication device being a terminal or network side device, the communication device comprising a processor and a memory storing a program or instructions executable on the processor, the program or instructions implementing the steps of the method according to the first aspect when executed by the processor.

In a fourth aspect, a communication device is provided, where the communication device is a terminal or a network side device, and includes a processor and a communication interface, where the processor is configured to transform a delay-doppler signal into a frequency domain signal; adding a cyclic prefix and/or a cyclic suffix to the frequency domain signal to obtain a processed frequency domain signal; obtaining a time domain signal according to the processed frequency domain signal; the communication interface is used for transmitting time domain signals.

In a fifth aspect, there is provided a readable storage medium having stored thereon a program or instructions which when executed by a processor realizes the steps of the method according to the first aspect.

In a sixth aspect, there is provided a chip comprising a processor and a communication interface coupled to the processor for running a program or instructions to implement the method of the first aspect.

In a seventh aspect, there is provided a computer program/program product stored in a storage medium, the computer program/program product being executed by at least one processor to carry out the steps of the method according to the first aspect.

In an embodiment of the application, a transmitting device pair transforms a delay-doppler signal into a frequency domain signal; adding a cyclic prefix and/or a cyclic suffix to the frequency domain signal to obtain a processed frequency domain signal; and obtaining a time domain signal according to the processed frequency domain signal and sending the time domain signal. In the embodiment of the application, the cyclic prefix and/or cyclic postfix addition processing is carried out on the frequency domain signal, namely, part of signals at the tail of the subcarrier are copied to the head of the subcarrier and/or part of signals at the head of the subcarrier are copied to the tail of the subcarrier, and when Doppler frequency shift occurs, the effective signals can be effectively prevented from deviating from the receiving bandwidth, thereby effectively improving the receiving performance.

Drawings

Fig. 1 is a block diagram showing a communication system to which an embodiment of the present application is applicable;

Fig. 2 shows a schematic diagram of left or right shift of frequency offset caused by doppler effect;

FIG. 3 shows a schematic diagram of an OTFS implementation based on an OFDM system;

FIG. 4 is a flow chart of a signal processing method according to an embodiment of the application;

fig. 5 shows a block diagram of a signal processing method according to an embodiment of the present application;

FIG. 6 shows a circular convolution schematic of a conventional OTFS in the delay domain;

FIG. 7 shows a schematic of cyclic convolution with addition of cyclic prefix OR in the delay domain;

fig. 8 shows a schematic block diagram of a signal processing apparatus according to an embodiment of the present application;

Fig. 9 is a block diagram showing the configuration of a communication apparatus according to an embodiment of the present application;

fig. 10 is a block diagram showing the structure of a terminal according to an embodiment of the present application;

fig. 11 is a block diagram of a network device according to an embodiment of the present application.

Detailed Description

The technical solutions of the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the application, fall within the scope of protection of the application.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or otherwise described herein, and that the "first" and "second" distinguishing between objects generally are not limited in number to the extent that the first object may, for example, be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/" generally means a relationship in which the associated object is an "or" before and after.

It should be noted that the techniques described in the embodiments of the present application are not limited to long term evolution (Long Term Evolution, LTE)/LTE evolution (LTE-Advanced, LTE-a) systems, but may also be used in other wireless communication systems, such as code division multiple access (Code Division Multiple Access, CDMA), time division multiple access (Time Division Multiple Access, TDMA), frequency division multiple access (Frequency Division Multiple Access, FDMA), orthogonal frequency division multiple access (Orthogonal Frequency Division Multiple Access, OFDMA), single carrier frequency division multiple access (Single-carrier Frequency Division Multiple Access, SC-FDMA), and other systems. The terms "system" and "network" in embodiments of the application are often used interchangeably, and the techniques described may be used for both the above-mentioned systems and radio technologies, as well as other systems and radio technologies. The following description describes a New Radio (NR) system for exemplary purposes and NR terminology is used in much of the following description, but these techniques may also be applied to applications other than NR system applications, such as 6 th Generation (6G) communication systems.

Fig. 1 shows a block diagram of a wireless communication system to which an embodiment of the present application is applicable. The wireless communication system includes a terminal 11 and a network device 12. The terminal 11 may be a Mobile phone, a tablet Computer (Tablet Personal Computer), a Laptop (Laptop Computer) or a terminal-side device called a notebook, a Personal digital assistant (Personal DIGITAL ASSISTANT, PDA), a palm Computer, a netbook, an ultra-Mobile Personal Computer (ultra-Mobile Personal Computer, UMPC), a Mobile internet appliance (Mobile INTERNET DEVICE, MID), an augmented reality (augmented reality, AR)/Virtual Reality (VR) device, a robot, a wearable device (Wearable Device), a vehicle-mounted device (VUE), a pedestrian terminal (PUE), a smart home (home device with a wireless communication function, such as a refrigerator, a television, a washing machine, a furniture, etc.), a game machine, a Personal Computer (Personal Computer, a PC), a teller machine, or a self-service machine, etc., and the wearable device includes: intelligent wrist-watch, intelligent bracelet, intelligent earphone, intelligent glasses, intelligent ornament (intelligent bracelet, intelligent ring, intelligent necklace, intelligent anklet, intelligent foot chain etc.), intelligent wrist strap, intelligent clothing etc.. It should be noted that the specific type of the terminal 11 is not limited in the embodiment of the present application. The network-side device 12 may include an access network device or a core network device, where the access network device 12 may also be referred to as a radio access network device, a radio access network (Radio Access Network, RAN), a radio access network function, or a radio access network element. Access network device 12 may include a base station, a WLAN access Point, a WiFi node, or the like, which may be referred to as a node B, an evolved node B (eNB), an access Point, a base transceiver station (Base Transceiver Station, BTS), a radio base station, a radio transceiver, a Basic service set (Basic SERVICE SET, BSS), an Extended service set (Extended SERVICE SET, ESS), a home node B, a home evolved node B, a transmission and reception Point (TRANSMITTING RECEIVING Point, TRP), or some other suitable terminology in the art, and the base station is not limited to a particular technical vocabulary so long as the same technical effect is achieved, and it should be noted that in the embodiment of the present application, only a base station in an NR system is described as an example, and the specific type of the base station is not limited.

