WO2023246919A1

WO2023246919A1 - Channel estimation method and apparatus, communication device, system and storage medium

Info

Publication number: WO2023246919A1
Application number: PCT/CN2023/101911
Authority: WO
Inventors: 简荣灵; 姜大洁; 谭俊杰; 黄伟; 杨坤
Original assignee: 维沃移动通信有限公司
Priority date: 2022-06-24
Filing date: 2023-06-21
Publication date: 2023-12-28
Also published as: CN117336121A

Abstract

The present application relates to the technical field of communications, and provides a channel estimation method and apparatus, a communication device, a system and a storage medium. The channel estimation method in embodiments of the present application comprises: a first device receiving a first signal; the first device estimating N first channels on the basis of a signal sequence matrix corresponding to the first signal and a full-rank characteristic of the signal sequence matrix, N being a positive integer, wherein the first signal comprises a second signal and N-1 interference signals, the N first channels comprise a second channel and N-1 interference channels, the second channel is used for transmitting the second signal, and each interference channel is used for transmitting an interference signal.

Description

Channel estimation method, device, communication equipment, system and storage medium

Cross-references to related applications

This application claims priority to Chinese Patent Application No. 202210731464.4 filed in China on June 24, 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 channel estimation method, device, communication equipment, system and storage medium.

Background technique

Currently, in backscatter communication (BSC), the receiving end can demodulate the data of the BSC device from the reflected signal after receiving the reflected signal of the BSC device.

However, due to the existence of interference signals such as direct link signals, carrier leakage signals or environmental reflection signals, and the strength of the interference signals is much greater than the strength of the reflected signals from the BSC equipment, the accuracy of channel estimation at the receiving end will be poor. As a result, the data of the BSC device cannot be correctly demodulated.

Contents of the invention

Embodiments of the present application provide a channel estimation method, device, communication equipment, system and storage medium, which can solve the problem of poor accuracy in channel estimation at the receiving end.

In a first aspect, a channel estimation method is provided. The method includes: a first device receives a first signal; the first device estimates the Nth based on the signal sequence matrix corresponding to the first signal and the full rank characteristics of the signal sequence matrix. One channel, N is a positive integer; where the first signal includes the second signal and N-1 interference signals; the N first channels include the second channel and N-1 interference channels; the second channel is used to transmit the second signal; each interference channel is used to transmit an interference signal.

In a second aspect, a channel estimation device is provided. The channel estimation device includes a receiving module and an estimation module; the receiving module is used to receive a first signal; and the estimation module is used to generate a signal sequence corresponding to the first signal received by the receiving module. matrix, and the full rank characteristics of the signal sequence matrix, estimate N first channels, N is a positive integer; where the first signal includes the second signal and N-1 interference signals; the N first channels include the second channel and N-1 interference channels; the second channel is used to transmit the second signal; each interference channel is used to transmit an interference signal.

In a third aspect, a channel estimation method is provided, which method includes: the second device sends indication information; wherein the indication information is used by the first device to estimate N first channels, where N is a positive integer; the N first channels include The second channel and N-1 interference channels; the second device and the first device are different devices; the second device includes any of the following: network side equipment and relay equipment.

In a fourth aspect, a channel estimation device is provided. The channel estimation device includes a sending module; a sending module configured to send indication information; wherein the indication information is used by the first device to estimate N first channels, and N is a positive integer; The N first channels include second channels and N-1 interference channels; the channel estimation device and the first device are different devices; the channel estimation device includes any of the following: network side equipment and relay equipment.

In a fifth aspect, a communication device is provided. The communication device includes a processor and a memory. The memory stores a program or instructions that can be run on the processor. The program or instructions are implemented when executed by the processor. The steps of the method as described in the first aspect.

In a sixth aspect, a communication device is provided, including a processor and a communication interface, wherein the communication interface is used to receive a first signal, the processor is used to generate a signal sequence matrix corresponding to the first signal, and the signal sequence matrix Full rank characteristics, estimate N first channels, N is a positive integer; where the first signal includes the second signal and N-1 interference signals; the N first channels include the second channel and N-1 interference channels ; The second channel is used to transmit the second signal; each interference channel is used to transmit an interference signal.

In a seventh aspect, a communication device is provided. The communication 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 implemented when executed by the processor. The steps of the method as described in the third aspect.

In an eighth aspect, a communication device is provided, including a processor and a communication interface, wherein the communication interface is used to send indication information; wherein the indication information is used by the first device to estimate N first channels, and N is a positive integer. ;N first channels including the second channel and N-1 interference channels; the second device and the first device are different devices; the second device includes any of the following: network side equipment and relay equipment.

In a ninth aspect, a communication system is provided, including: a first device as described in the first aspect and a second device as described in the third aspect, wherein the communication system can implement the method as described in the first aspect The steps of the channel estimation method, and/or the steps of implementing the channel estimation method as described in the third aspect.

In a tenth 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 as described in the first aspect. The steps of the method described in the third aspect.

In an eleventh 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 a method as described in the third aspect.

In a twelfth 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 The steps of the channel estimation method, or the steps of implementing the channel estimation method as described in the third aspect.

In this embodiment of the present application, the first device can receive the first signal; and can estimate N first channels based on the signal sequence matrix corresponding to the first signal and the full rank characteristics of the signal sequence matrix, where N is a positive integer; Among them, the first signal includes the second signal and N-1 interference signals; the N first channels include the second channel and N-1 interference channels; the second channel is used to transmit the second signal; each interference channel is used to Transmitting an interfering signal. Through this solution, since the first device can estimate N first channels based on the signal sequence matrix corresponding to the received first signal and the full rank characteristics of the signal sequence matrix, that is, the first device can use the second signal and N- The difference between 1 interference signal can accurately estimate the second channel and N-1 interference channels, thus improving the accuracy of channel estimation at the receiving end.

Description of the drawings

Figure 1 is a block diagram of a wireless communication system applicable to the embodiment of the present application;

Figure 2 is a schematic diagram of the BSC architecture;

Figure 3 is a schematic diagram of the hardware structure of the tag;

Figure 4 is a schematic diagram of the transmission link of the BSC system;

Figure 5 is one of the flow charts of a channel estimation method provided by an embodiment of the present application;

Figure 6 is a schematic diagram of a channel estimation method provided by an embodiment of the present application;

Figure 7 is the second flow chart of a channel estimation method provided by an embodiment of the present application;

Figure 8 is one of the structural schematic diagrams of a channel estimation device provided by an embodiment of the present application;

Figure 9 is a second structural schematic diagram of a channel estimation device provided by an embodiment of the present application;

Figure 10 is a schematic diagram of a communication device provided by an embodiment of the present application;

Figure 11 is a schematic diagram of the hardware structure when the communication device provided by the embodiment of the present application is a terminal;

Figure 12 is a schematic diagram of the hardware structure when the communication device provided by the embodiment of the present application is a network-side device.

