WO2022078331A1 - 信号发送和信号接收方法、终端及通信设备 - Google Patents

信号发送和信号接收方法、终端及通信设备 Download PDF

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Publication number
WO2022078331A1
WO2022078331A1 PCT/CN2021/123300 CN2021123300W WO2022078331A1 WO 2022078331 A1 WO2022078331 A1 WO 2022078331A1 CN 2021123300 W CN2021123300 W CN 2021123300W WO 2022078331 A1 WO2022078331 A1 WO 2022078331A1
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signal
spreading sequence
sequence
spreading
processor
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English (en)
French (fr)
Inventor
魏旭昇
姜大洁
秦飞
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Vivo Mobile Communication Co Ltd
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Vivo Mobile Communication Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference

Definitions

  • the present application belongs to the field of communication technologies, and in particular relates to a signal transmission and signal reception method, a terminal and a communication device.
  • Backscatter technology is a passive or low-energy technology, and its technical feature is that it can transmit its own information by directly reflecting the surrounding environment signals.
  • environmental backscatter technology uses surrounding radio frequency signals and does not require specific spectrum resources; the transmission of radio frequency signals and the reception of backscattered signals are generally not the same device; the backscattering device can collect surrounding signals. Its own energy storage to further support its own communication. Due to the above technical characteristics of environmental backscattering technology, it is one of the key technologies to realize 6G green communication, reduce the energy loss of communication systems, and promote energy conservation and environmental protection.
  • the inventor found that when the existing environmental backscattering technology is applied, the receiving end will be interfered by the interference signal.
  • the backscattering device in the environmental backscattering technology is usually a passive device or an energy-limited device, the device tag does not send a pilot/training signal to the receiving end, and the receiving end cannot use the pilot/training signal according to the existing method. Eliminate distractions. Therefore, how to eliminate interference and improve the success rate of environmental backscatter communication is an urgent problem to be solved.
  • Embodiments of the present application provide a signal transmission and signal reception method, a terminal, and a communication device, which can solve the problem of interference of interfering signals in the existing environmental backscattering technology.
  • a signal sending method applied to a communication device, including:
  • the product of the first spreading sequence and the second spreading sequence is a third spreading sequence
  • the inner product of the third spreading sequence and the first spreading sequence is 0.
  • a signal sending device including:
  • a receiving module configured to receive a first signal, where the first signal is obtained by spreading based on a first spreading sequence
  • a processing module configured to superimpose the local signal on the first signal based on the second spreading sequence, and perform backscatter transmission
  • the product of the first spreading sequence and the second spreading sequence is a third spreading sequence
  • the inner product of the third spreading sequence and the first spreading sequence is 0.
  • a signal receiving method applied to a terminal, including:
  • the second signal is that after the backscattering tag receives the first signal, the local signal is superimposed on the first signal based on the second spread spectrum sequence, and the backscattering transmission is performed.
  • the product of the first spreading sequence and the second spreading sequence is a third spreading sequence
  • the inner product of the third spreading sequence and the first spreading sequence is 0.
  • a signal receiving apparatus comprising:
  • a sending module configured to send a first signal, where the first signal is obtained by spreading based on a first spreading sequence
  • the receiving module is configured to receive a second signal, and the second signal is that after receiving the first signal, the backscattering tag superimposes the local signal on the first signal based on the second spreading sequence, and performs sent by backscatter;
  • a processing module configured to despread the second signal based on the third spreading sequence
  • the product of the first spreading sequence and the second spreading sequence is a third spreading sequence
  • the inner product of the third spreading sequence and the first spreading sequence is 0.
  • a communication device comprising a processor, a memory, and a program or instruction stored on the memory and executable on the processor, when the program or instruction is executed by the processor, The steps of implementing the method for transmitting a signal according to the first aspect above are implemented.
  • a terminal including a processor, a memory, and a program or instruction stored on the memory and executable on the processor.
  • the program or instruction is executed by the processor, the The steps of the signal receiving method according to the third aspect above.
  • a readable storage medium is provided, and a program or an instruction is stored on the readable storage medium, and when the program or instruction is executed by a processor, the signal sending method as described in the first aspect above is implemented, or The steps of implementing the signal receiving method as described in the third aspect above.
  • a chip in an eighth aspect, includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used for running programs or instructions of an environmental backscattering device or a terminal, corresponding to The steps of implementing the signal sending method as described in the first aspect above, or implementing the signal receiving method as described in the third aspect.
  • the first spreading sequence and the second spreading sequence are respectively used to perform spread spectrum processing on the signal at the transmitting end and the reflected signal of the environmental scattering device, and the third spreading sequence is obtained based on the two spreading sequences.
  • the frequency sequence is used for despreading the received signal at the receiving end, which can effectively eliminate the interference signal and improve the reliability of the signal.
  • FIG. 1 is a block diagram of an environmental backscatter communication system according to an embodiment of the present application
  • FIG. 2 is a schematic flowchart of a signal sending method provided by an embodiment of the present application
  • FIG. 3 is a schematic structural diagram of a signal transmission apparatus provided by an embodiment of the present application.
  • FIG. 4 is a schematic flowchart of a signal receiving method provided by an embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of a signal receiving apparatus provided by an embodiment of the present application.
  • FIG. 6 is a schematic diagram of an entity structure of a communication device provided by an embodiment of the present application.
  • FIG. 7 is a schematic diagram of a hardware structure of a communication device implementing an embodiment of the present application.
  • FIG. 8 is a schematic diagram of a hardware structure of a terminal implementing an embodiment of the present application.
  • first, second and the like in the description and claims of the present 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”, “second” distinguishes Usually it is a class, and the number of objects is not limited.
  • the first object may be one or multiple.
  • the technologies described in the embodiments of the present application are not limited to Long Term Evolution (Long Term Evolution, LTE)/LTE Evolution (LTE-Advanced, LTE-A) systems or New Radio (New Radio, NR) systems, It can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), orthogonal frequency Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA) and other systems.
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA orthogonal frequency Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single-carrier Frequency-Division Multiple Access
  • NR New Radio
  • FIG. 1 shows a block diagram of an ambient backscatter communication system to which the embodiments of the present application can be applied.
  • the ambient backscatter communication system includes a terminal 11 and an ambient backscatter device 12 .
  • the terminal 11 may also be called a terminal device, a receiving end or a user terminal (User Equipment, UE), and the terminal 11 may be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer) or a notebook computer , Personal Digital Assistant (PDA), PDA, Netbook, Ultra-mobile Personal Computer (UMPC), Mobile Internet Device (MID) or Vehicle-mounted Equipment (VUE), Pedestrian Terminal (PUE) and other terminal side equipment.
  • PDA Personal Digital Assistant
  • UMPC Ultra-mobile Personal Computer
  • MID Mobile Internet Device
  • VUE Vehicle-mounted Equipment
  • PUE Pedestrian Terminal
  • the environmental backscattering device 12 is a smart device with a backscattering function, capable of backscattering ambient radio frequency signals, such as a wearable device (Wearable Device). glasses etc. It should be noted that the specific types of the terminal 11 and the environmental backscattering device 12 are not limited in the embodiments of the present application.
  • the sending of the ambient radio frequency signal and the reception of the backscattered signal are performed by the same device terminal 11 , that is, the external ambient radio frequency signal is directly sent by the transmitting end of the backscattered signal receiving device terminal 11 signal acts as. That is to say, the terminal 11 includes a signal transmitting end and a signal receiving end at the same time: the signal transmitting end sends out a radio frequency signal, which can be used as an environmental radio frequency signal;
  • the environmental backscattering device 12 with backscattering function After receiving the signal from the transmitting end, the environmental backscattering device 12 with backscattering function reflects and transmits the received environmental radio frequency signal according to the reflection rule defined by itself, and sends out backscattering signal to transmit its own information.
  • the backscattered signal sent by the environmental backscattering device 12 is received by the terminal 11. While receiving the useful reflected signal, the terminal 11 will be affected by the self-interference generated by the self-transmitted signal at the receiving end, and at the same time, the transmitted signal will be affected by the surrounding environment. The influence of the interfering signal reaching the receiving end after reflection.
  • FIG. 2 is a schematic flowchart of a signal sending method provided by an embodiment of the present application.
  • the method can be applied to a communication device, and the communication device may be an ambient backscatter (ambient backscatter) device.
  • the type of equipment can include: bracelets, earphones, glasses, etc.
  • the method includes:
  • Step 201 Receive a first signal, where the first signal is obtained by spreading based on a first spreading sequence.
  • the execution subject of the embodiment of the present application may be an environmental backscattering device, which has a backscattering function and can receive an environmental radio frequency signal from the environment, and the environmental radio frequency signal may be referred to as a first signal.
  • the first signal is sent by a radio frequency signal sending device (the terminal 11 shown in FIG. 1 ) in the environment around the environmental backscattering device, and the radio frequency signal sending device needs to use a radio frequency signal before sending the first signal.
  • the chip signal to be sent (such as the signal x(t) in FIG. 1 ) is subjected to spreading processing to obtain the first signal.
  • the specific spreading sequence may be referred to as the first spreading sequence.
  • backscattering is the reflection of waves, particles or signals back from the direction they came from, and is diffuse reflection due to scattering.
  • the backscattering device is usually a passive device or an energy-limited device, which can communicate by reflecting the radio frequency signal of the surrounding environment, and the signal reflected by the backscattering device is called the backscattering signal .
  • the backscattering device tag expresses the two states of 0 or 1 by reflecting or not reflecting the surrounding radio frequency signal.
  • the backscattering signal receiving device judges the two states according to the difference in the received signal when the tag reflects or does not reflect. state, and then detect the original 0 or 1 information sent by the tag.
  • Spread spectrum refers to a communication technology that spreads the spectrum of the signal to be sent to a wider bandwidth than its original bandwidth.
  • the expansion of the frequency band is completed by an independent code sequence, which is realized by the method of coding and modulation.
  • the code sequence is the spreading sequence.
  • the spread spectrum sequence is equivalent to the carrier of the signal to be sent in the coded modulation, and acts as a carrier.
  • Step 202 based on the second spreading sequence, superimpose the local signal on the first signal, and perform backscatter transmission.
  • the product of the first spreading sequence and the second spreading sequence is the third spreading sequence, and the inner product of the third spreading sequence and the first spreading sequence is 0.
  • the backscattering device after receiving the first signal according to the above steps, the backscattering device superimposes the local signal on the first signal, and further spreads the superimposed signal with another spreading sequence to form a reverse The scattered signal is sent out.
  • the other spreading sequence used by the backscattering device may be referred to as the second spreading sequence.
  • the signal receiving end can receive the second signal including the spread spectrum signal.
  • the signal receiving end can obtain the first spreading sequence and the second spreading sequence, and can multiply the first spreading sequence and the second spreading sequence to obtain the third spreading sequence.
  • despread the received second signal by using the third spreading sequence to obtain a useful signal sent by the backscattering device, so as to achieve the purpose of eliminating the interference signal in the second signal.
  • the useful signal actually includes the chip signal x(t) to be sent in the radio frequency signal transmitting device, the local signal b(t) of the backscattering device, and the integrated channel signal h 3 (t) of the backscattering signal ).
  • a new sequence can be obtained, which is called a third spreading sequence.
  • the third spreading sequence and the first spreading sequence satisfy a certain constraint relationship, that is, the inner product is 0.
  • the starting and ending positions of the first spreading sequence in the first signal can be obtained first, and the superimposed signal is subjected to spreading processing at the same starting and ending positions. . That is, the signal can be spread-spectrum processed on the basis of chip synchronization.
  • a data signal (such as logic 1 or 0) is usually encoded by a plurality of encoded signals, and one of the encoded signals is called a chip.
  • the chip is equivalent to the carrier function in the analog modulation, and is the carrier of the digital signal.
  • the first spreading sequence and the second spreading sequence are respectively used to perform spread spectrum processing on the signal of the transmitting end and the reflected signal of the environmental scattering device, and based on the two spread spectrum sequences, the The third spreading sequence is used for despreading the signal received at the receiving end, which can effectively eliminate the interference signal and improve the reliability of the signal.
  • the first spreading sequence and the second spreading sequence belong to the same walsh-hadamard matrix.