The following description is presented to enable one skilled in the art to better understand the embodiments of the present application.

Delay-doppler domain modulation logically maps information in a data packet of size mxn, e.g., quadrature amplitude modulation (Quadrature Amplitude Modulation, QAM) symbols, into one mxn trellis point on a two-dimensional delay-doppler plane, i.e., the pulses within each trellis point modulate one QAM symbol in the data packet. And then transforming the data set on the MxN delay Doppler domain plane into a time domain transmission data set through specific basis function transformation.

The currently prevailing delay-doppler domain modulation technique is known as orthogonal time-frequency space domain (Orthogonal Time Frequency Space, OTFS) modulation. An OTFS system based on orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) is implemented by adding a precoder at the transmitting side of the OFDM system, as shown in fig. 3, in which the transmitted signal x k, l is converted from the delay-doppler domain to the time-frequency domain using an inverse-octave fourier transform (INVERSE SYMPLECTIC Fourier Transform, ISFFT). And then, the receiving signals Y [ m, n ] of the time-frequency domain are obtained by using the transceiver flow of the OFDM system and are input to a decoder added on the receiving side, and the receiving signals Y [ k, l ] of the delay Doppler domain are obtained by calculating through the octave Fourier transform (SYMPLECTIC FOURIER TRANSFORM, SFFT). Then, channel estimation and equalization processing are carried out on y [ k, l ] in delay Doppler domain to obtain estimation of transmitting signal

The OTFS data is converted from the delay-doppler domain to the time-frequency domain by the ISSFT and SSFT transforms shown in fig. 3.

The signal processing method provided by the embodiment of the application is described in detail below through some embodiments and application scenarios thereof with reference to the accompanying drawings.

As shown in fig. 4, an embodiment of the present application provides a signal processing method, including:

Step 401: the transmitting device converts the delay-doppler signal into a frequency domain signal.

The sending device in the embodiment of the application can be a terminal, or can be network side equipment, such as a base station.

Step 402: and the sending equipment adds a cyclic prefix and/or a cyclic suffix to the frequency domain signal to obtain a processed frequency domain signal.

Here, the cyclic prefix adding process means that a signal at the tail of a subcarrier corresponding to a frequency domain signal is copied to the head of the subcarrier, and the cyclic suffix adding process means that a signal at the head of a subcarrier corresponding to a frequency domain signal is copied to the tail of the subcarrier.

Step 403: and the transmitting equipment obtains and transmits a time domain signal according to the processed frequency domain signal.

In the embodiment of the application, the transmitting equipment pair converts the delay Doppler signal into a frequency domain signal; adding a cyclic prefix and/or a cyclic suffix to the frequency domain signal to obtain a processed frequency domain signal; and obtaining a time domain signal according to the processed frequency domain signal and sending the time domain signal. In the embodiment of the application, the cyclic prefix and/or cyclic postfix addition processing is carried out on the frequency domain signal, namely, part of signals at the tail of the subcarrier are copied to the head of the subcarrier and/or part of signals at the head of the subcarrier are copied to the tail of the subcarrier, and when Doppler frequency shift occurs, the effective signals can be effectively prevented from deviating from the receiving bandwidth, thereby effectively improving the receiving performance.

As an alternative implementation, the transmitting device transforms the delay-doppler signal into a frequency domain signal, including:

performing delay Doppler domain mapping processing on the delay Doppler signals to obtain a first matrix, wherein the first matrix comprises M rows and N columns, and M and N are positive integers;

according to M row vectors of the first matrix, M first vectors are obtained, the M first vectors are in one-to-one correspondence with the M row vectors, and the first vectors are obtained by carrying out M repeated processing on the corresponding row vectors;

Obtaining M second vectors according to the M first vectors and the phase vectors corresponding to each first vector, wherein the phase vectors corresponding to different first vectors are different;

and performing superposition processing on the M second vectors to obtain a third vector, wherein the third vector comprises N.M frequency domain signals.

Specifically, as shown in fig. 5, each row vector of the first matrix is repeated for M times, so as to obtain a first vector, where the first vector includes n×m delay-doppler signals. Each first vector point is then multiplied by a phase vector to obtain a second vector S _m (k), and a third vector is obtained by the following formula.

Optionally, the phase vector corresponding to each first vector is determined according to the following formula:

Wherein pi represents the circumference ratio, and m takes on the value of [0: m-1], i.e., M is a row index, where (0: NM-1) represents from 0 to NM-1.