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. Among them, the terminal 11 can 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 handheld computer, a netbook, or a super mobile personal computer. (ultra-mobile personal computer, UMPC), mobile Internet device (Mobile Internet Device, MID), augmented reality (augmented reality, AR)/virtual reality (VR) equipment, robots, wearable devices (Wearable Device) , vehicle-mounted equipment (VUE), pedestrian terminal (PUE), smart home (home equipment with wireless communication functions, such as refrigerators, TVs, washing machines or furniture, etc.), game consoles, personal computers (personal computers, PC), teller machines or self-service Terminal devices such as mobile phones, wearable devices include: smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart anklets, etc.), Smart wristbands, smart clothing, etc. It should be noted that the embodiment of the present application does not limit the specific type of the terminal 11. The network side equipment 12 may include access network equipment or core network equipment, where the access network equipment may also be called wireless access network equipment, radio access network (Radio Access Network, RAN), radio access network function or wireless access network unit. Access network equipment can include base stations, WLAN access points or WiFi nodes, etc. The base station can be called 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 (TRP) or the above Some other appropriate terminology in the field, as long as the same technical effect is achieved, the base station is not limited to specific technical terms. It should be noted that in the embodiment of this application, only the base station in the NR system is used as an example for introduction. Define the specific type of base station.

The channel estimation method, device, communication equipment, system and storage medium provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings through some embodiments and application scenarios.

BSC means that the BSC device uses radio frequency signals in the environment (for example, cellular signals or WiFi signals, etc.) to collect energy, and loads the information to be sent into the signal in the environment and sends it to the BSC receiving end to achieve passive BSC device and BSC reception. communication between terminals.

Figure 2 shows a schematic diagram of the architecture of the BSC. As shown in (a) of Figure 2, the architecture of the BSC is a single-base BSC architecture. In this architecture, the BSC receiver 21 is both the radio frequency source and the downlink data of the BSC device 22. The transmitting end and the uplink data receiving end of the BSC device 22, the BSC receiving end 21 and the BSC device 22 can communicate directly. It can be seen that although the single-base BSC architecture is simple in architecture and deployment, it is difficult for the BSC receiving end 21 and the BSC device 22. The receiving sensitivity requirements are higher. As shown in (b) of Figure 2, the BSC architecture is a dual-base BSC architecture. In this architecture, the BSC transmitter 25 is both a radio frequency source and a downlink data transmitter of the BSC device 24, and the uplink data of the BSC device 24 The receiving end is the BSC receiving end 23; it should be noted that there are many variations of the dual-base BSC architecture. For example, the radio frequency source can also be the BSC receiving end 23. (b) in Figure 2 only shows one of the architectures. Way.

In the hardware design of BSC, there are no active radio frequency components, and miniature hardware with extremely low power consumption is often used to solve the high energy consumption problem in traditional communications. A tag (i.e. Tag) is a common passive BSC device. Its hardware structure is shown in Figure 3, which mainly includes an energy storage 31, a switch 32, a precoding/modulation module 33, an information decoder 34, etc.; when the Tag receives After receiving the environmental signal, energy can be obtained from the environmental signal and stored in the energy storage 31 to provide energy to the signal processing and signal transmitting hardware modules of the Tag itself. Then, the Tag can The signal is modulated, and the modulated signal is sent to the BSC receiving end through 35 bits of the transmitting antenna, so that communication between the Tag and the BSC receiving end can be achieved.

The specific method of Tag modulating signals is exemplarily described below.

For example, assuming that the impedance of each antenna of Tag1 is Z _A and the i-th load impedance is _Zi , then Z _A can be expressed by the following formula (1), and Z _i can be expressed by the following formula (2) express:

Among them, θ _A is the phase of the antenna, and θ _i is the phase of the i-th load impedance.

If Tag1 has a total of M antennas and N load impedances, M is an integer greater than or equal to 2, and N is a positive integer, then the reflection coefficient Γ _i corresponding to the i-th load impedance Z _i can be expressed by the following formula (3) :

Among them, |Γ _i | can be expressed as the following formula (4), and θ _i can be expressed as the following formula (5):

It can be seen from the above formulas (4) and (5) that the amplitude and phase of the reflection coefficient are related to the selection of the load impedance, that is, the amplitude and phase of the load impedance affect the amplitude and phase of the reflection coefficient. Since the loss of the transmission line will affect the spacing of the constellation points, that is, the greater the loss of the transmission line, the closer the constellation points are to the center in the constellation diagram, the greater the bit error rate; at the same time, the length of the transmission line will also affect the phase of the signal; therefore In addition to changing the phase of the reflection coefficient by switching the load impedance, it is also possible to change the phase of the reflection coefficient using a transmission line. That is, Tag can change the amplitude and phase of the received signal by controlling the switching load impedance or using a transmission line, thereby modulating the signal.

The following is an exemplary explanation of the transmission link of the BSC system in conjunction with the accompanying drawings, taking the BSC receiving end as the NR Node B (gNB) and the BSC transmitting end as the User Equipment (User Equipment, UE) as an example.

Exemplarily, the BSC architectures shown in (a) and (b) of Figure 4 are both dual-base BSC architectures. As shown in (a) of Figure 4, the transmission link of the BSC system may include: gNB41 respectively. The direct link channel between BSC device 42 and UE43, and the BSC cascade channel between BSC device 42 and UE43; as shown in (b) of Figure 4, the transmission link of the BSC system may include: gNB44 and BSC respectively The direct link channel between the device 45 and the UE46, the BSC cascade channel between the BSC device 45 and the UE46, and the reflection channel between the obstacle 47 and the UE46. The BSC architectures shown in (c) and (d) in Figure 4 are both single-base BSC architectures. As shown in (c) in Figure 4, the transmission link of the BSC system may include: between the BSC device 412 and the gNB 411 The BSC cascade channel, and the transmission link of gNB411 from the transmitting end to the receiving end, are represented as interference leakage in the figure; as shown in (d) in Figure 4, the transmission link of the BSC system can include: BSC equipment 414 and gNB413 The BSC cascade channel between gNB413 leaks from the transmitting end to the receiving end, and the reflection channel between the obstacle 415 and gNB413.

In the transmission link of the BSC system, the BSC cascade channel has the following characteristics: 1. Because the BSC equipment can modulate data bits through switches, and the switching rate of the switch will cause the symbol modulation period to appear bursty, and the first channel ( That is, the change speed of direct link channel or reflection channel or the time correlation of the channel is determined by the change speed of the surrounding propagation environment, so the BSC cascade channel changes slowly; 2. Since the BSC equipment modulated data bits are modulated Regular, that is, the channel changes caused by the BSC cascade channel are periodic, while the changes in the first channel are random. Therefore, the BSC cascade channel can be considered unchanged or strongly correlated within the coherence time, and can be considered outside the coherence time. It is considered that the BSC cascade channel is irrelevant or weakly relevant.

Taking the bistatic BSC architecture as an example, the following describes in detail the calculation method of the received signal at the BSC receiver when there is no environmental reflection channel.

For example, assume that in the dual-base BSC architecture, both the network side equipment and the BSC receiving end are multi-antenna equipment, and the downlink transmission channel of the BSC is h' ₀ , the uplink transmission channel of the BSC is h ₁ , and the direct link transmission channel is h ₀ , the transmission signal of the network side device is x(t), and the signal to be modulated by the BSC device is B(t), then the received signal y(t) of the BSC receiving end can be expressed as the following formula (6):
y(t)＝h ₀ x(t)+h ₁ B(t)h' ₀ x(t)＝h ₀ x(t)+h _c B(t)x(t)+n; (6)

Among them, h _c is the BSC cascade channel, and n is the noise.

