WO2024037446A1

WO2024037446A1 - Signal processing method and apparatus, and communication device

Info

Publication number: WO2024037446A1
Application number: PCT/CN2023/112530
Authority: WO
Inventors: 姜大洁; 吴建明
Original assignee: 维沃移动通信有限公司
Priority date: 2022-08-17
Filing date: 2023-08-11
Publication date: 2024-02-22
Also published as: CN117640328A

Abstract

The present application relates to the technical field of communications, and discloses a signal processing method and apparatus, and a communication device. The signal processing method of embodiments of the present application comprises: a transmitting end device modulates a main signal in a symbiotic backscatter communication signal to obtain a first main signal, wherein the first main signal comprises M modulator blocks, each modulator block comprises K first reference signals, K is greater than or equal to 1 and is less than or equal to N, N is the number of resource units comprised in each modulator block, K is a positive integer, N is greater than or equal to 2, and M and N are positive integers.

Description

Signal processing method, device and communication equipment

Cross-references to related applications

This application claims priority from Chinese Patent Application No. 202210991995.7 filed in China on August 17, 2022, the entire content of which is incorporated herein by reference.

Technical field

The present application belongs to the field of communication technology, and specifically relates to a signal processing method, device and communication equipment.

Background technique

Backscatter communication means that backscatter communication equipment uses radio frequency signals from other devices or the environment to perform signal modulation to transmit its own information. The symbiotic backscatter communication signal includes a primary signal and a secondary signal, where the primary signal is sent by the transmitting end device, the backscatter communication device receives the primary signal and generates a secondary signal through modulation, and finally backscatters the secondary signal. Since the demodulation process is relatively complex, only one of the primary signal and the secondary signal carries data in the related technology. This application considers and proposes a new scenario, that is, a scenario in which the primary signal carries data and the secondary signal also carries data. In this scenario, the receiving device cannot demodulate the data in the secondary signal, and when demodulating the primary signal The signal data uses the Maximum-Likelihood (ML) detection algorithm, linear detection algorithm and detection algorithm based on Successive Interference Cancellation (SIC) to demodulate the main signal. Its complexity is high and related It is difficult for systems in the art to meet this high-complexity demodulation method. Therefore, this application proposes a method for demodulating symbiotic backscattered communication signals in this scenario.

It should be noted that the above content is only for the convenience of understanding the technical solution of the present application and does not constitute a limitation of the relevant technology of the present application.

Contents of the invention

Embodiments of the present application provide a signal processing method, device and communication equipment, which can solve the problem of how to simply demodulate symbiotic backscattered communication signals.

The first aspect provides a signal processing method, including:

The sending end device modulates the main signal in the symbiotic backscattering communication signal to obtain the first main signal;

Wherein, the first main signal includes M modulation blocks, and each modulation block includes K first reference signals, 1≤K≤N, and N is the number of resource units included in each modulation block, K is a positive integer, N≥2, and M and N are positive integers.

The second aspect provides a signal processing method, including:

The backscatter communication device receives a first main signal, the first main signal includes M modulation blocks, each of the modulation blocks The modulation block includes K first reference signals, 1≤K≤N, N is the number of resource units included in each modulation block, K is a positive integer, N≥2, and M and N are positive integers;

The backscatter communication device modulates M secondary signals according to the first main signal to obtain modulated secondary signals.

In the third aspect, a signal processing method is provided, including:

The receiving end device acquires the first main signal, and performs coherent demodulation and decoding processing on the first main signal according to the first reference signal in the first main signal to obtain the data in the first main signal, so The first main signal includes M modulation blocks, each modulation block includes K first reference signals, 1≤K≤N, N is the number of resource units included in each modulation block, and K is a positive Integers, N≥2, and M and N are positive integers;

The receiving end device acquires the symbiotic backscatter modulation block, performs coherent demodulation processing on the symbiotic backscatter modulation block according to the first primary signal, and obtains data in the secondary signal, and M is a positive integer.

In the fourth aspect, a signal processing device is provided, applied to sending end equipment, including:

The first modulation module is used for the sending end device to modulate the main signal in the symbiotic backscatter communication signal to obtain the first main signal;

In a fifth aspect, a signal processing device is provided for use in backscatter communication equipment, including:

The first receiving module is used to receive the first main signal. The first main signal includes M modulation blocks. Each of the modulation blocks includes K first reference signals, 1≤K≤N, and N is each The number of resource units included in the modulation block, K is a positive integer, N≥2, and M and N are positive integers;

The second modulation module is used to modulate M secondary signals according to the first main signal to obtain modulated secondary signals.

In the sixth aspect, a signal processing device is provided, applied to receiving end equipment, including:

The first processing module is used to obtain the first main signal, and perform coherent demodulation and decoding processing on the first main signal according to the first reference signal in the first main signal to obtain the first main signal. data, the first main signal includes M modulation blocks, each modulation block includes K first reference signals, 1≤K≤N, N is the number of resource units included in each modulation block. , K is a positive integer, N≥2, and M and N are positive integers;

The second processing module is used to obtain the co-occurring backscattering modulation block, perform coherent demodulation processing on the co-occurring backscattering modulation block according to the first main signal, and obtain data in the secondary signal, and M is a positive integer.

In a seventh aspect, a terminal is provided. The terminal includes a processor and a memory. The memory stores programs or instructions that can be run on the processor. When the program or instructions are executed by the processor, the following implementations are implemented: The steps of the method described in the first aspect, the second aspect or the third aspect.

In an eighth aspect, a terminal is provided, including a processor and a communication interface, wherein the processor is used to modulate the main signal in the symbiotic backscatter communication signal to obtain the first main signal;

Wherein, the first main signal includes M modulation blocks, and each modulation block includes K first reference signals, 1≤K≤N, and N is the number of resource units included in each modulation block, K is a positive integer, N≥2, and M and N are positive integers;

Alternatively, the communication interface is used to receive a first main signal, the first main signal includes M modulation blocks, each of the modulation blocks includes K first reference signals, 1≤K≤N, N is each The number of resource units included in the modulation block, K is a positive integer, N≥2, and M and N are positive integers; the processor is used to modulate M secondary signals according to the first main signal to obtain the modulated secondary signals. Signal.

Alternatively, the processor is configured for the receiving end device to obtain the first main signal, and perform coherent demodulation and decoding processing on the first main signal according to the first reference signal in the first main signal to obtain the first main signal. The first main signal includes M modulation blocks, and each modulation block includes K first reference signals, 1≤K≤N, and N is the number of resource units included in each modulation block. Quantity, K is a positive integer, N≥2, and M and N are positive integers; obtain the co-occurring backscattering modulation block, and perform coherent demodulation processing on the co-occurring backscattering modulation block according to the first main signal to obtain The data in the secondary signal, and M is a positive integer.

In a ninth aspect, a network side device is provided. The network side device includes a processor and a memory. The memory stores programs or instructions that can be run on the processor. The program or instructions are executed by the processor. When implementing the steps of the method described in the first aspect, the second aspect or the third aspect.

In a tenth aspect, a network side device is provided, including a processor and a communication interface, wherein the processor is used to modulate the main signal in the symbiotic backscatter communication signal to obtain the first main signal;

In an eleventh aspect, a signal processing system is provided, including: a transmitting end device, a backscattering communication device, and a receiving end device. The transmitting end device can be used to perform the steps of the method described in the first aspect, wherein The backscatter communication device may be used to perform the steps of the method as described in the second aspect, and the receiving end device may be used to perform the steps of the method as described in the third aspect.

In a twelfth aspect, a readable storage medium is provided. Programs or instructions are stored on the readable storage medium. When the programs or instructions are executed by a processor, the steps of the method described in the first aspect are implemented, or the steps of the method are implemented. The steps of the method as described in the second aspect, or the steps of implementing the method as described in the third aspect.

In a thirteenth aspect, a chip is provided. The chip includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the method described in the first aspect. method, or implement the method as described in the second aspect, or implement the method as described in the third aspect.

In a fourteenth aspect, a computer program/program product is provided, the computer program/program product is stored in a storage medium, and the computer program/program product is executed by at least one processor to implement as described in the first aspect method, or implement the method described in the second aspect, or implement the method described in the third aspect.

In this embodiment of the present application, the sending end device inserts K first reference signals into each modulation block of the main signal to obtain the first main signal, so that the receiving end device can simply and effectively modify the first reference signal based on the first reference signal. A primary signal is coherently demodulated and decoded, and then the secondary signal can be demodulated according to the demodulated data of the first primary signal, thereby achieving simple demodulation of the primary signal and the symbiotic backscattering communication signal. The purpose of the secondary signal.

Description of drawings

Figure 1 shows a structural diagram of a communication system applicable to the embodiment of the present application;

Figure 2 shows the sending and receiving scenarios of Passive IoT;

Figure 3 shows a schematic diagram of the primary signal and secondary signal in Passive IoT-related symbiotic backscattering;

Figure 4 shows a schematic diagram of Passive IoT symbiotic backscattering using beam forming;

Figure 5 shows one of the schematic flow diagrams of the signal processing method according to the embodiment of the present application;

Figure 6 shows a schematic diagram of the modulation of the main signal and the secondary signal in the time domain based on a single carrier in this application;

Figure 7 shows a schematic diagram of the modulation of the main signal and the secondary signal in the frequency domain based on OFDM waveforms in this application;

Figure 8 shows a schematic diagram of the design of the first reference signal in the main signal in this application;

Figure 9 shows a schematic diagram of the modulation of the primary signal (including the first reference signal) and the secondary signal in the time domain based on a single carrier in this application;

Figure 10 shows the modulation diagram of the main signal (including the first reference signal) in the frequency domain based on the OFDM waveform in this application;

Figure 11 shows the second schematic flow chart of the signal processing method according to the embodiment of the present application;

Figure 12 shows a schematic design diagram of the second reference signal in the secondary signal according to the embodiment of the present application;

Figure 13 shows the third schematic flow chart of the signal processing method according to the embodiment of the present application;

Figure 14 shows a schematic design diagram for the first reference signal and the second reference signal in the embodiment of the present application;

Figure 15 shows a schematic diagram of layered demodulation of the receiving end device in the embodiment of the present application;

Figure 16 shows one of the module schematic diagrams of the signal processing device according to the embodiment of the present application;

Figure 17 shows the second module schematic diagram of the signal processing device according to the embodiment of the present application;

Figure 18 shows the third module schematic diagram of the signal processing device according to the embodiment of the present application;

Figure 19 shows a structural block diagram of the communication device according to the embodiment of the present application;

Figure 20 shows a structural block diagram of a terminal according to an embodiment of the present application;

Figure 21 shows a structural block diagram of the network side device according to the embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art fall within the scope of protection of this application.

The terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances so that the embodiments of the present application can be practiced in sequences other than those illustrated or described herein, and that "first" and "second" are distinguished objects It is usually one type, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and/or" in the description and claims indicates at least one of the connected objects, and the character "/" generally indicates that the related objects are in an "or" relationship.

It is worth pointing out that the technology described in the embodiments of this application is not limited to Long Term Evolution (LTE)/LTE Evolution (LTE-Advanced, LTE-A) systems, and can also be used in other wireless communication systems, such as code Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access, OFDMA), Single-carrier Frequency Division Multiple Access (SC-FDMA) and other systems. The terms "system" and "network" in the embodiments of this application are often used interchangeably, and the described technology can be used not only for the above-mentioned systems and radio technologies, but also for other systems and radio technologies. The following description describes a New Radio (NR) system for example purposes, and NR terminology is used in much of the following description, but these techniques can also be applied to applications other than NR system applications, such as 6th ^generation Generation, 6G) communication system.

Figure 1 shows a block diagram of a wireless communication system to which embodiments of the present application are applicable. The wireless communication system includes a terminal 11 and a network side device 12. The terminal 11 may be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), or a notebook computer, a personal digital assistant (Personal Digital Assistant, PDA), a palmtop computer, a netbook, or a super mobile personal computer. (ultra-mobile personal computer, UMPC), mobile Internet device (Mobile Internet Device, MID), augmented reality (AR)/virtual reality (VR) equipment, robots, wearable devices (Wearable Device) , Vehicle User Equipment (VUE), Pedestrian User Equipment (PUE), smart home (home equipment with wireless communication functions, such as refrigerators, TVs, washing machines or furniture, etc.), game consoles, personal computers (personal computer, PC), teller machine or self-service machine and other terminal-side devices. Wearable devices include: smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets) bracelets, smart anklets, etc.), smart wristbands, smart clothing, etc. It should be noted that the embodiments of this application are not limited to Determine the specific type of terminal 11. The network side device 12 may include an access network device or a core network device, where the access network device may also be called a radio access network device, a radio access network (Radio Access Network, RAN), a radio access network function or a wireless access network unit. Access network equipment may include a base station, a Wireless Local Area Network (WLAN) access point or a Wireless Local Area Network (WiFi) node, etc. The base station may be called a Node B or an Evolved Node B (Evolved Node B). , eNB), access point, Base Transceiver Station (BTS), radio base station, radio transceiver, Basic Service Set (BSS), Extended Service Set (ESS), home B node, home evolved B node, transmitting receiving point (Transmitting Receiving Point, TRP) or some other suitable term in the field, as long as the same technical effect is achieved, the base station is not limited to specific technical terms, and needs to be explained However, in the embodiment of this application, only the base station in the NR system is used as an example for introduction, and the specific type of the base station is not limited.

In order to enable those skilled in the art to better understand the embodiments of the present application, the following description is provided first.

1. Backscatter communication system;

Backscatter communication (i.e. Backscatter communication) means that backscatter communication devices (such as tags) use radio frequency signals from other devices or the environment to perform signal modulation to transmit their own information. Backscatter communication equipment controls the reflection coefficient Γ of the circuit by adjusting its internal impedance, thereby changing the amplitude, frequency, phase, etc. of the incident signal to achieve signal modulation. The reflection coefficient of the signal can be characterized as:

Among them, Z ₀ is the antenna characteristic impedance, and Z ₁ is the load impedance. Assuming that the incident signal is S _in (t), the output signal is Therefore, corresponding amplitude modulation, frequency modulation or phase modulation can be achieved by reasonably controlling the reflection coefficient. Based on this, backscatter communication equipment can be Backscatter in traditional Radio Frequency Identification (RFID), or passive or semi-passive (Passive/Semi-passive) Internet of Things (IoT).

In a backscatter communication system, there are two main link budgets, namely the forward link and the backscatter link budget, which affect the backscatter communication system performance. In particular, the forward link budget is defined as the amount of power received by the backscatter transmitter, and the backscatter link budget is the amount of power received by the backscatter receiver.

Backscatter communication systems can be divided into three main types: Monostatic Backscatter Communication System (MBCS), Bistatic Backscatter Communication System (BBCS) and ambient backscatter Communication system (Ambient Backscatter Communication System, ABCS).

2. Symbiotic backscattering communication transmission method;

According to the principle of Symbiotic Backscatter, bistatic backscatter communication is generally considered in Passive IoT signal transmission scenarios. If you consider the typical nodes (NR Node B, gNB) and user equipment (User Equipment, UE) in traditional cellular networks, and introduce passive IoT devices (i.e., Tags) into the cellular network, you can mainly consider the following two scenarios , that is, UE-assisted passive IoT scenario.

Scenario-1: gNB sends the primary signal (Primary Signal), x[n]. While receiving the primary signal, the UE also receives Reflect signal to Tag. The Tag reflection signal is modulated by the main signal received by the Tag and the secondary signal (Secondary Signal) B[m] sent by itself.

Scenario-2 is that the UE sends the main signal, x[n], and the gNB receives the main signal and the Tag reflection signal at the same time. The Tag reflection signal is modulated by the main signal received by the Tag and the secondary signal B[m] sent by itself.

As shown in Figure 2, the transmitting end Tx can be a gNB or a UE, and the receiving end Rx can be a corresponding UE or gNB. In the following description, Tx is unified as gNB, and Rx is unified as UE for explanation. When gNB sends the main signal x[n], the signal y[n] received by the UE receiving end can be expressed as:
y[n]=(h ₂ +h ₃ B[m])x[n]+w[n];

Among them, h ₂ is the channel response from gNB to UE, h ₃ is the channel response from gNB reflected to UE through Tag, w[n] is Additive White Gaussian Noise (AWGN) noise, n=0,1, ..., NM-1; m=0,1,...,M-1, and M is the number of symbols of the secondary signal, and N is the number of primary signals for each modulated secondary signal, as shown in Figure 3.

Among them, the main signal x[n] can be transmitted through any waveform such as CDMA, TDMA, Orthogonal Frequency Division Multiplexing (OFDM), etc.

The UE receiving end needs to detect the primary signal x[n] and the secondary signal B[m]. The UE receiving end generally uses coherent reception algorithms, which can be divided into the following types, namely, Maximum-Likelihood (ML) detection algorithm, Linear Detector (Linear Detector) and Successive Interference Cancellation (SIC)-based detection algorithm. The joint detection of the primary signal x[n] and the secondary signal B[m] can be accomplished using these algorithms, but these algorithms have problems of high complexity or low system performance.

3. Passive IoT signal transmission method using beam forming;

If gNB knows the direction or location of Tag, gNB can use the beamforming method to realize Passive IoT signal transmission, as shown in Figure 4. Using the signal received by the UE receiving end after beamforming, y[n], can is approximated as
y[n]≈h ₃ B[m]x[n]+w[n];

It can be seen that the benefit of using beamforming to achieve Passive IoT signal transmission is to increase the Tag communication range and effectively improve energy collection. However, in order to achieve beamforming, the Tag needs to be positioned, which increases the complexity of the transmitter. Generally, this method is used for Passive IoT services with higher QoS requirements.

It should be noted that the signal processing method in the embodiment of the present application can be applied to the above-mentioned Scenario-1 and Scenario-2. For simplicity of explanation, Scenario-1 will be used as an example for description below, and the specific description of Scenario-2 will not be repeated. . Moreover, this application mainly describes centralized symbiotic backscatter communication, but the technology in this application can be extended to other scenarios, such as separated symbiotic backscatter communication.

The signal processing method provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings through some embodiments and their application scenarios.

As shown in Figure 5, this embodiment of the present application provides a signal processing method, including:

Step 501: The sending end device modulates the main signal in the symbiotic backscattering communication signal to obtain the first main signal. Number;

Optionally, each first reference signal corresponds to a resource unit in the modulation block.

Each of the above modulation blocks corresponds to a secondary signal, and M secondary signals can be modulated through the above M modulation blocks.

The above-mentioned sending end device may be a base station or a terminal.

Optionally, the first reference signal is used to recover the phase flip caused by the secondary signal. Optionally, the first reference signal is also used to predict the amplitude and phase information of the channel.

In this embodiment of the present application, the sending end device inserts K first reference signals into each modulation block of the main signal to obtain the first main signal, so that the receiving end device can simply and effectively modify the first reference signal based on the first reference signal. The main signal is coherently demodulated and decoded, and then the secondary signal can be demodulated according to the data of the demodulated first main signal, thereby achieving simple demodulation of the primary signal and the secondary signal in the symbiotic backscatter communication signal. The purpose of the signal.

Optionally, the method also includes:

The sending end device sends the first main signal.

In the embodiment of this application, the symbiotic backscatter communication signal includes a primary signal and a secondary signal. The primary signal x[n] carries modulation symbols based on Quadrature Amplitude Modulation (QAM) through a single carrier or multi-carrier transmission waveform. , and the secondary signal B[m] carries modulation symbols based on Binary Phase Shift Keying (BPSK) through a single carrier or multi-carrier transmission waveform.

It should be noted that the secondary signal can also carry QAM-based modulation symbols, but considering the complexity limit allowed by Tag (or Backscatter Device) in Passive IoT applications, BPSK modulation is mainly used in this application. method to proceed. However, this application can target all modulation methods, such as binary amplitude keying (OOK), QAM, differential amplitude keying (Differential Amplitude Shift Keying, DASK), differential phase shift keying (Differential Phase Shift) Keying (DPSK), Differential Amplitude and Phase-Shift Keying (DAPSK), etc.

In the embodiment of the present application, the above-mentioned modulation block may be a modulation block corresponding to the time domain signal of the main signal, or may be a modulation block corresponding to the frequency domain signal of the main signal. Figure 6 shows a schematic diagram of the modulation of the primary signal and secondary signal in the time domain based on a single carrier. Specifically, the main signal x[n] is composed of a modulation block of length N. Each modulation block is composed of a minimum communication transmission time domain resource unit (can also be described as a resource element), such as a single carrier Pulse. That is, each modulation block includes N resource units. The main signal x[n] is sent from the transmitting end device (here, the base station is taken as an example), is received by the Tag, and modulated by BPSK to generate a secondary signal waveform, and finally backscattered.

Optionally, the size of the modulation block N can be notified to the UE by the gNB through L1 signaling or Media Access Control Element (MAC Control Element, MAC CE) signaling, or it can be carried out through Radio Resource Control (Radio Resource Control, RRC) configuration.