For example, m is set to 0 when determining the phase vector corresponding to the first row vector, 1 when determining the phase vector corresponding to the second row vector, and so on.

Alternatively, the superimposing processing on the M second vectors means adding data corresponding to the same column in the M second vectors. For example, one of the second vectors is (a ₀,A₁,……,A_N*M), the other second vector is (B ₀,B₁,……,B_N*M), and the third vector is (a ₀+B₀,A₁+B₁,……,A_N*M+B_N*M).

In this implementation manner, the sending device adds a cyclic prefix and/or a cyclic suffix to the frequency domain signal to obtain a processed frequency domain signal, where the method includes at least one of the following:

Adding I sub-carriers at first frequency positions of N.M sub-carriers corresponding to the frequency domain signals, wherein the first frequency positions are maximum frequency positions of the N.M sub-carriers, the I sub-carriers are I sub-carriers with the minimum frequency in the N.M sub-carriers, the bandwidths corresponding to the I sub-carriers are larger than or equal to first frequency deviation, and the I is a positive integer;

Adding J sub-carriers at a second frequency position of N x M sub-carriers corresponding to the frequency domain signal, wherein the second frequency position is the minimum frequency position of the N x M sub-carriers, the J sub-carriers are J sub-carriers with the largest frequency in the N x M sub-carriers, the bandwidths corresponding to the J sub-carriers are larger than or equal to a second frequency offset, and J is a positive integer;

the first frequency offset is used for indicating a maximum deviation value between an actual minimum frequency position of the n×m subcarriers and a preset minimum frequency position, and the second frequency offset is used for indicating a maximum deviation value between an actual maximum frequency position of the n×m subcarriers and a preset maximum frequency position.

Assuming that the maximum frequency of the left offset caused by the doppler effect is C (corresponding to the first frequency offset), the number of I subcarriers located at the tail of the n×m subcarriers is increased at the head (the position with the maximum frequency) of the n×m subcarriers. In the embodiment of the application, the head part refers to a position with larger frequency, the tail part refers to a position with smaller frequency, the bandwidth corresponding to the I sub-carrier is larger than or equal to C, and when Doppler frequency shift occurs, the larger part of the effective signal frequency can be effectively prevented from deviating from the receiving bandwidth.

Assuming that the maximum frequency of the right offset caused by the doppler effect is D (corresponding to the second frequency offset), J subcarriers located at the head of n×m subcarriers are added at the tail (where the frequency is minimum) of n×m subcarriers. In the embodiment of the application, the head part refers to a position with larger frequency, the tail part refers to a position with smaller frequency, the bandwidth corresponding to J subcarriers is larger than or equal to D, and when Doppler frequency shift occurs, the smaller part of the effective signal frequency can be effectively prevented from shifting out of the receiving bandwidth.

Optionally, in this implementation manner, the sending device obtains a time domain signal according to the processed frequency domain signal, including:

The transmitting device maps the processed frequency domain signals on sub-carriers, and performs Inverse Fast Fourier Transform (IFFT) processing on the mapped sub-carriers to obtain time domain signals, wherein the time domain signals comprise N OFDM symbols.

Specifically, the processed n×m frequency domain signals are mapped onto n×m frequency domain subcarriers, and time domain data is obtained through K1 point IFFT transformation, where K1 is greater than or equal to n×m.

As another alternative implementation, the transmitting device transforms the delay-doppler signal into a frequency domain signal, including:

Performing two-dimensional Fourier transform on the delay Doppler signal to obtain a second matrix, wherein the second matrix comprises M times N time-frequency domain symbols;

And obtaining a frequency domain signal according to the time-frequency domain symbols corresponding to the N column vectors of the second matrix.

Specifically, performing two-dimensional fourier transform on the delay-doppler signal to obtain a second matrix, wherein the second matrix comprises performing delay-doppler domain mapping processing on the delay-doppler signal to obtain a first matrix, and the first matrix comprises M rows and N columns, wherein M and N are positive integers; and performing two-dimensional Fourier transform on the first matrix to obtain a second matrix.

Here, each column vector corresponds to one subcarrier. The two-dimensional fourier transform may be ISFFT.

In this implementation manner, the sending device adds a cyclic prefix and/or a cyclic suffix to the frequency domain signal to obtain a processed frequency domain signal, where the method includes:

Adding a cyclic prefix and/or a cyclic suffix to each column vector of the second matrix to obtain a processed frequency domain signal, wherein each column vector in the second matrix corresponds to M subcarriers, each processed column vector comprises M+P subcarriers, P=I+J, I is the number of subcarriers corresponding to the cyclic prefix, J is the number of subcarriers corresponding to the cyclic suffix, the bandwidth corresponding to the I subcarrier is greater than or equal to a third frequency offset, the bandwidth corresponding to the J subcarrier is greater than or equal to a fourth frequency offset, and both I and J are positive integers;

The third frequency offset is used for indicating a maximum deviation value between an actual minimum frequency position and a preset minimum frequency position of the M subcarriers, and the fourth frequency offset is used for indicating a maximum deviation value between an actual maximum frequency position and a preset maximum frequency position of the M subcarriers.