It can be seen that in the dual-base BSC architecture, the BSC receiving end usually receives the direct link signal and the reflected signal of the BSC equipment. Due to the limitation of the hardware capabilities of the BSC equipment, the intensity of the reflected signal of the BSC equipment is much smaller than that of the direct link signal. The strength of the link signal will therefore cause the modulated data of the BSC device to be submerged in the direct link signal, making it impossible for the BSC receiver to correctly interpret Call up the modulation data of the BSC device. Since the same problem also exists in the single-base BSC architecture, the data demodulation of BSC equipment will be affected by BSC receiver carrier leakage interference and environmental multipath interference. Therefore, correctly estimating the interference channel and BSC cascade channel is the key to solving the above problems. .

In order to solve the above problems, embodiments of the present application provide a channel estimation method. In the channel estimation method provided by the embodiments of the present application, the BSC receiving end (such as the first device in the embodiment of the present application) can receive the first signal; and N first channels can be estimated based on the signal sequence matrix corresponding to the first signal and the full rank characteristics of the signal sequence matrix, where N is a positive integer; where the first signal includes the reflected signal of the BSC device (such as the embodiment of the present application second signal in the system), as well as direct link signals and environmental interference signals (such as N-1 interference signals in the embodiment of the present application); the N first channels include BSC cascade channels (such as the N-1 interference signals in the embodiment of the present application). second channel), as well as the direct link channel and the reflection channel of the environment (such as N-1 interference channels in the embodiment of the present application). Through this solution, since the BSC receiving end can estimate the N first channels based on the signal sequence matrix corresponding to the received first signal and the full rank characteristics of the signal sequence matrix, that is, the BSC receiving end can use the reflected signal of the BSC equipment, And the difference between the direct link signal and the environment's interference signal can accurately estimate the BSC cascade channel, as well as the direct link channel and the environment's reflection channel, thus improving the accuracy of the BSC receiver's channel estimation.

An embodiment of the present application provides a channel estimation method. Figure 5 shows a flow chart of the channel estimation method provided by an embodiment of the present application. As shown in Figure 5, the channel estimation method provided by the embodiment of the present application may include the following steps 501 and 502.

Step 501: The first device receives a first signal.

Optionally, in this embodiment of the present application, the first device may be any device that can receive the first signal, such as a network side device or a UE.

Step 502: The first device estimates N first channels based on the signal sequence matrix corresponding to the first signal and the full rank characteristics of the signal sequence matrix.

In this embodiment of the present application, the first signal includes the second signal and N-1 interference signals, where N is a positive integer.

In this embodiment of the present application, the above-mentioned N first channels include second channels and N-1 interference channels. The second channel is used to transmit the second signal, and each interference channel is used to transmit an interference signal.

The full rank characteristics of the above signal sequence matrix are exemplarily explained below.

For example, assume that the above signal sequence matrix is the following matrix (7):

It can be seen that the signal sequence matrix is a second-order matrix, and the rank (that is, the number of non-zero rows) in the ladder matrix obtained by converting the signal sequence matrix is also 2, that is, the signal sequence matrix is a full-rank matrix. , that is, the signal sequence matrix satisfies the full rank characteristic.

For a specific description of the full-rank characteristics, please refer to the relevant descriptions in related technologies. To avoid repetition, they will not be described again here.

Optionally, in this embodiment of the present application, the second signal may be: a signal modulated by the backscatter communication device based on the indication information.

Optionally, in the embodiment of this application, the backscatter communication device may be any of the following: Passive Internet of Things (ie Passive-IOT) device, Environmental Internet of Things (ie Ambient IOT) device, and tag.

It can be understood that the backscatter communication device modulates the second signal based on the above indication information, which can ensure the full rank characteristics of the above signal sequence matrix.

Optionally, in this embodiment of the present application, when the second signal is a signal modulated by the backscatter communication device based on the above indication information, the second channel may be a BSC cascade channel.

The specific description of the above indication information will be described in detail in the following embodiments, and will not be described again in order to avoid repetition.

In the embodiment of the present application, since the second signal can be a signal modulated by the backscatter communication device based on the indication information, the full rank characteristics of the signal sequence matrix corresponding to the first signal including the second signal can be ensured, so that the first device The above N first channels can be estimated correctly.

Optionally, in this embodiment of the present application, the N-1 interference channels may include at least one of the following: direct link channels; carrier leakage channels; and environmental reflection channels.

Optionally, in this embodiment of the present application, the N-1 interference channels may correspond to the N-1 interference signals one-to-one.

Optionally, in this embodiment of the present application, if the N-1 interference channels include direct link channels, the N-1 interference signals may include direct link signals; if the N-1 interference channels include carrier leakage channel, then the above N-1 interference signals can to include carrier leakage signals; if the above-mentioned N-1 interference channels include environmental reflection channels, the above-mentioned N-1 interference signals may include environmental reflection signals.

Optionally, in this embodiment of the present application, in the single-base BSC architecture, the N-1 interference channels may include environmental reflection channels and carrier leakage channels.

Optionally, in this embodiment of the present application, in the dual-base BSC architecture, the N-1 interference channels may include environmental reflection channels and direct link channels.

In the embodiment of the present application, since the above N-1 interference channels may include at least one of a direct link channel, a carrier leakage channel, and an environmental reflection channel, the first device can estimate different interference channels in different scenarios. , thereby enriching the application scenarios of the first device channel estimation.

Optionally, in this embodiment of the present application, the above-mentioned signal sequence matrix may be: a matrix composed of signal sequences of each of the first signals received within N first periods.

In this embodiment of the present application, the number of first cycles is the same as the number of channels to be estimated, that is, N first channels correspond to N first cycles.

For example, assuming that the above-mentioned N first channels include: BSC cascade channel and direct link channel, then the above-mentioned N first periods are 2 first periods, so the first device can jointly operate in the 1st first period and the 1st first period. The second signal and the direct link signal received in the two first cycles respectively, and based on the above signal sequence matrix and the full rank characteristics of the signal sequence matrix, the BSC cascade channel and the direct link channel are estimated.

It can be understood that the above-mentioned N first periods can ensure the full rank characteristics of the signal sequence matrix corresponding to the first signal including N signals.

Optionally, in this embodiment of the present application, the N first periods may be preconfigured, predefined, or determined according to preset rules.

In the embodiment of the present application, since the above-mentioned signal sequence matrix can be: a matrix composed of the signal sequences of each of the first signals received within N first periods, the full rank characteristics of the signal sequence matrix can be ensured. , thereby improving the accuracy of channel estimation.

Optionally, in this embodiment of the present application, each element in the above-mentioned signal sequence matrix can be used to represent: a transmitting device of one of the first signals, corresponding to one of the above-mentioned N first periods. symbol status.

Optionally, in this embodiment of the present application, the above symbol state may include any of the following: +1, 0, -1.