  • the first spreading sequence and the second spreading sequence in the embodiment of the present application may be two columns selected from the same walsh-hadamard matrix, which are called walsh sequences.
  • the two selected walsh sequences can ensure that the result of multiplying each symbol in their sequences by twos produces another walsh sequence, which can be used as a third spreading sequence.
  • the walsh-hadamard is a non-sinusoidal orthogonal transformation method that decomposes the signal into a set of basis functions.
  • the columns of the walsh-hadamard matrix form an orthogonal sequence, and each column is called a walsh sequence.
  • the walsh sequence is a typical orthogonal code with good autocorrelation properties and zero cross-correlation properties everywhere.
  • the first spreading sequence and the second spreading sequence are selected from the same walsh-hadamard matrix, which can make good use of the orthogonal characteristic of the walsh-hadamard matrix, so that while effectively eliminating the interference signal at the receiving end, it can Effectively improve signal transmission efficiency and reliability.
  • none of the first spreading sequence, the second spreading sequence and the third spreading sequence are all 1 sequences.
  • the walsh-hadamard matrix in the embodiment of the present application is a complete walsh-hadamard matrix
  • the all-1 sequence needs to be removed from the walsh-hadamard matrix, and two walsh sequences are selected from the remaining sequences as the first spreading sequence respectively. and the second spreading sequence.
  • the third spreading sequence obtained by multiplying the first spreading sequence and the second spreading sequence cannot be an all-one sequence.
  • an all-1 sequence refers to a sequence in which each element in the sequence has a value of 1.
  • the operation process can be simplified and the accuracy of the operation result can be improved.
  • the execution body may be a signal sending device, or a control module in the signal sending device for executing the signal sending method.
  • a signal transmitting method performed by a signal transmitting apparatus is used as an example to describe the signal transmitting apparatus provided by the embodiments of the present application.
  • FIG. 3 is a schematic structural diagram of the signal sending apparatus provided in the embodiment of the present application. It includes: a receiving module 301 and a processing module 302 . in:
  • the receiving module 301 is used for receiving the first signal, and the first signal is obtained by spreading based on the first spreading sequence; the processing module 302 is used for superimposing the local signal on the first signal based on the second spreading sequence, and performing reverse operation Scatter send.
  • the product of the first spreading sequence and the second spreading sequence is the third spreading sequence, and the inner product of the third spreading sequence and the first spreading sequence is 0.
  • the first spreading sequence and the second spreading sequence belong to the same walsh-hadamard matrix.
  • none of the first spreading sequence, the second spreading sequence and the third spreading sequence are all 1 sequences.
  • the signal sending apparatus in this embodiment of the present application may be an apparatus, or may be a component, an integrated circuit, or a chip in an environmental backscattering device.
  • the device can be a mobile device or a non-mobile device.
  • the movable device may include, but is not limited to, the types of environmental backscattering devices 12 listed above, and the non-mobile device may be a server, a network attached storage (NAS), a personal computer (personal computer, PC). ), a television (television, TV), a teller machine or a self-service machine, etc., which are not specifically limited in the embodiments of the present application.
  • the signal sending device in the embodiment of the present application may be a device having an operating system.
  • the operating system may be an Android (Android) operating system, an ios operating system, or other possible operating systems, which are not specifically limited in the embodiments of the present application.
  • the signal sending apparatus provided in the embodiment of the present application can implement the processes implemented in FIG. 2 and the above-mentioned signal sending method embodiments, and achieve the same technical effect. To avoid repetition, details are not repeated here.
  • FIG. 4 is a schematic flowchart of a signal receiving method provided by an embodiment of the present application. The method can be applied to a terminal. As shown in FIG. 4 , the method includes:
  • Step 401 Send a first signal, where the first signal is obtained by spreading based on a first spreading sequence.
  • the execution subject of the embodiment of the present application may be a terminal.
  • the terminal before sending a radio frequency signal, the terminal first performs spread spectrum processing on the signal to be transmitted x(t) using a specific spread spectrum sequence to obtain a spread spectrum signal, is called the first signal, and the first signal is sent out.
  • the specific spreading sequence used is called the first spreading sequence
  • the to-be-sent signal x(t) is a chip signal encoded by the encoded signal.
  • spread spectrum refers to a communication technology that spreads the spectrum of the signal to be sent to a wider bandwidth than its original bandwidth.
  • the expansion of the frequency band is completed by an independent code sequence, using coding and modulation. method, wherein the code sequence is a spreading sequence.
  • the spread spectrum sequence is equivalent to the carrier of the signal to be sent in the coded modulation, and acts as a carrier.
  • Step 402 Receive a second signal, where the second signal is sent by the backscatter tag after receiving the first signal, superimposing the local signal on the first signal based on the second spread spectrum sequence, and performing backscatter transmission.
  • the first signal will diverge and transmit outward.
  • the first signal reaches the ambient reflection scattering device, it will be reflected by the ambient backscattering device to generate a backscattering signal.
  • the first signal will be reflected by the surrounding environment, such as walls, obstacles, etc., to form an environmental reflection signal, and the first signal itself will generate a self-interference signal.
  • the terminal after sending the first signal, the terminal will simultaneously receive the backscattered signal reflected by the environmental backscattering device, the environmental reflected signal reflected by the surrounding environment, and the self-interference signal generated by itself, which together constitute the second signal .
  • the environment reflected signal reflected from the surrounding environment and the self-interference signal of the first signal together constitute the interference signal of the terminal.
  • the backscattering device when the first signal is transmitted to the ambient directional scattering device, after receiving the first signal, the backscattering device superimposes the local signal on the first signal, and uses another spread spectrum sequence to further perform the superimposed signal on the superimposed signal. Spread spectrum processing to form a backscattered signal and send it out.
  • the other spreading sequence used by the backscattering device may be referred to as the second spreading sequence.
  • the signal receiving end can receive the second signal including the spread spectrum signal.
  • the environmental backscattering device can obtain the start and end positions of the first spread spectrum sequence in the first signal, and compare the superimposed
  • the signal is spread spectrum processed. That is, the signal can be spread-spectrum processed on the basis of chip synchronization.
  • a data signal (such as logic 1 or 0) is usually encoded by a plurality of encoded signals, and one of the encoded signals is called a chip.
  • the chip is equivalent to the carrier function in the analog modulation, and is the carrier of the digital signal.
  • Step 403 despread the second signal based on the third spreading sequence.
  • the product of the first spreading sequence and the second spreading sequence is the third spreading sequence, and the inner product of the third spreading sequence and the first spreading sequence is 0.
  • the terminal after acquiring the second signal, the terminal also needs to acquire the second spreading sequence used when the environmental backscattering device performs the spreading processing, and obtain the third spreading sequence accordingly. After that, despread the received second signal by using the third spreading sequence to obtain a useful signal sent by the backscattering device, so as to achieve the purpose of eliminating the interference signal in the second signal.
  • the useful signal actually includes the chip signal x(t) to be sent in the radio frequency signal transmitting device, the local signal b(t) of the backscattering device, and the integrated channel signal h 3 (t) of the backscattering signal ).
  • a new sequence can be obtained, which is called a third spreading sequence.
  • the third spreading sequence and the first spreading sequence satisfy a certain constraint relationship, that is, the inner product is 0.
  • the first spreading sequence and the second spreading sequence are respectively used to perform spread spectrum processing on the signal of the transmitting end and the reflected signal of the environmental scattering device, and based on the two spreading sequences, the The third spreading sequence is used for despreading the signal received at the receiving end, which can effectively eliminate the interference signal and improve the reliability of the signal.
  • the first spreading sequence and the second spreading sequence belong to the same walsh-hadamard matrix.
  • the first spreading sequence and the second spreading sequence in the embodiment of the present application may be two columns selected from the same walsh-hadamard matrix, which are called walsh sequences.
  • the two selected walsh sequences can ensure that the result of multiplying each symbol in their sequences by twos produces another walsh sequence, which can be used as a third spreading sequence.
  • the walsh-hadamard is a non-sinusoidal orthogonal transformation method that decomposes the signal into a set of basis functions.
  • the columns of the walsh-hadamard matrix form an orthogonal sequence, and each column is called a walsh sequence.
  • the walsh sequence is a typical orthogonal code with good autocorrelation properties and zero cross-correlation properties everywhere.
  • the first spreading sequence and the second spreading sequence are selected from the same walsh-hadamard matrix, which can make good use of the orthogonal characteristic of the walsh-hadamard matrix, so that while effectively eliminating the interference signal at the receiving end, it can Effectively improve signal transmission efficiency and reliability.
  • none of the first spreading sequence, the second spreading sequence and the third spreading sequence are all 1 sequences.
  • the walsh-hadamard matrix in the embodiment of the present application is a complete walsh-hadamard matrix
  • the all-1 sequence needs to be removed from the walsh-hadamard matrix, and two walsh sequences are selected from the remaining sequences as the first spreading sequence respectively. and the second spreading sequence.
  • the third spreading sequence obtained by multiplying the first spreading sequence and the second spreading sequence cannot be an all-one sequence.
  • an all-1 sequence refers to a sequence in which each element in the sequence has a value of 1.
  • the operation process can be simplified and the accuracy of the operation result can be improved.
  • the signal receiving method of the embodiment of the present application further includes: determining the second spreading sequence used by the backscattered tag; The first spreading sequence and each symbol in the second spreading sequence are multiplied two by two to obtain a third spreading sequence.
  • the terminal in this embodiment of the present application performs despreading processing on the received second signal, it first needs to obtain a spreading sequence used for despreading, that is, a second spreading sequence.
  • the second spread spectrum sequence may be allocated by the terminal to the environmental backscattering device in advance and stored in the local memory, or may be selected by the environmental backscattering device and fed back to the terminal, or may be carried in the handshake In the signal, this embodiment of the present application does not limit this.
  • the terminal obtains each element symbol in the sequence according to the obtained first spreading sequence and the second spreading sequence, and multiplies the corresponding element symbols in the two sequences by two to obtain a plurality of new element symbols , and use these new element symbols to form a third spreading sequence.
  • the execution body may be a signal receiving device, or a control module in the signal receiving device for executing the signal receiving method.
  • the signal receiving device provided by the embodiment of the present application is described by taking a signal receiving device performing a signal receiving method as an example.
  • FIG. 5 is a schematic structural diagram of the signal receiving apparatus provided in the embodiment of the present application. It includes: a sending module 501 , a receiving module 502 and a processing module 503 . in:
  • the sending module 501 is used for sending a first signal, and the first signal is obtained by spreading based on the first spreading sequence;
  • the receiving module 502 is used for receiving a second signal, and the second signal is that after the backscattering tag receives the first signal, The local signal is superimposed on the first signal based on the second spreading sequence, and backscattered and sent;
  • the processing module 503 is configured to despread the second signal based on the third spreading sequence.
  • the product of the first spreading sequence and the second spreading sequence is the third spreading sequence, and the inner product of the third spreading sequence and the first spreading sequence is 0.
  • the first spreading sequence and the second spreading sequence belong to the same walsh-hadamard matrix.
  • none of the first spreading sequence, the second spreading sequence and the third spreading sequence are all 1 sequences.
  • processing module is also used for: determining the second spreading sequence used by the backscattered tag; multiplying each symbol in the first spreading sequence and the second spreading sequence two by two to obtain a third spreading sequence .
  • the signal receiving apparatus in this embodiment of the present application may be a device, or may be a component, an integrated circuit, or a chip in a terminal.
  • the device may be a mobile terminal or a non-mobile terminal.
  • the mobile terminal may include, but is not limited to, the types of terminals 11 listed above, and the non-mobile terminal may be a server, a network attached storage (NAS), a personal computer (personal computer, PC), a television ( television, TV), teller machine, or self-service machine, etc., which are not specifically limited in the embodiments of the present application.
  • the signal receiving device in the embodiment of the present application may be a device having an operating system.
  • the operating system may be an Android (Android) operating system, an ios operating system, or other possible operating systems, which are not specifically limited in the embodiments of the present application.
  • the signal receiving apparatus provided in the embodiment of the present application can implement the processes implemented in FIG. 4 and the above-mentioned signal receiving method embodiments, and achieve the same technical effect. To avoid repetition, details are not repeated here.
  • h 1 (t) is the self-interference channel
  • h 2 (t) is the integrated channel of the signal reflected by the environment at the receiving end
  • h 3 (t) is the backscattering channel
  • b(t) is the backscattering device signal.
