WO2024017114A1 - 反向散射通信方法、设备及可读存储介质 - Google Patents

反向散射通信方法、设备及可读存储介质 Download PDF

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Publication number
WO2024017114A1
WO2024017114A1 PCT/CN2023/106959 CN2023106959W WO2024017114A1 WO 2024017114 A1 WO2024017114 A1 WO 2024017114A1 CN 2023106959 W CN2023106959 W CN 2023106959W WO 2024017114 A1 WO2024017114 A1 WO 2024017114A1
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Prior art keywords
signal
time unit
communication device
length
modulation
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PCT/CN2023/106959
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English (en)
French (fr)
Inventor
黄伟
谭俊杰
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维沃移动通信有限公司
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Publication of WO2024017114A1 publication Critical patent/WO2024017114A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/22Scatter propagation systems, e.g. ionospheric, tropospheric or meteor scatter
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006Arrangements for removing intersymbol interference
    • H04L25/03012Arrangements for removing intersymbol interference operating in the time domain
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/0012Modulated-carrier systems arrangements for identifying the type of modulation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes

Definitions

  • This application belongs to the field of communication technology, and specifically relates to a backscatter communication method, equipment and readable storage medium.
  • the future 6th Generation (6G) communication network needs to support a massive Internet of Everything, in which the number of IoT devices will reach hundreds of billions, and its connection density will be 10-100 times higher than that of 5G, reaching 10-100 /m2 connection density.
  • the massive number of IoT devices poses new challenges in terms of cost and power consumption. Cellular networking, low cost, low power consumption or even zero power consumption are the main trends in the development of IoT devices in the future.
  • Adopting a dual-base split architecture is one of the most effective ways to improve backscatter communication coverage, and effectively avoids the problem of two-way signal attenuation in single-base backscatter communication. By properly placing the RF source and the backscatter communication receiver, or even deploying a RF source dedicated to RF power supply, the transmission coverage of backscatter communication can be effectively improved.
  • the received signal is a superposition of the useful backscatter signal and the direct link interference signal or self-interference signal of the same frequency, and the intensity of the self-interference signal and the direct link interference signal may be much greater than the reverse direction signal. Scattered signal strength, thus making interference cancellation technology in backscatter communications more difficult.
  • Embodiments of the present application provide a backscatter communication method, device and readable storage medium, which can solve the problem of difficulty in eliminating interference in the backscatter communication system.
  • a backscatter communication method including:
  • the first communication device determines the first signal based on the first information
  • the first communication device sends the first signal to the second communication device
  • the first signal includes a first part and a second part
  • the first part occupies the length of the first time unit
  • the second part occupies the length of the second time unit
  • the length of the first time unit is the sum of the length of the first time unit and the length of the second time unit.
  • the second time unit has the same length
  • the data in the first time unit is the same as the data in the second time unit.
  • a backscatter communication method including:
  • the second communication device receives the first signal sent by the first communication device
  • the second communication device determines a second signal based on the second information
  • the second communication device modulates the first signal according to the second signal to generate a third signal
  • the second communication device sends the third signal to a third communication device
  • the first signal includes a first part and a second part, the first part occupies the length of the first time unit, the second part occupies the length of the second time unit, and the length of the first time unit is the sum of the length of the first time unit and the length of the second time unit.
  • the length of the second time unit is the same, the data in the first time unit is the same as the data in the second time unit, and the second signal is the amplitude of the first signal performed by the second communication device.
  • a baseband signal used when differentially modulating the dimensional and/or phase dimensions.
  • a backscatter communication method including:
  • the third communication device receives the third signal sent by the second communication device
  • the third communication device determines the signal modulation type and signal modulation parameters of the second signal according to the third information
  • the third communication device demodulates the bit information modulated by the second signal from the third signal according to the signal modulation type and signal modulation parameter of the second signal;
  • the third signal is a signal generated by the second communication device modulating the first signal sent by the first communication device according to the second signal
  • the second signal is a signal generated by the second communication device modulating the first signal sent by the first communication device.
  • the baseband signal used when the first signal is differentially modulated in the amplitude dimension and/or the phase dimension, the first signal includes a first part and a second part, the first part occupies the length of the first time unit, and the second part Partially occupies the length of the second time unit, the length of the first time unit is the same as the length of the second time unit, and the data in the first time unit is the same as the data in the second time unit.
  • a backscatter communication method including one or more of the following:
  • the fourth communication device configures or instructs the first information to the first communication device
  • the fourth communication device configures or instructs the second information to the second communication device
  • the fourth communication device configures or instructs the third information to the third communication device
  • the first information is used for the first communication device to determine the first signal
  • the second information is used for the second communication device to determine the second signal
  • the third information is used for the third communication
  • the device determines the signal modulation type and signal modulation parameters of the second signal
  • the first signal includes a first part and a second part
  • the first part occupies the length of a first time unit
  • the second part occupies a second time
  • the length of the unit, the length of the first time unit and the length of the second time unit are the same
  • the data in the first time unit is the same as the data in the second time unit
  • the second signal is The baseband signal used by the second communication device when differentially modulating the first signal in amplitude dimension and/or phase dimension.
  • a backscatter communication device including:
  • a first determination module configured to determine the first signal according to the first information
  • a first sending module configured to send the first signal to the second communication device
  • the first signal includes a first part and a second part, and the first part occupies a long period of the first time unit. degree, the second part occupies the length of the second time unit, the length of the first time unit is the same as the length of the second time unit, and the data in the first time unit is the same as the length of the second time unit. The data in are the same.
  • a backscatter communication device including:
  • a first receiving module configured to receive the first signal sent by the first communication device
  • a second determination module configured to determine the second signal according to the second information
  • a modulation module configured to perform backscatter modulation on the first signal according to the second signal to generate a third signal
  • a second sending module configured to send the third signal to a third communication device
  • the first signal includes a first part and a second part, the first part occupies the length of the first time unit, the second part occupies the length of the second time unit, and the length of the first time unit is the sum of the length of the first time unit and the length of the second time unit.
  • the length of the second time unit is the same, the data in the first time unit is the same as the data in the second time unit, and the second signal is the backscatter communication device's processing of the first signal.
  • a backscatter communication device including:
  • a second receiving module configured to receive the third signal sent by the second communication device
  • a third determination module configured to determine the signal modulation type and signal modulation parameters of the second signal according to the third information
  • a demodulation module configured to demodulate bit information of the second signal from the third signal according to the signal modulation type and signal modulation parameters of the second signal;
  • the third signal is a signal generated by the second communication device modulating the first signal sent by the first communication device according to the second signal
  • the second signal is a signal generated by the second communication device modulating the first signal sent by the first communication device.
  • the baseband signal used when the first signal is differentially modulated in the amplitude dimension and/or the phase dimension, the first signal includes a first part and a second part, the first part occupies the length of the first time unit, and the second part Partially occupies the length of the second time unit, the length of the first time unit is the same as the length of the second time unit, and the data in the first time unit is the same as the data in the second time unit.
  • a backscatter communication device including:
  • Configuration module for one or more of the following:
  • the first information is used for the first communication device to determine the first signal
  • the second information is used for the second communication device to determine the second signal
  • the third information is used for the third communication
  • the device determines the signal modulation type and signal modulation parameters of the second signal
  • the first signal includes a first part and a second part
  • the first part occupies the length of a first time unit
  • the second part occupies a second time
  • the length of the unit, the length of the first time unit and the length of the second time unit are the same
  • the data in the first time unit is the same as the data in the second time unit
  • the second signal is The baseband signal used by the second communication device when differentially modulating the first signal in amplitude dimension and/or phase dimension.
  • a communication device in a ninth aspect, includes a processor and a memory.
  • the memory stores programs or instructions that can be run on the processor.
  • the program or instructions are executed by the processor, the following is implemented: The steps of the method described in the first aspect, or the steps of implementing the method described in the second aspect, or the steps of the method described in the third aspect, or the steps of the method described in the fourth aspect.
  • a communication device including a processor and a communication interface
  • the processor is used by the first communication device to determine the first signal according to the first information
  • the communication interface is used for the first communication device to send a first signal to a second device
  • the first signal includes a first part and a second part
  • the first part occupies the length of the first time unit
  • the second part occupies the length of the second time unit
  • the length of the first time unit is the sum of the length of the first time unit and the length of the second time unit.
  • the second time unit has the same length
  • the data in the first time unit is the same as the data in the second time unit.
  • the communication interface is used by the second communication device to receive the first signal sent by the first communication device;
  • the processor is configured for the second communication device to determine a second signal according to the second information
  • the processor is configured for the second communication device to modulate the first signal according to the second signal and generate a third signal
  • the communication interface is used by the second communication device to send the third signal to a third communication device
  • the first signal includes a first part and a second part, the first part occupies the length of the first time unit, the second part occupies the length of the second time unit, and the length of the first time unit is the sum of the length of the first time unit and the length of the second time unit.
  • the length of the second time unit is the same, the data in the first time unit is the same as the data in the second time unit, and the second signal is the amplitude of the first signal performed by the second communication device.
  • a baseband signal used when differentially modulating the dimensional and/or phase dimensions.
  • the communication interface is used by the third communication device to receive the third signal sent by the second communication device;
  • the processor is configured for the third communication device to determine the signal modulation type and signal modulation parameters of the second signal according to the third information
  • the processor is configured for the third communication device to demodulate the bit information of the second signal from the third signal according to the signal modulation type and signal modulation parameters of the second signal;
  • the third signal is a signal generated by the second communication device modulating the first signal sent by the first communication device according to the second signal
  • the second signal is a signal generated by the second communication device modulating the first signal sent by the first communication device.
  • the baseband signal used when the first signal is differentially modulated in the amplitude dimension and/or the phase dimension, the first signal includes a first part and a second part, the first part occupies the length of the first time unit, and the second part Partially occupies the length of the second time unit, the length of the first time unit is the same as the length of the second time unit, and the data in the first time unit is the same as the data in the second time unit.
  • the communication interface is used for:
  • the fourth communication device configures or instructs the first information to the first communication device
  • the fourth communication device configures or instructs the second information to the second communication device
  • the fourth communication device configures or instructs the third information to the third communication device
  • the first information is used for the first communication device to determine the first signal
  • the second information is used for the second communication device to determine the second signal
  • the third information is used for the third communication
  • the device determines the signal modulation type and signal modulation parameters of the second signal
  • the first signal includes a first part and a second part
  • the first part occupies the length of a first time unit
  • the second part occupies a second time
  • the length of the unit, the length of the first time unit and the length of the second time unit are the same
  • the data in the first time unit is the same as the data in the second time unit
  • the second signal is The baseband signal used by the second communication device when differentially modulating the first signal in amplitude dimension and/or phase dimension.
  • a backscatter communication system including: a first communication device, a second communication device, a third communication device and a fourth communication device, the first communication device being operable to perform the steps of the first aspect
  • the steps of the backscatter communication method, the second communication device can be used to perform the steps of the backscatter communication method as described in the second aspect, and the third communication device can be used to perform the steps of the backscatter communication method as described in the third aspect.
  • the fourth communication device may be configured to perform the steps of the backscatter communication method as described in the fourth aspect.
  • a readable storage medium In a twelfth aspect, a readable storage medium is provided. Programs or instructions are stored on the readable storage medium. When the programs or instructions are executed by a processor, the steps of the method described in the first aspect are implemented, or the steps of the method are implemented. The steps of the method described in the second aspect, or the steps of implementing the method described in the third aspect, or the steps of the method described in the fourth aspect.
  • a chip in a thirteenth aspect, 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.
  • the steps of the method can either implement the steps of the method described in the second aspect, or implement the steps of the method described in the third aspect, or implement the steps of the method described in the fourth 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 first signal sent by the first communication device includes a first part that occupies the length of the first time unit and a second part that occupies the length of the second time unit.
  • the data in the first time unit is different from the second time unit.
  • the data in the time units are the same, that is, the first signal has a repeating time domain structure.
  • the second communication device performs amplitude dimension and/or phase dimension differential modulation on the first signal according to the second signal to obtain a third signal
  • the third communication device modulates the signal modulation type and signal modulation parameter according to the second signal from the third signal.
  • the bit information of the second signal is demodulated from the signal.
  • the repetitive time domain structure of the first signal is used to eliminate link interference; on the other hand, differential modulation in the amplitude dimension and/or phase dimension is used to improve the modulation and demodulation performance of the signal, or differential modulation in the amplitude dimension and/or phase dimension is used. Modulation to improve the frequency band utilization of the system and increase the rate of the baseband signal, completing the link through differential modulation in the amplitude dimension and/or phase dimension. Interference cancellation and demodulation of modulated signals.
  • Figure 1a is a schematic structural diagram of a backscatter communication sending end in related technology
  • Figure 1b is a schematic structural diagram of a backscatter communication receiving end in related technology
  • Figure 2 is a schematic structural diagram of a modulation circuit at the transmitter end of backscatter communication in the related art
  • Figure 3 is a schematic structural diagram of a single-base backscatter communication system in the related art
  • Figure 4 is one of the structural schematic diagrams of a bistatic backscatter communication system in the related art
  • Figure 5 is the second structural schematic diagram of a bistatic backscatter communication system in the related art
  • Figure 6 is a schematic diagram of the BSC baseband signal of the source radio frequency signal used for interference cancellation
  • Figure 7 is one of the schematic flow diagrams of the backscatter communication method provided by the embodiment of the present application.