For example, assume that the transmitting device of the above signal is a BSC device, and the modulation method of the BSC device is Binary Phase Shift Keying (BPSK), and it is a bipolar code, that is, there are bipolar codes between different bits. Sexually, then, bit 0 represents 0-degree phase modulation, and the BSC device corresponds to the +1 state at this time; bit 1 represents 180-degree phase modulation, and the BSC device corresponds to the -1 state.

For another example, assume that the transmitting device of the above signal is a BSC device, and the modulation method of the BSC device is binary on-off keying (OOK) and is a unipolar code. Then, if the BSC device is to be If the modulated data bit is 1, the symbol state corresponding to the BSC device is +1; if the data bit to be modulated by the BSC device is 0, the symbol state corresponding to the BSC device is 0.

The channel estimation method provided by the embodiment of the present application is exemplarily described below.

For example, assuming that the first signal includes a direct link signal and a BSC reflected signal, and the transmitting device of the direct link signal is a network side device, and the transmitting device of the BSC reflected signal is a BSC device, then, if the above signal sequence matrix is the above (7), then the element "+1" in the first row and first column of the signal sequence matrix can represent the corresponding symbol state of the network side device in the first first period; the first element of the signal sequence matrix The element "+1" in the second column of a row can represent the corresponding symbol state of the BSC device in the first first period; the element "+1" in the second row and first column of the signal sequence matrix can represent The corresponding symbol state of the network-side device in the second first cycle; the element "-1" in the second row and second column of the signal sequence matrix can represent the corresponding symbol state of the BSC device in the second first cycle. Symbol status.

It should be noted that when the first signal includes N signals, the signal sequence matrix corresponding to the first signal is an N-order matrix.

In the embodiment of the present application, since each element in the above-mentioned signal sequence matrix can be used to characterize: the transmitting device of one of the first signals, the corresponding symbol state in one of the above-mentioned N first periods , so through this signal sequence The matrix can facilitate the calculation of channel estimation by the first device, thereby improving the rate at which the first device estimates the channel.

Optionally, in this embodiment of the present application, one of the N first periods may include at least one symbol period.

Optionally, in this embodiment of the present application, the above-mentioned first period may be one symbol period, or may be a period composed of multiple symbol periods.

In the embodiment of the present application, since the above-mentioned first period may include at least one symbol period, the composition of the first period can be enriched, thereby improving the flexibility of channel estimation.

Optionally, in this embodiment of the present application, the above step 502 can be specifically implemented through the following step 502a.

Step 502a: Based on the signal sequence matrix and the full rank characteristics of the signal sequence matrix, the first device performs channel estimation on the first signals received within N first periods to obtain N first channels.

Optionally, in the embodiment of the present application, the first device can determine the symbol status of the signal received in each first period through the above formula (6) and in combination with the symbol status of different transmitting devices in the same first period in the above signal sequence matrix. Equations, and the N equations determined simultaneously can be estimated to obtain the above N first channels.

It should be noted that in actual implementation, the first device can also jointly design the channel estimation criterion in combination with the BSC interference cancellation technology. In a first period, as long as the carrier signal and the BSC modulated signal are convolved or related to a constant after calculation, The interference channel and the BSC cascade channel can be estimated; this is not limited in the embodiment of this application.

In the embodiment of the present application, because the first device can perform channel estimation on the first signals received within N first periods based on the signal sequence matrix and the full-rank characteristics of the signal sequence matrix, and obtain N first channels, Therefore, the accuracy of estimating the N first channels can be improved by combining the signals received within the N symbol periods.

For example, assume that the UE (i.e., the first device) receives the direct link signal transmitted by the network side device and the BSC reflection signal (i.e., the first signal) transmitted by the BSC device, and the signal sequence matrix corresponding to the received signal is: (7) above, then the UE can substitute the corresponding symbol states of the network side device and the BSC device in the first first period into the above formula (6) to obtain the signal received in the first first period. , expressed as the following formula (8):
y ₁ (T ₁ )=h ₀ +h _c ; (8)

And the symbol status corresponding to the network side device and the BSC device in the second first period can be substituted into the above formula (6) to obtain the signal received in the second first period, expressed as the following formula ( 9):
y ₂ (T ₂ )=h ₀ -h _c ; (9)

Therefore, the UE can combine the signals received within two symbol periods, that is, the simultaneous equations (8) and (9), to estimate the direct link channel h ₀ and the BSC cascade channel h _c .

Figure 6 shows the frame structure transmission process in the above example, in which the pilot sequence is used for synchronization or to carry the above indication information; the interval time T is caused by the symbol modulation delay of the BSC equipment.

As another example, assume that the UE (i.e., the first device) receives the direct link signal transmitted by the network side device and the BSC reflection signal (i.e., the first signal) transmitted by the BSC device, and the signal sequence matrix corresponding to the received signal is It can be expressed as the following matrix (10):

Then, the UE can substitute the corresponding symbol states of the network side device and the BSC device in the first first period into the above formula (6) to obtain the signal received in the first first period, expressed as follows Formula (11) of:
y ₁ (T ₁ )=h ₀ +h _c ; (11)

And the symbol status corresponding to the network side device and the BSC device in the second first period can be substituted into the above formula (6) to obtain the signal received in the second first period, expressed as the following formula ( 12)：
y ₂ (T ₂ )=h ₀ ; (12)

Therefore, after estimating the direct link channel h ₀ , the UE can combine the signals received within two symbol periods, that is, the joint public Formula (11) and Formula (12) are used to estimate the BSC cascade channel h _c .

In addition, if the symbol status corresponding to the network side device and the BSC device in the first first cycle is +1, 0, the UE can directly obtain the direct link channel information first, which is suitable for direct link interference cancellation scenarios. Specifically, the following transmission process can exist:

a. The network side device sends continuous wave (CW) to the BSC device, and at the same time configures the BSC device's silent time, modulation method and modulation type;

b. The BSC device receives CW and wakes up;

c. The BSC remains silent, and the network side device estimates the direct link channel through the above formula (11);

d. The network side device sends CW to the BSC device and sends a pilot sequence for synchronization or cascade channel estimation;

e. The BSC device modulates data and reflects the modulated data to the UE;

f. The UE eliminates direct link interference based on the estimated direct link channel in c above, and demodulates the BSC signal.

It should be noted that, for the above-mentioned N first channels, the first device may be based on a matrix composed of signal sequences of each of the first signals received within the N first periods, and the full range of the signal sequence matrix. Rank characteristics, and through the corresponding received signal formula, channel estimation is performed on the first signals received within the N first periods to obtain the N first channels.

For example, in a scenario that includes environmental reflection interference, the signal sequence matrix corresponding to the first signal received by the first device within 3 first periods may be the following matrix (11):

Then, if the first signal is the environmental reflection signal, carrier leakage signal and BSC reflection signal received by the first device in the single-base BSC architecture, then the first column (i.e. +1, +1, +1) can be the symbol state corresponding to the environmental reflection channel in the 3 first periods; the second column (i.e. +1, +1, +1) in the matrix (11) can be the carrier leakage channel in the 3rd period. The corresponding symbol status within one cycle; the third column (ie -1, 0, -1) in the matrix (11) can be the corresponding symbol status of the BSC cascade channel within the three first cycles.