Here, the third frequency offset may be understood as a maximum frequency at which the spectrum is shifted leftward (toward a direction in which the frequency is small), and the fourth frequency offset may be understood as a maximum frequency at which the spectrum is shifted rightward (toward a direction in which the frequency is large).

Optionally, adding a cyclic prefix and/or cyclic suffix to each column vector of the second matrix to obtain a processed frequency domain signal, including at least one of:

Adding I subcarriers at a third frequency position of M subcarriers corresponding to each column vector to obtain a processed frequency domain signal, wherein the third frequency position is the maximum frequency position of the M subcarriers, and the I subcarriers are I subcarriers with the minimum frequency in the M subcarriers;

j subcarriers are added to fourth frequency positions of M subcarriers corresponding to each column vector, the fourth frequency positions are minimum frequency positions of the M subcarriers, and the J subcarriers are J subcarriers with the largest frequency among the M subcarriers, so that the processed frequency domain signal is obtained.

In the embodiment of the present application, assuming that the maximum frequency of the left offset caused by the doppler effect is C (corresponding to the third frequency offset), the I subcarriers located at the tail of the M subcarriers are added to the head (the position with the maximum frequency) of the M subcarriers corresponding to each column vector. In the embodiment of the application, the head part refers to a position with larger frequency, the tail part refers to a position with smaller frequency, the bandwidth corresponding to the I sub-carrier is larger than or equal to C, and when Doppler frequency shift occurs, the larger part of the effective signal frequency can be effectively prevented from deviating from the receiving bandwidth.

Assuming that the maximum frequency of the right offset caused by the doppler effect is D (corresponding to the fourth frequency offset), J subcarriers located at the head of M subcarriers are added at the tail (the position where the frequency is minimum) of M subcarriers corresponding to each column vector. In the embodiment of the application, the head part refers to a position with larger frequency, the tail part refers to a position with smaller frequency, the bandwidth corresponding to J subcarriers is larger than or equal to D, and when Doppler frequency shift occurs, the smaller part of the effective signal frequency can be effectively prevented from shifting out of the receiving bandwidth.

Specifically, each column vector after processing is mapped on a subcarrier, and then is subjected to K2 point IFFT conversion to obtain N OFDM symbols, wherein K2 is more than or equal to M+P.

Optionally, the method of the embodiment of the present application further includes:

acquiring a cyclic prefix length and/or a cyclic suffix length, wherein the cyclic prefix length and/or the cyclic suffix length are obtained according to the measured Doppler frequency offset value;

And updating the I value according to the cyclic prefix length and/or updating the J value according to the cyclic suffix length.

In an implementation manner, the sending device is a terminal;

acquiring the cyclic prefix length and/or the cyclic suffix length, including:

The terminal measures Doppler frequency offset to obtain a measured Doppler frequency offset value;

the terminal sends the measured Doppler frequency offset value to network side equipment;

the terminal acquires the cyclic prefix length and/or the cyclic postfix length sent by the network side equipment.

In the implementation mode, the terminal can autonomously measure the Doppler frequency offset, and the base station can schedule the terminal to measure the Doppler frequency offset.

In an implementation manner, the sending device is a network side device;

acquiring the cyclic prefix length and/or the cyclic suffix length, including:

The network side equipment acquires a Doppler frequency offset value, wherein the Doppler frequency offset value is obtained by measuring the network side equipment or is sent to the network side equipment by a terminal;

and determining the cyclic prefix and/or cyclic postfix length according to the Doppler frequency offset value.

In the implementation manner, the network side equipment can autonomously measure the Doppler frequency offset to obtain the Doppler frequency offset value, and also can schedule the terminal to measure the Doppler frequency offset to obtain the Doppler frequency offset value.

Optionally, after the determining the cyclic prefix and/or cyclic suffix length, the method further includes:

And sending the cyclic prefix and/or the cyclic suffix length to a terminal.

In the embodiment of the present application, in order to accommodate the case where the doppler shift is maximum, the cyclic prefix and cyclic suffix need to be set to values larger than the maximum doppler shift. In this way, in most cases, the spectrum utilization rate is reduced, and based on this, the application dynamically adjusts the cyclic prefix or cyclic suffix based on the Doppler frequency offset value, so as to improve the spectrum utilization rate.

In one implementation, the measurement of the doppler frequency offset is performed on the terminal side, and the method of dynamic adjustment is as follows:

(1) The terminal starts the frequency offset measurement. The terminal can autonomously start the frequency offset measurement according to a fixed period, and can also start the frequency offset measurement through the scheduling of the base station. The base station scheduling starts frequency offset measurement through DCI or through RRC message;

(2) And quantizing the measured frequency offset value into the number of subcarriers. In the application, two methods are used for indicating the number of subcarriers, one is direct representation, and the other is a table look-up method. The direct representation method has accurate number of the feedback subcarriers. The table look-up method selects the identification of the table according to the real measured value, and feeds back the identification of the table to the base station. The indication method has less bit number and occupies less resources.

(3) The number of sub-carriers corresponding to the cyclic prefix and/or the suffix can be fed back to the base station through UCI or an RRC message. The timing of the feedback is determined in two ways: actively feeding back according to a fixed period and passively feeding back according to the scheduling of the base station;

(4) After receiving the number of sub-carriers corresponding to the cyclic prefix and/or the cyclic suffix fed back by the terminal, the base station groups the terminal according to the number of sub-carriers corresponding to the cyclic prefix and/or the cyclic suffix. Optionally, the grouping is performed according to a certain policy, for example, each group selects the same cyclic prefix and/or cyclic suffix value, and notifies the terminals by group.