  • the signal to be transmitted is spread by using the first spreading sequence to obtain and transmit the first signal.
  • the transmitted signal generated according to the received signal is multiplied by the second spreading sequence at the chip level.
  • the sequence and the spreading sequence at the transmitting end of the terminal belong to the same walsh-hadamard matrix, and the spreading sequence is known by the transmitting end.
  • neither the spreading sequence nor the spreading sequence at the transmitting end is an all-one sequence.
  • the receiving end of the terminal can obtain or calculate the third spreading sequence to be used for despreading according to the first spreading sequence used by the transmitting end and the second spreading sequence used by the environmental backscattering label device.
  • the terminal receiving end uses the calculated third spreading sequence to despread the received signal, thereby recovering the received signal.
  • the tag device uses the second spreading sequence to superimpose on the received signal and reflect it, while ensuring transmission in the symbol level interval
  • the same data that is, the spread spectrum of the reflected signal cells; finally, the third spread spectrum sequence is used for despreading at the receiving signal end.
  • the interference signal received by the receiver at a discrete time k can be expressed as:
  • cm (k) is a set of spreading sequences of length L, such as walsh-hadamard sequences, m is any one of the total L sequences (except the all-1 sequence), assuming that the channel is maintained over the entire L chips constant.
  • the backscattering tag device After receiving the transmitted signal from the transmitter, the backscattering tag device transmits the local signal b(t) through backscattering, and superimposes another spread spectrum sequence c l (k) on the backscattered signal at the chip level .
  • the backscattered signal transmitted at the chip level is finally expressed as:
  • the received signal at the receiving end can be expressed as:
  • n white noise
  • the inner product of c j (k) and cm (k) is 0, so that the self-interference noise can be eliminated.
  • a plurality of walsh sequences that conform to the technical solution of the present application can be selected, and a part of the sequences can be used for a plurality of environmental backscattering label devices, and the terminal receiving end can select an appropriate sequence, Receive signals from backscattered tag devices in any environment while suppressing self-interference and interference from other tag devices.
  • the interference signal is one of the determinants that affects whether backscattering is feasible and restricts the reliability and efficiency of backscattering transmission, and has a more decisive influence on whether the system model of backscattering considered in this application is feasible.
  • the solution for eliminating self-interference by using a spread spectrum code provided in this application can ensure the feasibility of backscatter transmission and improve the transmission efficiency and reliability of backscatter transmission.
  • an embodiment of the present application further provides a communication device 600 , including a processor 601 , a memory 602 , and programs or instructions stored in the memory 602 and executable on the processor 601 .
  • a communication device 600 including a processor 601 , a memory 602 , and programs or instructions stored in the memory 602 and executable on the processor 601 .
  • the communication device 600 is a backscattering device, when the program or instruction is executed by the processor 601, each process of any of the above-mentioned signal sending method embodiments can be realized, and the same technical effect can be achieved.
  • the communication device 600 is a terminal, when the program or instruction is executed by the processor 601, each process of any of the above signal receiving method embodiments can be realized, and the same technical effect can be achieved. To avoid repetition, details are not described here.
  • FIG. 7 is a schematic diagram of a hardware structure of a communication device implementing an embodiment of the present application.
  • the communication device may be an ambient backscatter (ambient backscatter) device, such as a wearable device, and the wearable device may include a wristband, an earphone, and glasses.
  • the communication device 700 includes: a radio frequency device 701 and a baseband device 702 .
  • the radio frequency device 701 receives the information, and sends the received information to the baseband device 702 for processing.
  • the baseband device 702 processes the information to be sent and sends it to the radio frequency device 701
  • the radio frequency device 701 processes the received information and sends it out.
  • the structure of the environmental backscattering device shown in FIG. 7 does not constitute a limitation on the environmental backscattering device of the present application, and the environmental backscattering device of the present application may include more or less than the one shown in the figure. components, or a combination of certain components, or different component arrangements, which will not be repeated here.
  • the above signal sending apparatus may be located in the baseband apparatus 702 , and the method performed by the ambient backscattering device in the above embodiments may be implemented in the baseband apparatus 702 , where the baseband apparatus 702 includes a processor 703 and a memory 704 .
  • the baseband device 702 may include, for example, at least one baseband board on which multiple chips are arranged. As shown in FIG. 7 , one of the chips is, for example, the processor 703 , which is connected to the memory 704 to call the program in the memory 704 to execute Operation of the ambient backscatter apparatus shown in the above method embodiments.
  • Memory 704 may be used to store software programs or instructions as well as various data.
  • the memory 704 may mainly include a storage program or instruction area and a storage data area, wherein the storage program or instruction area may store an operating system, an application program or instruction required for at least one function (such as a sound playback function, an image playback function, etc.) and the like.
  • the memory 704 may include a high-speed random access memory, and may also include a non-volatile memory, wherein the non-volatile memory may be a read-only memory (Read-Only Memory, ROM), a programmable read-only memory (Programmable ROM) , PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electrically erasable programmable read-only memory (Electrically EPROM, EEPROM) or flash memory.
  • ROM Read-Only Memory
  • PROM programmable read-only memory
  • PROM erasable programmable read-only memory
  • Erasable PROM Erasable PROM
  • EPROM electrically erasable programmable read-only memory
  • EEPROM electrically erasable programmable read-only memory
  • flash memory for example at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device.
  • the processor 703 may include one or more processing units; optionally, the processor 703 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, application programs or instructions, etc., Modem processors mainly deal with wireless communications, such as baseband processors. It can be understood that, the above-mentioned modulation and demodulation processor may not be integrated into the processor 703 .
  • a processor 703 configured to: receive a first signal, where the first signal is obtained by spreading based on the first spreading sequence; superimpose the local signal on the first signal based on the second spreading sequence, and perform backscatter transmission;
  • the product of the first spreading sequence and the second spreading sequence is the third spreading sequence, and the inner product of the third spreading sequence and the first spreading sequence is 0.
  • the radio frequency device 701 processes the first signal to the processor 703; in addition, sends the reflected signal.
  • the radio frequency device 701 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like.
  • the baseband device 702 may further include a network interface 705 for exchanging information with the radio frequency device 701, and the interface is, for example, a common public radio interface (CPRI for short).
  • CPRI common public radio interface
  • the first spreading sequence and the second spreading sequence are respectively used to perform spread spectrum processing on the signal of the transmitting end and the reflected signal of the environmental scattering device, and a third spreading sequence is obtained based on the two spreading sequences for The despreading of the received signal at the receiving end can effectively eliminate the interference signal and improve the signal reliability.
  • the environmental backscattering device of the embodiment of the present application further includes: an instruction or program stored in the memory 704 and executable on the processor 703, and the processor 703 invokes the instruction or program in the memory 704 to execute the instruction or program shown in FIG. 3 .
  • the method executed by each module achieves the same technical effect. To avoid repetition, it is not repeated here.
  • FIG. 8 is a schematic diagram of a hardware structure of a terminal implementing an embodiment of the present application.
  • the terminal 800 includes but is not limited to: a radio frequency unit 801, a network module 802, an audio output unit 803, an input unit 804, a sensor 805, a display unit 806, a user input unit 807, an interface unit 808, a memory 809, a processor 810 and other components .
  • the terminal 800 may also include a power supply (such as a battery) for supplying power to various components, and the power supply may be logically connected to the processor 810 through a power management system, so as to manage charging, discharging, and power consumption through the power management system management and other functions.
  • a power supply such as a battery
  • the terminal structure shown in FIG. 8 does not constitute a limitation on the terminal, and the terminal may include more or less components than shown, or combine some components, or arrange different components, which will not be repeated here.
  • the input unit 804 may include a graphics processor (Graphics Processing Unit, GPU) 8041 and a microphone 8042. Such as camera) to obtain still pictures or video image data for processing.
  • the display unit 806 may include a display panel 8061, which may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like.
  • the user input unit 807 includes a touch panel 8071 and other input devices 8072 .
  • the touch panel 8071 is also called a touch screen.
  • the touch panel 8071 may include two parts, a touch detection device and a touch controller.
  • Other input devices 8072 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 repeated here.
  • the radio frequency unit 801 is used for sending a first signal or receiving a second signal.
  • the first signal is obtained by spread spectrum processing based on the first spread spectrum sequence
  • the second signal is obtained by the backscatter tag superimposing the local signal on the first signal based on the second spread spectrum sequence after receiving the first signal, and Sent by backscatter.
  • the radio frequency unit 801 processes the reflected signal to the processor 810 after receiving the reflected signal; in addition, sends the first signal to the backscattering device.
  • the radio frequency unit 801 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like.
  • Memory 809 may be used to store software programs or instructions as well as various data.
  • the memory 809 may mainly include a storage program or instruction area and a storage data area, wherein the storage program or instruction area may store an operating system, an application program or instruction required for at least one function (such as a sound playback function, an image playback function, etc.) and the like.
  • the memory 809 may include a high-speed random access memory, and may also include a non-volatile memory, wherein the non-volatile memory may be a read-only memory (Read-Only Memory, ROM), a programmable read-only memory (Programmable ROM) , PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electrically erasable programmable read-only memory (Electrically EPROM, EEPROM) or flash memory.
  • ROM Read-Only Memory
  • PROM programmable read-only memory
  • PROM erasable programmable read-only memory
  • Erasable PROM Erasable PROM
  • EPROM electrically erasable programmable read-only memory
  • EEPROM electrically erasable programmable read-only memory
  • flash memory for example at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device.
  • Processor 810 may include one or more processing units.
  • the processor 810 may integrate an application processor and a modem processor, wherein the application processor mainly handles the operating system, user interface, and application programs or instructions, and the modem processor mainly handles wireless communications, such as baseband. processor. It can be understood that, the above-mentioned modulation and demodulation processor may not be integrated into the processor 810.
  • the processor 810 is configured to: send a first signal, where the first signal is obtained by spreading based on the first spreading sequence; receive a second signal, where the second signal is obtained by the backscatter tag based on the second signal after receiving the first signal
  • the spreading sequence superimposes the local signal on the first signal and performs backscatter transmission; based on the third spreading sequence, the second signal is despread; wherein the first spreading sequence and the second spreading sequence
  • the result of the product of is the third spreading sequence, and the inner product of the third spreading sequence and the first spreading sequence is 0.
  • the first spreading sequence and the second spreading sequence are respectively used to perform spread spectrum processing on the signal of the transmitting end and the reflected signal of the environmental scattering device, and a third spreading sequence is obtained based on the two spreading sequences for The despreading of the received signal at the receiving end can effectively eliminate the interference signal and improve the signal reliability.
  • the processor 810 is further configured to: determine the second spreading sequence used by the backscattered tag, and multiply each symbol in the first spreading sequence and the second spreading sequence two by two to obtain the first spreading sequence. Triple spreading sequence.
  • An embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or instruction is executed by a processor, any one of the foregoing signal sending method embodiments or signal receiving method is implemented. In order to avoid repetition, the details are not repeated here.
  • the processor is the processor in the environmental backscattering device or the terminal described in the foregoing embodiment.
  • the readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk or an optical disk, and the like.
  • An embodiment of the present application further provides a chip, where the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run a program or instruction of an environmental backscattering device or a terminal, Corresponding to each process of implementing any of the above-mentioned embodiments of the signal sending method or the signal receiving method, and can achieve the same technical effect, to avoid repetition, details are not described here.
  • the chip mentioned in the embodiments of the present application may also be referred to as a system-on-chip, a system-on-chip, a system-on-a-chip, or a system-on-a-chip, or the like.
  • the method of the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is better implementation.
  • the technical solution of the present application can be embodied in the form of a software product in essence or in a part that contributes to the prior art, and the computer software product is stored in a storage medium (such as ROM/RAM, magnetic disk, CD-ROM), including several instructions to make a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) execute the methods described in the various embodiments of this application.
  • a storage medium such as ROM/RAM, magnetic disk, CD-ROM