Specifically, the secondary signal B[m] is modulated on the received signal h ₁ x(t) sent from gNB and received by Tag, where , h ₁ is the channel response (Channel Response) from gNB to Tag. In other words, the received signal h ₁ x(t) is used as a communication propagation carrier to transmit the secondary signal B[m]. Therefore, the single-carrier backscattered signal of the secondary signal can be expressed as:

Among them, p _T (t) is the pulse waveform of the backscattered signal, and the signal waveform of x (t) can be a single carrier signal waveform or a multi-carrier signal waveform (such as OFDM waveform).

Further, Tag can use a multi-carrier waveform (eg, OFDM waveform) to perform BPSK modulation and backscatter on the secondary signal B[m]. The advantage of using the OFDM waveform to perform BPSK modulation and backscattering on the secondary signal B[m] is that it can effectively combat the multipath fading effect, thereby improving the UE's reception performance of the backscattered signal.

Figure 7 shows the modulation diagram of the main signal and the secondary signal in the frequency domain based on the OFDM carrier. Specifically, the received main signal is a time domain signal with an OFDM waveform. Tag receives the OFDM time domain signal h ₁ x(t) and converts the time domain signal into a frequency domain signal. There are two methods of converting time domain signals into frequency domain signals. One is to directly convert time domain analog signals into frequency domain signals through Fourier Transform (FT). The other is to first convert the time domain analog signal into a time domain digital signal, and then convert the time domain digital signal into a frequency domain signal through Discrete Fourier Transform (DFT). The difference between the two is different implementation methods, and there is no difference in the final frequency domain signal. The converted received frequency domain signal is expressed as:

in, is the DFT function of length Q, q=0,1,...,Q-1, and Q is the OFDM symbol length, Q=MN.

Specifically, the frequency domain main signal X[q] is divided by modulation blocks of length N. Each modulation block is composed of minimum communication transmission frequency domain resource elements, such as OFDM subcarriers (OFDM Carrier). Tag performs BPSK modulation on the main frequency domain signal X[q] and generates a secondary signal frequency domain signal waveform, which can be expressed as:

Among them, P _T [q] is the waveform of the backscattered signal in the frequency domain.

Then, Tag converts the frequency domain signal X _B [q] into a time domain signal x _B [t] through the IDFT operation, which is expressed as:

in, is the IDFT function of length Q, q=0,1,...,Q-1, and Q is the OFDM symbol length, Q=MN.

Finally, the OFDM time domain signal x _B (t) is backscattered by the Tag to the UE.

Although the demodulation of the main signal by the UE can be solved by the coherent reception algorithm described in the background art, such as ML detection algorithm, linear detection algorithm and SIC-based detection algorithm, its complexity is difficult to be satisfied in the system of related technologies. . Therefore, a more appropriate method is to effectively and simply solve the data demodulation problem of symbiotic backscatter communication through a certain degree of reference signal standardization design.

As a first optional implementation manner, the sending end device modulates the main signal in the symbiotic backscatter communication signal to obtain the first main signal, including:

Obtain the time domain signal corresponding to the main signal;

dividing the time domain signal into one or more modulation blocks;

K first reference signals are inserted into each modulation block corresponding to the time domain signal to obtain the first main signal.

As a second optional implementation manner, the sending end device modulates the main signal in the symbiotic backscattering communication signal to obtain the first main signal, including:

Obtain the frequency domain signal corresponding to the main signal;

Divide the frequency domain signal into one or more modulation blocks;

K first reference signals are inserted into each modulation block corresponding to the frequency domain signal to obtain the first main signal.

Optionally, in the above first optional implementation manner and the second optional implementation manner, the K reference signals in each modulation block correspond to one reference sequence, or the K reference signals in the first main signal K*M reference signals correspond to a reference sequence.

For example, if each modulation block includes two reference signals, the reference sequences corresponding to the two reference signals are 1, -1 or -1, 1, etc. For another example, each modulation block includes 2 reference signals, and M is 3, then the reference sequences corresponding to K*M reference signals may be 1, -1, 1, -1, 1, -1.

Optionally, the K first reference signals are located in the first N resource units of the modulation block, and each of the first reference signals corresponds to one resource unit.

Here, the K first reference signals are placed at the front of each modulation block, so that the receiving end device can first obtain the first reference signal in each modulation block, and then use the first reference signal to analyze the subsequent ones in the modulation block. The data is demodulated. Of course, the K first reference signals can also be placed at any position of each straightening block, such as the last position, or one or more positions in the middle, etc. The selection of positions can be realized according to specific needs. This application will No specific limitation is made.

In addition, when K is greater than 2, the positions of the K first reference signals may be continuous or discontinuous.

Optionally, the method in the embodiment of this application also includes:

At least one of N and K is determined according to L1 signaling, media access control unit MAC CE signaling or radio resource control RRC configuration information.

First, the design of the reference signal related to the main signal in the above two optional implementation methods will be described. The reference signal related to the primary signal is used to recover the phase flip caused by the secondary signal and predict the amplitude and phase information of the channel at the same time. Since the secondary signal is carried on the received primary signal and modulated by a time domain or frequency domain modulation block of length N, each modulation block needs to be allocated at least one resource element (e.g., a pulse of a single carrier) as a reference signal, that is, 1≤K≤N, where K is the number of reference signal resource elements allocated to each modulation block. If the secondary signal is carried and backscattered by a time domain signal, then each time domain modulation block of length N needs to be allocated at least one resource element as a reference signal, that is, 1 ≤ K ≤ N. Similarly, if the secondary signal is carried and backscattered by a frequency domain signal, then each frequency domain modulation block of length N needs to be allocated at least one resource element (such as OFDM subcarrier) as a reference signal, that is, 1≤K ≤N.

Specifically, when each frequency domain modulation block of length N is equipped with N resource elements, that is, when K=N, the main signal will not transmit a data signal, but will completely serve as a carrier signal to carry secondary signal transmission.

It is worth noting that the size of the modulation block N and the number of resource elements K of the reference signal in each modulation block can be notified through L1 signaling or MAC CE signaling, or configured through RRC. In addition, the reference signal in each modulation block The reference sequence can be configured, and the reference sequence configuration can be performed through RRC.

Figure 8 shows an example of a reference signal for the main signal, in which the scenario is set (a) modulation block N=4, and one resource element is allocated to each modulation block N, that is, K=1, (b) modulation block N= 4. One resource element is allocated to each modulation block N, that is, K=2.

It should be noted that since the secondary signal is modulated by BPSK, the BPSK phase inversion factor of each modulation block unit must be considered in channel estimation. Therefore, the UE needs to perform channel estimation in units of modulation blocks, and channel cooperative estimation cannot be performed between modulation blocks. The execution of channel estimation can be simply based on the channel estimation of LS, and the overall channel includes gNB-Tag-UE channel and BPSK modulation phase inversion. Since the modulation block channel collaborative estimation cannot be performed, compared with the minimum mean square error (MMSE) channel collaborative estimation, the signal-to-noise ratio (Signal to Noise Ratio) of the least squares (Least Square, LS) channel estimation, SNR) degradation is about 4dB.

In symbiotic backscatter communication, the secondary signal is modulated by the received primary signal. The primary signal after inserting the reference signal is sent from the gNB, received by the Tag, BPSK modulated and generates the secondary signal waveform, and finally backscattered. Therefore, the waveform used in symbiotic backscatter communication is a single-carrier signal waveform.

It should be noted that for the symbiotic backscattering single carrier signal, the carrier signal waveform of the main signal can be a single carrier time domain signal or a multi-carrier time domain signal.

Figure 9 shows the modulation process of the main signal (including the first reference signal) and the secondary signal in the time domain based on the single carrier signal waveform. That is, the solution shown in Figure 9 corresponds to the first optional implementation method mentioned above. Among them, the main signal modulation block N=4, and each main signal modulation block is inserted into a resource element as a reference signal, that is, K=1. Specifically, gNB inserts the first reference signal into the time domain main signal (the time domain signal corresponding to the main signal), that is, inserts one first reference signal resource element for every three main signal resource elements (that is, K=1), so that A time domain modulation block of length N=4 is formed.

More specifically, gNB sends the primary signal x[n], which is received by Tag, and performs BPSK modulation on the secondary signal data symbols and generates the secondary signal single carrier signal waveform, and finally backscatters.

It is worth noting that for co-occurring backscattered single carrier signals, Tag does not need to be processed by Discrete Fourier Transform (DFT) and Inverse Discrete Fourier Transform (IDFT). Modulation performs time domain processing directly on the received main signal, so the complexity of Tag is relatively low. This symbiotic backscattering method can be viewed as an instant symbiotic backscattering system.

When the gNB uses an omnidirectional antenna to transmit the main signal, the symbiotic backscattered multi-carrier signal y(t) received by the UE receiving end is expressed as:

in, The single-carrier backscatter signal of the sub-signal is defined in Formula 1, h ₂ is the channel response from gNB to UE, h ₃ is the channel response from Tag to UE, and w[n] is the AWGN noise.

In the case where the gNB uses a beamforming antenna to transmit the main signal, the symbiotic backscattered multi-carrier signal y(t) received by the UE receiving end is approximated as:

Figure 10 shows the main signal (including the first reference signal) and the secondary signal in the frequency domain based on the multi-carrier signal waveform. modulation process. The solution shown in Figure 10 corresponds to the above-mentioned second optional implementation manner, in which the main signal modulation blocks N=4, and each main signal modulation block is inserted into a resource element as a reference signal. Specifically, the gNB inserts a reference signal into the frequency domain main signal, that is, inserts one reference signal resource element for every three main signal resource elements (ie, K=1), thereby forming a frequency domain modulation block with a length of N=4.

Specifically, gNB sends the main signal x[n], which is received by Tag. Tag first performs a DFT operation on the received signal h ₁ x(t), so that the time domain signal is converted into a frequency domain signal X[q]. Then the secondary signal data symbols are subjected to BPSK modulation in the frequency domain and the secondary signal multi-carrier signal waveform is generated, and the IDFT operation is performed, and finally backscattered.

It is worth noting that Tag modulates the multi-carrier signal waveform of secondary signal data symbols mainly to combat the multipath fading effect. For symbiotic backscattered multi-carrier signals (such as OFDM signals), Tags need to be processed by DFT and IDFT, so the complexity of Tags is relatively high. In addition, since the processing time delay of DFT and IDFT is at least one OFDM symbol length, this symbiotic backscattering method can be regarded as a non-instantaneous symbiotic backscattering system.