Informing the content of the terminal, wherein the content comprises absolute values (number of empty subcarriers, table lookup method or direct method) of cyclic prefixes and/or suffixes, or the content comprises increasing or decreasing amounts of the cyclic prefixes and/or the cyclic suffixes relative to the existing cyclic prefixes and/or the cyclic suffixes, and meanwhile comprises effective interval K values which represent K slots, and the change of the cyclic prefixes/suffixes is formally effective;

(5) The base station informs the terminal to change the cyclic prefix/suffix, which may be through DCI, or an RRC message.

In an implementation manner, in a TDD system, since uplink and downlink channels have diversity, doppler shift measurement may also be performed on the base station side, and the method of dynamic adjustment is as follows:

The base station performs Doppler frequency offset measurement according to uplink signals sent by different terminals, groups the terminals according to the Doppler frequency offset, selects the same cyclic prefix and/or cyclic suffix value (specifically, subcarrier number) in each group, and notifies the terminals of the determined cyclic prefix and/or cyclic suffix value and effective time (the notification mode is the same as that in the implementation mode of performing Doppler offset measurement by the terminals).

Optionally, the transforming the delay-doppler signal into a frequency domain signal includes:

Mapping the delay Doppler signal to a delay Doppler domain to obtain a third matrix, wherein the third matrix comprises L rows and N columns, and L is a positive integer;

Adding S row vectors at a first delay position in the third matrix to obtain a processed delay Doppler signal (namely the first matrix); the first delay position is the maximum delay position corresponding to the third matrix, the S row vectors are the S row vectors with the smallest delay value in the third matrix, and S is a positive integer;

And converting the processed delay Doppler signal into a frequency domain signal. Alternatively, l+s=m.

Optionally, in the embodiment of the present application, the signal to be sent is mapped to a matrix with dimensions of L rows and N columns according to a preceding column and a succeeding column or according to a preceding column and a succeeding column, so as to obtain a third matrix, where the value of L may be 1. As shown in fig. 5, the S row vectors with the smallest delay value in the third matrix are copied to the position of the row vector with the largest delay value, that is, the purpose of adding the cyclic prefix in the delay domain is achieved, and compared with the convolution effect (shown in fig. 6) that the cyclic prefix is not added in the delay domain, the first matrix of the present application can achieve perfect cyclic convolution in the delay domain, as shown in fig. 7.

In the signal processing method provided by the embodiment of the application, the execution main body can be a signal processing device. In the embodiment of the present application, a signal processing device is used as an example to execute a signal processing method by using a signal processing device.

As shown in fig. 8, an embodiment of the present application provides a signal processing apparatus 800, applied to a transmitting device, including:

a first processing module 801, configured to transform the delay-doppler signal into a frequency domain signal;

A second processing module 802, configured to add a cyclic prefix and/or a cyclic suffix to the frequency domain signal, to obtain a processed frequency domain signal;

and a third processing module 803, configured to obtain a time domain signal according to the processed frequency domain signal, and send the time domain signal.

Optionally, the second processing module includes:

The first mapping submodule is used for carrying out delay Doppler domain mapping processing on the delay Doppler signals to obtain a first matrix, wherein the first matrix comprises M rows and N columns, and M and N are positive integers; the first acquisition submodule is used for obtaining M first vectors according to M row vectors of the first matrix, the M first vectors are in one-to-one correspondence with the M row vectors, and the first vectors are obtained by carrying out M repeated processing on the corresponding row vectors;

The second acquisition submodule is used for obtaining M second vectors according to the M first vectors and the phase vector corresponding to each first vector, wherein the phase vectors corresponding to different first vectors are different;

The first processing sub-module is used for carrying out superposition processing on the M second vectors to obtain a third vector, and the third vector comprises N.M frequency domain signals.

Optionally, the second processing module is configured to perform at least one of:

Optionally, the first processing module includes:

A third acquisition sub-module, configured to perform two-dimensional fourier transform on the delayed doppler signal to obtain a second matrix, where the second matrix includes m×n time-frequency domain symbols;

and the fourth acquisition sub-module is used for obtaining a frequency domain signal according to the time-frequency domain symbols corresponding to the N column vectors of the second matrix.

Optionally, the second processing module is configured to add a cyclic prefix and/or a cyclic suffix to each column vector of the second matrix to obtain a processed frequency domain signal, where each column vector in the second matrix corresponds to M subcarriers, the processed column vector includes m+p subcarriers, p=i+j, I is the number of subcarriers corresponding to the cyclic prefix, J is the number of subcarriers corresponding to the cyclic suffix, the bandwidth corresponding to the I subcarrier is greater than or equal to a third frequency offset, the bandwidth corresponding to the J subcarrier is greater than or equal to a fourth frequency offset, and both I and J are positive integers;

Optionally, the device of the embodiment of the present application further includes:

the first acquisition module is used for acquiring the cyclic prefix length and/or the cyclic suffix length, wherein the cyclic prefix length and/or the cyclic suffix length is obtained according to the measured Doppler frequency offset value;

And the updating module is used for updating the I value according to the cyclic prefix length and/or updating the J value according to the cyclic suffix length.