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Abstract

本申请公开了一种信号发送和信号接收方法、终端及通信设备，其中信号发送方法包括：接收第一信号，所述第一信号为基于第一扩频序列扩频获得；基于第二扩频序列，将本地信号叠加在所述第一信号上，并进行反向散射发送；其中，所述第一扩频序列和所述第二扩频序列的乘积结果为第三扩频序列，且所述第三扩频序列与所述第一扩频序列的内积为0。

Description

信号发送和信号接收方法、终端及通信设备
相关申请的交叉引用
本申请主张在2020年10月14日在中国提交的中国专利申请号202011098298.6的优先权，其全部内容通过引用包含于此。
技术领域
本申请属于通信技术领域，具体涉及一种信号发送和信号接收方法、终端及通信设备。
背景技术
在未来B5G和6G通信系统中，如何提高能量的利用效率，实现绿色通信/环境友好的通信是重要的研究课题。反向散射(Backscatter)技术作为一种无源或者低耗能技术，其技术特点在于可以通过直接反射周围环境信号来传递自身信息。
环境反向散射技术的优势在于：其利用周围射频信号，不需要特定的频谱资源；射频信号的发送和反向散射信号的接收一般不是同一个设备；反向散射设备可以对周围信号的收集实现自身的能量储存来进一步支持自身的通信。由于环境反向散射技术以上技术特性，因此它是实现6G绿色通信，降低通信系统能量损耗，促进节能环保的关键技术之一。
在实现本申请过程中，发明人发现在应用现有的环境反向散射技术时，接收端将受到干扰信号的干扰。但是，由于环境反向散射技术中反向散射设备通常为无源器件或者能量受限器件，设备标签不向接收端发送导频/训练信号，接收端无法按照现有方法利用导频/训练信号消除干扰。因此，如何进行干扰消除，提高环境反向散射通信的成功率是亟需解决的问题。
发明内容
本申请实施例提供一种信号发送和信号接收方法、终端及通信设备，能够解决现 有环境反向散射技术中存在干扰信号干扰的问题。
第一方面，提供了一种信号发送方法，应用于通信设备，包括：
接收第一信号，所述第一信号为基于第一扩频序列扩频获得；
基于第二扩频序列，将本地信号叠加在所述第一信号上，并进行反向散射发送；
其中，所述第一扩频序列和所述第二扩频序列的乘积结果为第三扩频序列，且所述第三扩频序列与所述第一扩频序列的内积为0。
第二方面，提供了一种信号发送装置，包括：
接收模块，用于接收第一信号，所述第一信号为基于第一扩频序列扩频获得；
处理模块，用于基于第二扩频序列，将本地信号叠加在所述第一信号上，并进行反向散射发送；
其中，所述第一扩频序列和所述第二扩频序列的乘积结果为第三扩频序列，且所述第三扩频序列与所述第一扩频序列的内积为0。
第三方面，提供了一种信号接收方法，应用于终端，包括：
发送第一信号，所述第一信号为基于第一扩频序列扩频获得；
接收第二信号，所述第二信号是反向散射标签在接收到所述第一信号后，基于第二扩频序列将本地信号叠加在所述第一信号上，并进行反向散射发送的；
基于第三扩频序列，对所述第二信号进行解扩频；
其中，所述第一扩频序列和所述第二扩频序列的乘积结果为第三扩频序列，且所述第三扩频序列与所述第一扩频序列的内积为0。
第四方面，提供了一种信号接收装置，包括：
发送模块，用于发送第一信号，所述第一信号为基于第一扩频序列扩频获得；
接收模块，用于接收第二信号，所述第二信号是反向散射标签在接收到所述第一信号后，基于第二扩频序列将本地信号叠加在所述第一信号上，并进行反向散射发送的；
处理模块，用于基于第三扩频序列，对所述第二信号进行解扩频；
其中，所述第一扩频序列和所述第二扩频序列的乘积结果为第三扩频序列，且所述第三扩频序列与所述第一扩频序列的内积为0。
第五方面，提供了一种通信设备，包括处理器、存储器及存储在所述存储器上并可在所述处理器上运行的程序或指令，所述程序或指令被所述处理器执行时，实现如上述第一方面所述的信号发送方法的步骤。
第六方面，提供了一种终端，包括处理器、存储器及存储在所述存储器上并可在所述处理器上运行的程序或指令，所述程序或指令被所述处理器执行时，实现如上述第三方面所述的信号接收方法的步骤。
第七方面，提供了一种可读存储介质，所述可读存储介质上存储程序或指令，所述程序或指令被处理器执行时，实现如上述第一方面所述的信号发送方法，或者实现如上述第三方面所述的信号接收方法的步骤。
第八方面，提供了一种芯片，所述芯片包括处理器和通信接口，所述通信接口和所述处理器耦合，所述处理器用于运行环境反向散射设备或者终端的程序或指令，对应实现如上述第一方面所述的信号发送方法，或者实现如上述第三方面所述的信号接收方法的步骤。
在本申请实施例中，通过分别采用第一扩频序列和第二扩频序列对应对发送端信号和环境散射设备的反射信号进行扩频处理，并基于这两个扩频序列得到第三扩频序列用于接收端接收信号的解扩频，可以有效消除干扰信号，提高信号可靠性。
附图说明
图1为本申请实施例环境反向散射通信系统的框图；
图2为本申请实施例提供的信号发送方法的流程示意图；
图3为本申请实施例提供的信号发送装置的结构示意图；
图4为本申请实施例提供的信号接收方法的流程示意图；
图5为本申请实施例提供的信号接收装置的结构示意图；
图6为本申请实施例提供的通信设备的实体结构示意图；
图7为实现本申请实施例的通信设备的硬件结构示意图；
图8为实现本申请实施例的终端的硬件结构示意图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
本申请的说明书和权利要求书中的术语“第一”、“第二”等是用于区别类似的对象，而不用于描述特定的顺序或先后次序。应该理解这样使用的术语在适当情况下可以互换，以便本申请的实施例能够以除了在这里图示或描述的那些以外的顺序实施，且“第一”、“第二”所区别的对象通常为一类，并不限定对象的个数，例如第一对象可以是一个，也可以是多个。
值得指出的是，本申请实施例所描述的技术不限于长期演进型(Long Term Evolution，LTE)/LTE的演进(LTE-Advanced，LTE-A)系统或新空口(New Radio，NR)系统，还可用于其他无线通信系统，诸如码分多址(Code Division Multiple Access，CDMA)、时分多址(Time Division Multiple Access，TDMA)、频分多址(Frequency Division Multiple Access，FDMA)、正交频分多址(Orthogonal Frequency Division Multiple Access，OFDMA)、单载波频分多址(Single-carrier Frequency-Division Multiple Access，SC-FDMA)和其他系统。本申请实施例中所描述的技术既可用于以上提及的系统和无线电技术，也可用于其他系统和无线电技术。然而，以下描述出于示例目的描述了新空口(New Radio，NR)系统，并且在以下大部分描述中使用NR术语，这些技术也可应用于NR系统应用以外的应用，如第6代(6th Generation，6G)通信系统。
图1示出了本申请实施例可应用的一种环境反向散射通信系统的框图。环境反向散射通信系统包括终端11和环境反向散射设备12。其中，终端11也可以称作终端设备、接收端或者用户终端(User Equipment，UE)，终端11可以是手机、平板电脑(Tablet Personal Computer)、膝上型电脑(Laptop Computer)或称为笔记本电脑、个人数字助理(Personal Digital Assistant，PDA)、掌上电脑、上网本、超级移动个人计算机(ultra-mobile personal computer，UMPC)、移动上网装置(Mobile Internet Device，MID)或车载设备(VUE)、行人终端(PUE)等终端侧设备。环境反向散射设备12是具有反向散射功能的智能设备，能够对环境射频信号进行反向散射，如可以是可穿戴式设备(Wearable Device)，可穿戴 式设备可包括：手环、耳机、眼镜等。需要说明的是，在本申请实施例中并不限定终端11和环境反向散射设备12的具体类型。
在本申请实施例可以应用的系统中，环境射频信号的发送和反向散射信号的接收为同一设备终端11，也即外部的环境射频信号直接由反向散射信号接收设备终端11的发送端发出的信号充当。也就是说，终端11同时包含信号发送端和信号接收端：信号发送端发出射频信号，可作为环境射频信号；信号接收端接收环境反向散射设备12反射回来的反向散射信号。
具有反向散射功能的环境反向散射设备12在接收到发送端的信号后，根据自身定义的反射规则，对接收的环境射频信号进行反射发送，发出反向散射信号，传递自身信息。环境反向散射设备12发出的反向散射信号由终端11接收，终端11在接收有用反射信号的同时，会受到自身发送信号在接收端产生的自干扰的影响，同时也受到发射信号被周围环境反射后到达接收端的干扰信号的影响。
下面结合附图，通过具体的实施例及其应用场景对本申请实施例提供的信号发送方法、信号接收方法、装置、设备及终端进行详细地说明。
图2为本申请实施例提供的信号发送方法的流程示意图，该方法可应用于通信设备，该通信设备具体可以是环境反向散射(ambient backscatter)设备，如可以是可穿戴式设备，可穿戴式设备可包括：手环、耳机、眼镜等。如图2所示，该方法包括：
步骤201，接收第一信号，第一信号为基于第一扩频序列扩频获得。