When the gNB uses an omnidirectional antenna to transmit the main signal, the symbiotic backscattered multi-carrier signal y(t) received by the UE receiving end is expressed as:
y(t)＝h ₂ x(tT _Proc )+h ₃ x _B (t)+w(t); Formula 7

Among them, x _B (t) is the single-carrier backscatter signal of the secondary signal defined in Equation 4, w[n] is the AWGN noise, and T _Proc is the total processing time of the DFT and IDFT of the received signal at the Tag receiving end.

In the case where the gNB uses a beamforming antenna to transmit the main signal, the symbiotic backscattered multi-carrier signal y(t) received by the UE receiving end is approximated as:
y(t)≈h ₃ x _B (t)+w(t); Formula 8

Regarding the description of demodulating x[n] and B[m] at the UE receiving end, this application simply assumes that the channel is a single-path channel, and gNB uses an omnidirectional antenna to transmit the main signal, so it passes an analog-to-digital converter (Analog-to -Digital Converter, ADC) The digital signal can be simply expressed as:
y[n]＝h ₂ x[n]+h ₃ B[m]x[n]+w[n]; Formula 9

It is worth noting that if symbiotic backscattering multi-carrier signals are considered and gNB uses an omnidirectional antenna to transmit the main signal, Tag can control the backscattering time when backscattering the secondary signal, such as Tag The secondary signal is backscattered after μNM time after receiving the main signal, that is, during μ OFDM symbols, Tag performs DFT operation on the received main signal, modulation of the secondary signal, IDFT operation, and finally backscattering. Among them, according to the capability of the Tag, the OFDM symbol length NM and the number of OFDM symbols μ can be configured in advance, and the UE receiving end can know in advance the total modulation time of the secondary signal by the Tag, μNM. Therefore, the UE receiving end can effectively eliminate the x[n-μNM] term before detecting x[n] and B[m].

In the case where the gNB transmits the main signal to the omnidirectional antenna, according to Equation 9, the digital signal y[n] received by the UE receiving end is expressed as:
y[n]＝(h ₂ +h ₃ B[m])x[n]+w[n]; Formula 10

If we simply assume that the reference signal occupies the first resource element of each modulation block, the demodulation symbols of the main signal by the UE can be expressed as:

Among them, n=2,3,...,N.

If we simply assume that the transmitted reference signal is 1, that is, x[1]=1, then the UE’s demodulation symbol can be simplified to

Therefore, it is obvious that by setting the reference signal for each modulation block, the UE is able to demodulate the main signal data symbols Finally, the channel decoder (Channel Decoder) is used to decode the bit information of the main signal and obtain the main signal data bit information.

It is worth noting that for co-occurring backscattered single-carrier signals, or co-occurring backscattered multi-carrier signals, or gNB uses beamforming antennas to send main signals, or gNB-Tag, gNB-UE, Tag-UE link channels It is a multipath channel. The UE can demodulate the main signal data symbols through the same demodulation method as above. Specifically, for the co-occurring backscattered single-carrier signal, the UE demodulates the main signal data symbols in the time domain, and for the co-occurring backscattered multi-carrier signal, the UE demodulates the main signal data symbols in the frequency domain. No detailed explanation will be given here.

In the embodiment of the present application, a first reference signal in units of secondary signal modulation blocks is inserted into the time domain signal or frequency domain signal of the main signal, so that the receiving end device can simply and effectively modify the first reference signal based on the first reference signal. The main signal is coherently demodulated and decoded, and then the secondary signal can be demodulated according to the data of the demodulated first main signal, thereby achieving simple demodulation of the primary signal and the secondary signal in the symbiotic backscatter communication signal. The purpose of the signal.

Optionally, in this embodiment of the present application, the sending end device sends the first main signal, including:

Select a first group of transmission configuration information from at least one group of transmission configuration information, each group of transmission configuration information including carrier configuration information and antenna configuration information corresponding to the carrier configuration information;

The first main signal is sent according to the first set of transmission configuration information.

Optionally, the first set of transmission configuration information includes: first single carrier configuration information or first multi-carrier configuration information of the sending end device, second single carrier configuration information of the backscattering communication device, and all the information of the sending end device. configure information to the antenna;

Alternatively, the first set of transmission configuration information includes: first single-carrier configuration information or first multi-carrier configuration information of the transmitting end device, second multi-carrier configuration information of the backscattering communication device, and beamforming of the transmitting end device. Antenna configuration information.

Here, the sending device selects the first set of transmission configuration information based on the carrier configuration information used by the sending device and the carrier configuration information used by the backscatter communication device from at least one set of configuration information. That is, the omnidirectional antenna configuration information of the transmitting end device corresponding to the carrier configuration information used by the transmitting end device and the carrier configuration information used by the backscattering communication device is selected from the above at least one set of configuration information.

Optionally, the method in the embodiment of this application also includes:

The at least one set of transmission configuration information is updated according to the measurement quantity reporting information or the channel change information.

Optionally, the transmission configuration information is associated with at least one of the following:

Business QoS requirements;

Backscatter communications equipment capabilities;

Receiver equipment capabilities;

Sender device capabilities.

In this embodiment of the present application, the at least one set of transmission configuration information may be configured by the base station according to the above content.

Specifically, from the perspective of transmitting antenna configuration, gNB can have an omnidirectional antenna or a beamforming antenna to transmit the main signal x[n]. From the perspective of modulation symbol waveforms, gNB can carry the main signal modulation symbol x[n] through a single carrier or multiple carriers, and Tag can also carry the secondary signal modulation symbol B[m] through a single carrier or multiple carriers. However, how to choose the antenna configuration, main signal transmission waveform, and secondary signal transmission waveform needs to be determined according to the specific business type of Passive IoT. Different Passive IoT business types have different Quality-of-Service (QoS) requirements, and the QoS of each business is determined by the QoS Parameter. For example, QoS parameters can be

Data packet transmission priority (Priority Level);

The maximum allowable delay budget of a data packet (Packet Delay Budget);

Block Error Rate (BLER);

Maximum transmission rate (Maximum Bit Rate, MBR);

Communication Range;

Others etc.

Generally, before the Passive IoT business starts, Tag needs to register with the Passive IoT server through gNB and obtain the Passive IoT server's authentication (Authentication) permission. Therefore, gNB fully knows the services allowed by the Tag (ie, QoS parameters), and also learns the Tag Capability. Therefore, at the Access Stratum Layer, the relevant RRC configuration is first performed for Passive IoT services (i.e., QoS requirements). RRC configuration includes: configuration of QoS parameters, configuration of transmitting antenna, and configuration of gNB (or UE) and Tag carrier bearer. Among them, the configuration of the transmitting antenna and the carrier bearer configuration are determined according to QoS requirements.

The relationship between the carrier bearer configuration of gNB (or UE) and the carrier bearer configuration of Tag is shown in Table 1. As can be seen from Table 1, there are not many restrictions on the combination of carrier bearer configurations, but from an implementation perspective, the consistency of the carrier bearer configuration relationships is different. When the gNB (or UE) is configured to use a single carrier, the tag's carrier bearer configuration can depend on the single carrier bearer (i.e., carrier bearer option one) or on multi-carrier bearer (i.e., carrier bearer option two). When the gNB (or UE) is configured to use multiple carriers, the tag's carrier bearer configuration can rely on either a single carrier bearer (ie, carrier bearer option three) or multiple carrier bearers (ie, carrier bearer option four).

Among them, ◎ means that the carrier bearer configuration relationship between gNB (or UE) and Tag is the most consistent. ○ means that the carrier bearer configuration relationship between gNB (or UE) and Tag can be adopted, but it is not the optimal pairing.

It is worth noting that for carrier carrying option 2, since the main signal is modulated by a single carrier and the secondary signal is modulated by multiple carriers, CP must be added to the time domain signal of the main signal and then sent. The advantage of this is that, like OFDM signals, the receiving end can simply demodulate the signal through a frequency domain equalizer (Frequency Equalization). Frequency domain equalizer technology will not be described in detail in this application.

Each carrier carrying option has certain characteristics. When the tag's allowed capability is relatively low, the tag can only choose carrier bearer option one or carrier bearer option three, depending on the carrier bearer configured by the gNB (or UE) for the main signal. However, when the tag's allowed capability is relatively high, the tag can choose carrier bearer option 2 or carrier bearer option 4.

It is worth noting that if you choose carrier bearer option one and carrier bearer option three, the gNB (or UE) as the receiving end needs to be equipped with a highly complex equalizer to demodulate the co-occurring backscatter signals of the multipath channel. This situation generally applies to QoS services with relatively low requirements. However, if you choose carrier bearer option three or carrier bearer option four, the gNB (or UE) as the receiving end only needs to be equipped with a single-order equalizer (Single Tap Equalization) to counteract the characteristics of multipath channels through frequency domain processing methods to demodulate multiple The co-occurring backscatter signal of the path channel to provide overall co-occurring backscatter communication performance. This situation is generally for QoS services with relatively high requirements.

Table 1

The relationship between gNB antenna configuration and carrier bearer options is shown in Table 2. As can be seen from Table 2, there are certain restrictions on transmitting antenna configurations for different carrier bearer options. For example, when selecting carrier bearer option one and carrier bearer option three, the transmitting antenna configuration can select omnidirectional antenna transmission. However, when selecting carrier bearer option two and carrier bearer option four, the transmitting antenna configuration is best to choose beamforming antenna transmission. This is because, in the case of omnidirectional antenna transmission, the gNB (or UE) receiving end must cancel the signal on the gNB-UE based on the previously demodulated main signal before demodulating the symbiotic backscattered communication signal. This requires relatively high reception complexity for the gNB (or UE) receiving end. Therefore, when selecting carrier bearer option 2 or carrier bearer option 4, the gNB (or UE) transmitter is best to configure beamforming to transmit the main signal in order to reduce the demodulation complexity of the receiver and thereby improve symbiotic backscatter Overall performance of communications. This situation is generally for QoS services with relatively high requirements.

Among them, ◎ means that the transmission combination selected by gNB (or UE) is the most suitable. 0 means that the transmission combination selected by gNB (or UE) is more suitable. △ means that the transmission combination selected by gNB (or UE) can be adopted, but it is not very effective (for example, from the perspective of demodulation complexity at the receiving end, special design methods need to be used).

Table 2

Different transmission combinations can cope with different QoS requirements. When the channel between gNB-Tag-UE changes and cannot meet the QoS requirements of symbiotic backscatter communication, the transmission combination also needs to be changed. For example, in general, gNB The paired Tag and UE will be selected by positioning the Tag and UE. The ideal pairing is to keep the distance between Tag and UE as short as possible, because this can increase the overall channel gain between gNB-Tag-UE.