Optionally, the sending device is a terminal;

The first acquisition module includes:

The first measurement submodule is used for measuring Doppler frequency offset to obtain a measured Doppler frequency offset value;

a first transmitting sub-module, configured to transmit the measured doppler frequency offset value to a network side device;

and the fifth acquisition sub-module is used for acquiring the cyclic prefix length and/or the cyclic postfix length sent by the network side equipment.

Optionally, the sending device is a network side device;

The first acquisition module includes:

A sixth obtaining sub-module, configured to obtain a doppler frequency offset value, where the doppler frequency offset value is obtained by measuring the network side device or is sent by a terminal to the network side device;

and the first determining submodule is used for determining the cyclic prefix and/or the cyclic postfix length according to the Doppler frequency offset value.

Optionally, the first acquisition module further includes:

and the second sending submodule is used for sending the cyclic prefix and/or the cyclic postfix length to the terminal.

Optionally, the third processing module is configured to map the processed frequency domain signal onto a subcarrier, and perform inverse fast fourier transform IFFT processing on the mapped subcarrier to obtain a time domain signal, where the time domain signal includes N OFDM symbols.

Optionally, the first processing module includes:

A second mapping sub-module, configured to map the delay-doppler signal to a delay-doppler domain, so as to obtain a third matrix, where the third matrix includes L rows and N columns, and L is a positive integer;

A seventh obtaining sub-module, configured to add S row vectors at the first delay position in the third matrix, to obtain a processed delay doppler signal; the first delay position is the maximum delay position corresponding to the third matrix, the S row vectors are the S row vectors with the smallest delay value in the third matrix, and S is a positive integer;

and the conversion sub-module is used for converting the processed delay Doppler signal into a frequency domain signal.

The signal processing device in the embodiment of the application may be an electronic device, for example, an electronic device with an operating system, or may be a component in an electronic device, for example, an integrated circuit or a chip. The electronic device may be a terminal, or may be other devices than a terminal. By way of example, the terminals may include, but are not limited to, the types of terminals 11 listed above, other devices may be servers, network attached storage (Network Attached Storage, NAS), etc., and embodiments of the present application are not limited in detail.

The signal processing device provided by the embodiment of the present application can implement each process implemented by the embodiments of the methods of fig. 4 to fig. 7, and achieve the same technical effects, and in order to avoid repetition, a detailed description is omitted here.

Optionally, as shown in fig. 9, the embodiment of the present application further provides a communication device 900, including a processor 901 and a memory 902, where the memory 902 stores a program or instructions that can be executed on the processor 901.

The embodiment of the application also provides a terminal, which comprises a processor and a communication interface, wherein the processor is used for converting the delay Doppler signal into a frequency domain signal; adding a cyclic prefix and/or a cyclic suffix to the frequency domain signal to obtain a processed frequency domain signal; and obtaining a time domain signal according to the processed frequency domain signal, wherein the communication interface is used for transmitting the time domain signal. The terminal embodiment corresponds to the method embodiment, and each implementation process and implementation manner of the method embodiment are applicable to the terminal embodiment and can achieve the same technical effect. Specifically, fig. x is a schematic diagram of a hardware structure of a terminal for implementing an embodiment of the present application.

The terminal 1000 includes, but is not limited to: at least some of the components of the radio frequency unit 1001, the network module 1002, the audio output unit 1003, the input unit 1004, the sensor 1005, the display unit 1006, the user input unit 1007, the interface unit 1008, the memory 1009, and the processor 1010, etc.

Those skilled in the art will appreciate that terminal 1000 can also include a power source (e.g., a battery) for powering the various components, which can be logically connected to processor 1010 by a power management system so as to perform functions such as managing charge, discharge, and power consumption by the power management system. The terminal structure shown in fig. 10 does not constitute a limitation of the terminal, and the terminal may include more or less components than shown, or may combine some components, or may be arranged in different components, which will not be described in detail herein.

It should be appreciated that in embodiments of the present application, the input unit 1004 may include a graphics processing unit (Graphics Processing Unit, GPU) 10041 and a microphone 10042, where the graphics processor 10041 processes image data of still pictures or video obtained by an image capturing device (e.g., a camera) in a video capturing mode or an image capturing mode. The display unit 1006 may include a display panel 10061, and the display panel 10061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 1007 includes at least one of a touch panel 10071 and other input devices 10072. The touch panel 10071 is also referred to as a touch screen. The touch panel 10071 can include two portions, a touch detection device and a touch controller. Other input devices 10072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and so forth, which are not described in detail herein.

In the embodiment of the present application, after receiving downlink data from the network side device, the radio frequency unit 1001 may transmit the downlink data to the processor 1010 for processing; in addition, the radio frequency unit 1001 may send uplink data to the network side device. In general, the radio frequency unit 1001 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like.