具体而言，本申请实施例的执行主体可以为环境反向散射设备，其具有反向散射功能，可以接收来自环境的环境射频信号，该环境射频信号可称作第一信号。其中，第一信号是由环境反向散射设备周围环境中的射频信号发送设备(如图1中所示的终端11)发出的，且射频信号发送设备在发出第一信号前，需要先利用一特定扩频序列，对待发出的码片信号(如图1中的信号x(t))进行扩频处理得到第一信号。其中，该特定扩频序列可被称作第一扩频序列。
可以理解的是，反向散射是波、粒子或信号从它们来的方向反射回去，是由于散射而产生的漫反射。在环境反向散射技术中，反向散射设备通常为无源器件或者能量受限器件，其可以通过反射周边环境的射频信号进行通信，经反向散射设备反射发出的信号称作反向 散射信号。例如，反向散射设备标签通过反射或者不反射周围环境射频信号来表示0或1这两种状态，反向散射信号接收设备根据标签反射或者不反射时其接收信号的差异，来判断这两种状态，进而检测出标签发送的原始0或者1信息。
扩频是指将待发出信号的频谱打散到较其原始带宽更宽带宽上的一种通信技术，频带的扩展是通过一个独立的码序列来完成，用编码及调制的方法来实现的，其中该码序列即为扩频序列。扩频序列相当于编码调制中的待发出信号的载体，起到载波作用。
步骤202，基于第二扩频序列，将本地信号叠加在第一信号上，并进行反向散射发送。其中，第一扩频序列和第二扩频序列的乘积结果为第三扩频序列，且第三扩频序列与第一扩频序列的内积为0。
具体而言，在根据上述步骤接收到第一信号之后，反向散射设备将本地信号叠加到第一信号上，并利用另一扩频序列对叠加后的信号进行进一步扩频处理，形成反向散射信号发送出去。其中，反向散射设备用到的另一扩频序列可以称作第二扩频序列。
可以理解的是，在反向散射设备通过反向散射将反向散射信号发出之后，可由信号接收端接收包含该扩频信号的第二信号。并且，该信号接收端可以获取到第一扩频序列和第二扩频序列，并可将第一扩频序列和第二扩频序列进行相乘，得到第三扩频序列。之后，利用该第三扩频序列对接收到的第二信号进行解扩频，得到反向散射设备发出的有用信号，达到消除第二信号中的干扰信号的目的。结合图1，有用信号中实际包含了射频信号发送设备中待发出的码片信号x(t)、反向散射设备的本地信号b(t)以及反向散射信号的综合信道信号h 3(t)。
其中，本申请实施例的第一扩频序列和第二扩频序列对应元素相乘，可得到一个新的序列，称作第三扩频序列。并且，第三扩频序列和第一扩频序列满足一定的约束关系，即内积为0。
其中，在利用第二扩频序列进行扩频处理时，可以先获知第一信号中第一扩频序列开始和结束的位置，并在相同的开始和结束位置对叠加后的信号进行扩频处理。也即，可以在码片同步的基础上对信号进行扩频处理。可以知道，一个数据信号(如逻辑1或0)通常要用多个编码信号来进行编码，那么其中的一个编码信号就称为一个码片。码片相当于模拟调制中的载波作用，是数字信号的载体。
本申请实施例提供的信号发送方法，通过分别采用第一扩频序列和第二扩频序列对应对发送端信号和环境散射设备的反射信号进行扩频处理，并基于这两个扩频序列得到第三扩频序列用于接收端接收信号的解扩频，可以有效消除干扰信号，提高信号可靠性。
可选地，第一扩频序列和第二扩频序列属于同一个walsh-hadamard矩阵。
具体而言，本申请实施例中的第一扩频序列和第二扩频序列可以是从同一个walsh-hadamard矩阵中分别挑选出的两列，称为walsh序列。其中，挑选出的两个walsh序列能保证他们序列中的每个符号两两相乘的结果产生另外一个walsh序列，可作为第三扩频序列。
可以理解的是，walsh-hadamard是一种将信号分解成一组基函数的非正弦类正交变换方法，walsh-hadamard矩阵各列之间构成正交序列，其每一列称为一个walsh序列。walsh序列是一种典型的正交码，具有良好的自相关特性和处处为零的互相关特性。
本申请实施例将第一扩频序列和第二扩频序列选自同一walsh-hadamard矩阵，能够很好的利用walsh-hadamard矩阵的正交特性，从而在有效消除接收端干扰信号的同时，能够有效提高信号传输效率和可靠性。
可选地，第一扩频序列、第二扩频序列和第三扩频序列均不为全1序列。
具体而言，考虑到本申请实施例的walsh-hadamard矩阵如果是一个完整的walsh-hadamard矩阵，其中必然有唯一一个全1序列。而如果只使用部分walsh-hadamard矩阵，则其中可能不包括全1序列。因此，对于完整的walsh-hadamard矩阵或者存在全1序列的部分walsh-hadamard矩阵，由于全1序列与任何序列相乘仍为原序列，原序列与自身的内积通常不为0，无法实现干扰的有效消除，因此本申请实施例在根据上述实施例进行walsh序列的选取时，需从walsh-hadamard矩阵中去除全1序列，并在其余序列中选取两个walsh序列分别作为第一扩频序列和第二扩频序列。同时，为了有效利用walsh-hadamard矩阵的正交特性进行干扰消除，要求第一扩频序列和第二扩频序列相乘得到的第三扩频序列也不能为全1序列。对于walsh-hadamard矩阵中不存在全1序列的情形，则可不作本申请实施例的上述限制。可以理解的是，全1序列是指序列中的每个元素值均为1的序列。
本申请实施例通过将第一扩频序列、第二扩频序列和第三扩频序列限定为不为全1序 列，能够简化运算过程，提高运算结果准确性。
需要说明的是，本申请实施例提供的信号发送方法，执行主体可以为信号发送装置，或者，该信号发送装置中的用于执行信号发送方法的控制模块。本申请实施例中以信号发送装置执行信号发送方法为例，说明本申请实施例提供的信号发送装置。
本申请实施例的信号发送装置的结构如图3所示，为本申请实施例提供的信号发送装置的结构示意图，该装置可以用于实现上述各信号发送方法实施例中信号的发送，该装置包括：接收模块301和处理模块302。其中：
接收模块301用于接收第一信号，第一信号为基于第一扩频序列扩频获得；处理模块302用于基于第二扩频序列，将本地信号叠加在第一信号上，并进行反向散射发送。其中，第一扩频序列和第二扩频序列的乘积结果为第三扩频序列，且第三扩频序列与第一扩频序列的内积为0。
可选地，第一扩频序列和第二扩频序列属于同一个walsh-hadamard矩阵。
可选地，第一扩频序列、第二扩频序列和第三扩频序列均不为全1序列。
本申请实施例中的信号发送装置可以是装置，也可以是环境反向散射设备中的部件、集成电路、或芯片。该装置可以是可移动装置，也可以为非移动装置。示例性的，可移动装置可以包括但不限于上述所列举的环境反向散射设备12的类型，非移动装置可以为服务器、网络附属存储器(Network Attached Storage，NAS)、个人计算机(personal computer，PC)、电视机(television，TV)、柜员机或者自助机等，本申请实施例不作具体限定。
本申请实施例中的信号发送装置可以为具有操作系统的装置。该操作系统可以为安卓(Android)操作系统，可以为ios操作系统，还可以为其他可能的操作系统，本申请实施例不作具体限定。
本申请实施例提供的信号发送装置能够实现图2及上述各信号发送方法实施例实现的各个过程，并达到相同的技术效果，为避免重复，这里不再赘述。
图4为本申请实施例提供的信号接收方法的流程示意图，该方法可应用于终端，如图4所示，该方法包括：
步骤401，发送第一信号，该第一信号为基于第一扩频序列扩频获得。
具体而言，本申请实施例的执行主体可以为终端，结合图1，终端在发出射频信号前， 先对待发送信号x(t)利用一特定扩频序列进行扩频处理，得到扩频信号，称为第一信号，并将第一信号发出。其中，所使用的特定扩频序列称作第一扩频序列，待发出信号x(t)是经编码信号编码得到的码片信号。
可以理解的是，扩频是指将待发出信号的频谱打散到较其原始带宽更宽带宽上的一种通信技术，频带的扩展是通过一个独立的码序列来完成，用编码及调制的方法来实现的，其中该码序列即为扩频序列。扩频序列相当于编码调制中的待发出信号的载体，起到载波作用。
步骤402，接收第二信号，该第二信号是反向散射标签在接收到第一信号后，基于第二扩频序列将本地信号叠加在第一信号上，并进行反向散射发送的。
具体而言，在根据上述步骤将第一信号发出后，第一信号会向外发散传输。当第一信号到达环境反射散射设备时，会被环境反向散射设备反射，生成反向散射信号。同时，第一信号会被周围环境如墙壁、障碍物等反射，形成环境反射信号，且第一信号自身会产生自干扰信号。
因此，终端在发出第一信号后，同时会接收到环境反向散射设备反射回来的反向散射信号、周围环境反射回来的环境反射信号以及自身产生的自干扰信号，这些信号一起构成第二信号。其中，周围环境反射回来的环境反射信号和第一信号的自干扰信号一起构成终端的干扰信号。
其中，当第一信号传输到环境方向散射设备时，在接收到第一信号之后，反向散射设备将本地信号叠加到第一信号上，并利用另一扩频序列对叠加后的信号进行进一步扩频处理，形成反向散射信号发送出去。其中，反向散射设备用到的另一扩频序列可称作第二扩频序列。在反向散射设备通过反向散射将反向散射信号发出之后，可由信号接收端接收包含该扩频信号的第二信号。
其中，在利用第二扩频序列进行扩频处理时，环境反向散射设备能够获取到第一信号中第一扩频序列开始和结束的位置，并在相同的开始和结束位置对叠加后的信号进行扩频处理。也即，可以在码片同步的基础上对信号进行扩频处理。可以知道，一个数据信号(如逻辑1或0)通常要用多个编码信号来进行编码，那么其中的一个编码信号就称为一个码片。码片相当于模拟调制中的载波作用，是数字信号的载体。
步骤403，基于第三扩频序列，对第二信号进行解扩频。其中，第一扩频序列和第二扩频序列的乘积结果为第三扩频序列，且第三扩频序列与第一扩频序列的内积为0。