Generally, the UE has a certain degree of mobility, so when the distance between the Tag and the UE becomes larger, the configured transmission combination needs to be switched. Symbiotic backscatter communication adaptive technology can be considered as a technology that switches transmission combinations according to changes in link channels.

Specifically, the gNB may configure more than two transmission combinations according to service QoS requirements and Tag and/or UE capabilities. Based on the service QoS requirements, gNB selects a suitable transmission combination among the configured transmission combinations. During the service transmission process, gNB can dynamically schedule transmission combinations through L1 signaling or Medium Access Control (MAC) signaling based on the UE's measurement report (Measurement Report) information, and can also be reconfigured through RRC Staticly reconfigure the transmission combination to minimize the complexity of Tag and/or UE while meeting service QoS requirements.

It is worth noting that reducing the complexity of Tag is equivalent to reducing Tag energy consumption. In addition, if the beamforming transmission method is used, it will not only enhance the communication range of the Tag, but also obtain more energy from beamforming.

In the embodiment of the present application, the transmission waveforms of the primary signal and the secondary signal can be effectively and adaptively adjusted according to the service QoS requirements and the mobility of the UE.

In the signal processing method of the embodiment of the present application, the sending end device inserts K first reference signals into each modulation block of the main signal to obtain the first main signal, so that the receiving end device can simply and effectively process the signal based on the first reference signal. The first primary signal is subjected to coherent demodulation and decoding processing, and then the secondary signal can be demodulated according to the data of the demodulated first primary signal, thereby achieving simple demodulation of the primary signal in the symbiotic backscatter communication signal. signal and secondary signal, and can effectively adaptively adjust the transmission waveforms of the primary signal and secondary signal.

As shown in Figure 11, this embodiment of the present application also provides a signal processing method, including:

Step 1101: The backscatter communication device receives the first main signal. The first main signal includes M modulation blocks. Each of the modulation blocks includes K first reference signals, 1≤K≤N, and N is each The number of resource units included in each of the modulation blocks, K is a positive integer, N≥2, and M and N are positive integers;

Step 1102: The backscatter communication device modulates M secondary signals according to the first primary signal to obtain modulated secondary signals.

Optionally, the above-mentioned backscatter communication device may be specifically a Tag.

Optionally, the method further includes: the backscatter communication device sending the modulated secondary signal.

Specifically, the backscatter communication device backscatters the modulated secondary signal.

In the embodiment of the present application, the secondary signal is modulated by the first main signal including the first reference signal, and the modulated secondary signal is obtained and backscattered, so that the receiving end device can simply and effectively process the signal according to the first reference signal. The first primary signal is subjected to coherent demodulation and decoding processing, and then the secondary signal can be demodulated according to the data of the demodulated first primary signal, thereby achieving simple demodulation of the primary signal in the symbiotic backscatter communication signal. Purpose of signals and sub-signals.

Optionally, the M secondary signals include a second reference signal, or include signals with the same length and phase. The opposite of the two second reference signals.

Optionally, the number of resource units corresponding to the second reference signal is the same as the number of resource units corresponding to the P modulation blocks, 1≤P<M/2.

As a third optional implementation manner, the modulation block in the first main signal is a modulation block corresponding to the time domain signal of the main signal;

The backscatter communication device modulates M secondary signals according to the first main signal to obtain modulated secondary signals, including:

According to the modulation block corresponding to the time domain signal of the main signal, the M secondary signals are modulated to obtain modulated secondary signals.

As a fourth optional implementation manner, the modulation block in the first main signal is a modulation block corresponding to the frequency domain signal of the main signal;

Perform discrete Fourier transform DFT processing on the modulation block corresponding to the frequency domain signal of the main signal to obtain the target modulation block;

Modulate the M secondary signals according to the target modulation block to obtain the primary signal;

The primary signal is subjected to an inverse discrete Fourier transform (IDFT) process to obtain a modulated secondary signal.

Optionally, the one second reference signal corresponds to one reference sequence, or the two second reference signals correspond to one reference sequence.

Optionally, the above-mentioned one second reference signal or two second reference signals are located in the first P*N resource elements of the M secondary signals.

In the embodiment of the present application, like the main signal, the demodulated secondary signal also needs to be equipped with a corresponding reference signal (the above-mentioned second reference signal). In symbiotic backscatter communication, Tag modulates each secondary signal data symbol on each modulation block, and then Tag backscatters the secondary signal with a length of M transmission blocks (modulation blocks) to the UE. In order to effectively demodulate the secondary signal data symbols B[m], for each M secondary signals, two second reference signals need to be equipped. The length of each second reference signal is the same as the length corresponding to the P modulation blocks, where P is Integer, 1≤P<M/2. Specifically, since the modulated signal may be a BPSK signal, in the first second reference signal, Tag is modulated on the backscattered reference signal with B[m]=1. In the second second reference signal, Tag is modulated on the backscattered reference signal with B[m]=-1. Among the remaining symbols, Tag modulates the backscattered data symbol B[m], as shown in Figure 12.

It is worth noting that the number of reference signal allocation resource elements related to secondary signals can be notified through L1 signaling or MAC CE signaling, or configured through RRC. Optionally, each second reference signal may additionally have a reference sequence, and the reference sequence configuration may be performed through RRC. However, after the weighted average operation of the two second reference signals configured using the reference sequence, the channel link phase for the Tag-UE must be guaranteed to be opposite.

Similarly, for the description of demodulating x[n] and B[m] at the UE receiving end, this application simply assumes that the channel is a single-path channel, and gNB uses an omnidirectional antenna to transmit the main signal. Therefore, as shown in Equation 9, The digital signal after ADC can be simply expressed as:
y[n]＝(h ₂ +h ₃ B[m])x[n]+w[n]; Formula 13

Using the main signal digital bit information decoded in the above scheme Copy the main signal symbol Then, copy the main signal symbol by The UE first performs a Weighted average processing, that is,

It is worth noting that the estimated main signal and the copied main signal symbol is different. The former has a higher bit error rate, while the latter usually has a very low bit error rate due to the channel coding and decoding gain.

Assuming that the main signal digital symbol demodulation error rate is very small and can be ignored, the weighted average co-occurring backscatter modulation block signal can be approximated as:

in, is the weighted average AWGN noise.

Using the first second reference signal, the UE can simply obtain the following signal:

Using the second second reference signal, the UE can simply obtain the following signal:

By solving the equations composed of Equation 16 and Equation 17, the UE can obtain the channel responses h ₂ and h ₃ . Finally, according to Equation 15, the UE can demodulate the secondary signal data symbols B[m], where m=2P+1,...,M.

It is worth noting that for the demodulation performance of the main signal data symbols, the channel coding gain can be improved by reducing the code rate (ie, Code Rate) of the main signal data symbols. The demodulation performance of secondary signal data symbols can be improved by selecting a larger modulation block N value to increase the processing gain (Processing Gain).

It is worth noting that if gNB uses beamforming to transmit the main signal, since the link gain from gNB to UE is so small that it can be ignored, only one second reference signal needs to be inserted for every M secondary signals to effectively solve the problem. Modulation signal data symbol B[m].

It is worth noting that the secondary signal data modulation method described in this application only needs to be performed through BPSK. In order to ensure coherent detection, secondary signal data transmission needs to be completed by sending a reference signal. Optionally, if the secondary signal data modulation uses DASK, DPSK, or DAPSK differential modulation methods, the secondary system can complete signal demodulation without adding a second reference signal.

As shown in Figure 13, this embodiment of the present application also provides a signal processing method, including:

Step 1301: The receiving end device acquires the first main signal, and performs coherent demodulation and decoding on the first main signal according to the first reference signal in the first main signal to obtain the first main signal. data, the first main signal includes M modulation blocks, each modulation block includes K first reference signals, 1≤K≤N, N is the number of resource units included in each modulation block, K is a positive integer, N≥2, and M and N are positive integers.

In the embodiment of the present application, the receiving end device may be a terminal or a base station. When the sending end device is a base station, the receiving end device is a terminal. When the sending end device is a terminal, the receiving end device is base station.

Step 1302: The receiving end device obtains the symbiotic backscattering modulation block, performs coherent demodulation processing on the symbiotic backscattering modulation block according to the first primary signal, and obtains data in the secondary signal, and M is a positive integer. .

Optionally, the co-occurring backscatter modulation block includes a modulated secondary signal and a noise signal.

It should be noted that in the embodiment of the present application, the first main signal can be acquired first and then the symbiotic backscattering modulation block can be acquired, or the symbiotic backscattering modulation block can be acquired first and then the first main signal can be acquired, or the first main signal can be acquired at the same time. Main signal and co-occurring backscatter modulation blocks. In addition, in the embodiment of the present application, when processing the signal, the first main signal is first demodulated, and then the symbiotic backscattering modulation block is demodulated according to the demodulated first main signal.

In the embodiment of the present application, the receiving end device can simply and effectively perform coherent demodulation and decoding of the first main signal based on the first reference signal in the first main signal, and can further perform coherent demodulation and decoding of the demodulated first main signal based on the first reference signal in the first main signal. The data demodulates the secondary signal, thereby achieving the purpose of simply demodulating the primary signal and secondary signal in the symbiotic backscatter communication signal.

Optionally, perform coherent demodulation and decoding on the first main signal according to the first reference signal in the first main signal to obtain data in the main signal, including:

Coherently demodulate the first main signal according to the first reference signal in the first main signal to obtain a first main signal estimate.

The channel decoder performs bit decoding processing on the first main signal estimated value to obtain the data in the first main signal (ie, the main signal data bit information ).

It should be noted that the process of coherent demodulation and decoding of the first main signal by the receiving end device based on the first reference signal has been described in detail in the embodiment of the transmitting end device and will not be described again here.

Optionally, the modulated secondary signal is obtained by modulating M secondary signals with the first main signal, and the M secondary signals include a second reference signal, or include a second reference signal with the same length and opposite phase. two second reference signals;

Perform coherent demodulation processing on the modulated secondary signal according to the first main signal to obtain data in the secondary signal, including:

Copy the first main signal to obtain the copied main signal

Perform weighted average processing on the co-occurring backscattering modulation block by using the copied main signal to obtain a processed co-occurring backscattering modulation block;

The processed co-occurring back-scattering modulation block is coherently demodulated according to the second reference signal in the processed co-occurring back-scattering modulation block to obtain data in the secondary signal.