If the first signal is the direct link signal, environmental reflection signal and BSC reflection signal received by the first device in the dual-base BSC architecture, then the first column (i.e. +1, +1, + 1) It can be the symbol state corresponding to the direct link channel in the 3 first periods; the second column (i.e. +1, +1, +1) in the matrix (11) can be the environmental reflection channel in the 3rd period. The corresponding symbol status within one cycle; the third column (ie -1, 0, -1) in the matrix (11) can be the corresponding symbol status of the BSC cascade channel within the three first cycles. Similarly, the signal sequence matrix corresponding to the first signal received by the first device within 3 first cycles can also be the matrix obtained by deforming the above matrix (11), as long as the deformed matrix satisfies the full rank characteristics (that is, the sequence of the interfering channel is consistent in different first cycles).

For example, the above matrix (11) can be transformed into any of the following matrices:

For the method of estimating the channel based on the above-mentioned matrix (11) or a deformed matrix of the matrix (11), reference may be made to the relevant descriptions in the above-mentioned embodiments. In order to avoid repetition, the details will not be described here again.

In the channel estimation method provided by the embodiment of the present application, since the first device can estimate based on the signal sequence matrix corresponding to the received first signal and the full rank characteristics, row orthogonal characteristics or column orthogonal characteristics of the signal sequence matrix, N first channels, that is, the first device can use the difference between the second signal and N-1 interference signals to accurately estimate the second channel and N-1 interference channels, thus improving the accuracy of channel estimation at the receiving end. .

Optionally, in this embodiment of the present application, before the above-mentioned step 502, the channel estimation method provided by the embodiment of the present application may also include the following step 503 or step 504, then this step 502 may be specifically implemented through the following step 502b. .

Step 503: The first device receives indication information from the second device.

In this embodiment of the present application, the second device and the first device are different devices.

In this embodiment of the present application, the second device includes any one of the following: a network side device and a relay device.

Optionally, in this embodiment of the present application, the above indication information may be carried through any of the following: Downlink Control Information (DCI); Medium Access Control Layer Control Element (MAC CE) ); leader sequence.

In the embodiment of the present application, since the above indication information can be carried through any one of DCI, MAC CE and preamble sequence, the flexibility of the first device in receiving the indication information can be improved.

Optionally, in this embodiment of the present application, the above indication information may be used to indicate at least one of the following:

(1.1) Modulation method of backscatter communication equipment;

(1.2) Modulation sequence of backscatter communication equipment;

(1.3) N first cycles;

(1.4) The polarity level of the carrier sequence sent by the second device.

In the embodiment of the present application, since the above indication information can be used to indicate at least one of the above (1.1) to (1.4), the flexibility of the indication content of the indication information can be improved, so that different content can be indicated in different application scenarios. , to meet the needs of channel estimation.

Optionally, in the embodiment of the present application, in the above (1.1), the modulation method of the backscatter communication device may include at least one of the following: amplitude modulation; phase modulation.

Optionally, in this embodiment of the present application, if the modulation method of the backscatter communication device includes amplitude modulation, the above indication information may indicate the amplitude of the modulated signal of the backscatter communication device; if the modulation method of the backscatter communication device If the modulation method includes phase modulation, the above indication information may indicate the phase of the modulated signal of the backscatter communication device; if the modulation method of the backscatter communication device includes amplitude modulation and phase modulation, the above indication information may indicate the backscatter communication device. The device modulates the amplitude and phase of the signal.

Optionally, in the embodiment of the present application, the modulation method of the backscatter communication device can also be any modulation method that can make the signal sequence matrix satisfy the above full rank characteristic, which is not limited in the embodiment of the present application.

In the embodiment of the present application, since the modulation mode of the backscatter communication device may include at least one of amplitude modulation and phase modulation, the flexibility of the indication content of the above indication information can be further improved.

Optionally, in the embodiment of the present application, in the above (1.2), the modulation sequence of the backscatter communication device may include at least one of the following: an amplitude modulation sequence; a phase modulation sequence.

Optionally, in this embodiment of the present application, the modulation sequence can be divided into different sequence subsets according to the above modulation method, and each sequence subset is used to indicate a type of modulation sequence.

It can be understood that the above-mentioned amplitude modulation sequence corresponds to the above-mentioned amplitude modulation, and the above-mentioned phase modulation sequence corresponds to the above-mentioned phase modulation; if the above-mentioned modulation method can also include other modulation methods, the above-mentioned modulation sequence can also include the corresponding modulation sequence.

Optionally, in this embodiment of the present application, the first device may determine the modulation mode of the corresponding backscatter communication device based on a subset of sequences included in the received indication information.

In the embodiment of the present application, since the modulation sequence of the backscatter communication device may include at least one of an amplitude sequence and a phase sequence, the flexibility of the indication content of the above indication information can be further improved.

Optionally, in this embodiment of the present application, in the above (1.3), the above indication information may indicate the N first periods of required channel estimation according to different BSC architecture scenarios.

Optionally, in the embodiment of the present application, in the above (1.4), the polarity level may include: a unipolar level or a bipolar level.

Step 504: The first device sends indication information to the backscatter communication device.

In this embodiment of the present application, the above indication information is used to indicate the modulation parameters of the modulation signal of the backscatter communication device.

For a detailed description of the above instruction information, please refer to the relevant description in the above step 503. To avoid repetition, the details will not be described again here.

It can be understood that in the embodiment of the present application, the first device sends instruction information to the backscatter communication device, which can be applied to the scenario of the above-mentioned single-base BSC architecture, that is, the first device is a network-side device and at the same time the first device is a BSC receiver. end.

Step 502b: The first device estimates N first channels based on the signal sequence matrix, the full rank characteristics of the signal sequence matrix, and the indication information.

Optionally, in this embodiment of the present application, after receiving the above indication information, the first device may learn that the indication information indicates Therefore, when performing channel estimation, the symbol status corresponding to different transmitting devices in each first cycle can be determined based on the indication information, and the above-mentioned N-th signals can be estimated by combining the signals received in the above-mentioned N first cycles. One channel.

It should be noted that if the second device and the first device are the same device, for example, in the above-mentioned single-base BSC architecture, the first device does not need to receive the above indication information.

In the embodiment of the present application, since the first device can receive the indication information sent by the second device, or send the indication information to the backscattering communication device, and can according to the above-mentioned signal sequence matrix, the full rank characteristics of the signal sequence matrix, and the The indication information estimates N first channels. Therefore, through the content indicated by the indication information, the rate and accuracy of channel estimation by the first device can be improved.

This embodiment of the present application provides a channel estimation method. Figure 7 shows a flow chart of the channel estimation method provided by this embodiment of the present application. As shown in Figure 7, the channel estimation method provided by the embodiment of the present application may include the following step 701.

Step 701: The second device sends instruction information.

In this embodiment of the present application, the above indication information is used by the first device to estimate N first channels, where N is a positive integer.

In this embodiment of the present application, the N first channels include second channels and N-1 interference channels.

Optionally, in this embodiment of the present application, the second channel may be used to transmit signals modulated by the backscatter communication device based on the above indication information.

Optionally, in this embodiment of the present application, the above indication information may be carried through any of the following: DCI; MAC CE; preamble sequence.