具体而言，终端在获取到第二信号后，还需要获取环境反向散射设备进行扩频处理时使用的第二扩频序列，并据此得到第三扩频序列。之后，利用该第三扩频序列对接收到的第二信号进行解扩频，得到反向散射设备发出的有用信号，达到消除第二信号中的干扰信号的目的。结合图1，有用信号中实际包含了射频信号发送设备中待发出的码片信号x(t)、反向散射设备的本地信号b(t)以及反向散射信号的综合信道信号h 3(t)。
其中，本申请实施例的第一扩频序列和第二扩频序列对应元素相乘，可得到一个新的序列，称作第三扩频序列。并且，第三扩频序列和第一扩频序列满足一定的约束关系，即内积为0。
本申请实施例提供的信号接收方法，通过分别采用第一扩频序列和第二扩频序列对应对发送端信号和环境散射设备的反射信号进行扩频处理，并基于这两个扩频序列得到第三扩频序列用于接收端接收信号的解扩频，可以有效消除干扰信号，提高信号可靠性。
可选地，第一扩频序列和第二扩频序列属于同一个walsh-hadamard矩阵。
具体而言，本申请实施例中的第一扩频序列和第二扩频序列可以是从同一个walsh-hadamard矩阵中分别挑选出的两列，称为walsh序列。其中，挑选出的两个walsh序列能保证他们序列中的每个符号两两相乘的结果产生另外一个walsh序列，可作为第三扩频序列。
可以理解的是，walsh-hadamard是一种将信号分解成一组基函数的非正弦类正交变换方法，walsh-hadamard矩阵各列之间构成正交序列，其每一列称为一个walsh序列。walsh序列是一种典型的正交码，具有良好的自相关特性和处处为零的互相关特性。
本申请实施例将第一扩频序列和第二扩频序列选自同一walsh-hadamard矩阵，能够很好的利用walsh-hadamard矩阵的正交特性，从而在有效消除接收端干扰信号的同时，能够有效提高信号传输效率和可靠性。
可选地，第一扩频序列、第二扩频序列和第三扩频序列均不为全1序列。
具体而言，考虑到本申请实施例的walsh-hadamard矩阵如果是一个完整的walsh-hadamard矩阵，其中必然有唯一一个全1序列。而如果只使用部分walsh-hadamard 矩阵，则其中可能不包括全1序列。因此，对于完整的walsh-hadamard矩阵或者存在全1序列的部分walsh-hadamard矩阵，由于全1序列与任何序列相乘仍为原序列，原序列与自身的内积通常不为0，无法实现干扰的有效消除，因此本申请实施例在根据上述实施例进行walsh序列的选取时，需从walsh-hadamard矩阵中去除全1序列，并在其余序列中选取两个walsh序列分别作为第一扩频序列和第二扩频序列。同时，为了有效利用walsh-hadamard矩阵的正交特性进行干扰消除，要求第一扩频序列和第二扩频序列相乘得到的第三扩频序列也不能为全1序列。对于walsh-hadamard矩阵中不存在全1序列的情形，则可不作本申请实施例的上述限制。可以理解的是，全1序列是指序列中的每个元素值均为1的序列。
本申请实施例通过将第一扩频序列、第二扩频序列和第三扩频序列限定为不为全1序列，能够简化运算过程，提高运算结果准确性。
进一步的，在基于第三扩频序列，对第二信号进行解扩频的步骤之前，本申请实施例的信号接收方法还包括：确定反向散射标签所使用的第二扩频序列；将第一扩频序列和第二扩频序列中每个符号两两相乘，获得第三扩频序列。
具体而言，本申请实施例的终端在对接收到的第二信号进行解扩频处理之前，先要获取到解扩频所使用的扩频序列，即第二扩频序列。具体的，该第二扩频序列可以是终端事先分配给环境反向散射设备并存储到本地存储器的，或者也可以是环境反向散射设备选取并反馈给终端的，或者也可以是携带在握手信号中的，本申请实施例对此并不作限制。
之后，终端根据得到的第一扩频序列和第二扩频序列，获取序列中的每个元素符号，并将两个序列中对应的元素符号分别两两相乘，得到多个新的元素符号，并利用这些新的元素符号，构成第三扩频序列。
需要说明的是，本申请实施例提供的信号接收方法，执行主体可以为信号接收装置，或者，该信号接收装置中的用于执行信号接收方法的控制模块。本申请实施例中以信号接收装置执行信号接收方法为例，说明本申请实施例提供的信号接收装置。
本申请实施例的信号接收装置的结构如图5所示，为本申请实施例提供的信号接收装置的结构示意图，该装置可以用于实现上述各信号接收方法实施例中信号的接收，该装置包括：发送模块501、接收模块502和处理模块503。其中：
发送模块501用于发送第一信号，第一信号为基于第一扩频序列扩频获得；接收模块502用于接收第二信号，第二信号是反向散射标签在接收到第一信号后，基于第二扩频序列将本地信号叠加在第一信号上，并进行反向散射发送的；处理模块503用于基于第三扩频序列，对第二信号进行解扩频。其中，第一扩频序列和第二扩频序列的乘积结果为第三扩频序列，且第三扩频序列与第一扩频序列的内积为0。
可选地，第一扩频序列和第二扩频序列属于同一个walsh-hadamard矩阵。
可选地，第一扩频序列、第二扩频序列和第三扩频序列均不为全1序列。
进一步的，处理模块还用于：确定反向散射标签所使用的第二扩频序列；将第一扩频序列和第二扩频序列中每个符号两两相乘，获得第三扩频序列。
本申请实施例中的信号接收装置可以是装置，也可以是终端中的部件、集成电路、或芯片。该装置可以是移动终端，也可以为非移动终端。示例性的，移动终端可以包括但不限于上述所列举的终端11的类型，非移动终端可以为服务器、网络附属存储器(Network Attached Storage，NAS)、个人计算机(personal computer，PC)、电视机(television，TV)、柜员机或者自助机等，本申请实施例不作具体限定。
本申请实施例中的信号接收装置可以为具有操作系统的装置。该操作系统可以为安卓(Android)操作系统，可以为ios操作系统，还可以为其他可能的操作系统，本申请实施例不作具体限定。
本申请实施例提供的信号接收装置能够实现图4及上述各信号接收方法实施例实现的各个过程，并达到相同的技术效果，为避免重复，这里不再赘述。
为进一步说明本申请实施例，以下结合图1的系统结构，进行更详细的说明，但不对本申请保护的范围进行限制。
结合图1，其中，x(t)为待发送信号，h 1(t)为自干扰信道，h 2(t)为环境反射的信号在接收端的综合信道，h 3(t)为反向散射信号的综合信道，b(t)为反向散射设备信号。
首先，在终端发送端对待发送信号利用第一扩频序列进行扩频，得到第一信号并发送。
其次，在与终端发送端和终端接收端码片级别同步的基础上，在环境反向散射标签设备上对根据接收信号产生的发送信号在码片级上乘以第二扩频序列，此扩频序列同终端发送端的扩频序列同属于一个walsh-hadamard矩阵，且此扩频序列为发送端已知。另外，此 扩频序列和发送端扩频序列均不为全1序列。
然后，终端接收端可以根据发送端使用的第一扩频序列和环境反向散射标签设备使用的第二扩频序列，来获得或计算出解扩频需要使用的第三扩频序列。
最后，终端接收端使用计算出的第三扩频序列对接收信号进行解扩频，从而恢复接收信号。
也就是说，先对发送端信号使用第一扩频序列进行扩频并发出；之后标签设备使用第二扩频序列叠加在接收的信号上并反射，同时保证在符号级别(symbol level)区间传送同样的数据，即对反射信号信元的扩频；最后，在接收信号端使用第三扩频序列进行解扩频。
在码片级别(chip level)上，接收端收到的干扰信号在某一离散时刻k可以表示为：
Figure PCTCN2021123300-appb-000001
其中，c m(k)为一组长度为L的扩频序列，例如walsh-hadamard序列，m为总共L个序列中的任意一个(全1序列除外)，假设信道在整个L个码片上保持不变。
反向散射标签设备在收到发送端的发送信号后，通过反向散射传递本地信号b(t)，并且在码片级别上对反向散射传递的信号叠加另一个扩频序列c l(k)。反向散射在码片级传输的信号最终表示为：
Figure PCTCN2021123300-appb-000002
则在接收端的接收信号可以表示为:
Figure PCTCN2021123300-appb-000003
其中，n为白噪声。
在接收端和反向散射设备标签同步且接收端已知反向散射设备标签所叠加的扩频序列c l(k)的情况下，c m(k和)c l(k)的相乘将产生另一个扩频序列：
c j(k)＝c m(k)c l(k)，k∈[1,L]。
最后，在接收端对收到的y(k)信号使用cj(k)进行解扩频处理得：
Figure PCTCN2021123300-appb-000004
根据walsh码的特性，c j(k)与c m(k)的内积为0，从而可以实现对自干扰噪声的消除。
可选地，利用本申请的方法，可以挑选出多个符合本申请技术方案的walsh序列，将其中的一部分序列用于多个环境反向散射标签设备，终端接收端可以通过选择合适的序列，接收任一环境反向散射标签设备的信号，同时抑制自干扰和其他标签设备的干扰。
干扰信号是影响反向散射是否可行并制约反向散射传输可靠性、效率的决定因素之一，对本申请所考虑的反向散射的系统模型是否可行更有着决定性的影响。本申请提供的使用扩频码消除自干扰的方案，能够保证反向散射传输的可行性，并提高反向散射传输的传输效率和可靠性。
如图6所示，本申请实施例还提供一种通信设备600，包括处理器601、存储器602以及存储在存储器602上并可在处理器601上运行的程序或指令。例如，该通信设备600为反向散射设备时，该程序或指令被处理器601执行时，实现上述任一信号发送方法实施例的各个过程，且能达到相同的技术效果。该通信设备600为终端时，该程序或指令被处理器601执行时，实现上述任一信号接收方法实施例的各个过程，且能达到相同的技术效果，为避免重复，这里不再赘述。