The memory 1009 may be used to store software programs or instructions and various data. The memory 1009 may mainly include a first memory area storing programs or instructions and a second memory area storing data, wherein the first memory area may store an operating system, application programs or instructions (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like. Further, the memory 1009 may include volatile memory or nonvolatile memory, or the memory 1009 may include both volatile and nonvolatile memory. The nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable EPROM (EEPROM), or a flash Memory. The volatile memory may be random access memory (Random Access Memory, RAM), static random access memory (STATIC RAM, SRAM), dynamic random access memory (DYNAMIC RAM, DRAM), synchronous Dynamic Random Access Memory (SDRAM), double data rate Synchronous dynamic random access memory (Double DATA RATE SDRAM, DDRSDRAM), enhanced Synchronous dynamic random access memory (ENHANCED SDRAM, ESDRAM), synchronous link dynamic random access memory (SYNCH LINK DRAM, SLDRAM), and Direct random access memory (DRRAM). Memory 1009 in embodiments of the application includes, but is not limited to, these and any other suitable types of memory.

The processor 1010 may include one or more processing units; optionally, the processor 1010 integrates an application processor that primarily processes operations involving an operating system, user interface, application programs, and the like, and a modem processor that primarily processes wireless communication signals, such as a baseband processor. It will be appreciated that the modem processor described above may not be integrated into the processor 1010.

Wherein the processor 1010 is configured to transform the delay-doppler signal into a frequency domain signal; adding a cyclic prefix and/or a cyclic suffix to the frequency domain signal to obtain a processed frequency domain signal; obtaining a time domain signal according to the processed frequency domain signal; the radio frequency unit 1001 is configured to transmit a time domain signal.

Optionally, the processor 1010 is configured to perform delay-doppler domain mapping processing on the delay-doppler signal to obtain a first matrix, where the first matrix includes M rows and N columns, and M and N are positive integers; according to M row vectors of the first matrix, M first vectors are obtained, the M first vectors are in one-to-one correspondence with the M row vectors, and the first vectors are obtained by carrying out M repeated processing on the corresponding row vectors; obtaining M second vectors according to the M first vectors and the phase vectors corresponding to each first vector, wherein the phase vectors corresponding to different first vectors are different; and performing superposition processing on the M second vectors to obtain a third vector, wherein the third vector comprises N.M frequency domain signals.

Optionally, the processor 1010 is further configured to perform at least one of:

Optionally, the processor 1010 is further configured to perform two-dimensional fourier transform on the delayed doppler signal to obtain a second matrix, where the second matrix includes m×n time-frequency domain symbols;

Optionally, the processor 1010 is further configured to add a cyclic prefix and/or a cyclic suffix to each column vector of the second matrix to obtain a processed frequency domain signal, where each column vector in the second matrix corresponds to M subcarriers, the processed column vector includes m+p subcarriers, p=i+j, I is the number of subcarriers corresponding to the cyclic prefix, J is the number of subcarriers corresponding to the cyclic suffix, the bandwidth corresponding to the I subcarrier is greater than or equal to a third frequency offset, the bandwidth corresponding to the J subcarrier is greater than or equal to a fourth frequency offset, and both I and J are positive integers;

Optionally, the processor 1010 is further configured to obtain a cyclic prefix length and/or a cyclic suffix length, where the cyclic prefix length and/or the cyclic suffix length are obtained according to the measured doppler frequency offset value;

Optionally, the processor 1010 is further configured to measure a doppler frequency offset to obtain a measured doppler frequency offset value; transmitting the measured Doppler frequency offset value to network side equipment; and acquiring the cyclic prefix length and/or the cyclic postfix length sent by the network side equipment.

Optionally, the processor 1010 is further configured to map the processed frequency domain signal on a subcarrier by using the transmitting device, and perform inverse fast fourier transform IFFT processing on the mapped subcarrier to obtain a time domain signal, where the time domain signal includes N OFDM symbols.

Optionally, the processor 1010 is further configured to map the delay-doppler signal to a delay-doppler domain, so as to obtain a third matrix, where the third matrix includes L rows and N columns, and L is a positive integer;

Adding S row vectors at the first delay position in the third matrix to obtain a processed delay Doppler signal; the first delay position is the maximum delay position corresponding to the third matrix, the S row vectors are the S row vectors with the smallest delay value in the third matrix, and S is a positive integer;

And converting the processed delay Doppler signal into a frequency domain signal.

The embodiment of the application also provides network side equipment which comprises a processor and a communication interface, wherein the processor is used for converting the delay Doppler signal into a frequency domain signal; adding a cyclic prefix and/or a cyclic suffix to the frequency domain signal to obtain a processed frequency domain signal; and obtaining a time domain signal according to the processed frequency domain signal, wherein the communication interface is used for transmitting the time domain signal. The network side device embodiment corresponds to the method embodiment, and each implementation process and implementation manner of the method embodiment can be applied to the network side device embodiment, and the same technical effects can be achieved.

Specifically, the embodiment of the application also provides network side equipment. As shown in fig. 11, the network side device 1100 includes: an antenna 111, a radio frequency device 112, a baseband device 113, a processor 114 and a memory 115. The antenna 111 is connected to a radio frequency device 112. In the uplink direction, the radio frequency device 112 receives information via the antenna 111, and transmits the received information to the baseband device 113 for processing. In the downlink direction, the baseband device 113 processes information to be transmitted, and transmits the processed information to the radio frequency device 112, and the radio frequency device 112 processes the received information and transmits the processed information through the antenna 111.

The method performed by the network side device in the above embodiment may be implemented in the baseband apparatus 113, where the baseband apparatus 113 includes a baseband processor.