  • Figure 8a is one of the structural diagrams of the first signal provided by the embodiment of the present application.
  • Figure 8b is the second structural diagram of the first signal provided by the embodiment of the present application.
  • Figure 9 is the second schematic flowchart of the backscatter communication method provided by the embodiment of the present application.
  • Figure 10 is the third schematic flowchart of the backscatter communication method provided by the embodiment of the present application.
  • Figure 11 is the fourth schematic flowchart of the backscatter communication method provided by the embodiment of the present application.
  • Figure 12a is one of the structural schematic diagrams of the backscatter communication device provided by the embodiment of the present application.
  • Figure 12b is the second structural schematic diagram of the backscatter communication device provided by the embodiment of the present application.
  • Figure 12c is the third structural schematic diagram of the backscatter communication device provided by the embodiment of the present application.
  • Figure 12d is the fourth structural schematic diagram of the backscatter communication device provided by the embodiment of the present application.
  • Figure 13 is a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • 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.
  • the first object can be one or multiple.
  • “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.
  • LTE Long Term Evolution
  • LTE-Advanced, LTE-A Long Term Evolution
  • LTE-A Long Term Evolution
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single-carrier Frequency Division Multiple Access
  • NR New Radio
  • Backscatter communication means that backscatter communication equipment uses radio frequency signals from other devices or the environment to perform signal modulation to transmit its own information. It is a relatively typical passive IoT device.
  • Figure 1a shows the backscatter communication transmitter. Its basic building blocks and main functions include:
  • Antenna unit 101 used to receive radio frequency signals and control commands, and at the same time, used to send modulated backscatter signals.
  • Energy collection module or energy supply module 102 This module is used for backscatter communication equipment to collect radio frequency energy, or other energy collection, including but not limited to solar energy, kinetic energy, mechanical energy, thermal energy, etc.
  • battery power supply modules may also be included. The energy harvesting module or energy supply module supplies power to all other modules in the device.
  • Microcontroller 103 includes control of baseband signal processing, energy storage or data scheduling status, switch switching, system synchronization, etc.
  • Signal receiving module 104 used to receive control commands or data, etc.
  • Channel coding and modulation module 105 performs channel coding and signal modulation under the control of a microcontroller, and realizes modulation by selecting different load impedances under the control of a microcontroller through a selection switch;
  • Memory or sensing module 106 used to store ID information, location information or sensing data of the device.
  • the backscatter communication transmitter can also integrate a low-power amplifier module to improve the receiving sensitivity and transmit power of the transmitter.
  • FIG. 1b shows the backscatter communication receiving end.
  • the backscattering communication receiving end in the traditional Radio Frequency Identification (RFID) system is the reader. Its basic components and main functions include:
  • Antenna unit 111 used to receive modulated backscattered signals.
  • Backscattered signal detection module 112 used to detect the backscattered signal sent by the transmitter, including Amplitude Shift Keying (ASK) detection and Phase-Shift Keying (PSK) detection , Frequency-Shift Keying (FSK) detection or Quadrature Amplitude Modulation (QAM) detection, etc.
  • ASK Amplitude Shift Keying
  • PSK Phase-Shift Keying
  • FSK Frequency-Shift Keying
  • QAM Quadrature Amplitude Modulation
  • Demodulation and decoding module 113 demodulate and decode the detected signal to restore the original information stream.
  • the modulation circuit is shown in Figure 2.
  • the backscatter communication equipment controls the reflection coefficient ⁇ of the circuit by adjusting its internal impedance, thereby changing the amplitude, frequency, phase, etc. of the incident signal to achieve signal modulation.
  • the reflection coefficient of the signal It can be characterized as:
  • backscatter communication equipment can be tags in traditional radio frequency identification (Radio Frequency Identification, RFID), or passive/semi-passive Internet of Things (IoT). ). For convenience, they are collectively referred to as BSC equipment here.
  • RFID Radio Frequency Identification
  • IoT Internet of Things
  • MBCS Monostatic Backscatter Communication System
  • MBCS is shown.
  • the traditional RFID system is a typical MBCS.
  • the system includes a BSC transmitter (such as Tag) and a reader (Reader).
  • the reader (Reader) contains an RF radio frequency source and a BSC receiver.
  • the RF radio frequency source is used to generate radio frequency signals to power the BSC transmitter/Tag.
  • the BSC transmitter backscatters the modulated RF signal, and the BSC receiver in the Reader receives the backscattered signal and demodulates the signal. Since the RF source and BSC receiver are in the same device, such as the Reader here, it is called a single-base or single-station backscatter communication system.
  • the MBCS system because the RF radio frequency signal sent from the BSC transmitter will undergo the double far-near effect caused by the signal attenuation of the round-trip signal, the energy of the signal is attenuated greatly. Therefore, the MBCS system is generally used for short-distance backscatter communication. For example, traditional RFID applications.
  • the RF source & backscatter communication receiver In single-base backscatter communication, the RF source & backscatter communication receiver on the one hand emits RF carriers to provide energy and target carriers for the backscatter communication equipment, and on the other hand receives the reflections of the backscatter communication equipment.
  • This full-duplex operating mechanism causes carrier leakage at the front end of the receiver to scatter the transmitted useful signal.
  • the RF source & backscatter communication receiving end reader/writer
  • the receiving antenna will simultaneously receive the useful signal of the same frequency and the self-interference signal caused by the carrier leakage, and the signal strength of the self-interference signal is much greater than the received signal. Useful backscattered signal.
  • the reader transceiver channel can be isolated in the reader structure, such as using a dual-antenna structure with separate receiving and transmitting antennas; using a multi-port circulator; using a coupler wait.
  • carrier elimination technology or self-interference elimination technology can be further used to eliminate carrier leakage, thereby improving the sensitivity of the receiver.
  • BBCS Bistatic Backscatter Communication System
  • direct link interference are different from the MBCS system.
  • the RF radio frequency source, BSC transmitting equipment and BSC receiving equipment in the BBCS system are separated, as shown in Figure 4 Schematic diagram of the BBCS system. Therefore, BBCS avoids the problem of large round-trip signal attenuation. In addition, the performance of the BBCS communication system can be further improved by reasonably placing the RF source.
  • Ambient Backscatter Communication Systems is also a type of bistatic backscatter communication, but unlike the RF source in the BBCS system, which is a dedicated signal RF source, the RF source in the ABCS system can be Available environmental RF sources, such as TV towers, cellular base stations, Wireless Fidelity (Wireless Fidelity, WiFi) signal, Bluetooth signal, etc.
  • bistatic backscatter communication system Different from the self-interference signal that exists in monostatic backscatter communication, what exists in bistatic backscatter communication system is direct link interference or cross-link interference from the radio frequency source to the backscatter communication receiver. And because the direct link interference may be a modulated signal, and the backscatter communication receiving end generally does not know the modulation characteristics of the direct link signal, the challenge of direct link interference cancellation is even greater.
  • the following takes the elimination of direct link interference as an example to explain the related technologies of interference cancellation.
  • the radio frequency carrier signal sent by the radio frequency source is s(t)
  • the channel from the radio frequency source to the BSC transmitting equipment is h 1
  • the baseband signal used by the BSC transmitting equipment to modulate the radio frequency carrier signal s(t) is b(t)
  • the radio frequency The channels from the source to the BSC receiving device and from the BSC sending device to the BSC receiving device are h 3 and h 2 respectively.
  • the received signal of the BSC receiving device is:
  • h 2 (t)* ⁇ b(t)*h 1 (t)*s(t) is the backscatter signal
  • h 3 (t)*s(t) is the direct link or cross-link interference Signal
  • w(n) is Gaussian noise
  • * is time domain convolution
  • reflection coefficient
  • the simplest demodulation method at the receiver is to treat direct link interference as noise and use hard decisions to demodulate.
  • the demodulation performance of this algorithm will be greatly deteriorated due to the presence of interference terms.
  • the receiver can effectively eliminate strong direct link interference based on the time domain structure and frequency domain structure characteristics of the radio frequency carrier signal and combined with the backscattering baseband signal design.
  • the radio frequency carrier signal is an orthogonal frequency division multiplex (OFDM) signal waveform widely used in LTE and NR systems
  • OFDM orthogonal frequency division multiplex
  • CP cyclic prefix
  • the guard bands in the OFDM frequency domain can also be used to eliminate interference, and the equivalent frequency of the baseband signal is moved to different guard bands for signal modulation.
  • the same design idea can also be extended to unmodulated single sine wave RF signals, etc. Taking a single sine wave as a radio frequency carrier signal as an example, the following describes the main process of eliminating direct link interference in bistatic backscatter communications.
  • P s , T s , ⁇ s represent the power, period and initial phase of the radio frequency signal.
  • represents the reflection coefficient
  • b(t) represents the modulated baseband signal
  • the first term in the above equation is the direct link interference signal, and the second term is the useful backscattered signal. Affected by the attenuation of the two-way channel, the power of the direct link interference signal will be much greater than the backscattered signal, and since the same radio frequency signal is used, the two are still signals of the same frequency.
  • the radio frequency signal and the BSC baseband signal can be jointly designed.
  • Figure 6 shows the BSC baseband signal of the source radio frequency signal used for interference cancellation.
  • T b 2KT s ,K ⁇ N + ;
  • the reader/writer samples the received signal at a sampling rate of T b /N. Based on the signal structure of Miller code, the signal of the second half T b period of the received signal is subtracted from the signal of the first half T b period to obtain the differential signal:
  • an embodiment of the present application provides a backscatter communication method.
  • the execution subject of the method is a first communication device.
  • the first communication device can be a radio frequency source in the BSC system. Use To provide radio frequency carrier signals for the BSC transmitter;
  • This method includes:
  • Step 701 The first communication device determines the first signal according to the first information
  • Step 702 The first communication device sends the first signal to the second communication device;
  • the above-mentioned second communication device may specifically be the BSC transmitting end in the BSC system.
  • the first communication device sending the first signal to the second communication device is equivalent to the radio frequency source providing the radio frequency signal to the BSC transmitting end.
  • the first signal may also be called a radio frequency signal, a carrier signal or a radio frequency carrier signal.
  • the above-mentioned first signal includes a first part and a second part, the first part occupies the length of the first time unit, the second part occupies the length of the second time unit, the length of the first time unit and the length of the second time unit Same, the data in the first time unit is the same as the data in the second time unit.
  • the first signal sent by the first communication device includes a first part that occupies the length of the first time unit and a second part that occupies the length of the second time unit.
  • the data in the first time unit is different from the second time unit.
  • the data in the time units are the same, that is, the first signal has a repeating time domain structure. In this way, the repetitive time domain structure of the first signal is utilized to eliminate link interference.
  • first time unit and second time unit frames, subframes, time slots, sub-slots, symbols, symbol sets, etc. do not limit the specific types of time units.
  • the first information is used to indicate the signal type and signal parameters of the first signal
  • the signal type of the first signal includes any of the following:
  • a first signal type, the first signal of the first signal type includes a first part and a second part;
  • the first signal of the second signal type includes a first part, a second part and a third part, the third part is located between the first part and the second part, and the third part occupies the length of the third time unit;
  • the above-mentioned first signal type and the second signal type respectively correspond to the signal formats of two first signals.
  • the above-mentioned first signal type can be called centralized, and the above-mentioned first signal type can be called distributed;
  • Figure 8a shows the structure of the centralized first signal
  • Figure 8b shows the structure of the distributed first signal
  • the RF source sends a RF signal s(t) that satisfies:
  • s(t) includes two time slot blocks (slot1 and slot2) with the same polarity and data.
  • Each two time slot blocks are centralized and form a basic time slot block.
  • the data length in each time slot is N, the period length is T s and is random.
  • n the m-th slot in the radio frequency signal
  • x(n) random data of length n
  • the radio frequency source sends a carrier signal s(t) that satisfies:
  • S(t) includes two time slot blocks (slot1 and slot2) with the same polarity and data. Each two time slot blocks are distributed, with Q slots or other data units of duration T a in between:
  • the data in each time slot may be a non-random or random sequence generated according to preset rules.
  • the signal parameters of the first signal include any of the following:
  • the length of the first time unit that is, the signal parameters of the first signal include the above T s ;
  • the length of the second time unit that is, the signal parameters of the first signal include the above T s ;
  • the signal parameters of the first signal include any of the following:
  • the length of the first time unit, and the length of the third time unit; that is, the signal parameters of the first signal include the above-mentioned T s and Ta .
  • the length of the second time unit, and the length of the third time unit; that is, the signal parameters of the first signal include the above-mentioned T s and Ta (the lengths of the first time unit and the second time unit are both T s ).
  • the length of the first time unit, and the sum of the lengths of the first time unit and the third time unit; that is, the signal parameters of the first signal include the above-mentioned T s and T s + Ta .
  • the length of the first time unit, and the sum of the lengths of the second time unit and the third time unit; that is, the signal parameters of the first signal include the above-mentioned T s and T s + Ta .
  • the length of the second time unit, and the sum of the lengths of the first time unit and the third time unit; that is, the signal parameters of the first signal include the above-mentioned T s and T s + Ta .
  • the signal parameters of the first signal include the above-mentioned T s and T s + Ta .
  • the signal format of the first signal and the length of each time unit in the first signal can be clarified through the above-mentioned signal type of the first signal and the signal parameters of the first signal.