It should be noted that the receiving end device performs coherent demodulation processing on the modulated secondary signal according to the first main signal to obtain the data in the secondary signal, which has been carried out in the embodiment of the backscatter communication device. Detailed description will not be repeated here.

In an embodiment of the present application, hierarchical demodulation at the UE receiving end is completed by setting reference signals in the primary signal and the secondary signal respectively. Specifically, for the main signal, the Type-I reference signal (first reference signal) is inserted into the main signal digital symbols to form a modulation block with a length of N=4. For the secondary signal, the Type-II reference signal (second reference signal) is inserted into the digital symbols of the secondary signal to form two second reference signals. The length of each second reference signal is the same as the length of one modulation block, that is, P = 1, as shown in Figure 14. In the hierarchical demodulation process of the digital symbols of the primary signal and the secondary signal, the UE first uses the demodulation method described in the transmitting end device embodiment to demodulate the digital symbols x[n] related to the primary signal, and then uses the backscatter communication equipment to implement The demodulation method described in the example demodulates the digital symbol B[m] associated with the secondary signal.

The hierarchical demodulation method at the UE receiving end is suitable for omnidirectional antenna transmission when T _Proc = 0, or for beamforming transmission when T _Proc ≠ 0. T _Proc is the processing time of DFT and IDFT of the received signal by the Tag receiving end. Regarding the omnidirectional antenna transmission scenario when T _Proc ≠0, no detailed explanation will be given here. Because the UE receiving end only needs to perform cancellation processing on the gNB-UE signal based on the previously demodulated main signal, and then use the same layered demodulation method in the embodiment to demodulate the symbiotic backscatter communication signal.

Figure 15 shows the layered demodulation process at the UE receiving end. The UE receiving end includes a primary signal receiver, a channel decoder, a group signal symbol replicator, a delayer, and a secondary signal receiver.

Where, T in the delayer is the overall processing time of the main signal receiver, channel decoder and main signal symbol replicator. Additionally, whether a DFT block is inserted in an embodiment depends on whether a single carrier or multiple carriers are used.

It is worth noting that if the main signal transmitter inserts a Type-I reference signal for each modulation block in the time domain, and the carrier bearer option is carrier option three, the main signal receiver uses the Type-I reference signal to phase invert the received signal. Finally, the main signal receiver needs to perform a DFT operation to obtain the main signal modulation symbols in the frequency domain.

Specifically, as expressed in Equation 9, the symbiotic backscattering digital signal y[n] received by the UE receiving end can be expressed as
y[n]=(h ₂ +h ₃ B[m])x[n]+w[n];

The main signal receiver demodulates the main signal x[n] according to the reference signal inserted in the main signal to obtain the main signal estimate. Then the information bits are decoded through the channel decoder and the main signal data is obtained

The secondary signal receiver passes through the primary signal data based on the symbiotic backscattered digital signal y[nT] delayed by T. main signal for symbol duplication Obtain the weighted average co-occurrence backscatter modulation block signal. As shown in Equation 15, the co-occurring backscatter modulation block signal can be approximated as

Then, the secondary signal B[m] is demodulated according to the Type-II reference signal inserted in the secondary signal to obtain the secondary signal estimate.

It is worth noting that the estimated main signal and the copied main signal symbol is different. The former has a higher bit error rate, while the latter usually has a very low bit error rate due to channel decoding gain.

In the embodiment of the present application, the receiving end device can simply and effectively respond to the first reference signal in the first main signal. The first main signal is coherently demodulated and decoded, and then the secondary signal can be demodulated according to the data of the demodulated first main signal, thereby achieving simple demodulation of the main signal in the symbiotic backscatter communication signal. and sub-signal purposes.

For the signal processing method provided by the embodiments of the present application, the execution subject may be a signal processing device. In the embodiment of the present application, a signal processing device executing a signal processing method is used as an example to illustrate the signal processing device provided by the embodiment of the present application.

As shown in Figure 16, this embodiment of the present application provides a signal processing device 1600, which is applied to the sending end device and includes:

The first modulation module 1601 is used by the sending end device to modulate the main signal in the symbiotic backscattering communication signal to obtain the first main signal;

Optionally, the device also includes:

The first sending module is used to send the first main signal.

Optionally, the first modulation module includes:

The first acquisition sub-module is used to acquire the time domain signal corresponding to the main signal;

A first dividing submodule, used to divide the time domain signal into one or more modulation blocks;

The second acquisition submodule is used to insert K first reference signals into each modulation block corresponding to the time domain signal to obtain the first main signal.

Optionally, the first modulation module includes:

The third acquisition sub-module is used to acquire the frequency domain signal corresponding to the main signal;

a second dividing submodule, used to divide the frequency domain signal into one or more modulation blocks;

The fourth acquisition sub-module is used to insert K first reference signals into each modulation block corresponding to the frequency domain signal to obtain the first main signal.

Optionally, K reference signals in each modulation block correspond to a reference sequence, or K*M reference signals in the first main signal correspond to a reference sequence.

Optionally, the first sending module includes:

A first selection submodule configured to select a first group of transmission configuration information from at least one group of transmission configuration information, where each group of transmission configuration information includes carrier configuration information and antenna configuration information corresponding to the carrier configuration information;

The first sending sub-module is configured to send the first main signal according to the first set of transmission configuration information.

Business QoS requirements;

Backscatter communications equipment capabilities;

Receiver equipment capabilities;

Sender device capabilities.

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

An update module, configured to update the at least one set of transmission configuration information according to measurement quantity reporting information or channel change information.

The first determination module is used to determine at least one of N and K based on L1 signaling, media access control unit MAC CE signaling or radio resource control RRC configuration information.

In the device of the embodiment of the present application, the sending end device inserts K first reference signals into each modulation block of the main signal to obtain the first main signal, so that the receiving end device can simply and effectively modify the first reference signal based on the first reference signal. A primary signal is coherently demodulated and decoded, and then the secondary signal can be demodulated according to the demodulated data of the first primary signal, thereby achieving simple demodulation of the primary signal and the symbiotic backscattering communication signal. The purpose of the secondary signal.

As shown in Figure 17, this embodiment of the present application also provides a signal processing device 1700, which is applied to backscatter communication equipment, including:

The first receiving module 1701 is used to receive the first main signal. The first main signal includes M modulation blocks. Each of the modulation blocks includes K first reference signals, 1≤K≤N, and N is each The number of resource units included in each of the modulation blocks, K is a positive integer, N≥2, and M and N are positive integers;

The second modulation module 1702 is used to modulate M secondary signals according to the first main signal to obtain modulated secondary signals.

The second sending module is used to send the modulated secondary signal.

Optionally, the M secondary signals include one second reference signal, or two second reference signals with the same length and opposite phases.

Optionally, the modulation block in the first main signal is a modulation block corresponding to the time domain signal of the main signal;

The second modulation module is used to modulate M secondary signals according to the modulation block corresponding to the time domain signal of the main signal to obtain modulated secondary signals.

Optionally, the modulation block in the first main signal is a modulation block corresponding to the frequency domain signal of the main signal;

The second modulation module includes:

The fourth processing submodule is used to perform discrete Fourier transform DFT processing on the modulation block corresponding to the frequency domain signal of the main signal to obtain the target modulation block;

The fifth processing submodule is used to modulate the M secondary signals according to the target modulation block to obtain the first signal;

The sixth processing sub-module is used to perform inverse discrete Fourier transform IDFT processing on the primary signal to obtain a modulated secondary signal.

As shown in Figure 18, this embodiment of the present application also provides a signal processing device 1800, which is applied to the receiving end device and includes:

The first processing module 1801 is used to obtain the first main signal, and perform coherent demodulation and decoding on the first main signal according to the first reference signal in the first main signal to obtain the first main signal. The first main signal includes M modulation blocks, and each modulation block includes K first reference signals, 1≤K≤N, and N is the number of resource units included in each modulation block. Quantity, K is a positive integer, N≥2, and M and N are positive integers;

The second processing module 1802 is used to obtain the symbiotic backscattering modulation block, perform coherent demodulation processing on the symbiotic backscattering modulation block according to the first main signal, and obtain the data in the secondary signal, and M is a positive integer. .

Optionally, the first processing module includes:

A first demodulation submodule, configured to coherently demodulate the first main signal according to the first reference signal in the first main signal to obtain a first main signal estimate;

The first decoding submodule is configured to perform bit decoding processing on the first main signal estimated value through a channel decoder to obtain data in the first main signal.

The second processing module includes:

The first processing sub-module is used to perform copy processing on the first main signal to obtain the copied main signal;

The second processing submodule is used to perform weighted average processing on the symbiotic backscattering modulation block through the copied main signal to obtain the processed symbiotic backscattering modulation block;

The third processing sub-module is used to perform coherent demodulation processing on the processed co-occurring back-scattering modulation block according to the second reference signal in the processed co-occurring back-scattering modulation block to obtain the data in the secondary signal. .

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

The signal processing device provided by the embodiments of the present application can implement each process implemented by the method embodiments in Figures 5 to 15 and achieve the same technical effect. To avoid duplication, details will not be described here.

Optionally, as shown in Figure 19, this embodiment of the present application also provides a communication device 1900, which includes a processor 1901 and a memory 1902. The memory 1902 stores programs or instructions that can be run on the processor 1901, such as , when the communication device 1900 is a terminal, when the program or instruction is executed by the processor m01, each step of the signal processing method embodiment executed by the above-mentioned sending end device, backscattering communication device or receiving end device is implemented, and the same can be achieved. technical effects. When the communication device 1900 is a network-side device, when the program or instruction is executed by the processor 1901, each step of the signal processing method embodiment executed by the sending end device, the backscattering communication device or the receiving end device is implemented, and the same can be achieved. The technical effects will not be repeated here to avoid repetition.

An embodiment of the present application also provides a terminal, including a processor and a communication interface. The processor is configured to modulate the main signal in the symbiotic backscattering communication signal to obtain a first main signal; wherein the first main signal includes M modulation blocks, each modulation block includes K first reference signals, 1≤K≤N, N is the number of resource units included in each modulation block, K is a positive integer, N≥2, and M and N are positive integers;

Alternatively, the communication interface is used to receive a first main signal, the first main signal includes M modulation blocks, each of the modulation blocks includes K first reference signals, 1≤K≤N, N is each The number of resource units included in the modulation block, K is a positive integer, N≥2, and M and N are positive integers. The processor is used to modulate M secondary signals according to the first main signal to obtain the modulated secondary signals. Signal;

Alternatively, the processor is configured to acquire the first main signal, and perform coherent demodulation and decoding processing on the first main signal according to the first reference signal in the first main signal to obtain the data in the first main signal. , the first main signal includes M modulation blocks, each modulation block includes K first reference signals, 1≤K≤N, N is the number of resource units included in each modulation block, K is a positive integer, N≥2, and M and N are positive integers;

Obtain the co-occurring backscattering modulation block, perform coherent demodulation processing on the co-occurring backscattering modulation block according to the first main signal, and obtain data in the secondary signal, and M is a positive integer.