The baseband apparatus 113 may, for example, include at least one baseband board, where a plurality of chips are disposed, as shown in fig. 11, where one chip, for example, a baseband processor, is connected to the memory 115 through a bus interface, so as to call a program in the memory 115 to perform the network device operation shown in the above method embodiment.

The network-side device may also include a network interface 116, such as a common public radio interface (common public radio interface, CPRI).

Specifically, the network side device 1100 of the embodiment of the present invention further includes: instructions or programs stored in the memory 115 and capable of running on the processor 114, the processor 114 invokes the instructions or programs in the memory 115 to perform the method performed by the modules shown in fig. 8, and achieve the same technical effects, and are not repeated here.

The embodiment of the application also provides a readable storage medium, on which a program or an instruction is stored, which when executed by a processor, implements each process of the above signal processing method embodiment, and can achieve the same technical effects, and in order to avoid repetition, a detailed description is omitted here.

Wherein the processor is a processor in the terminal described in the above embodiment. The readable storage medium includes computer readable storage medium such as computer readable memory ROM, random access memory RAM, magnetic or optical disk, etc.

The embodiment of the application further provides a chip, which comprises a processor and a communication interface, wherein the communication interface is coupled with the processor, and the processor is used for running programs or instructions to realize the processes of the signal processing method embodiment, and can achieve the same technical effects, so that repetition is avoided, and the description is omitted here.

It should be understood that the chips referred to in the embodiments of the present application may also be referred to as system-on-chip chips, or the like.

The embodiments of the present application further provide a computer program/program product stored in a storage medium, where the computer program/program product is executed by at least one processor to implement each process of the above-mentioned signal processing method embodiment, and achieve the same technical effects, so that repetition is avoided, and details are not repeated here.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a computer software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method according to the embodiments of the present application.

The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are to be protected by the present application.

Claims

1. A signal processing method, comprising:

2. The method of claim 1, wherein the transmitting device transforms the delay-doppler signal to a frequency domain signal, comprising:

3. The method of claim 2, wherein the transmitting device adds a cyclic prefix and/or cyclic suffix to the frequency domain signal to obtain a processed frequency domain signal, comprising at least one of:

4. The method of claim 1, wherein the transmitting device transforms the delay-doppler signal to a frequency domain signal, comprising:

5. The method of claim 4, wherein the transmitting device adds a cyclic prefix and/or cyclic suffix to the frequency domain signal to obtain a processed frequency domain signal, comprising:

6. The method of claim 5, wherein adding a cyclic prefix and/or cyclic suffix to each column vector of the second matrix results in a processed frequency domain signal, comprising at least one of:

7. The method according to claim 3 or 5, further comprising:

8. The method of claim 7, wherein the transmitting device is a terminal;

acquiring the cyclic prefix length and/or the cyclic suffix length, including:

9. The method of claim 7, wherein the transmitting device is a network-side device;

acquiring the cyclic prefix length and/or the cyclic suffix length, including:

10. The method according to claim 9, wherein after the determining the cyclic prefix and/or cyclic postfix length, the method further comprises:

And sending the cyclic prefix and/or the cyclic suffix length to a terminal.

11. The method of claim 1, wherein the transmitting device obtains a time domain signal from the processed frequency domain signal, comprising:

12. The method of claim 1, wherein the transmitting device transforms the delay-doppler signal to a frequency domain signal, comprising:

13. A signal processing apparatus applied to a transmitting device, comprising:

a first processing module for transforming the delay-doppler signal into a frequency domain signal;

14. The apparatus of claim 13, wherein the second processing module comprises:

15. The apparatus of claim 14, wherein the second processing module is configured to perform at least one of:

16. The apparatus of claim 13, wherein the first processing module comprises:

17. The apparatus of claim 16, wherein the second processing module is configured to add a cyclic prefix and/or a cyclic suffix to each column vector of the second matrix to obtain a processed frequency domain signal, each column vector in the second matrix corresponds to M subcarriers, the processed column vector includes m+p subcarriers, p=i+j, I is a number of subcarriers corresponding to the cyclic prefix, J is a number of subcarriers corresponding to the cyclic suffix, a bandwidth corresponding to the I subcarriers is greater than or equal to a third frequency offset, a bandwidth corresponding to the J subcarriers is greater than or equal to a fourth frequency offset, and both I and J are positive integers;

18. The apparatus of claim 17, wherein the second processing module is configured to perform at least one of:

19. The apparatus according to claim 15 or 17, further comprising:

20. The apparatus of claim 19, wherein the transmitting device is a terminal;

The first acquisition module includes:

21. The apparatus of claim 19, wherein the transmitting device is a network-side device;

The first acquisition module includes:

22. The apparatus of claim 21, wherein the first acquisition module further comprises:

23. The apparatus of claim 13, wherein the third processing module is configured to map the processed frequency domain signal onto subcarriers and perform inverse fast fourier transform, IFFT, processing on the mapped subcarriers to obtain a time domain signal, where the time domain signal includes N OFDM symbols.

24. The apparatus of claim 13, wherein the first processing module comprises:

25. A communication device comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, implement the steps of the signal processing method of any one of claims 1 to 12.

26. A readable storage medium, characterized in that the readable storage medium has stored thereon a program or instructions which, when executed by a processor, implement the steps of the signal processing method according to any of claims 1 to 12.