  • the above-mentioned first information includes: first indication information configured or indicated by a fourth communication device, and the fourth communication device is one of the first communication device, the second communication device, and the third communication device. Either item, or the fourth communication device is a third-party communication device;
  • the first indication information is used to indicate the signal type and signal parameters of the first signal.
  • the above-mentioned third communication device may specifically be a BSC receiving end in the BSC system.
  • a fourth communication device is used to configure or indicate the specific signal type and signal parameters of the first signal.
  • the fourth communication device may be a first communication device, a second communication device, a third communication device, or a third communication device. Any one of the three communication devices, that is, any one of the radio frequency source, the BSC transmitter and the BSC receiver in the BSC system configures or indicates the signal type and signal parameters of the specific first signal, or,
  • the fourth communication device may also be a third-party communication device, that is, by setting up a separate fourth communication device to uniformly configure the signal type and signal parameters of the first signal.
  • the method further includes:
  • the first communication device receives the first information
  • the first information is provided by the fourth communication device through Radio Resource Control (RRC) signaling, Media Access Control Element (MAC CE), and Downlink Control Information (DCI). , Sidelink Control Information, SCI) and at least one configuration or indication in the preamble sequence.
  • RRC Radio Resource Control
  • MAC CE Media Access Control Element
  • DCI Downlink Control Information
  • SCI Sidelink Control Information
  • the fourth communication device and the first communication device are not the same device (the third communication device or a third-party communication device)
  • the first information is transmitted through RRC signaling, MAC CE, DCI, SCI and at least one carry in the leader sequence.
  • the method further includes:
  • the first communication device sends the second indication information to the second communication device and the third communication device;
  • the first communication device sends the second instruction information to the second communication device;
  • the second indication information is used to indicate the signal type and signal parameters of the first signal, and/or the signal modulation type and signal modulation parameters of the second signal.
  • the above-mentioned second signal is a baseband signal used by the second communication device to differentially modulate the first signal in amplitude dimension and/or phase dimension;
  • the first communication device may indicate the signal type and signal parameters of the first signal to the second communication device and the third communication device, and/or the signal modulation type and signal modulation parameters of the second signal, That is, the radio frequency source indicates the signal type and signal parameters of the radio frequency signal to the BSC transmitting end and the BSC receiving end, or directly indicates to the BSC the modulation type and signal modulation parameters of the baseband signal used by the subsequent BSC transmitting end to modulate the radio frequency signal.
  • the sending end and the BSC receiving end indicates the signal type and signal parameters of the radio frequency signal to the BSC transmitting end and the BSC receiving end.
  • the case where the first communication device and the third communication device are different devices corresponds to the bistatic backscatter communication system, and the first communication device sends the signal type indicating the first signal to the second communication device and the third communication device. and second indication information of signal parameters, corresponding to the signal type and signal parameters of the radio frequency signal sent by the radio frequency source to the BSC transmitting end and the BSC receiving end, and/or the modulation type and signal modulation parameters of the baseband signal;
  • the case where the first communication device and the third communication device are the same device corresponds to a single-base backscatter communication system, and the first communication device sends a second indication indicating the signal type and signal parameters of the first signal to the second communication device.
  • the signal modulation type of the second signal includes any of the following:
  • a first modulation type which is a modulation type that performs amplitude differential modulation on the first signal
  • a second modulation type which is a modulation type that performs phase differential modulation on the first signal
  • a third modulation type which is a modulation type that performs amplitude and phase differential modulation on the first signal
  • the signal modulation parameters of the second signal include one or more of the following:
  • modulation order of the second signal such as 2nd order or 4th order.
  • the baseband signal used by the second communication device to differentially modulate the first signal in the amplitude dimension and/or phase dimension can be clarified, for example, specifically for the amplitude dimension and / Or modulate in the phase dimension, as well as the specific modulation order, etc.
  • Table 1 gives a specific implementation example, that is, using indicator bits to indicate the modulation method used by the second communication device:
  • the first communication device sends second indication information, including:
  • the first communication device sends the second indication information through at least one of RRC signaling, MAC CE, DCI, SCI and preamble sequence.
  • the second indication information is used to indicate the signal type and signal parameters of the first signal, and/or the signal modulation type and signal modulation parameters of the second signal.
  • an embodiment of the present application provides a backscatter communication method.
  • the execution subject of the method is a second communication device.
  • the second communication device may be the BSC transmitter in the BSC system. Used to perform backscatter modulation on the radio frequency carrier signal provided by the radio frequency source, and send the modulated backscatter signal to the BSC receiving end;
  • This method includes:
  • Step 901 The second communication device receives the first signal sent by the first communication device
  • Step 902 The second communication device determines the second signal according to the second information
  • Step 903 The second communication device modulates the first signal according to the second signal to generate a third signal
  • Step 904 The second communication device sends the third signal to the third communication device
  • the first signal includes a first part and a second part, the first part occupies the length of the first time unit, the second part occupies the length of the second time unit, the length of the first time unit and the length of the second time unit The length is the same, the data in the first time unit is the same as the data in the second time unit, and the second signal is a baseband signal used by the second communication device to differentially modulate the first signal in amplitude dimension and/or phase dimension.
  • the first signal sent by the first communication device includes a first part that occupies the length of the first time unit and a second part that occupies the length of the second time unit.
  • the length of the first time unit and the second time The length of the units is the same, and the data in the first time unit is the same as the data in the second time unit, that is, the first signal has a repeated time domain structure.
  • the second communication device performs amplitude dimension and/or phase dimension differential modulation on the first signal according to the second signal to obtain a third signal
  • the third communication device modulates the signal modulation type and signal modulation parameter according to the second signal from the third signal.
  • the bit information of the second signal is demodulated from the signal.
  • the repetitive time domain structure of the first signal is used to eliminate link interference; on the other hand, amplitude dimension and/or phase dimension differential modulation is used to improve the modulation and demodulation performance of the signal. Or use differential modulation in the amplitude dimension and/or phase dimension to improve the frequency band utilization of the system and increase the rate of the baseband signal, and complete link interference cancellation and modulation signal demodulation through differential modulation in the amplitude dimension and/or phase dimension.
  • the BSC transmitter receives the radio frequency carrier signal sent by the radio frequency source, estimates the channel delay and delay spread from the radio frequency source to the BSC transmitter, and uses this delay as the starting point to transmit the backscatter modulated signal after modulation of the BSC baseband signal.
  • the second communication device modulates the first signal according to the second signal, including:
  • the second signal passes the amplitude difference value of the first half symbol period and the second half symbol period. It carries bit information, and when the bit information is the first value, the amplitude value of the second signal is the first amplitude value; when the bit information is the second value, the amplitude value of the first half symbol period of the second signal is the second amplitude value, The amplitude value of the second half symbol period of the second signal is the third amplitude value, and the second amplitude value and the third amplitude value are mutually different amplitude values;
  • the case of B 1.
  • the second signal passes the phase difference value of the first half symbol period and the second half symbol period.
  • the phase value of the second signal is the first phase value;
  • the bit information is the second value, the phase value of the first half symbol period of the second signal is the second phase value,
  • the amplitude value of the second half symbol period of the second signal is the third phase value, and the second phase value and the third phase value are mutually different phase values;
  • the second signal passes through the amplitude of the first half symbol period and the second half symbol period.
  • the sum phase difference value carries bit information, and when the bit information is the first value, the amplitude value of the second signal is the first amplitude value, and the phase value of the second signal is the first phase value; when the bit information is the second value, the The amplitude value of the first half symbol period of the second signal is the second amplitude value, the phase value of the first half symbol period of the second signal is the second phase value, and the amplitude value of the second half symbol period of the second signal is the third amplitude value.
  • the phase value of the second half symbol period of the second signal is the third phase value
  • the second amplitude value and the third amplitude value are mutually different amplitude values
  • the second phase value and the third phase value are mutually different phase value
  • the second communication device performs amplitude and phase differential modulation on the first signal according to the second signal, and the modulation order is fourth order, the second signal passes through the amplitude of the first half symbol period and the second half symbol period.
  • the sum phase difference value carries bit information, and when the bit information is the first value, the amplitude value of the first half symbol period of the second signal is the first amplitude value, and the phase value of the first half symbol period of the second signal is the first phase value.
  • the amplitude value of the second half symbol period of the second signal is the second amplitude value
  • the phase value of the second half symbol period of the second signal is the second phase value
  • the bit information is the second value
  • the first half of the second signal The amplitude value of a symbol period is the third amplitude value
  • the phase value of the first half symbol period of the second signal is the third phase value
  • the amplitude value of the second half symbol period of the second signal is the fourth amplitude value
  • the second signal The phase value of the second half symbol period is the fourth phase value
  • the amplitude value of the first half symbol period of the second signal is the fifth amplitude value
  • the phase of the first half symbol period of the second signal is The value is the fifth phase value
  • the amplitude value of the second half symbol period of the second signal is the sixth amplitude value
  • the phase value of the second half symbol period of the second signal is the sixth phase value
  • the bit information is the fourth value.
  • the amplitude value of the first half symbol period of the second signal is the seventh amplitude value
  • the phase value of the first half symbol period of the second signal is the seventh phase value
  • the amplitude value of the second half symbol period of the second signal is the eighth Amplitude value
  • the phase value of the second half symbol period of the second signal is the eighth phase value
  • the fourth amplitude value and the third amplitude The difference between the values, the difference between the sixth amplitude value and the fifth amplitude value, the difference between the eighth amplitude value and the seventh amplitude value are mutually different amplitude values
  • the second The difference between the phase value and the first phase value, the difference between the fourth phase value and the third phase value, the difference between the sixth phase value and the fifth phase value, the The difference between the eighth phase value and the seventh phase value is a mutually different phase value.
  • the values of the bit information corresponding to the above-mentioned first value, second value, third value and fourth value are only examples.
  • the first value, second value, third value and fourth value can be One of the bits 00, 01, 10, and 11, and one item that is different from each other.
  • is the backscattering factor or backscattering coefficient
  • h 1 is the channel coefficient from the radio frequency source to the backscattering transmitting device.
  • the second communication device implements differential modulation of the first signal in the amplitude dimension and/or phase dimension.
  • the modulation method for differential amplitude-phase modulation is described as follows:
  • the second signal b(t) is a signal of the first modulation type and the modulation order is 2 and satisfies the following properties:
  • the BSC baseband signal is:
  • ⁇ , ⁇ , ⁇ represent the amplitude of the BSC baseband signal
  • ⁇ ⁇ ⁇ , ⁇ 1 , ⁇ 2 and ⁇ 3 represent the phase of the signal
  • the second signal b(t) is a signal of the second modulation type and the modulation order is 2 and satisfies the following properties:
  • ⁇ , ⁇ , ⁇ represent the amplitude of the second signal
  • ⁇ , ⁇ 1 , ⁇ 2 and ⁇ 3 represent the phase of the signal
  • the second signal b(t) is a signal of the third modulation type and the modulation order is 4 and satisfies the following properties:
  • ⁇ 1 , ⁇ 2 , ⁇ 3 , ⁇ 4 , ⁇ , ⁇ , ⁇ , ⁇ represent the amplitude of the second signal
  • ⁇ 1 , ⁇ 2 , ⁇ 3 , ⁇ 4 , ⁇ 5 , ⁇ 6 , ⁇ 7 , ⁇ 8 represent the phase of the signal
  • the second signal b(t) is a signal of the third modulation type and the modulation order is 4 and satisfies the following properties:
  • ⁇ 1 , ⁇ 2 , ⁇ 3 , ⁇ 4 , ⁇ , ⁇ , ⁇ , ⁇ represent the amplitude of the second signal
  • ⁇ 1 , ⁇ 2 , ⁇ 3 , ⁇ 4 , ⁇ 5 , ⁇ 6 , ⁇ 7 , ⁇ 8 represent the phase of the signal
  • the second signal b(t) is a signal of the first modulation type and a modulation order of 2, and satisfies the following properties:
  • ⁇ , ⁇ , ⁇ represent the amplitude of the second signal
  • ⁇ , ⁇ 1 , ⁇ 2 and ⁇ 3 represent the phase of the signal
  • ⁇ 1 ⁇ 2 The period of the second signal
  • T b 2T s .
  • the baseband signal can be expressed as:
  • the second signal b(t) is a signal of the second modulation type and a modulation order of 2, and satisfies the following properties:
  • ⁇ , ⁇ , ⁇ represent the amplitude of the second signal
  • ⁇ , ⁇ 1 , ⁇ 2 and ⁇ 3 represent the phase of the signal
  • ⁇ 1 ⁇ 2 The period of the second signal
  • T b 2T s .
  • Its baseband signal can be expressed as:
  • the second signal b(t) is a signal of the third modulation type and a modulation order of 2, and satisfies the following properties:
  • ⁇ , ⁇ , ⁇ represent the amplitude of the second signal
  • ⁇ , ⁇ 1 , ⁇ 2 and ⁇ 3 represent the phase of the signal
  • ⁇ 1 ⁇ 2 The period of the second signal
  • T b 2T s .
  • the second signal b(t) is a third modulation type signal with a modulation order of 4, and satisfies the following properties:
  • ⁇ 1 , ⁇ 2 , ⁇ 3 , ⁇ 4 , ⁇ , ⁇ , ⁇ , ⁇ ⁇ represent the amplitude of the second signal
  • ⁇ 1 , ⁇ 2 , ⁇ 3 , ⁇ 4 , ⁇ 5 , ⁇ 6 , ⁇ 7 , ⁇ 8 represent the phase of the signal
  • the second information includes: second indication information indicated by the first communication device;
  • the second information includes: third indication information configured or indicated by the fourth communication device, which is any one of the first communication device, the second communication device, the third communication device, or the fourth communication device.