This terminal embodiment corresponds to the above-mentioned method embodiment. Each implementation process and implementation manner of the above-mentioned method embodiment can be applied to this terminal embodiment, and can achieve the same technical effect. Specifically, FIG. 20 is a schematic diagram of the hardware structure of a terminal that implements an embodiment of the present application.

The terminal 2000 includes but is not limited to: radio frequency unit 2001, network module 2002, audio output unit 2003, input unit 2004, sensor 2005, display unit 2006, user input unit 2007, interface unit 2008, memory At least some components in the memory 2009 and the processor 2010 and so on.

Those skilled in the art can understand that the terminal 2000 may also include a power supply (such as a battery) that supplies power to various components. The power supply may be logically connected to the processor 2010 through a power management system, thereby managing charging, discharging, and power consumption through the power management system. Management and other functions. The terminal structure shown in Figure 20 does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown in the figure, or some components may be combined or arranged differently, which will not be described again here.

It should be understood that in the embodiment of the present application, the input unit 2004 may include a graphics processing unit (Graphics Processing Unit, GPU) 20041 and a microphone 20042. The graphics processor 20041 is responsible for the operation of the image capture device (GPU) in the video capture mode or the image capture mode. Process the image data of still pictures or videos obtained by cameras (such as cameras). The display unit 2006 may include a display panel 20061, which may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 2007 includes at least one of a touch panel 20071 and other input devices 20072. Touch panel 20071, also known as touch screen. The touch panel 20071 may include two parts: a touch detection device and a touch controller. Other input devices 20072 may include but are not limited to physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, and joysticks, which will not be described again here.

In this embodiment of the present application, after receiving downlink data from the network side device, the radio frequency unit 2001 can transmit it to the processor 2010 for processing; in addition, the radio frequency unit 2001 can send uplink data to the network side device. Generally, the radio frequency unit 2001 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

Memory 2009 may be used to store software programs or instructions as well as various data. The memory 2009 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, an application program or instructions required for at least one function (such as a sound playback function, Image playback function, etc.) etc. Additionally, memory 2009 may include volatile memory or nonvolatile memory, or memory 2009 may include both volatile and nonvolatile memory. Among them, non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electrically removable memory. Erase programmable read-only memory (Electrically EPROM, EEPROM) or flash memory. Volatile memory can 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 (Synchronous DRAM, 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 memory bus random access memory (Direct Rambus RAM, DRRAM). The memory 2009 in the embodiment of the present application includes, but is not limited to, these and any other suitable types of memory.

The processor 2010 may include one or more processing units; optionally, the processor 2010 integrates an application processor and a modem processor, where the application processor mainly handles operations related to the operating system, user interface, application programs, etc., Modem processors mainly process wireless communication signals, such as baseband processors. It can be understood that the above modem processor may not be integrated into the processor 2010.

In an embodiment of the present application, the sending end device modulates the main signal in the symbiotic backscattering communication signal to obtain the first main signal;

Optionally, the radio frequency unit 2001 is also used to send the first main signal.

Optionally, the processor 2010 is configured to obtain the time domain signal corresponding to the main signal;

dividing the time domain signal into one or more modulation blocks;

Optionally, the processor 2010 is configured to obtain the frequency domain signal corresponding to the main signal;

Divide the frequency domain signal into one or more modulation blocks;

Optionally, the radio frequency unit 2001 is also configured to select a first group of transmission configuration information from at least one group of transmission configuration information, each group of transmission configuration information including carrier configuration information and antenna configuration information corresponding to the carrier configuration information; The first main signal is sent according to the first set of transmission configuration information.

Business QoS requirements;

Backscatter communications equipment capabilities;

Receiver equipment capabilities;

Sender device capabilities.

Optionally, the processor 2010 is configured to update the at least one set of transmission configuration information according to measurement quantity reporting information or channel change information.

Optionally, the processor 2010 is configured to determine at least one of N and K according to L1 signaling, media access control unit MAC CE signaling or radio resource control RRC configuration information.

In an embodiment of the present application, the radio frequency unit 2001 is configured to receive a first main signal, where the first main signal includes M modulation blocks, each modulation block includes K first reference signals, 1≤K≤N, N is the number of resource units included in each modulation block, K is a positive integer, N≥2, And M and N are positive integers;

The processor 2010 is configured to modulate M secondary signals according to the first main signal to obtain modulated secondary signals.

Optionally, the radio frequency unit 2001 is configured to send the modulated secondary signal.

Optionally, the processor 2010 is configured to modulate the M secondary signals according to the modulation block corresponding to the time domain signal of the primary signal to obtain a modulated secondary signal.

Optionally, the processor 2010 is configured to perform discrete Fourier transform DFT processing on the modulation block corresponding to the frequency domain signal of the main signal to obtain a target modulation block; modulate the M secondary signals according to the target modulation block, Obtain the primary signal; perform inverse discrete Fourier transform (IDFT) processing on the primary signal to obtain the modulated secondary signal.

In an embodiment of the present application, the processor 2010 is configured to acquire a first main signal, and perform coherent demodulation and decoding on the first main signal according to a first reference signal in the first main signal, to obtain Data in the first main signal, the first main signal includes M modulation blocks, each modulation block includes K first reference signals, 1≤K≤N, N is each modulation block The number of resource units included in the block, K is a positive integer, N≥2, and M and N are positive integers; obtain the symbiotic backscattering modulation block, and perform the symbiotic backscattering modulation block according to the first main signal. Coherent demodulation processing is used to obtain the data in the secondary signal, and M is a positive integer.

Optionally, the processor 2010 is further configured to coherently demodulate the first main signal according to the first reference signal in the first main signal to obtain a first main signal estimate; use a channel decoder to The first main signal estimated value is subjected to bit decoding processing to obtain the data in the first main signal.

The processor 2010 is also configured to perform copy processing on the first main signal to obtain a copied main signal; perform weighted average processing on the symbiotic backscatter modulation block through the copied main signal to obtain a processed symbiotic backscatter modulation block. a backscattering modulation block; performing coherent demodulation processing on the processed co-occurring back-scattering modulation block according to the second reference signal in the processed co-occurring back-scattering modulation block to obtain data in the secondary signal.

In this embodiment of the present application, the sending end device inserts K first reference signals into each modulation block of the main signal to obtain the first main signal, so that the receiving end device can simply and effectively modify the first reference signal based on the first reference signal. main signal phase Dry demodulation and decoding processing can then demodulate the secondary signal based on the data of the demodulated first primary signal, thereby achieving the purpose of simply demodulating the primary signal and secondary signal in the symbiotic backscattering communication signal. .

Embodiments of the present application also provide a network side device, including a processor and a communication interface. The processor is used to modulate the main signal in the symbiotic backscattering communication signal to obtain a first main signal; wherein, the first main signal Includes M modulation blocks, each modulation block includes K first reference signals, 1≤K≤N, N is the number of resource units included in each modulation block, K is a positive integer, N≥2 , and M and N are positive integers;

This network-side device embodiment corresponds to the above-mentioned method embodiment. Each implementation process and implementation manner of the above-mentioned method embodiment can be applied to this network-side device embodiment, and can achieve the same technical effect.

Specifically, the embodiment of the present application also provides a network side device. As shown in Figure 21, the network side device 2100 includes: an antenna 211, a radio frequency device 212, a baseband device 213, a processor 214 and a memory 215. The antenna 211 is connected to the radio frequency device 212 . In the uplink direction, the radio frequency device 212 receives information through the antenna 211 and sends the received information to the baseband device 213 for processing. In the downlink direction, the baseband device 213 processes the information to be sent and sends it to the radio frequency device 212. The radio frequency device 212 processes the received information and then sends it out through the antenna 211.

The method performed by the transmitting end device or the receiving end device in the above embodiments can be implemented in the baseband device 213, which includes a baseband processor.

The baseband device 213 may include, for example, at least one baseband board on which multiple chips are disposed, as shown in FIG. 21 . One of the chips is, for example, a baseband processor, which is connected to the memory 215 through a bus interface to call the memory 215 . The program executes the operations of the sending device or the receiving device shown in the above method embodiment.

The network side device may also include a network interface 216, which is, for example, a common public radio interface (CPRI).

Specifically, the network side device 2100 in the embodiment of the present application also includes: instructions or programs stored in the memory 215 and executable on the processor 214. The processor 214 calls the instructions or programs in the memory 215 to execute the instructions shown in Figures 16, 17 or 18 shows the implementation method of each module and achieves the same technical effect. To avoid repetition, it will not be repeated here.

Embodiments of the present application also provide a readable storage medium. Programs or instructions are stored on the readable storage medium. When the program or instructions are executed by a processor, each process of the above signal processing method embodiment is implemented and the same can be achieved. skills To avoid repetition, we will not go into details here.

Wherein, the processor is the processor in the terminal described in the above embodiment. The readable storage medium may be non-volatile or non-transient. Readable storage media may include computer-readable storage media, such as computer read-only memory ROM, random access memory RAM, magnetic disks or optical disks.

An embodiment of the present application further provides a chip. The chip includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the above signal processing method embodiments. Each process can achieve the same technical effect. To avoid duplication, it will not be described again here.

It should be understood that the chips mentioned in the embodiments of this application may also be called system-on-chip, system-on-a-chip, system-on-chip or system-on-chip, etc.

Embodiments of the present application further provide a computer program/program product. The computer program/program product is stored in a storage medium. The computer program/program product is executed by at least one processor to implement the above signal processing method embodiment. Each process can achieve the same technical effect. To avoid repetition, we will not go into details here.

Embodiments of the present application also provide a signal processing system, including: a transmitting end device, a backscattering communication device, and a receiving end device. The transmitting end device can be used to perform the signal processing method performed by the transmitting end device as described above. Steps, the backscatter communication device may be used to perform the steps of the signal processing method performed by the backscatter communication device as described above, and the receiving end device may be used to perform the signal processing method performed by the receiving end device as described above. step,.