Modulation methods for backscatter communication equipment;

Modulation sequences for backscatter communications equipment;

N first cycles;

The polarity level of the carrier sequence sent by the second device.

Wherein, the above-mentioned N first periods are related to estimating the above-mentioned N first channels.

Optionally, in this embodiment of the present application, the modulation method of the backscatter communication device may include at least one of the following: amplitude modulation; phase modulation.

Optionally, in this embodiment of the present application, the modulation sequence of the backscatter communication device includes at least one of the following: an amplitude modulation sequence; a phase modulation sequence.

In the channel estimation method provided by the embodiment of the present application, since the second device can send indication information for the first device to estimate N first channels, the first device can estimate N first channels based on the indication information. The second channel and N-1 interference channels in , thus improving the accuracy of the estimated channel.

For other descriptions in the embodiments of the present application and the technical effects achieved by each technical feature, please refer to the relevant descriptions in the above-mentioned channel estimation method embodiments. To avoid duplication, they will not be described again here.

For the channel estimation method provided by the embodiments of the present application, the execution subject may be a channel estimation device. In the embodiment of the present application, the channel estimation device performing the channel estimation method is taken as an example to illustrate the channel estimation device provided by the embodiment of the present application.

With reference to FIG. 8 , this embodiment of the present application provides a channel estimation device 80 , which may include a receiving module 81 and an estimation module 82 . The receiving module 81 may be used to receive the first signal. The estimation module 82 may be configured to estimate N first channels based on the signal sequence matrix corresponding to the first signal received by the receiving module 81 and the full rank characteristics of the signal sequence matrix, where N is a positive integer. Wherein, the first signal includes the second signal and N-1 interference signals; the N first channels include the second channel and N-1 interference channels; the second channel is used to transmit the second signal; each interference channel is to transmit an interfering signal.

In a possible implementation, the above signal sequence matrix may be: a matrix composed of signal sequences of each of the first signals received within N first periods.

In a possible implementation, each element in the above signal sequence matrix can be used to represent: one of the first signals The signal transmitting device corresponds to the symbol state within a first cycle.

In a possible implementation, the estimation module 82 may be specifically configured to perform channel estimation on the first signals received within the N first periods based on the above-mentioned signal sequence matrix and the full-rank characteristics of the signal sequence matrix, Obtain the above N first channels.

In a possible implementation, a first period may include at least one symbol period.

In a possible implementation, the receiving module 81 may also be used to estimate the N first channels from The second device receives the indication information. The estimation module 82 may be specifically configured to estimate the N first channels based on the signal sequence matrix, the full rank characteristics of the signal sequence matrix, and the indication information. Wherein, the second device and the first device are different devices; the second device includes any of the following: a network side device and a relay device.

In a possible implementation, the channel estimation device 80 may also include a sending module. The sending module may be configured to send indication information to the backscattering communication device before the estimating module 82 estimates the N first channels based on the signal sequence matrix corresponding to the first signal and the full rank characteristics of the signal sequence matrix. The indication information is used to indicate the modulation parameters of the modulation signal of the backscatter communication device. The estimation module 82 may be specifically configured to estimate the N first channels based on the signal sequence matrix, the full rank characteristics of the signal sequence matrix, and the indication information.

In a possible implementation, the second signal may be a signal modulated based on the above indication information.

In a possible implementation, the above indication information may be used to indicate at least one of the following: the modulation method of the backscatter communication device; the modulation sequence of the backscatter communication device; the above-mentioned N first periods; The polarity level of the carrier sequence.

In a possible implementation, the modulation method of the backscatter communication device may include at least one of the following: amplitude modulation; phase modulation.

In a possible implementation, the modulation sequence of the backscatter communication device may include at least one of the following: an amplitude modulation sequence; a phase modulation sequence.

In a possible implementation, the above indication information may be carried through any of the following: DCI; MAC CE; preamble sequence.

In a possible implementation, the above N-1 interference channels may include at least one of the following: direct link channels; carrier leakage channels; and environmental reflection channels.

In the channel estimation device provided by the embodiment of the present application, since the channel estimation device can estimate N first channels based on the signal sequence matrix corresponding to the received first signal and the full rank characteristics of the signal sequence matrix, that is, the channel The estimating device can accurately estimate the second channel and the N-1 interference channels by utilizing the difference between the second signal and the N-1 interference signals, thereby improving the accuracy of channel estimation at the receiving end.

The channel estimation 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 channel estimation apparatus provided by the embodiments of the present application can implement each process implemented by the method embodiments in Figures 5 to 6 and achieve the same technical effect. To avoid duplication, details will not be described here.

With reference to FIG. 9 , this embodiment of the present application provides a channel estimation device 90 , which may include a sending module 91 . The sending module 91 may be used to send indication information; wherein the indication information is used by the first device to estimate N first channels, where N is a positive integer; the N first channels include second channels and N-1 interference channels ; The channel estimation device 90 and the first device are different devices; the channel estimation device 90 includes any one of the following: network side equipment and relay equipment.

In a possible implementation, the above indication information can be used to indicate at least one of the following: the modulation method of the backscatter communication device; the modulation sequence of the backscatter communication device; N first periods; the carrier sent by the second device The polarity level of the sequence. Wherein, the N first periods are related to estimating the above N first channels.

In a possible implementation, the modulation method of the backscatter communication device may include at least one of the following: amplitude modulation system; phase modulation.

In a possible implementation, the second channel is used to transmit a signal modulated based on the above indication information.

In the channel estimation device provided by the embodiment of the present application, the channel estimation device can send instruction information for the first device to estimate N first channels, so that the first device can estimate N first channels based on the instruction information. The second channel and N-1 interfering channels in the channel can therefore improve the accuracy of the estimated channel.

The channel estimation device provided by the embodiment of the present application can implement each process implemented by the method embodiment in Figure 7 and achieve the same technical effect. To avoid duplication, details will not be described here.

Optionally, as shown in Figure 10, this embodiment of the present application also provides a communication device 100, which includes a processor 101 and a memory 102. The memory 102 stores programs or instructions that can be run on the processor 101, such as , when the communication device 100 is the above-mentioned first device, when the program or instruction is executed by the processor 101, each process of the method embodiment in FIG. 5 to FIG. 6 is implemented, and the same technical effect can be achieved. When the communication device 100 is the above-mentioned second device, when the program or instruction is executed by the processor 101, each process of the method embodiment in Figure 7 is implemented, and the same technical effect can be achieved. To avoid duplication, the details will not be described here.

Embodiments of the present application also provide a communication device, including a processor and a communication interface. The communication interface is used to receive a first signal. The processor is used to estimate based on the signal sequence matrix corresponding to the first signal and the full rank characteristics of the signal sequence matrix. N first channels, N is a positive integer; where the first signal includes the second signal and N-1 interference signals; the N first channels include the second channel and N-1 interference channels; the second channel is used The second signal is transmitted; each interference channel is used to transmit an interference signal.

This communication device embodiment corresponds to the above-mentioned method embodiment of Figures 5 to 6. Each implementation process and implementation manner of the method embodiment of Figures 5 to 6 can be applied to this communication device embodiment, and can achieve the same technical effects. Specifically, the communication device may be a terminal, or may be a network-side device; taking the communication device as a terminal as an example, FIG. 11 is a schematic diagram of the hardware structure of the terminal.