  • the device is a third-party communication device;
  • the second indication information is used to indicate the signal type and signal parameters of the first signal, and/or the signal modulation type and signal modulation parameters of the second signal
  • the third indication information is used to indicate the signal type and signal parameters of the first signal. parameters, and/or, the signal modulation type and signal modulation parameters of the second signal.
  • the first communication device may indicate the signal type and signal parameters of the first signal to the second communication device, and/or the signal modulation type and signal modulation parameters of the second signal
  • the fourth communication device may indicate the signal type and signal parameters of the first signal to the second communication device.
  • the device configures or indicates to the second communication device the signal type and signal parameters of the first signal, and/or the signal modulation type and signal modulation parameters of the second signal. That is, the signal type and signal parameters of the first signal, and/or the signal modulation type and signal modulation parameters of the second signal, may be mutually indicated within the first communication device, the second communication device, and the third communication device. , or it can be uniformly configured or instructed by a third-party communication device.
  • the second information includes: second indication information indicated by the first communication device, or the second information includes: third indication information configured or indicated by the fourth communication device, and the fourth If the communication device is not a second communication device, before the second communication device determines the second signal based on the second information, the method further includes:
  • the second communication device receives the second information
  • the second information is indicated by at least one of RRC signaling, MAC CE, DCI, SCI and preamble sequence.
  • the method further includes:
  • the second communication device sends the fourth indication information to the third communication device through at least one of RRC signaling, MAC CE, DCI, SCI and preamble sequence;
  • the fourth indication information is used to indicate the signal modulation type and signal modulation parameters of the second signal.
  • the second communication device indicates the signal modulation type and signal modulation parameters of the second signal to
  • the third communication device enables the BSC transmitting end to provide the signal modulation type and signal modulation parameters of the baseband signal used by itself to the BSC receiving end so that the BSC receiving end can demodulate.
  • the signal type of the first signal includes any of the following:
  • the first signal of the first signal type includes a first part and a second part
  • the first signal of the second signal type includes a first part, a second part and a third part.
  • the third part is located between the first part and the second part.
  • the third part occupies the third time unit. length;
  • the signal parameters of the first signal include any of the following:
  • the signal parameters of the first signal include any of the following:
  • the signal modulation type of the second signal includes any of the following:
  • a first modulation type which is a modulation type that performs amplitude differential modulation on the first signal
  • a second modulation type which is a modulation type that performs phase differential modulation on the first signal
  • a third modulation type which is a modulation type that performs amplitude and phase differential modulation on the first signal
  • the signal modulation parameters of the second signal include one or more of the following:
  • an embodiment of the present application provides a backscatter communication method.
  • the execution subject of the method is a third communication device.
  • the third communication device may be the BSC receiving end in the BSC system. Used to receive the modulated signal sent by the BSC transmitter and demodulate it;
  • This method includes:
  • Step 1001 The third communication device receives the third signal sent by the second communication device
  • Step 1002 The third communication device determines the signal modulation type and signal modulation parameters of the second signal according to the third information
  • Step 1003 The third communication device demodulates the bit information modulated by the second signal from the third signal according to the signal modulation type and signal modulation parameters of the second signal;
  • the third signal is a backscattered signal generated by the second communication device modulating the first signal sent by the first communication device according to the second signal
  • the second signal is the amplitude dimension sum// Or the baseband signal used in phase dimension differential modulation
  • the first signal includes a first part and a second part, the first part occupies the length of the first time unit, the second part occupies the length of the second time unit, the first time unit The length of is the same as the length of the second time unit, and the data in the first time unit is the same as the data in the second time unit.
  • the first signal sent by the first communication device includes a first part that occupies the length of the first time unit and a second part that occupies the length of the second time unit.
  • the length of the first time unit is equal to the length of the first time unit.
  • the length of the second time unit is the same, and the data in the first time unit is the same as the data in the second time unit, that is, the first signal has a repeated time domain structure.
  • the second communication device performs amplitude dimension and/or phase dimension differential modulation on the first signal according to the second signal to obtain a third signal
  • the third communication device modulates the signal modulation type and signal modulation parameter according to the second signal from the third signal.
  • the bit information of the second signal is demodulated from the signal.
  • the repetitive time domain structure of the first signal is used to eliminate link interference;
  • differential modulation in the amplitude dimension and/or phase dimension is used to improve the modulation and demodulation performance of the signal, or differential modulation in the amplitude dimension and/or phase dimension is used.
  • Modulation is used to improve the frequency band utilization of the system and increase the rate of the baseband signal.
  • Link interference cancellation and modulation signal demodulation are completed through differential modulation in the amplitude dimension and/or phase dimension.
  • the third information includes: second indication information indicated by the first communication device;
  • the third information includes: fourth indication information indicated by the second communication device;
  • the third information includes: the fifth instruction information is configured or instructed by a fourth communication device, and the fourth communication device is any one of the first communication device, the second communication device, the third communication device, or the fourth communication device For third-party communication equipment;
  • the second indication information is used to indicate the signal modulation type and signal modulation parameters of the second signal
  • the fourth indication information is used to indicate the signal modulation type and signal modulation parameters of the second signal
  • the fifth indication information is used to indicate the second signal signal modulation type and signal modulation parameters.
  • the third information includes: second indication information indicated by the first communication device, or the third information includes: fourth indication information indicated by the second communication device, or the third information includes : The fifth indication information configured or indicated by the fourth communication device, and the fourth communication device is not the third communication device, the method further includes:
  • the third communication device receives the third information
  • the third information is configured or indicated through at least one of RRC signaling, MAC CE, DCI, SCI and preamble sequence.
  • the signal type of the first signal includes any of the following:
  • the first signal of the first signal type includes a first part and a second part
  • the first signal of the second signal type includes a first part, a second part and a third part.
  • the third part is located between the first part and the second part.
  • the third part occupies the third time unit. length;
  • the signal parameters of the first signal include any of the following One item:
  • the signal parameters of the first signal include any of the following:
  • the signal modulation type of the second signal includes any of the following:
  • a first modulation type which is a modulation type that performs amplitude differential modulation on the first signal
  • a second modulation type which is a modulation type that performs phase differential modulation on the first signal
  • a third modulation type which is a modulation type that performs amplitude and phase differential modulation on the first signal
  • the signal modulation parameters of the second signal include one or more of the following:
  • the third communication device demodulates the second signal modulated bit information from the third signal according to the signal modulation type and signal modulation parameters of the second signal, including:
  • the third communication device subtracts the signal of the first half symbol period and the signal of the second half symbol period in one symbol period of the third signal to obtain a differential signal; in this way, the signal of the first half symbol period and the signal of the second half symbol period are Signal subtraction can subtract cross-link interference or direct link interference and eliminate link interference.
  • the subtraction of two signals may be the signal of the first half symbol period minus the signal of the second half symbol period, or the signal of the second half symbol period minus the signal of the first half symbol period.
  • the signal of the first half symbol period minus the signal of the second half symbol period will be taken as an example.
  • the third communication device demodulates the bit information carried by the second signal according to the differential signal.
  • the third communication device demodulates the bit information of the second signal according to the differential signal, including:
  • the third communication device obtains the decision value of the differential signal through the decision function and the differential signal;
  • the third communication device demodulates the bit information carried by the second signal according to the decision threshold closest to the decision value.
  • different decision thresholds can be set corresponding to different bit information.
  • the corresponding bit information can include 00, 01, 11, 10, corresponding to 00, 01, 11 respectively.
  • the optimal decision threshold set by 10 the bit information carried by the second signal is demodulated according to the decision threshold closest to the decision value of the differential signal.
  • the decision threshold closest to the decision value of the differential signal is Then it can be determined that the bit information carried by the second signal demodulated by the differential signal is 00;
  • D is the minimum channel delay
  • L is the maximum delay spread
  • v 0 [n] w 0 [n]-w 0 [n+N];
  • the constructed statistical decision function is:
  • the optimal decision threshold performance is:
  • ⁇ ( ⁇ ) is the Gamma function.
  • demodulating the bit information modulated by the second signal from the third signal is as follows:
  • the first term ⁇ s(t- ⁇ 2 )b(t)h 1 h 2 is the useful backscattered signal sent from the BSC transmitting equipment
  • the second term h 3 s(t- ⁇ 3 ) is the signal from the radio frequency
  • the direct link interference signal sent by the source w(t) is the Gaussian noise part
  • ⁇ 3 and ⁇ 2 are the multipath delays of the direct link and the backscatter cascade link respectively
  • the receiving end After the receiving end performs synchronization, it determines the modulation and demodulation rules of the second signal according to the instruction information (which can be from the radio frequency source, the sending end or a third-party communication device), and then demodulates according to the following rules:
  • the radio frequency signal is a centralized signal format signal and the BSC modulated signal is a signal of the first modulation type and a modulation order of 2
  • the received signal is The period of the signal is subtracted before Periodic signal, the differential signal obtained is:
  • the radio frequency signal is a centralized signal format signal and the BSC modulated signal is a signal of the third modulation type and a modulation order of 2
  • n 0,...,N-1.
  • n 0,...,N-1.
  • n 0,...,N-1.
  • n 0,...,N-1.
  • the received signal is The period of the signal is subtracted before Periodic signal, the differential signal obtained is:
  • the BSC modulated signal b(t) is a signal of the second modulation type and a modulation order of 2, and satisfies the following properties:
  • the BSC baseband signal is:
  • the BSC baseband signal is:
  • ⁇ , ⁇ , ⁇ represent the amplitude of the second signal
  • ⁇ , ⁇ 1 , ⁇ 2 and ⁇ 3 represent the phase of the signal
  • ⁇ 1 ⁇ 2 .
  • Its baseband signal can be expressed as:
  • the BSC baseband signal is:
  • Embodiment 1 Compared with the traditional solution that only performs modulation in the amplitude dimension, Embodiment 1 only performs information modulation and demodulation in the phase dimension. According to the constant inclusion property of phase modulation, the decision threshold is less affected by SNR, thus achieving better modulation and demodulation performance.
  • Example 2 Second-order amplitude-phase two-dimensional differential modulation
  • the BSC modulated signal b(t) is a signal of the third modulation type and a modulation order of 2, and satisfies the following properties:
  • the BSC baseband signal is:
  • the BSC baseband signal is:
  • ⁇ , ⁇ , ⁇ represent the amplitude of the BSC baseband signal
  • ⁇ ⁇ ⁇ , ⁇ 1 , ⁇ 2 and ⁇ 3 represent the phase of the signal
  • ⁇ 1 ⁇ ⁇ 2 The period of the BSC baseband signal
  • T b 2T s .
  • the BSC baseband signal is:
  • the second embodiment performs information modulation and demodulation in the amplitude and phase dimensions at the same time, thereby obtaining a larger distance between constellation points in the Euclidean space and improving modulation and demodulation. performance.
  • the increased amplitude dimension increases the distance between two constellation points, achieving better performance.
  • the BSC modulated signal b(t) is a signal of the third modulation type and a modulation order of 4, and satisfies the following properties:
  • the BSC baseband signal is:
  • the BSC baseband signal is:
  • the BSC baseband signal is:
  • the BSC baseband signal is:
  • ⁇ 1 , ⁇ 2 , ⁇ 3 , ⁇ 4 , ⁇ , ⁇ , ⁇ , ⁇ represent the amplitude of the BSC baseband signal, and ( ⁇ 1 - ⁇ ) ⁇ ( ⁇ 2 - ⁇ ) ⁇ ( ⁇ 3 - ⁇ ) ⁇ ( ⁇ 4 - ⁇ ); ⁇ 1 , ⁇ 2 , ⁇ 3 , ⁇ 4 , ⁇ 5 , ⁇ 6 , ⁇ 7 , ⁇ 7 represent the phase of the signal, and ( ⁇ 1 - ⁇ 2 ) ⁇ ( ⁇ 3 - ⁇ 4 ) ⁇ ( ⁇ 5 - ⁇ 6 ) ⁇ ( ⁇ 7 - ⁇ 8 ).
  • n 0,...,N-1.
  • n 0,...,N-1.
  • n 0,...,N-1.
  • n 0,...,N-1.
  • bit information is obtained by demodulation.
  • the third embodiment simultaneously performs high-order information modulation and demodulation in the amplitude and phase dimensions, effectively improving the frequency band efficiency of the system and improving the baseband signal modulation. rate.
  • an embodiment of the present application provides a backscattering communication method.
  • the method is executed by a fourth communication device.
  • the fourth communication device is used to unify the radio frequency source in the BSC system.
  • the BSC sender and BSC receiver are configured uniformly;
  • This method includes:
  • Step 1101 Include one or more of the following:
  • the fourth communication device configures or instructs the first information to the first communication device
  • the fourth communication device configures or instructs the second information to the second communication device
  • the fourth communication device configures or instructs the third information to the third communication device
  • the first information is used by the first communication device to determine the first signal
  • the second information is used by the second communication device to determine the second signal
  • the third information is used by the third communication device to determine the signal modulation type and signal modulation of the second signal.