It should be noted that, in this document, the terms "comprising", "comprises" or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article or device that includes a series of elements not only includes those elements, It also includes other elements not expressly listed or inherent in the process, method, article or apparatus. Without further limitation, an element defined by the statement "comprises a..." does not exclude the presence of additional identical elements in a process, method, article or apparatus that includes that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved. Functions may be performed, for example, the methods described 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.

Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus the necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is better. implementation. Based on this understanding, the technical solution of the present application can be embodied in the form of a computer software product that is essentially or contributes to related technologies. The computer software product is stored in a storage medium (such as ROM/RAM, disk, CD), including several instructions to cause a terminal (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in various embodiments of this application.

The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above-mentioned specific implementations. The above-mentioned specific implementations are only illustrative and not restrictive. Those of ordinary skill in the art will Inspired by this application, many forms can be made without departing from the purpose of this application and the scope protected by the claims, all of which fall within the protection of this application.

Claims

A signal processing method including:

The sending end device modulates the main signal in the symbiotic backscattering communication signal to obtain the first main signal;

Wherein, the first main signal includes M modulation blocks, and each modulation block includes K first reference signals, 1≤K≤N, and N is the number of resource units included in each modulation block, K is a positive integer, N≥2, and M and N are positive integers.
The method of claim 1, further comprising:

The sending end device sends the first main signal.
The method according to claim 1, wherein the sending end device modulates the main signal in the symbiotic backscatter communication signal to obtain the first main signal, including:

Obtain the time domain signal corresponding to the main signal;

dividing the time domain signal into one or more modulation blocks;

K first reference signals are inserted into each modulation block corresponding to the time domain signal to obtain the first main signal.
The method according to claim 1, wherein the sending end device modulates the main signal in the symbiotic backscatter communication signal to obtain the first main signal, including:

Obtain the frequency domain signal corresponding to the main signal;

Divide the frequency domain signal into one or more modulation blocks;

K first reference signals are inserted into each modulation block corresponding to the frequency domain signal to obtain the first main signal.
The method according to claim 1, wherein K reference signals in each modulation block correspond to a reference sequence, or K*M reference signals in the first main signal correspond to a reference sequence.
The method according to claim 2, wherein the sending end device sending the first main signal includes:

Select a first group of transmission configuration information from at least one group of transmission configuration information, each group of transmission configuration information including carrier configuration information and antenna configuration information corresponding to the carrier configuration information;

The first main signal is sent according to the first set of transmission configuration information.
The method according to claim 6, wherein the first set of transmission configuration information includes: first single carrier configuration information or first multi-carrier configuration information of the sending end device, and second single carrier configuration of the backscatter communication device. information and the omnidirectional antenna configuration information of the sending device;

Alternatively, the first set of transmission configuration information includes: first single-carrier configuration information or first multi-carrier configuration information of the transmitting end device, second multi-carrier configuration information of the backscattering communication device, and beamforming of the transmitting end device. Antenna configuration information.
The method of claim 6, wherein the transmission configuration information is associated with at least one of the following:

Business QoS requirements;

Backscatter communications equipment capabilities;

Receiver equipment capabilities;

Sender device capabilities.
The method of claim 6, further comprising:

The at least one set of transmission configuration information is updated according to the measurement quantity reporting information or the channel change information.
The method of claim 1, further comprising:

At least one of N and K is determined according to L1 signaling, media access control unit MAC CE signaling or radio resource control RRC configuration information.
The method according to claim 1, wherein the K first reference signals are located in the first N resource units of the modulation block, and each of the first reference signals corresponds to one resource unit.
A signal processing method including:

The backscatter communication device receives a first main signal, the first main signal includes M modulation blocks, each of the modulation blocks includes K first reference signals, 1≤K≤N, N is each of the The number of resource units included in the modulation block, K is a positive integer, N≥2, and M and N are positive integers;

The backscatter communication device modulates M secondary signals according to the first main signal to obtain modulated secondary signals.
The method of claim 12, further comprising:

The backscatter communication device transmits the modulated secondary signal.
The method according to claim 12, wherein the M secondary signals include one second reference signal, or two second reference signals with the same length and opposite phases.
The method according to claim 14, wherein the number of resource units corresponding to the second reference signal is the same as the number of resource units corresponding to P modulation blocks, 1≤P<M/2.
The method according to any one of claims 12 to 15, wherein the modulation block in the first main signal is a modulation block corresponding to the time domain signal of the main signal;

The backscatter communication device modulates M secondary signals according to the first main signal to obtain modulated secondary signals, including:

According to the modulation block corresponding to the time domain signal of the main signal, the M secondary signals are modulated to obtain modulated secondary signals.
The method according to any one of claims 12 to 15, wherein the modulation block in the first main signal is a modulation block corresponding to the frequency domain signal of the main signal;

The backscatter communication device modulates M secondary signals according to the first main signal to obtain modulated secondary signals, including:

Perform discrete Fourier transform DFT processing on the modulation block corresponding to the frequency domain signal of the main signal to obtain the target modulation block;

Modulate the M secondary signals according to the target modulation block to obtain the primary signal;

The primary signal is subjected to an inverse discrete Fourier transform (IDFT) process to obtain a modulated secondary signal.
The method according to claim 14 or 15, wherein the one second reference signal corresponds to a reference sequence, or the two second reference signals correspond to a reference sequence.
A signal processing method including:

The receiving end device acquires the first main signal, and performs coherent demodulation and decoding processing on the first main signal according to the first reference signal in the first main signal to obtain the data in the first main signal, so The first main signal includes M modulation blocks, each modulation block includes K first reference signals, 1≤K≤N, N is the number of resource units included in each modulation block, and K is a positive Integers, N≥2, and M and N are positive integers;

The receiving end device acquires the symbiotic backscatter modulation block, performs coherent demodulation processing on the symbiotic backscatter modulation block according to the first primary signal, and obtains data in the secondary signal, and M is a positive integer.
The method according to claim 19, wherein performing coherent demodulation and decoding processing on the first main signal according to the first reference signal in the first main signal to obtain the data in the main signal includes:

Perform coherent demodulation on the first main signal according to the first reference signal in the first main signal to obtain a first main signal estimate;

A channel decoder performs bit decoding processing on the first main signal estimated value to obtain data in the first main signal.
The method according to claim 19, wherein the modulated secondary signal is obtained by modulating M secondary signals by a first main signal, and the M secondary signals include a second reference signal, or, Includes two second reference signals of the same length and opposite phases;

Perform coherent demodulation processing on the modulated secondary signal according to the first main signal to obtain data in the secondary signal, including:

Perform copy processing on the first main signal to obtain a copied main signal;

Perform weighted average processing on the co-occurring backscattering modulation block by using the copied main signal to obtain a processed co-occurring backscattering modulation block;

The processed co-occurring back-scattering modulation block is coherently demodulated according to the second reference signal in the processed co-occurring back-scattering modulation block to obtain data in the secondary signal.
A signal processing device, applied to sending end equipment, including:

The first modulation module is used for the sending end device to modulate the main signal in the symbiotic backscatter communication signal to obtain the first main signal;

Wherein, the first main signal includes M modulation blocks, and each modulation block includes K first reference signals, 1≤K≤N, and N is the number of resource units included in each modulation block, K is a positive integer, N≥2, and M and N are positive integers.
The device of claim 22, wherein the device further comprises:

The first sending module is used to send the first main signal.
The device of claim 22, wherein the first modulation module includes:

The first acquisition sub-module is used to acquire the time domain signal corresponding to the main signal;

A first dividing submodule, used to divide the time domain signal into one or more modulation blocks;

The second acquisition submodule is used to insert K first reference signals into each modulation block corresponding to the time domain signal, The first main signal is obtained.
The device of claim 22, wherein the first modulation module includes:

The third acquisition sub-module is used to acquire the frequency domain signal corresponding to the main signal;

a second dividing submodule, used to divide the frequency domain signal into one or more modulation blocks;

The fourth acquisition sub-module is used to insert K first reference signals into each modulation block corresponding to the frequency domain signal to obtain the first main signal.
A signal processing device used in backscatter communication equipment, including:

The first receiving module is used to receive the first main signal. The first main signal includes M modulation blocks. Each of the modulation blocks includes K first reference signals, 1≤K≤N, and N is each The number of resource units included in the modulation block, K is a positive integer, N≥2, and M and N are positive integers;

The second modulation module is used to modulate M secondary signals according to the first main signal to obtain modulated secondary signals.
The device of claim 26, further comprising:

The second sending module is used to send the modulated secondary signal.
A signal processing device, applied to receiving end equipment, including:

The first processing module is used to obtain the first main signal, and perform coherent demodulation and decoding processing on the first main signal according to the first reference signal in the first main signal to obtain the first main signal. data, the first main signal includes M modulation blocks, each modulation block includes K first reference signals, 1≤K≤N, N is the number of resource units included in each modulation block. , K is a positive integer, N≥2, and M and N are positive integers;

The second processing module is used to obtain the co-occurring backscattering modulation block, perform coherent demodulation processing on the co-occurring backscattering modulation block according to the first main signal, and obtain data in the secondary signal, and M is a positive integer.
The device of claim 28, wherein the first processing module includes:

A first demodulation submodule, configured to coherently demodulate the first main signal according to the first reference signal in the first main signal to obtain a first main signal estimate;

The first decoding submodule is configured to perform bit decoding processing on the first main signal estimated value through a channel decoder to obtain data in the first main signal.
The device according to claim 28, wherein the modulated secondary signal is obtained by modulating M secondary signals by a first main signal, and the M secondary signals include a second reference signal, or, Includes two second reference signals of the same length and opposite phases;

The second processing module includes:

The first processing sub-module is used to perform copy processing on the first main signal to obtain the copied main signal;

The second processing submodule is used to perform weighted average processing on the symbiotic backscattering modulation block through the copied main signal to obtain the processed symbiotic backscattering modulation block;

The third processing sub-module is used to perform coherent demodulation processing on the processed co-occurring back-scattering modulation block according to the second reference signal in the processed co-occurring back-scattering modulation block to obtain the data in the secondary signal. .
A communication device, including a processor and a memory, the memory stores a program or instructions that can be run on the processor, and when the program or instructions are executed by the processor, any one of claims 1 to 11 is implemented. The steps of the signal processing method, or the steps of implementing the signal processing method as described in any one of claims 12 to 18, or the steps of implementing the signal processing method as described in any one of claims 19 to 21 .
A readable storage medium storing programs or instructions on the readable storage medium. When the programs or instructions are executed by a processor, the steps of the signal processing method according to any one of claims 1 to 11 are implemented, or, The steps of implementing the signal processing method according to any one of claims 12 to 18, or the steps of implementing the signal processing method according to any one of claims 19 to 21.