具体地，图7为实现本申请实施例的一种通信设备的硬件结构示意图。该通信设备具体可以是环境反向散射(ambient backscatter)设备，如可以是可穿戴式设备，可穿戴式设备可包括：手环、耳机、眼镜等。如图7所示，该通信设备700包括：射频装置701和基带装置702。在接收射频信号时，射频装置701接收信息，并将接收的信息发送给基带装置702进行处理。在反射信号时，基带装置702对要发送的信息进行处理，并发送给射频装置701，射频装置701对收到的信息进行处理后发送出去。
本领域技术人员可以理解，图7中示出的环境反向散射设备的结构并不构成对本申请环境反向散射设备的限定，本申请环境反向散射设备可以包括比图示更多或更少的部件，或者组合某些部件，或者不同的部件布置，在此不再赘述。
上述信号发送装置可以位于基带装置702中，以上实施例中环境反向散射设备执行的方法可以在基带装置702中实现，该基带装置702包括处理器703和存储器704。
基带装置702例如可以包括至少一个基带板，该基带板上设置有多个芯片，如图7所示，其中一个芯片例如为处理器703，与存储器704连接，以调用存储器704中的程序，执行以上方法实施例中所示的环境反向散射设备的操作。
存储器704可用于存储软件程序或指令以及各种数据。存储器704可主要包括存储程序或指令区和存储数据区，其中，存储程序或指令区可存储操作系统、至少一个功能所需的应用程序或指令(比如声音播放功能、图像播放功能等)等。此外，存储器704可以包括高速随机存取存储器，还可以包括非易失性存储器，其中，非易失性存储器可以是只读存储器(Read-Only Memory，ROM)、可编程只读存储器(Programmable ROM，PROM)、可擦除可编程只读存储器(Erasable PROM，EPROM)、电可擦除可编只读存储器(Electrically EPROM，EEPROM)或闪存。例如至少一个磁盘存储器件、闪存器件、或其他非易失性固态存储器件。
处理器703可包括一个或多个处理单元；可选的，处理器703可集成应用处理器和调制解调处理器，其中，应用处理器主要处理操作系统、用户界面和应用程序或指令等，调制解调处理器主要处理无线通信，如基带处理器。可以理解的是，上述调制解调处理器也可以不集成到处理器703中。
处理器703，用于：接收第一信号，第一信号为基于第一扩频序列扩频获得；基于第二扩频序列，将本地信号叠加在第一信号上，并进行反向散射发送；其中，第一扩频序列和第二扩频序列的乘积结果为第三扩频序列，且第三扩频序列与第一扩频序列的内积为0。
本申请实施例中，射频装置701将第一信号接收后，给处理器703处理；另外，将反射信号发出。通常，射频装置701包括但不限于天线、至少一个放大器、收发信机、耦合器、低噪声放大器、双工器等。
该基带装置702还可以包括网络接口705，用于与射频装置701交互信息，该接口例如为通用公共无线接口(common public radio interface，简称CPRI)。
本申请实施例通过分别采用第一扩频序列和第二扩频序列对应对发送端信号和环境散射设备的反射信号进行扩频处理，并基于这两个扩频序列得到第三扩频序列用于接收端接收信号的解扩频，可以有效消除干扰信号，提高信号可靠性。
具体的，本申请实施例的环境反向散射设备还包括：存储在存储器704上并可在处理器703上运行的指令或程序，处理器703调用存储器704中的指令或程序执行图3所示各模块执行的方法，并达到相同的技术效果，为避免重复，故不在此赘述。
具体地，图8为实现本申请实施例的一种终端的硬件结构示意图。该终端800包括但 不限于：射频单元801、网络模块802、音频输出单元803、输入单元804、传感器805、显示单元806、用户输入单元807、接口单元808、存储器809、以及处理器810等部件。
本领域技术人员可以理解，终端800还可以包括给各个部件供电的电源(比如电池)，电源可以通过电源管理系统与处理器810逻辑相连，从而通过电源管理系统实现管理充电、放电、以及功耗管理等功能。图8中示出的终端结构并不构成对终端的限定，终端可以包括比图示更多或更少的部件，或者组合某些部件，或者不同的部件布置，在此不再赘述。
应理解的是，本申请实施例中，输入单元804可以包括图形处理器(Graphics Processing Unit，GPU)8041和麦克风8042，图形处理器8041对在视频捕获模式或图像捕获模式中由图像捕获装置(如摄像头)获得的静态图片或视频的图像数据进行处理。显示单元806可包括显示面板8061，可以采用液晶显示器、有机发光二极管等形式来配置显示面板8061。用户输入单元807包括触控面板8071以及其他输入设备8072。触控面板8071，也称为触摸屏。触控面板8071可包括触摸检测装置和触摸控制器两个部分。其他输入设备8072可以包括但不限于物理键盘、功能键(比如音量控制按键、开关按键等)、轨迹球、鼠标、操作杆，在此不再赘述。
其中，射频单元801，用于发送第一信号或者接收第二信号。其中，第一信号为基于第一扩频序列扩频处理获得，第二信号是反向散射标签在接收到第一信号后，基于第二扩频序列将本地信号叠加在第一信号上，并进行反向散射发送的。
本申请实施例中，射频单元801将反射信号接收后，给处理器810处理；另外，将第一信号发送给反向散射设备。通常，射频单元801包括但不限于天线、至少一个放大器、收发信机、耦合器、低噪声放大器、双工器等。
存储器809可用于存储软件程序或指令以及各种数据。存储器809可主要包括存储程序或指令区和存储数据区，其中，存储程序或指令区可存储操作系统、至少一个功能所需的应用程序或指令(比如声音播放功能、图像播放功能等)等。此外，存储器809可以包括高速随机存取存储器，还可以包括非易失性存储器，其中，非易失性存储器可以是只读存储器(Read-Only Memory，ROM)、可编程只读存储器(Programmable ROM，PROM)、可擦除可编程只读存储器(Erasable PROM，EPROM)、电可擦除可编程只读存储器(Electrically EPROM，EEPROM)或闪存。例如至少一个磁盘存储器件、闪存器件、或其 他非易失性固态存储器件。
处理器810可包括一个或多个处理单元。可选的，处理器810可集成应用处理器和调制解调处理器，其中，应用处理器主要处理操作系统、用户界面和应用程序或指令等，调制解调处理器主要处理无线通信，如基带处理器。可以理解的是，上述调制解调处理器也可以不集成到处理器810中。
处理器810，用于：发送第一信号，第一信号为基于第一扩频序列扩频获得；接收第二信号，第二信号是反向散射标签在接收到第一信号后，基于第二扩频序列将本地信号叠加在第一信号上，并进行反向散射发送的；基于第三扩频序列，对第二信号进行解扩频；其中，第一扩频序列和第二扩频序列的乘积结果为第三扩频序列，且第三扩频序列与第一扩频序列的内积为0。
本申请实施例通过分别采用第一扩频序列和第二扩频序列对应对发送端信号和环境散射设备的反射信号进行扩频处理，并基于这两个扩频序列得到第三扩频序列用于接收端接收信号的解扩频，可以有效消除干扰信号，提高信号可靠性。
可选地，处理器810，还用于：确定反向散射标签所使用的第二扩频序列，并将第一扩频序列和第二扩频序列中每个符号两两相乘，获得第三扩频序列。
本申请实施例还提供一种可读存储介质，所述可读存储介质上存储有程序或指令，该程序或指令被处理器执行时，实现上述任一信号发送方法实施例或者信号接收方法实施例的各个过程，且能达到相同的技术效果，为避免重复，这里不再赘述。
其中，所述处理器为上述实施例中所述的环境反向散射设备或者终端中的处理器。所述可读存储介质，包括计算机可读存储介质，如计算机只读存储器(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等。
本申请实施例另提供了一种芯片，所述芯片包括处理器和通信接口，所述通信接口和所述处理器耦合，所述处理器用于运行环境反向散射设备或者终端的程序或指令，对应实现上述任一信号发送方法或者信号接收方法实施例的各个过程，且能达到相同的技术效果，为避免重复，这里不再赘述。
应理解，本申请实施例提到的芯片还可以称为系统级芯片、系统芯片、芯片系统或片上系统芯片等。
需要说明的是，在本文中，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者装置不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者装置所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括该要素的过程、方法、物品或者装置中还存在另外的相同要素。此外，需要指出的是，本申请实施方式中的方法和装置的范围不限按示出或讨论的顺序来执行功能，还可包括根据所涉及的功能按基本同时的方式或按相反的顺序来执行功能，例如，可以按不同于所描述的次序来执行所描述的方法，并且还可以添加、省去、或组合各种步骤。另外，参照某些示例所描述的特征可在其他示例中被组合。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到上述实施例方法可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质(如ROM/RAM、磁碟、光盘)中，包括若干指令用以使得一台终端(可以是手机，计算机，服务器，空调器，或者网络设备等)执行本申请各个实施例所述的方法。
上面结合附图对本申请的实施例进行了描述，但是本申请并不局限于上述的具体实施方式，上述的具体实施方式仅仅是示意性的，而不是限制性的，本领域的普通技术人员在本申请的启示下，在不脱离本申请宗旨和权利要求所保护的范围情况下，还可做出很多形式，均属于本申请的保护之内。