  • the first signal includes a first part and a second part, the first part occupies the length of the first time unit, the second part occupies the length of the second time unit, the length of the first time unit and the length of the second time unit The length is the same, the data in the first time unit is the same as the data in the second time unit, and the second signal is a baseband signal used by the second communication device to differentially modulate the first signal in amplitude dimension and/or phase dimension.
  • the first information includes: first indication information configured or indicated by the fourth communication device, the first indication information being used to indicate the signal type and signal parameters of the first signal;
  • the second information includes: third indication information configured or indicated by the fourth communication device, the third indication information being used to indicate the signal modulation type and signal modulation parameters of the second signal;
  • the third information includes: fifth indication information configured or indicated by the fourth communication device, where the fifth indication information is used to indicate the signal modulation type and signal modulation parameters of the second signal. .
  • the fourth communication device can uniformly configure the BSC communication of the first communication device, the second communication device, and the third communication device, for example, the signal type and signal parameters of the first signal sent by the first communication device, and the signal type and signal parameters of the first communication device.
  • the second communication device configures the signal modulation type and signal modulation parameters of the second signal used for signal modulation, and configures the third communication device with the signal modulation type and signal modulation parameters of the second signal, so that it knows that the second communication device uses The signal modulation method, so that the third communication device can use the corresponding demodulation method to demodulate the signal.
  • the signal type of the first signal includes any of the following:
  • the first signal of the first signal type includes a first part and a second part
  • the first signal of the second signal type includes a first part, a second part and a third part.
  • the third part is located between the first part and the second part.
  • the third part occupies the third time unit. length;
  • the signal parameters of the first signal include any of the following:
  • the signal parameters of the first signal include any of the following:
  • the signal modulation type of the second signal includes any of the following:
  • a first modulation type which is a modulation type that performs amplitude differential modulation on the first signal
  • a second modulation type which is a modulation type that performs phase differential modulation on the first signal
  • a third modulation type which is a modulation type that performs amplitude and phase differential modulation on the first signal
  • the signal modulation parameters of the second signal include one or more of the following:
  • the first information, the second information and/or the third information are configured or indicated by at least one of RRC signaling, MAC CE, DCI, SCI and preamble sequence.
  • the execution subject may be a backscatter communication device.
  • the backscatter communication device performing the backscatter communication method is taken as an example to illustrate the backscatter communication device provided by the embodiment of the present application.
  • an embodiment of the present application provides a backscatter communication device 1210.
  • the backscatter communication device can be applied to the above-mentioned first communication device to perform the method of the above-mentioned first communication device.
  • the backscatter communication device includes :
  • the first determination module 1211 is used to determine the first signal according to the first information
  • the first sending module 1212 is used to send the first signal to the second communication device
  • the first signal includes a first part and a second part
  • the first part occupies the length of the first time unit
  • the second part occupies the length of the second time unit
  • the length of the first time unit is the sum of the length of the first time unit and the length of the second time unit.
  • the second time unit has the same length
  • the data in the first time unit is the same as the data in the second time unit.
  • the first information is used to indicate the signal type and signal parameters of the first signal
  • the signal type of the first signal includes any of the following:
  • the first signal of the first signal type including the first part and the second part
  • a second signal type the first signal of the second signal type includes the first part, the second part and a third part, the third part is located between the first part and the second part. time, the third part occupies the length of the third time unit;
  • the signal parameters of the first signal include any one of the following:
  • the signal parameters of the first signal include any one of the following:
  • the length of the first time unit, and the length of the third time unit are The length of the first time unit, and the length of the third time unit;
  • the length of the second time unit, and the sum of the lengths of the second time unit and the third time unit are the length of the second time unit, and the sum of the lengths of the second time unit and the third time unit.
  • the first information includes: first indication information configured or indicated by a fourth communication device, which is the backscattering communication device, the second communication device, the third Any one of the communication devices, or the fourth communication device is a third-party communication device;
  • the first indication information is used to indicate the signal type and signal parameters of the first signal.
  • the device when the first information includes: first indication information configured or indicated by the fourth communication device, and the fourth communication device is not the backscattering communication device, in Before the backscatter communication device determines the first signal based on the first information, the device further includes:
  • a third receiving module configured for the first communication device to receive the first information
  • the first information is provided by the fourth communication device through at least one of radio resource control RRC signaling, medium access control unit MAC CE, downlink control information DCI, side link control information SCI and preamble sequence. Configuration or instruction.
  • the device further includes:
  • the third sending module is used for:
  • the second indication information is used to indicate the signal type and signal parameters of the first signal, and/or the signal modulation type and signal modulation parameters of the second signal, and the second signal is the second communication
  • the signal type of the first signal includes any of the following:
  • the first signal of the first signal type including the first part and the second part
  • a second signal type the first signal of the second signal type includes the first part, the second part and a third part, the third part is located between the first part and the second part. time, the third part occupies the length of the third time unit;
  • the signal parameters of the first signal include any one of the following:
  • the signal parameters of the first signal include any one of the following:
  • the length of the first time unit, and the length of the third time unit are The length of the first time unit, and the length of the third time unit;
  • the length of the second time unit, and the sum of the lengths of the second time unit and the third time unit are the length of the second time unit, and the sum of the lengths of the second time unit and the third time unit.
  • the signal modulation type of the second signal includes any of the following:
  • a first modulation type the first modulation type being a modulation type that performs amplitude differential modulation on the first signal
  • the second modulation type being a modulation type that performs phase differential modulation on the first signal
  • a third modulation type is a modulation that performs amplitude and phase differential modulation on the first signal. type;
  • the signal modulation parameters of the second signal include one or more of the following:
  • One or more symbol period lengths of the second signal are One or more symbol period lengths of the second signal
  • the modulation order of the second signal is the modulation order of the second signal.
  • the third sending module is implemented for:
  • the second indication information is sent through at least one of RRC signaling, MAC CE, DCI, SCI and preamble sequence.
  • an embodiment of the present application provides a backscatter communication device 1220.
  • the backscatter communication device can be applied to the above-mentioned second communication device to perform the method of the above-mentioned second communication device.
  • the backscatter communication device includes :
  • the first receiving module 1221 is used to receive the first signal sent by the first communication device
  • the second determination module 1222 is used to determine the second signal according to the second information
  • Modulation module 1223 configured to perform backscatter modulation on the first signal according to the second signal to generate a third signal
  • the second sending module 1224 is used to send the third signal to the third communication device
  • the first signal includes a first part and a second part, the first part occupies the length of the first time unit, the second part occupies the length of the second time unit, and the length of the first time unit is the sum of the length of the first time unit and the length of the second time unit.
  • the length of the second time unit is the same, the data in the first time unit is the same as the data in the second time unit, and the second signal is the backscatter communication device's processing of the first signal.
  • the modulation module is used for:
  • the second signal is carried by the amplitude difference value between the first half symbol period and the second half symbol period.
  • bit information when the bit information is the first value, the amplitude value of the second signal is the first amplitude value; when the bit information is the second value, the amplitude value of the first half symbol period of the second signal is the second Amplitude value, the amplitude value of the second half symbol period of the second signal is a third amplitude value, and the second amplitude value and the third amplitude value are mutually different amplitude values;
  • the second signal is carried by the phase difference value between the first half symbol period and the second half symbol period.
  • bit information when the bit information is the first value, the phase value of the second signal is the first phase value; when the bit information is the second value, the phase value of the first half symbol period of the second signal is the second Phase value, the amplitude value of the second half symbol period of the second signal is a third phase value, and the second phase value and the third phase value are mutually different phase values;
  • the second signal passes through the sum of the amplitudes of the first half symbol period and the second half symbol period.
  • the phase difference value carries bit information, and when the bit information is the first value, the amplitude value of the second signal is the first amplitude value, and the phase value of the second signal is the first phase value; the bit information is the second value.
  • the amplitude value of the first half symbol period of the second signal is The second amplitude value
  • the phase value of the first half symbol period of the second signal is the second phase value
  • the amplitude value of the second half symbol period of the second signal is the third amplitude value
  • the second amplitude value of the second signal is the second amplitude value.
  • the phase value of the second half symbol period is the third phase value
  • the second amplitude value and the third amplitude value are mutually different amplitude values
  • the second phase value and the third phase value are mutually different.
  • the second signal passes through the sum of the amplitudes of the first half symbol period and the second half symbol period.
  • the phase difference value carries bit information, and when the bit information is a first value, the amplitude value of the first half symbol period of the second signal is the first amplitude value, and the phase value of the first half symbol period of the second signal is the first amplitude value.
  • the amplitude value of the second half symbol period of the second signal is the second amplitude value
  • the phase value of the second half symbol period of the second signal is the second phase value
  • the bit information is the second value
  • the amplitude value of the first half symbol period of the second signal is the third amplitude value
  • the phase value of the first half symbol period of the second signal is the third phase value
  • the second half symbol period of the second signal is The amplitude value of the period is the fourth amplitude value
  • the phase value of the second half symbol period of the second signal is the fourth phase value
  • the bit information is the third value
  • the amplitude of the first half symbol period of the second signal The value is the fifth amplitude value
  • the phase value of the first half symbol period of the second signal is the fifth phase value
  • the amplitude value of the second half symbol period of the second signal is the sixth amplitude value
  • the second The phase value of the second half symbol period of the signal is the sixth phase value, and when the bit information is the fourth value, the bit
  • the difference, the difference between the eighth amplitude value and the seventh amplitude value is mutually different amplitude values, the difference between the second phase value and the first phase value, the fourth phase value
  • the difference from the third phase value, the difference between the sixth phase value and the fifth phase value, and the difference between the eighth phase value and the seventh phase value are mutually different phases. value.
  • the second information includes: second indication information indicated by the first communication device;
  • the second information includes: third indication information configured or indicated by a fourth communication device, which is any of the first communication device, the backscatter communication device, and a third communication device.
  • a fourth communication device which is any of the first communication device, the backscatter communication device, and a third communication device.
  • One item, or the fourth communication device is a third-party communication device;
  • the second indication information is used to indicate the signal type and signal parameters of the first signal, and/or the signal modulation type and signal modulation parameters of the second signal
  • the third indication information is used to indicate The signal type and signal parameters of the first signal, and/or the signal modulation type and signal modulation parameters of the second signal.
  • the second information includes: second indication information indicated by the first communication device, or the second information includes: third indication information configured or indicated by a fourth communication device, and
  • the fourth communication device is not the backscatter communication device, before determining the second signal according to the second information, the device further includes:
  • a fourth receiving module configured to receive the second information
  • the second information is indicated by at least one of RRC signaling, MAC CE, DCI, SCI and preamble sequence.
  • the device further includes:
  • a fourth sending module configured to send fourth indication information to the third communication device through at least one of RRC signaling, MAC CE, DCI, SCI and preamble sequence;
  • the fourth indication information is used to indicate the signal modulation type and signal modulation parameters of the second signal.
  • the signal type of the first signal includes any of the following:
  • the first signal of the first signal type including the first part and the second part
  • a second signal type the first signal of the second signal type includes the first part, the second part and a third part, the third part is located between the first part and the second part. time, the third part occupies the length of the third time unit;
  • the signal parameters of the first signal include any one of the following:
  • the signal parameters of the first signal include any one of the following:
  • the length of the first time unit, and the length of the third time unit are The length of the first time unit, and the length of the third time unit;
  • the length of the second time unit, and the sum of the lengths of the second time unit and the third time unit are the length of the second time unit, and the sum of the lengths of the second time unit and the third time unit.
  • the signal modulation type of the second signal includes any of the following:
  • a first modulation type the first modulation type being a modulation type that performs amplitude differential modulation on the first signal
  • the second modulation type being a modulation type that performs phase differential modulation on the first signal
  • a third modulation type being a modulation type that performs amplitude and phase differential modulation on the first signal
  • the signal modulation parameters of the second signal include one or more of the following:
  • One or more symbol period lengths of the second signal are One or more symbol period lengths of the second signal
  • the modulation order of the second signal is the modulation order of the second signal.
  • an embodiment of the present application provides a backscatter communication device 1230.
  • the backscatter communication device can be applied to the above-mentioned third communication device to perform the method of the above-mentioned third communication device.
  • the backscatter communication device includes :
  • the second receiving module 1231 is used to receive the third signal sent by the second communication device
  • the third determination module 1232 is used to determine the signal modulation type and signal modulation parameters of the second signal according to the third information
  • Demodulation module 1233 configured to demodulate bit information of the second signal from the third signal according to the signal modulation type and signal modulation parameters of the second signal;
  • the third signal is a signal generated by the second communication device modulating the first signal sent by the first communication device according to the second signal
  • the second signal is a signal generated by the second communication device modulating the first signal sent by the first communication device.
  • the baseband signal used when the first signal is differentially modulated in the amplitude dimension and/or the phase dimension, the first signal includes a first part and a second part, the first part occupies the length of the first time unit, and the second part Partially occupies the length of the second time unit, the length of the first time unit is the same as the length of the second time unit, and the data in the first time unit is the same as the data in the second time unit.
  • the third information includes: second indication information indicated by the first communication device;
  • the third information includes: fourth indication information indicated by the second communication device;
  • the third information includes: fifth indication information configured or indicated by a fourth communication device, which is one of the first communication device, the second communication device, and the backscatter communication device. Any one of the above, or the fourth communication device is a third-party communication device;
  • the second indication information is used to indicate the signal modulation type and signal modulation parameters of the second signal
  • the fourth indication information is used to indicate the signal modulation type and signal modulation parameters of the second signal
  • the The fifth indication information is used to indicate the signal modulation type and signal modulation parameters of the second signal.