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

Those skilled in the art can understand that the terminal 1000 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 1010 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 FIG. 11 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 1004 may include a graphics processing unit (Graphics Processing Unit, GPU) 10041 and a microphone 10042. The graphics processor 10041 is responsible for 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 1006 may include a display panel 10061, which may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 1007 includes at least one of a touch panel 10071 and other input devices 10072 . Touch panel 10071, also known as touch screen. The touch panel 10071 may include two parts: a touch detection device and a touch controller. Other input devices 10072 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 the downlink data from the network side device, the radio frequency unit 1001 can transmit it to the processor 1010 Perform processing; in addition, the radio frequency unit 1001 can send uplink data to the network side device. Generally, the radio frequency unit 1001 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

Memory 1009 may be used to store software programs or instructions as well as various data. The memory 1009 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 1009 may include volatile memory or nonvolatile memory, or memory 1009 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 1009 in the embodiment of the present application includes, but is not limited to, these and any other suitable types of memory.

The processor 1010 may include one or more processing units; optionally, the processor 1010 integrates an application processor 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 1010.

Among them, the radio frequency unit 1001 can be used to receive the first signal. The processor 1010 may be configured to estimate N first channels based on the signal sequence matrix corresponding to the first signal received by the radio frequency unit 1001 and the full rank characteristics of the signal sequence matrix, where N is a positive integer. Wherein, the first signal includes the second signal and N-1 interference signals; the N first channels include the second channel and N-1 interference channels; the second channel is used to transmit the second signal; each interference channel is to transmit an interfering signal.

In a possible implementation, each element in the above signal sequence matrix can be used to characterize: a transmitting device of one of the first signals, and the corresponding symbol state within a first period.

In a possible implementation, the processor 1010 may be configured to perform channel estimation on the first signal received within the N first periods based on the above-mentioned signal sequence matrix and the full-rank characteristics of the signal sequence matrix, Obtain the above N first channels.

In a possible implementation, the radio frequency unit 1001 may also be used to estimate the above-mentioned N first channels based on the signal sequence matrix corresponding to the first signal and the full-rank characteristics of the signal sequence matrix by the processor 1010. The second device receives the indication information. The processor 1010 may be specifically configured to estimate the N first channels according to the signal sequence matrix, the full rank characteristic of the signal sequence matrix, and the indication information. Wherein, the second device and the first device are different devices; the second device includes any of the following: a network side device and a relay device.

In a possible implementation, the radio frequency unit 1001 can also be used to estimate the N first channels before the processor 1010 estimates the above-mentioned N first channels based on the signal sequence matrix corresponding to the first signal and the full rank characteristics of the signal sequence matrix. The backscatter communication device sends indication information, and the indication information is used to indicate the modulation parameter of the modulation signal of the backscatter communication device. The processor 1010 may be specifically configured to estimate the N first channels according to the signal sequence matrix, the full rank characteristic of the signal sequence matrix, and the indication information.

Taking the above communication device as a network-side device as an example, FIG. 12 is a schematic diagram of the hardware structure of the network-side device. As shown in FIG. 12 , the network side device 1200 includes: an antenna 121 , a radio frequency device 122 , a baseband device 123 , a processor 124 and a memory 125 . The antenna 121 is connected to the radio frequency device 122 . In the uplink direction, the radio frequency device 122 receives information through the antenna 121 and sends the received information to the baseband device 123 for processing. In the downlink direction, the baseband device 123 processes the information to be sent and sends it to the radio frequency device 122. The radio frequency device 122 processes the received information and then sends it out through the antenna 121.

The method performed by the network side device in the above embodiment can be implemented in the baseband device 123, which includes a baseband processor.

The baseband device 123 may include, for example, at least one baseband board on which multiple chips are disposed, as shown in FIG. Program to perform the network device operations shown in the above method embodiments.

The network side device may also include a network interface 126, which is, for example, a common public radio interface (CPRI).

Specifically, the network side device 1200 in the embodiment of the present application also includes: instructions or programs stored in the memory 125 and executable on the processor 124. The processor 124 calls the instructions or programs in the memory 125 to execute each of the steps shown in Figure 8. The method of module execution and achieving the same technical effect will not be described in detail here to avoid duplication.

The radio frequency device 122 may be used to receive the first signal. The processor 124 may be configured to estimate N first channels based on the signal sequence matrix corresponding to the first signal received by the radio frequency device 122 and the full rank characteristics of the signal sequence matrix, where N is a positive integer. Wherein, the first signal includes the second signal and N-1 interference signals; the N first channels include the second channel and N-1 interference channels; the second channel is used to transmit the second signal; each interference channel is to transmit an interfering signal.

In a possible implementation, the processor 124 may be specifically configured to perform channel estimation on the first signals received within the N first periods based on the above-mentioned signal sequence matrix and the full-rank characteristics of the signal sequence matrix, Obtain the above N first channels.

In a possible implementation, the radio frequency device 122 may also be used to estimate the N first channels from The second device receives the indication information. The processor 124 may be specifically configured to estimate the N first channels based on the signal sequence matrix, the full rank characteristics of the signal sequence matrix, and the indication information. Wherein, the second device and the first device are different devices; the second device includes any of the following: a network side device and a relay device.

In a possible implementation, the radio frequency device 122 may also be configured to estimate the N first channels before the processor 124 estimates the above-mentioned N first channels based on the signal sequence matrix corresponding to the first signal and the full rank characteristics of the signal sequence matrix. The backscatter communication device sends indication information, and the indication information is used to indicate the modulation parameter of the modulation signal of the backscatter communication device. The processor 124 may be specifically configured to estimate the N first channels based on the signal sequence matrix, the full rank characteristics of the signal sequence matrix, and the indication information.

In the communication device provided by the embodiment of the present application, since the communication device can estimate N first channels based on the signal sequence matrix corresponding to the received first signal and the full rank characteristics of the signal sequence matrix, that is, the communication device can The difference between the second signal and the N-1 interference signals is used to accurately estimate the second channel and the N-1 interference channels, thus improving the accuracy of channel estimation at the receiving end.

The communication equipment provided by the embodiments of the present application can implement each process of the above method embodiments in Figures 5 to 6 and achieve the same technical effect. To avoid duplication, details will not be described here.

Embodiments of the present application also provide a communication device, including a processor and a communication interface. The communication interface is used to send indication information; wherein the indication information is used by the first device to estimate N first channels, where N is a positive integer; One channel includes a second channel and N-1 interference channels; the second device and the first device are different devices; the second device includes any of the following: network side equipment and relay equipment. This communication device embodiment corresponds to the above-mentioned method embodiment in Figure 7. Each implementation process and implementation manner of the method embodiment in Figure 7 can be applied to this communication device embodiment, and can achieve the same technical effect. Specifically, the communication device may be a terminal, or may be a network-side device; taking the communication device as a terminal as an example, FIG. 11 is a schematic diagram of the hardware structure of the terminal.