Claims (21)

  1. 一种信号发送方法，包括：
    通信设备接收第一信号，所述第一信号为基于第一扩频序列扩频获得；
    所述通信设备基于第二扩频序列，将本地信号叠加在所述第一信号上，并进行反向散射发送；
    其中，所述第一扩频序列和所述第二扩频序列的乘积结果为第三扩频序列，且所述第三扩频序列与所述第一扩频序列的内积为0。
  2. 根据权利要求1所述的信号发送方法，其中，所述第一扩频序列和所述第二扩频序列属于同一个walsh-hadamard矩阵。
  3. 根据权利要求2所述的信号发送方法，其中，所述第一扩频序列、所述第二扩频序列和所述第三扩频序列均不为全1序列。
  4. 一种信号发送装置，包括：
    接收模块，用于接收第一信号，所述第一信号为基于第一扩频序列扩频获得；
    处理模块，用于基于第二扩频序列，将本地信号叠加在所述第一信号上，并进行反向散射发送；
    其中，所述第一扩频序列和所述第二扩频序列的乘积结果为第三扩频序列，且所述第三扩频序列与所述第一扩频序列的内积为0。
  5. 根据权利要求4所述的信号发送装置，其中，所述第一扩频序列和所述第二扩频序列属于同一个walsh-hadamard矩阵。
  6. 根据权利要求5所述的信号发送装置，其中，所述第一扩频序列、所述第二扩频序列和所述第三扩频序列均不为全1序列。
  7. 一种信号接收方法，包括：
    终端发送第一信号，所述第一信号为基于第一扩频序列扩频获得；
    所述终端接收第二信号，所述第二信号是反向散射标签在接收到所述第一信号后，基于第二扩频序列将本地信号叠加在所述第一信号上，并进行反向散射发送的；
    所述终端基于第三扩频序列，对所述第二信号进行解扩频；
    其中，所述第一扩频序列和所述第二扩频序列的乘积结果为第三扩频序列，且所 述第三扩频序列与所述第一扩频序列的内积为0。
  8. 根据权利要求7所述的信号接收方法，其中，所述第一扩频序列和所述第二扩频序列属于同一个walsh-hadamard矩阵。
  9. 根据权利要求8所述的信号接收方法，其中，所述第一扩频序列、所述第二扩频序列和所述第三扩频序列均不为全1序列。
  10. 根据权利要求7或8或9所述的信号接收方法，其中，在所述终端基于第三扩频序列，对所述第二信号进行解扩频的步骤之前，还包括：
    所述终端确定所述反向散射标签所使用的所述第二扩频序列；
    所述终端将所述第一扩频序列和所述第二扩频序列中每个符号两两相乘，获得所述第三扩频序列。
  11. 一种信号接收装置，包括：
    发送模块，用于发送第一信号，所述第一信号为基于第一扩频序列扩频获得；
    接收模块，用于接收第二信号，所述第二信号是反向散射标签在接收到所述第一信号后，基于第二扩频序列将本地信号叠加在所述第一信号上，并进行反向散射发送的；
    处理模块，用于基于第三扩频序列，对所述第二信号进行解扩频；
    其中，所述第一扩频序列和所述第二扩频序列的乘积结果为第三扩频序列，且所述第三扩频序列与所述第一扩频序列的内积为0。
  12. 根据权利要求11所述的信号接收装置，其中，所述第一扩频序列和所述第二扩频序列属于同一个walsh-hadamard矩阵。
  13. 根据权利要求12所述的信号接收装置，其中，所述第一扩频序列、所述第二扩频序列和所述第三扩频序列均不为全1序列。
  14. 根据权利要求11或12或13所述的信号接收装置，其中，所述处理模块还用于：
    确定所述反向散射标签所使用的所述第二扩频序列；
    将所述第一扩频序列和所述第二扩频序列中每个符号两两相乘，获得所述第三扩频序列。
  15. 一种通信设备，包括处理器、存储器及存储在所述存储器上并可在所述处理器上运行的程序或指令，所述程序或指令被所述处理器执行时，实现如权利要求1-3任一项所述的信号发送方法的步骤。
  16. 一种终端，包括处理器、存储器及存储在所述存储器上并可在所述处理器上运行的程序或指令，所述程序或指令被所述处理器执行时，实现如权利要求7-10任一项所述的信号接收方法的步骤。
  17. 一种可读存储介质，所述可读存储介质上存储程序或指令，所述程序或指令被处理器执行时实现如权利要求1-3任一项所述的信号发送方法，或者实现如权利要求7-10任一项所述的信号接收方法的步骤。
  18. 一种芯片，所述芯片包括处理器和通信接口，所述通信接口和所述处理器耦合，所述处理器用于运行程序或指令，实现如权利要求1-3任一项所述的信号发送方法，或者实现如权利要求7-10任一项所述的信号接收方法。
  19. 一种计算机程序产品，所述程序产品被至少一个处理器执行以实现如权利要求1-3任一项所述的信号发送方法，或者实现如权利要求7-10任一项所述的信号接收方法。
  20. 一种通信设备，包括所述通信设备被配置成用于执行如权利要求1-3任一项所述的信号发送方法。
  21. 一种终端，包括所述终端被配置成用于执行如权利要求7-10任一项所述的信号接收方法。
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024001978A1 (zh) * 2022-06-29 2024-01-04 维沃移动通信有限公司 信号处理方法及通信设备
CN117375662A (zh) * 2022-06-29 2024-01-09 维沃移动通信有限公司 信号处理方法及通信设备
WO2024140545A1 (zh) * 2022-12-30 2024-07-04 中兴通讯股份有限公司 反向散射通信方法、通信装置以及存储介质

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116963251A (zh) * 2022-04-20 2023-10-27 维沃移动通信有限公司 功率控制方法、装置、终端、网络侧设备及系统
EP4523335A4 (en) * 2022-05-11 2026-02-18 Qualcomm Inc POWER-UP TIME CONFIGURED FOR ENERGY HARVESTING DEVICE
CN117812717A (zh) * 2022-09-22 2024-04-02 维沃移动通信有限公司 信号传输方法、装置、通信设备及存储介质
CN119895823A (zh) * 2022-09-30 2025-04-25 Oppo广东移动通信有限公司 无线通信的方法和设备
CN119095159A (zh) * 2023-06-06 2024-12-06 维沃移动通信有限公司 信息发送方法、接收方法、装置、设备及可读存储介质

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109660277A (zh) * 2018-12-28 2019-04-19 北京理工大学 一种混合扩频信息生成装置及方法
WO2019219156A1 (en) * 2018-05-14 2019-11-21 Nokia Technologies Oy Non-coherent backscatter communications over ambient-based wireless source
CN110663020A (zh) * 2017-04-06 2020-01-07 华盛顿大学 使用反向散射装置的图像和/或视频发射
CN110809200A (zh) * 2019-11-12 2020-02-18 西北大学 一种无源backscatter长距离通信系统

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE60205128T2 (de) * 2001-10-19 2006-05-24 Matsushita Electric Industrial Co., Ltd., Kadoma Vorrichtung und verfahren zur spreizspektrumübertragung
WO2015123306A1 (en) * 2014-02-11 2015-08-20 University Of Washington Apparatuses, systems, and methods for communicating using mimo and spread spectrum coding in backscatter of ambient signals
US10873363B2 (en) * 2015-08-12 2020-12-22 University Of Washington Backscatter devices and network systems incorporating backscatter devices
CN106506426B (zh) * 2016-10-11 2019-03-29 电子科技大学 基于ofdm载波的反向散射通信调制方法
EP3529902B1 (en) * 2016-10-18 2021-06-09 University of Washington Backscatter systems, devices, and techniques utilizing css modulation and/or higher order harmonic cancellation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110663020A (zh) * 2017-04-06 2020-01-07 华盛顿大学 使用反向散射装置的图像和/或视频发射
WO2019219156A1 (en) * 2018-05-14 2019-11-21 Nokia Technologies Oy Non-coherent backscatter communications over ambient-based wireless source
CN109660277A (zh) * 2018-12-28 2019-04-19 北京理工大学 一种混合扩频信息生成装置及方法
CN110809200A (zh) * 2019-11-12 2020-02-18 西北大学 一种无源backscatter长距离通信系统

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DOCUMENT 5A/TEMP/125: "Intelligent transport systems (ITS) usage in ITU Member States", 3GPP DRAFT; RAN REPLY TO ITU WP 5A ON ITS_V2X EDITED SECTIONS, 5 March 2017 (2017-03-05), pages 1 - 12, XP051236503 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024001978A1 (zh) * 2022-06-29 2024-01-04 维沃移动通信有限公司 信号处理方法及通信设备
CN117353801A (zh) * 2022-06-29 2024-01-05 维沃移动通信有限公司 信号处理方法及通信设备
CN117375662A (zh) * 2022-06-29 2024-01-09 维沃移动通信有限公司 信号处理方法及通信设备
WO2024140545A1 (zh) * 2022-12-30 2024-07-04 中兴通讯股份有限公司 反向散射通信方法、通信装置以及存储介质

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