  • the third information includes: second indication information indicated by the first communication device, or the third information includes: fourth indication information indicated by the second communication device, or The third information includes: fifth indication information configured or indicated by the fourth communication device, and when the fourth communication device is not the backscatter communication device, the device further includes:
  • the fifth receiving module is used to receive the third information
  • the third information is configured or indicated by at least one of RRC signaling, MAC CE, DCI, SCI and preamble sequence.
  • the signal type of the first signal includes any of the following:
  • the first signal of the first signal type including the first part and the second part
  • a second signal type the first signal of the second signal type includes the first part, the second part and a third part, the third part is located between the first part and the second part. time, the third part occupies the length of the third time unit;
  • the signal parameters of the first signal include any one of the following:
  • the signal parameters of the first signal include any one of the following:
  • the length of the first time unit, and the length of the third time unit are The length of the first time unit, and the length of the third time unit;
  • the length of the second time unit, and the sum of the lengths of the second time unit and the third time unit are the length of the second time unit, and the sum of the lengths of the second time unit and the third time unit.
  • the signal modulation type of the second signal includes any of the following:
  • a first modulation type the first modulation type being a modulation type that performs amplitude differential modulation on the first signal
  • the second modulation type being a modulation type that performs phase differential modulation on the first signal
  • a third modulation type being a modulation type that performs amplitude and phase differential modulation on the first signal
  • the signal modulation parameters of the second signal include one or more of the following:
  • One or more symbol period lengths of the second signal are One or more symbol period lengths of the second signal
  • the modulation order of the second signal is the modulation order of the second signal.
  • the demodulation module is used for:
  • the bit information carried by the second signal is demodulated.
  • the demodulation module is used for:
  • the bit information carried by the second signal is demodulated according to the decision threshold value that is closest to the decision value.
  • an embodiment of the present application provides a backscatter communication device 1240.
  • the backscatter communication device can be applied to the above-mentioned fourth communication device to perform the method of the above-mentioned fourth communication device.
  • the backscatter communication device includes :
  • Configuration module 1241 used for one or more of the following:
  • the first information is used for the first communication device to determine the first signal
  • the second information is used for the second communication device to determine the second signal
  • the third information is used for the third communication
  • the device determines the signal of the second signal Modulation type and signal modulation parameters
  • the first signal includes a first part and a second part, the first part occupies the length of the first time unit, the second part occupies the length of the second time unit, the first time
  • the length of the unit is the same as the length of the second time unit
  • the data in the first time unit is the same as the data in the second time unit
  • the second signal is the response of the second communication device to the
  • the baseband signal used when the first signal is differentially modulated in the amplitude dimension and/or the phase dimension.
  • the first information includes: first indication information configured or indicated by the fourth communication device, the first indication information being used to indicate the signal type and signal parameters of the first signal;
  • the second information includes: third indication information configured or indicated by the fourth communication device, the third indication information being used to indicate the signal modulation type and signal modulation parameters of the second signal;
  • the third information includes: fifth indication information configured or indicated by the fourth communication device, where the fifth indication information is used to indicate the signal modulation type and signal modulation parameters of the second signal. .
  • the signal type of the first signal includes any of the following:
  • the first signal of the first signal type including the first part and the second part
  • a second signal type the first signal of the second signal type includes the first part, the second part and a third part, the third part is located between the first part and the second part. time, the third part occupies the length of the third time unit;
  • the signal parameters of the first signal include any one of the following:
  • the signal parameters of the first signal include any one of the following:
  • the length of the first time unit, and the length of the third time unit are The length of the first time unit, and the length of the third time unit;
  • the length of the second time unit, and the sum of the lengths of the second time unit and the third time unit are the length of the second time unit, and the sum of the lengths of the second time unit and the third time unit.
  • the signal modulation type of the second signal includes any of the following:
  • a first modulation type the first modulation type being a modulation type that performs amplitude differential modulation on the first signal
  • the second modulation type being a modulation type that performs phase differential modulation on the first signal
  • a third modulation type being a modulation type that performs amplitude and phase differential modulation on the first signal
  • the signal parameters of the second signal include one or more of the following:
  • the modulation order of the second signal is the modulation order of the second signal.
  • the first information, the second information and/or the third information are configured or indicated by at least one of RRC signaling, MAC CE, DCI, SCI and a preamble sequence.
  • the backscattering communication 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.
  • 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 backscattering communication device provided by the embodiments of the present application can implement each process implemented by the method embodiments in Figures 7 to 11 and achieve the same technical effect. To avoid duplication, the details will not be described here.
  • this embodiment of the present application also provides a communication device 1300, which includes a processor 1301 and a memory 1302.
  • the memory 1302 stores programs or instructions that can be run on the processor 1301, such as , when the communication device 1300 is a terminal, when the program or instruction is executed by the processor 1301, each step of the above method embodiment is implemented, and the same technical effect can be achieved.
  • the communication device 1300 is a network-side device, when the program or instruction is executed by the processor 1301, the steps of the above backscatter communication method embodiment are implemented, and the same technical effect can be achieved. To avoid duplication, they will not be described again here.
  • An embodiment of the present application also provides a communication device, including a processor and a communication interface;
  • the processor is used by the first communication device to determine the first signal according to the first information
  • the communication interface is used for the first communication device to send a first signal to a second device
  • the first signal includes a first part and a second part
  • the first part occupies the length of the first time unit
  • the second part occupies the length of the second time unit
  • the length of the first time unit is the sum of the length of the first time unit and the length of the second time unit.
  • the length of the second time unit is the same
  • the data in the first time unit is the same as the data in the second time unit.
  • the communication interface is used by the second communication device to receive the first signal sent by the first communication device;
  • the processor is configured for the second communication device to determine a second signal according to the second information
  • the processor is configured for the second communication device to modulate the first signal according to the second signal and generate a third signal
  • the communication interface is used by the second communication device to send the third signal to a third communication device
  • the first signal includes a first part and a second part, the first part occupies the length of the first time unit, the second part occupies the length of the second time unit, and the length of the first time unit is the sum of the length of the first time unit and the length of the second time unit.
  • the length of the second time unit is the same, the data in the first time unit is the same as the data in the second time unit, and the second time unit
  • the signal is a baseband signal used by the second communication device when differentially modulating the first signal in an amplitude dimension and/or a phase dimension.
  • the communication interface is used by the third communication device to receive the third signal sent by the second communication device;
  • the processor is configured for the third communication device to determine the signal modulation type and signal modulation parameters of the second signal according to the third information
  • the processor is configured for the third communication device to demodulate the bit information of the second signal from the third signal according to the signal modulation type and signal modulation parameters of the second signal;
  • the third signal is a signal generated by the second communication device performing backscatter modulation on the first signal sent by the first communication device according to the second signal
  • the second signal is a signal generated by the second communication device.
  • the first signal includes a first part and a second part. The first part occupies the length of the first time unit, so The second part occupies the length of the second time unit, the length of the first time unit is the same as the length of the second time unit, and the data in the first time unit is the same as the data in the second time unit. same.
  • the communication interface is used for:
  • the fourth communication device configures or instructs the first information to the first communication device
  • the fourth communication device configures or instructs the second information to the second communication device
  • the fourth communication device configures or instructs the third information to the third communication device
  • the first information is used for the first communication device to determine the first signal
  • the second information is used for the second communication device to determine the second signal
  • the third information is used for the third communication
  • the device determines the signal modulation type and signal modulation parameters of the second signal
  • the first signal includes a first part and a second part
  • the first part occupies the length of a first time unit
  • the second part occupies a second time
  • the length of the unit, the length of the first time unit and the length of the second time unit are the same
  • the data in the first time unit is the same as the data in the second time unit
  • the second signal is The baseband signal used by the second communication device when differentially modulating the first signal in amplitude dimension and/or phase dimension.
  • Embodiments of the present application also provide a readable storage medium.
  • Programs or instructions are stored on the readable storage medium.
  • the program or instructions are executed by a processor, each process of the above backscatter communication method embodiment is implemented, and can To achieve the same technical effect, to avoid repetition, we will not repeat them here.
  • the processor is the processor in the terminal described in the above embodiment.
  • the readable storage media includes computer-readable storage media, such as computer read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disks or optical disks, 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 backscatter communication method.
  • Each process in the example can achieve the same technical effect. To avoid repetition, we will not repeat it here.
  • 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 backscatter communication method.
  • Each process of the embodiment can achieve the same technical effect, so to avoid repetition, it will not be described again here.
  • Embodiments of the present application also provide a backscatter communication system, including: a first communication device, a second communication device, a third communication device and a fourth communication device.
  • the first communication device can be used to perform the first aspect
  • the steps of the backscatter communication method the second communication device can be used to perform the steps of the backscatter communication method as described in the second aspect
  • the third communication device can be used to perform the steps of the backscatter communication method as described in the third aspect.
  • the fourth communication device may be configured to perform the steps of the backscatter communication method as described in the fourth aspect.
  • the fourth communication device may be any one of the first communication device, the second communication device, and the third communication device, or the fourth communication device may be a third-party communication device; optionally, the first communication device
  • the communication device and the third communication device can also be set as the same hardware device in actual application scenarios.
  • 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.
  • the technical solution of the present application can be embodied in the form of a computer software product that is essentially or contributes to related technologies.
  • the computer software product is stored in a storage medium (such as ROM/RAM, disk, CD), including several instructions to cause a terminal (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in various embodiments of this application.