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

Memory 1009 may be used to store software programs or instructions as well as various data. The memory 1009 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 1009 may include volatile memory or nonvolatile memory, or memory 1009 may include both volatile and nonvolatile memory. Among them, the 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 Access memory (Direct Rambus RAM, DRRAM). The memory 1009 in the embodiment of the present application includes, but is not limited to, these and any other suitable types of memory.

The radio frequency unit 1001 may be used to send indication information; wherein the indication information is used by the first device to estimate N first channels, where N is a positive integer; the N first channels include second channels and N-1 Interference channel; the terminal 1000 and the first device are different devices.

The radio frequency device 122 may be used to send indication information; wherein the indication information is used by the first device to estimate N first channels, where N is a positive integer; the N first channels include second channels and N-1 Interference channel; the network side device 1200 and the first device are different devices.

In the communication device provided by the embodiment of the present application, the communication device can send instruction information for the first device to estimate N first channels, so that the first device can estimate one of the N first channels based on the instruction information. second channel and N-1 interference channels, so the accuracy of the estimated channel can be improved.

The communication device provided by the embodiment of the present application can implement each process of the above-mentioned method embodiment in Figure 7 and achieve the same technical effect. To avoid duplication, the details will not be described 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 channel estimation method embodiment is implemented and the same can be achieved. The technical effects will not be repeated here to avoid repetition.

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

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 channel estimation method embodiment. 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 channel estimation method embodiment. Each process can achieve the same technical effect. To avoid repetition, we will not go into details here.

An embodiment of the present application also provides a communication system, including: a first device and a second device as described in the above embodiments. The communication system can implement each process of the above channel estimation method embodiment, and can achieve the same technical effect. To avoid repetition, details will not be described here.

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 the existing technology. 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 channel estimation method, the method includes:

The first device receives the first signal;

The first device estimates N first channels based on the signal sequence matrix corresponding to the first signal and the full rank characteristics of the signal sequence matrix, where N is a positive integer;

Wherein, the first signal includes the second signal and N-1 interference signals;

The N first channels include second channels and N-1 interference channels;

The second channel is used to transmit the second signal;

Each interference channel is used to transmit one interference signal.
The method according to claim 1, wherein the signal sequence matrix is a matrix composed of signal sequences of each of the first signals received within N first periods.
The method according to claim 2, wherein each element in the signal sequence matrix is used to represent: a transmitting device of one of the first signals, a corresponding symbol state in one of the first periods .
The method according to claim 2 or 3, wherein the first device estimates N first channels based on the signal sequence matrix corresponding to the first signal and the full rank characteristics of the signal sequence matrix, including:

The first device performs channel estimation on the first signal received within the N first periods based on the signal sequence matrix and the full rank characteristics of the signal sequence matrix, and obtains the Nth One channel.
The method according to claim 2 or 3, wherein one said first period includes at least one symbol period.
The method according to claim 1, wherein before the first device estimates N first channels based on the signal sequence matrix corresponding to the first signal and the full rank characteristics of the signal sequence matrix, the method Also includes:

The first device receives indication information from the second device;

The first device estimates N first channels based on the signal sequence matrix corresponding to the first signal and the full rank characteristics of the signal sequence matrix, including:

The first device estimates the N first channels based on the signal sequence matrix, the full rank characteristics of the signal sequence matrix, and the indication information;

Wherein, the second device and the first device are different devices; the second device includes any of the following: a network side device and a relay device.
The method according to claim 1, wherein before the first device estimates N first channels based on the signal sequence matrix corresponding to the first signal and the full rank characteristics of the signal sequence matrix, the method Also includes:

The first device sends indication information to the backscatter communication device, where the indication information is used to indicate the modulation parameter of the modulation signal of the backscatter communication device;

The first device estimates N first channels based on the signal sequence matrix corresponding to the first signal and the full rank characteristics of the signal sequence matrix, including:

The first device estimates the N first channels based on the signal sequence matrix, the full rank characteristic of the signal sequence matrix, and the indication information.
The method of claim 1, wherein the second signal is a signal modulated based on indication information.
The method according to any one of claims 6 to 8, wherein,

The indication information is used to indicate at least one of the following:

Modulation methods for backscatter communication equipment;

Modulation sequences for backscatter communications equipment;

N first cycles;

The polarity level of the carrier sequence sent by the second device.
The method according to claim 9, wherein the modulation method of the backscatter communication device includes at least one of the following: amplitude modulation; phase modulation.
The method according to claim 9, wherein the modulation sequence of the backscatter communication device includes at least one of the following: an amplitude modulation sequence; a phase modulation sequence.
The method according to any one of claims 6 to 8, wherein the indication information is carried by any of the following of: downlink control information DCI; media access control layer control unit MAC CE; preamble sequence.
The method according to claim 1, wherein the N-1 interference channels include at least one of the following: a direct link channel; a carrier leakage channel; and an environmental reflection channel.
A channel estimation method, the method includes:

The second device sends instruction information;

Wherein, the instruction information is used by the first device to estimate N first channels, where N is a positive integer; the N first channels include second channels and N-1 interference channels;

The second device and the first device are different devices; the second device includes any one of the following: a network side device and a relay device.
The method of claim 14, wherein

The indication information is used to indicate at least one of the following:

Modulation methods for backscatter communication equipment;

Modulation sequences for backscatter communications equipment;

N first cycles;

The polarity level of the carrier sequence sent by the second device;

Wherein, the N first periods are related to estimating the N first channels.
The method according to claim 15, wherein the modulation method of the backscatter communication device includes at least one of the following: amplitude modulation; phase modulation.
The method according to claim 15, wherein the modulation sequence of the backscatter communication device includes at least one of the following: an amplitude modulation sequence; a phase modulation sequence.
The method of claim 15, wherein one of said first periods includes at least one symbol period.
The method according to any one of claims 15 to 18, wherein the indication information is carried through any of the following: DCI; MAC CE; preamble sequence.
The method of claim 14, wherein the second channel is used to transmit a signal modulated based on the indication information.
The method according to claim 14, wherein the N-1 interference channels include at least one of the following: a direct link channel; a carrier leakage channel; and an environmental reflection channel.
A channel estimation device, the device includes a receiving module and an estimation module;

The receiving module is used to receive the first signal;

The estimating module is configured to estimate N first channels based on the signal sequence matrix corresponding to the first signal received by the receiving module and the full rank characteristics of the signal sequence matrix, where N is a positive integer;

Wherein, the first signal includes the second signal and N-1 interference signals;

The N first channels include second channels and N-1 interference channels;

The second channel is used to transmit the second signal;

Each interference channel is used to transmit one interference signal.
A channel estimation device, the device includes a sending module;

The sending module is used to send indication information;

Wherein, the instruction information is used by the first device to estimate N first channels, where N is a positive integer; the N first channels include second channels and N-1 interference channels;

The channel estimation device and the first device are different devices; the channel estimation device includes any of the following: network side equipment and relay equipment.
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 13 is implemented. The steps of the channel estimation method described in the item.
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 14 to 21 is implemented. The steps of the channel estimation method described in the item.
A readable storage medium storing programs or instructions on the readable storage medium. When the programs or instructions are executed by a processor, the channel estimation method according to any one of claims 1 to 13 is implemented, or the channel estimation method is implemented as follows: The steps of the channel estimation method according to any one of claims 14 to 21.