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Abstract

本申请公开了一种反向散射通信方法、设备及可读存储介质,属于通信技术领域,该方法包括:第一通信设备根据第一信息确定第一信号;并向第二设备发送第一信号;第二通信设备根据第二信息确定第二信号;并根据第二信号对第一信号进行幅度维度和/或相位维度差分调制,生成第三信号;第三通信设备根据第三信息确定第二信号的信号调制类型和信号调制参数;并根据第二信号的信号调制类型和信号调制参数从第三信号中解调制出第二信号的比特信息。第一信号包括第一部分和第二部分,第一部分占用第一时间单元的长度,第二部分占用第二时间单元的长度,第一时间单元的长度和第二时间单元的长度相同,第一时间单元中的数据与第二时间单元中的数据相同。

Description

反向散射通信方法、设备及可读存储介质
相关申请的交叉引用
本申请主张在2022年07月19日在中国提交的中国专利申请No.202210851640.8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,具体涉及一种反向散射通信方法、设备及可读存储介质。
背景技术
未来的第6代(6th Generation,6G)通信网络需要支持海量的万物互联,其中物联网设备数量将达到千亿级别,其连接密度相比5G提升了10-100倍,达到10-100个/m2的连接密度。海量的物联网设备对成本和功耗都提出了新的挑战。蜂窝网络化、低成本、低功耗甚至零功耗无源化是未来物联网设备发展的主要趋势。受限于网络节点的发送功率、双程链路衰减、储能电路的储能效率与储能容量、反向散射通信设备的接收灵敏度、收发天线增益以及信号干扰的影响,反向散射通信的前向和反向覆盖都面临较大的技术挑战。采用双基地分离式架构是提升反向散射通信覆盖最有效的方式之一,有效的避免单基地反向散射通信中的双程信号衰减的问题。通过合理的放置射频源和反向散射通信接收端的位置,甚至部署专门用于射频供能的射频源,可以有效的提升反向散射通信的传输覆盖。
在反向散射通信系统中,接收信号是有用的反向散射信号和同频的直接链路干扰信号或自干扰信号的叠加,且自干扰信号和直接链路干扰信号的强度可能远大于反向散射信号强度,因而导致反向散射通信中的干扰消除技术难度较大。
发明内容
本申请实施例提供一种反向散射通信方法、设备及可读存储介质,能够解决反向散射通信系统中干扰消除困难的问题。
第一方面,提供了一种反向散射通信方法,包括:
第一通信设备根据第一信息确定第一信号;
所述第一通信设备向第二通信设备发送所述第一信号;
其中,所述第一信号包括第一部分和第二部分,所述第一部分占用第一时间单元的长度,所述第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同。
第二方面,提供了一种反向散射通信方法,包括:
第二通信设备接收第一通信设备发送的第一信号;
所述第二通信设备根据第二信息确定第二信号;
所述第二通信设备根据所述第二信号对所述第一信号进行调制,生成第三信号;
所述第二通信设备向第三通信设备发送所述第三信号;
其中,所述第一信号包括第一部分和第二部分,所述第一部分占用第一时间单元的长度,所述第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同,所述第二信号是所述第二通信设备对所述第一信号进行幅度维度和/或相位维度差分调制时所使用的基带信号。
第三方面,提供了一种反向散射通信方法,包括:
第三通信设备接收第二通信设备发送的第三信号;
所述第三通信设备根据第三信息确定第二信号的信号调制类型和信号调制参数;
所述第三通信设备根据所述第二信号的信号调制类型和信号调制参数从所述第三信号中解调制出第二信号调制的比特信息;
其中,所述第三信号是所述第二通信设备根据所述第二信号对第一通信设备发送的第一信号进行调制生成的信号,所述第二信号是所述第二通信设备对所述第一信号进行幅度维度和/或相位维度差分调制时所使用的基带信号,所述第一信号包括第一部分和第二部分,所述第一部分占用第一时间单元的长度,所述第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同。
第四方面,提供了一种反向散射通信方法,包括以下一项或者多项:
第四通信设备向第一通信设备配置或指示第一信息;
所述第四通信设备向第二通信设备配置或指示第二信息;
所述第四通信设备向第三通信设备配置或指示第三信息;
其中,所述第一信息用于所述第一通信设备确定第一信号,所述第二信息用于所述第二通信设备确定第二信号,所述第三信息用于所述第三通信设备确定所述第二信号的信号调制类型和信号调制参数,所述第一信号包括第一部分和第二部分,所述第一部分占用第一时间单元的长度,所述第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同,所述第二信号是所述第二通信设备对所述第一信号进行幅度维度和/或相位维度差分调制时所使用的基带信号。
第五方面,提供了一种反向散射通信装置,包括:
第一确定模块,用于根据第一信息确定第一信号;
第一发送模块,用于向第二通信设备发送所述第一信号;
其中,所述第一信号包括第一部分和第二部分,所述第一部分占用第一时间单元的长 度,所述第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同。
第六方面,提供了一种反向散射通信装置,包括:
第一接收模块,用于接收第一通信设备发送的第一信号;
第二确定模块,用于根据第二信息确定第二信号;
调制模块,用于根据所述第二信号对所述第一信号进行反向散射调制,生成第三信号;
第二发送模块,用于向第三通信设备发送所述第三信号;
其中,所述第一信号包括第一部分和第二部分,所述第一部分占用第一时间单元的长度,所述第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同,所述第二信号是所述反向散射通信装置对所述第一信号进行幅度维度和/或相位维度差分调制时所使用的基带信号。
第七方面,提供了一种反向散射通信装置,包括:
第二接收模块,用于接收第二通信设备发送的第三信号;
第三确定模块,用于根据第三信息确定第二信号的信号调制类型和信号调制参数;
解调模块,用于根据所述第二信号的信号调制类型和信号调制参数从所述第三信号中解调制出第二信号的比特信息;
其中,所述第三信号是所述第二通信设备根据所述第二信号对第一通信设备发送的第一信号进行调制生成的信号,所述第二信号是所述第二通信设备对所述第一信号进行幅度维度和/或相位维度差分调制时所使用的基带信号,所述第一信号包括第一部分和第二部分,所述第一部分占用第一时间单元的长度,所述第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同。
第八方面,提供了一种反向散射通信装置,包括:
配置模块,用于以下一项或者多项:
向第一通信设备配置或指示第一信息;
向第二通信设备配置或指示第二信息;
向第三通信设备配置或指示第三信息;
其中,所述第一信息用于所述第一通信设备确定第一信号,所述第二信息用于所述第二通信设备确定第二信号,所述第三信息用于所述第三通信设备确定所述第二信号的信号调制类型和信号调制参数,所述第一信号包括第一部分和第二部分,所述第一部分占用第一时间单元的长度,所述第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同,所述第二信号是所述第二通信设备对所述第一信号进行幅度维度和/或相位维度差分调制时所使用的基带信号。
第九方面,提供了一种通信设备,该终端包括处理器和存储器,所述存储器存储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第一方面所述的方法的步骤,或者实现如第二方面所述的方法的步骤,或者实现如第三方面所述的方法的步骤,或者实现如第四方面所述的方法的步骤。
第十方面,提供了一种通信设备,包括处理器及通信接口;
其中,所述处理器,用于第一通信设备根据第一信息确定第一信号;
所述通信接口,用于所述第一通信设备向第二设备发送第一信号;
其中,所述第一信号包括第一部分和第二部分,所述第一部分占用第一时间单元的长度,所述第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同。
或者,
所述通信接口,用于第二通信设备接收第一通信设备发送的第一信号;
所述处理器,用于所述第二通信设备根据第二信息确定第二信号;
所述处理器,用于所述第二通信设备根据所述第二信号对所述第一信号进行调制,生成第三信号;
所述通信接口,用于所述第二通信设备向第三通信设备发送所述第三信号;
其中,所述第一信号包括第一部分和第二部分,所述第一部分占用第一时间单元的长度,所述第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同,所述第二信号是所述第二通信设备对所述第一信号进行幅度维度和/或相位维度差分调制时所使用的基带信号。
或者,
所述通信接口,用于第三通信设备接收第二通信设备发送的第三信号;
所述处理器,用于所述第三通信设备根据第三信息确定第二信号的信号调制类型和信号调制参数;
所述处理器,用于所述第三通信设备根据所述第二信号的信号调制类型和信号调制参数从所述第三信号中解调制出第二信号的比特信息;
其中,所述第三信号是所述第二通信设备根据所述第二信号对第一通信设备发送的第一信号进行调制生成的信号,所述第二信号是所述第二通信设备对所述第一信号进行幅度维度和/或相位维度差分调制时所使用的基带信号,所述第一信号包括第一部分和第二部分,所述第一部分占用第一时间单元的长度,所述第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同。
或者,
所述通信接口,用于:
第四通信设备向第一通信设备配置或指示第一信息;
所述第四通信设备向第二通信设备配置或指示第二信息;
所述第四通信设备向第三通信设备配置或指示第三信息;
其中,所述第一信息用于所述第一通信设备确定第一信号,所述第二信息用于所述第二通信设备确定第二信号,所述第三信息用于所述第三通信设备确定所述第二信号的信号调制类型和信号调制参数,所述第一信号包括第一部分和第二部分,所述第一部分占用第一时间单元的长度,所述第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同,所述第二信号是所述第二通信设备对所述第一信号进行幅度维度和/或相位维度差分调制时所使用的基带信号。
第十一方面,提供了一种反向散射通信系统,包括:第一通信设备、第二通信设备、第三通信设备和第四通信设备,所述第一通信设备可用于执行如第一方面所述的反向散射通信方法的步骤,所述第二通信设备可用于执行如第二方面所述的反向散射通信方法的步骤,所述第三通信设备可用于执行如第三方面所述的反向散射通信方法的步骤,所述第四通信设备可用于执行如第四方面所述的反向散射通信方法的步骤。
第十二方面,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第一方面所述的方法的步骤,或者实现如第二方面所述的方法的步骤,或者实现如第三方面所述的方法的步骤,或者实现如第四方面所述的方法的步骤。
第十三方面,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程序或指令,实现如第一方面所述的方法的步骤,或者实现如第二方面所述的方法的步骤,或者实现如第三方面所述的方法的步骤,或者实现如第四方面所述的方法的步骤。
第十四方面,提供了一种计算机程序/程序产品,所述计算机程序/程序产品被存储在存储介质中,所述计算机程序/程序产品被至少一个处理器执行以实现如第一方面所述的方法的步骤,或者实现如第二方面所述的方法的步骤,或者实现如第三方面所述的方法的步骤,或者实现如第四方面所述的方法的步骤。
在本申请实施例中,第一通信设备发出的第一信号包括占用第一时间单元的长度的第一部分和占用第二时间单元的长度的第二部分,第一时间单元中的数据与第二时间单元中的数据相同,即第一信号具有重复时域结构。后续由第二通信设备根据第二信号对第一信号进行幅度维度和/或相位维度差分调制,得到第三信号,第三通信设备对根据第二信号的信号调制类型和信号调制参数从第三信号中解调制出第二信号的比特信息。这样,一方面利用第一信号的重复时域结构来消除链路干扰;一方面利用幅度维度和/或相位维度差分调制来提升信号的调制和解调制性能,或利用幅度维度和/或相位维度差分调制来提升系统的频带利用率提升基带信号的速率,通过幅度维度和/或相位维度差分调制完成链路 干扰消除和调制信号解调。
附图说明
图1a是相关技术中反向散射通信发送端的结构示意图;
图1b是相关技术中反向散射通信接收端的结构示意图;
图2是相关技术中反向散射通信发送端的调制电路的结构示意图;
图3是相关技术中单基地反向散射通信系统的结构示意图;
图4是相关技术中双基地反向散射通信系统的结构示意图之一;
图5是相关技术中双基地反向散射通信系统的结构示意图之二;
图6是用于干扰消除的源射频信号的BSC基带信号的示意图;
图7是本申请实施例提供的反向散射通信方法的流程示意图之一;
图8a是本申请实施例提供的第一信号的结构示意之一;
图8b是本申请实施例提供的第一信号的结构示意之二;
图9是本申请实施例提供的反向散射通信方法的流程示意图之二;
图10是本申请实施例提供的反向散射通信方法的流程示意图之三;
图11是本申请实施例提供的反向散射通信方法的流程示意图之四;
图12a是本申请实施例提供的反向散射通信装置的结构示意图之一;
图12b是本申请实施例提供的反向散射通信装置的结构示意图之二;
图12c是本申请实施例提供的反向散射通信装置的结构示意图之三;
图12d是本申请实施例提供的反向散射通信装置的结构示意图之四;
图13是本申请实施例提供的通信设备的结构示意图。
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。此外,说明书以及权利要求中“和/或”表示所连接对象的至少其中之一,字符“/”一般表示前后关联对象是一种“或”的关系。
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,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。本申请实施例中的术语“系统”和“网络”常被可互换地使用,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。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,但是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。
为更好的理解本申请的技术方案,首先对以下内容进行介绍:
反向散射通信(Backscatter Communication,BSC)
反向散射通信是指反向散射通信设备利用其它设备或者环境中的射频信号进行信号调制来传输自己信息,是一种比较典型的无源物联设备。图1a为反向散射通信发送端,其基本构成模块及主要功能包括:
天线单元101:用于接收射频信号、控制命令,同时用于发送已调制的反向散射信号。
能量采集模块或供能模块102:该模块用于反向散射通信设备进行射频能量采集,或者其它能量采集,包括但不限于太阳能、动能、机械能、热能等。另外除了能量采集模块,也可能包括电池供能模块。能量采集模块或供能模块给设备中的其它所有模块进行供电。
微控制器103:包括控制基带信号处理、储能或数据调度状态、开关切换、系统同步等。
信号接收模块104:用于接收控制命令或数据等。
信道编码和调制模块105:在微控制器的控制下进行信道编码和信号调制,并通过选择开关在微控制器的控制下通过选择不同的负载阻抗来实现调制;
存储器或传感模块106:用于存储设备的ID信息、位置信息或是传感数据等。
除了上述典型的构成模块之外,反向散射通信发送端还可以集成低功耗放大器模块,用于提升发送端的接收灵敏度和发送功率。
图1b为反向散射通信接收端,传统的射频识别(Radio Frequency Identification,RFID)系统中的反向散射通信接收端即为阅读器,其基本构成模块及主要功能包括:
天线单元111:用于接收调制的反向散射信号。
反向散射信号检波模块112:即用于对发送端发送的反向散射信号进行检波,包括幅移键控(Amplitude Shift Keying,ASK)检波、相移键控(Phase-Shift Keying,PSK)检波、频移键控(Frequency-Shift Keying,FSK)检波或正交振幅调制(Quadrature Amplitude Modulation,QAM)检波等。
解调解码模块113:对检波出的信号进行解调制和解码,以恢复出原始信息流。
其调制电路如图2所示,反向散射通信设备通过调节其内部阻抗来控制电路的反射系数Γ,从而改变入射信号的幅度、频率、相位等,实现信号的调制。其中信号的反射系数 可表征为:
其中,Z0为天线特性阻抗,Z1是负载阻抗,j表示复数,θT表示相位。假设入射信号为Sin(t),则输出信号为因此,通过合理的控制反射系数可实现对应的幅度调制、频率调制或相位调制。基于此,反向散射通信设备,可以是传统射频识别标识(Radio Frequency Identification,RFID)中的标签(Tag),或者是无源或半无源物联网(Passive/Semi-passive Internet of Things,IoT)。为了方便,这里统称为BSC设备。
单基地反向散射通信系统(Monostatic Backscatter Communication System,MBCS)及信号自干扰
如图3所示为MBCS,比如传统的RFID系统就是典型的MBCS,系统中包含BSC发送端(比如Tag)和读写器(Reader)。读写器(Reader)中包含RF射频源和BSC接收端,其中RF射频源用于产生射频信号从而来给BSC发送端/Tag供能。BSC发送端通过反向散射经过调制后的RF射频信号,Reader中的BSC接收端接收到该反向散射信号后进行信号解调。由于RF射频源和BSC接收端是在同一个设备中,比如这里的Reader,因此称为单基地或单站反向散射通信系统。MBCS系统中,由于从BSC发送端发送出去的RF射频信号会经过往返信号的信号衰减引起的双倍远近效应,因而信号的能量衰减大,因而MBCS系统一般用于短距离的反向散射通信,比如传统的RFID应用。
在单基地反向散射通信中,由于射频源&反向散射通信接收端一方面向外发射射频载波为反向散射通信设备提供能量和目标载波,另一方面还要接收反向散射通信设备反向散射传输的有用信号,这种全双工工作机制导致接收机的前端的载波泄露。射频源&反向散射通信接收端(读写器)工作时,接收天线将同时接收到频率相同的有用信号和载波泄露引起的自干扰信号,且自干扰信号的信号强度远远大于接收到的有用反向散射信号。具体来说,产生载波泄露的自干扰信号的原因有三个因素:(1)收发之间有限的隔离度使得发射端载波泄露到接收前端;(2)读写器天线的失配造成载波信号反射到接收前端;(3)环境对载波信号的反射再次进入接收天线。因为,为了减少载波泄露带来的信号自干扰,可以在读写器结构中将读写器收发通道隔离,比如采用收、发天线分离的双天线结构;采用多端口的环形器;采用耦合器等。对于已经泄露出来的载波泄露,可以进一步采用载波消除技术或自干扰消除技术进行载波泄露消除,从而提高接收机的灵敏度。
双基地反向散射通信系统(Bistatic Backscatter Communication System,BBCS)及直接链路干扰不同于MBCS系统,BBCS系统中的RF射频源、BSC发送设备和BSC接收设备是分开的,如图4所示为BBCS系统的示意图。因而,BBCS避免了往返信号衰减大的问题,另外通过合理的放置RF射频源的位置可以进一步提高BBCS通信系统的性能。值得注意,环境反向散射通信(Ambient Backscatter Communication Systems,ABCS)也是双基地反向散射通信的一种,但与BBCS系统中的射频源为专用的信号射频源,ABCS系统中的射频源可以是可用的环境早的射频源,比如:电视塔、蜂窝基站、无线保真(Wireless  Fidelity,WiFi)信号、蓝牙信号等。
不同于单基地反向散射通信中存在的自干扰信号,双基地反向散射通信系中存在的是射频源到反向散射通信接收端的直接链路干扰或跨链路干扰。并且由于该直接链路干扰可能是经过调制的信号,且而反向散射通信接收端一般不知道直接链路信号的调制特性,因而进行直接链路干扰消除的挑战更大。下面以消除直接链路干扰为例解释干扰消除的相关技术。
假设射频源发送的射频载波信号为s(t),射频源到BSC发送设备的信道为h1,BSC发送设备用于调制射频载波信号s(t)的基带信号为b(t),由射频源到BSC接收设备以及BSC发送设备到BSC接收设备的信道分别为h3,h2,则BSC接收设备的接收信号为:
y(t)=h3(t)*s(t)+h2(t)*α·b(t(*h1(t)*s(t)+w(t)=(h3(t)+h2(t)*αb(t)·h1(t))*s(t)+w(n);
其中,h2(t)*α·b(t)*h1(t)*s(t)为反向散射信号,h3(t)*s(t)为直接链路或跨链路干扰信号,w(n)为高斯噪声,*为时域卷积,α为反射系数。由于反向散射信号和直接链路干扰信号是同频同时发送的,且由于直接链路干扰信号的信号功率通常比反向散射信号功率大很多,因此直接链路干扰信号对解调有效基带信号b(t)的影响很大。
直接链路干扰消除方法
最简单的接收端解调方式是将直接链路干扰当成噪声,并且使用硬判决来进行解调,但这种算法的解调性能会因为干扰项的存在而大大恶化。为了有效的消除来自射频源的强直接链路干扰,可以基于射频载波信号的时域结构和频域结构特性并联合反向散射基带信号设计,接收端能够有效的消除强直接链路干扰。考虑用于射频载波信号是LTE和NR系统中广泛使用的正交频分复用(Orthogonal frequency division multiplex,OFDM)信号波形,研究者根据OFDM信号中存在循环前缀(Cyclic prefix,CP)时域重复结构的特性,通过联合设计反向散射通信设备中的差分类基带调制信号,在信道时延不超过CP长度的情况下能够有效的消除强直接链路干扰。除了利用OFDM时域上的重复结构,也可以利用OFDM频域上的保护带来进行干扰消除,通过基带信号等效频率搬移到不同的保护带来进行信号调制。相同的设计思想也可以扩展到未调制的单正弦波射频信号等。下面以单正弦波为射频载波信号为例,阐述消除双基地反向散射通信中的直接链路干扰的阐述其主要过程。
如图5所示,假设射频源发送的射频信号是单频正弦波的信号,表示为:
其中,Ps,Ts,φs表示该射频信号的功率、周期和初始相位。假设BSC发送端对接收到的射频信号进行调制,并生成反向散射信号:
x(t)=αb(t)s(t);
其中,α表示反射系数,b(t)表示调制的基带信号。
BSC接收端接收到的信号有:
y(t)=h3s(t)+h1h2x(t)+w(t);
其中,为高斯噪声。由于双基地之间的通信距离较近,因此信号s(t)与x(t)之间的时延可以忽略,因此接收信号可简化为:
y(t)=[h3+h1h2αb(t)]s(t)+w(t);
上式中的第一项即为直接链路干扰信号,第二项为有用的反向散射信号。收到双程信道衰减的影响,直接链路干扰信号功率将远大于反向散射信号,且由于使用相同的射频信号,因此二者还是同频信号。
为了有效消除直接链路干扰的影响,可以通过联合设计射频信号与BSC基带信号,图6为用于干扰消除的源射频信号的BSC基带信号。
通过调整BSC调制信号的符号周期Tb与载频信号的周期Ts,并满足:
Tb=2KTs,K∈N+
另外,可以定义反向散射通信基带信号采用Miller编码,即如果发送比特B=0,基带信号为:
b(t)=0,0≤t≤Tb
当发送比特B=1,基带信号为:
读写器以Tb/N的采样率对接收信号进行采样。基于Miller码的信号结构,将接收信号的后半个Tb周期的信号减去前半个Tb周期的信号,得到差分信号:
根据Tb=2KTs的关系以及Miller性质可知,跨链路干扰或直接链路干扰被减掉,并且得到反向散射信号的差分信号如下:
其中从上式可以看出,由于源信号的重复时域结构以及BSC基带信号采用了Miller编码,直接链路干扰项被有效的消除了,并且该种方法是处于非相干检测方法,因而也不存在载波频率偏移(Carrier Frequency Offset,CFO)等问题。
下面结合附图,通过一些实施例及其应用场景对本申请实施例提供的反向散射通信方法进行详细地说明。
参见图7,本申请实施例提供一种反向散射通信方法,该方法的执行主体为第一通信设备,在一些应用场景中,该第一通信设备具体可以是BSC系统中的射频源,用于为BSC发送端提供射频载波信号;
该方法,包括:
步骤701:第一通信设备根据第一信息确定第一信号;
步骤702:第一通信设备向第二通信设备发送第一信号;
上述第二通信设备具体可以是BSC系统中的BSC发送端,相应地,第一通信设备向第二通信设备发送第一信号,等同于射频源向BSC发送端提供射频信号。具体的,第一信号也可以称之为射频信号、载波信号或者射频载波信号。
上述第一信号包括第一部分和第二部分,第一部分占用第一时间单元的长度,第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,第一时间单元中的数据与第二时间单元中的数据相同。
在本申请实施例中,第一通信设备发出的第一信号包括占用第一时间单元的长度的第一部分和占用第二时间单元的长度的第二部分,第一时间单元中的数据与第二时间单元中的数据相同,即第一信号具有重复时域结构。这样,利用第一信号的重复时域结构来消除链路干扰。
可以理解的是,上述第一时间单元和第二时间单元帧、子帧、时隙、子时隙、符号、符号集等,本申请实施例对时间单元的具体类别不做限定。
在一种具体的实施方式中,第一信息用于指示第一信号的信号类型和信号参数;
其中,第一信号的信号类型包括以下任意一项:
第一信号类型,第一信号类型的第一信号包括第一部分和第二部分;
第二信号类型,第二信号类型的第一信号包括第一部分、第二部分和第三部分,第三部分位于第一部分和第二部分之间,第三部分占用第三时间单元的长度;
上述第一信号类型和第二信号类型分别对应了两种第一信号的信号格式,具体的,上述第一信号类型可以称之为集中式,上述第一信号类型可以称之为分布式;
参见图8a和图8b,以时间单元类别为时隙(slot)为例,图8a示出了集中式的第一信号的结构,图8b示出了分布式的第一信号的结构;
具体参见图8a,射频源发送满足射频信号s(t):
s(t)中包括极性和数据完全相同的两个时隙块(slot1和slot2),每两个时隙块是集中式,组成一个基本时隙块,每个时隙中的数据长度为N,周期长度为Ts,且是随机的。
其中,m表示的是射频信号中的第m个slot,x(n)表示长度为n的随机数据;
具体参见图8b,射频源发送满足载波信号s(t):
s(t)中包括极性和数据完全相同的两个时隙块(slot1和slot2),每两个时隙块是分布式,中间间隔Q个slot或时长为Ta的其它数据单元:
可选地,每个时隙内的数据可以是按照预设规则生成的非随机或随机序列。
在第一信号的信号类型为第一信号类型的情况下,第一信号的信号参数包括以下任意一项:
(1)第一时间单元的长度;即第一信号的信号参数包括上述Ts
(2)第二时间单元的长度;即第一信号的信号参数包括上述Ts
(3)第一时间单元与第二时间单元的长度和;即第一信号的信号参数包括2Ts
在第一信号的信号类型为第二信号类型的情况下,第一信号的信号参数包括以下任意一项:
(1)第一时间单元的长度,以及第三时间单元的长度;即第一信号的信号参数包括上述Ts和Ta
(2)第二时间单元的长度,以及第三时间单元的长度;即第一信号的信号参数包括上述Ts和Ta(第一时间单元和第二时间单元的长度都是Ts)。
(3)第一时间单元的长度,以及第一时间单元与第三时间单元的长度和;即第一信号的信号参数包括上述Ts和Ts+Ta
(4)第一时间单元的长度,以及第二时间单元与第三时间单元的长度和;即第一信号的信号参数包括上述Ts和Ts+Ta
(5)第二时间单元的长度,以及第一时间单元与第三时间单元的长度和;即第一信号的信号参数包括上述Ts和Ts+Ta
(6)第二时间单元的长度,以及第二时间单元与第三时间单元的长度和。即第一信号的信号参数包括上述Ts和Ts+Ta
通过上述第一信号的信号类型和第一信号的信号参数即可明确第一信号的信号格式,以及第一信号中各时间单元的长度。
在一种具体的实施方式中,上述第一信息包括:由第四通信设备配置或指示的第一指示信息,第四通信设备为第一通信设备、第二通信设备、第三通信设备中的任意一项,或者第四通信设备为第三方通信设备;
其中,所述第一指示信息用于指示所述第一信号的信号类型和信号参数。
上述第三通信设备具体可以是BSC系统中的BSC接收端。
在本申请实施例中,通过一个第四通信设备配置或指示具体的第一信号的信号类型和信号参数,具体地,该第四通信设备可以是为第一通信设备、第二通信设备、第三通信设备中的任意一项,也即由BSC系统中的射频源、BSC发送端和BSC接收端中的任意一者来实现配置或指示具体的第一信号的信号类型和信号参数,或者,第四通信设备也可以是第三方通信设备,即通过单独在设置一个第四通信设备来统一配置第一信号的信号类型和信号参数。
在一种具体的实施方式中,在第一信息包括:由第四通信设备配置或指示的第一指示信息,且第四通信设备不为第一通信设备的情况下,在第一通信设备根据第一信息确定第一信号之前,方法还包括:
第一通信设备接收第一信息;
其中,第一信息由第四通信设备通过无线资源控制(Radio Resource Control,RRC)信令、介质访问控制单元(Media Access Control Element,MAC CE)、下行链路控制信息(Downlink Control Information,DCI)、旁链路控制信息(Sidelink Control Information, SCI)以及前导序列中的至少一项配置或指示。
在本申请实施例中,对于第四通信设备与第一通信设备不是同一个设备(第三通信设备或第三方通信设备)的情况下,第一信息通过RRC信令、MAC CE、DCI、SCI以及前导序列中的至少一项承载。
在一种具体的实施方式中,方法还包括:
在第一通信设备与第三通信设备为不同设备的情况下,第一通信设备向第二通信设备以及第三通信设备发送第二指示信息;
在第一通信设备与第三通信设备为同一个设备的情况下,第一通信设备向第二通信设备发送第二指示信息;
其中,第二指示信息用于指示第一信号的信号类型和信号参数,和/或,第二信号的信号调制类型和信号调制参数。
上述第二信号是第二通信设备对第一信号进行幅度维度和/或相位维度差分调制时所使用的基带信号;
在本申请实施例中,可以由第一通信设备为第二通信设备以及第三通信设备指示第一信号的信号类型和信号参数,和/或,第二信号的信号调制类型和信号调制参数,即通过射频源向BSC发送端和BSC接收端指示射频信号的信号类型和信号参数,或者是直接将后续BSC发送端对射频信号进行调制所使用的基带信号的调制类型和信号调制参数指示给BSC发送端和BSC接收端。
具体地,第一通信设备与第三通信设备为不同设备的情况对应双基地反向散射通信系统,第一通信设备向第二通信设备以及第三通信设备发送用于指示第一信号的信号类型和信号参数的第二指示信息,对应于射频源向BSC发送端和BSC接收端发送射频信号的信号类型和信号参数,和/或基带信号的调制类型和信号调制参数;
第一通信设备与第三通信设备为同一个设备的情况对应单基地反向散射通信系统,第一通信设备向第二通信设备发送用于指示第一信号的信号类型和信号参数的第二指示信息,对应于射频源向BSC发送端发送射频信号的信号类型和信号参数,和/或基带信号的调制类型和信号调制参数;
在一种具体的实施方式中,第二信号的信号调制类型包括以下任意一项:
(1)第一调制类型,第一调制类型为对第一信号进行幅度差分调制的调制类型;
(2)第二调制类型,第二调制类型为对第一信号进行相位差分调制的调制类型;
(3)第三调制类型,第三调制类型为对第一信号进行幅度和相位差分调制的调制类型;
第二信号的信号调制参数包括以下一项或者多项:
(1)第二信号的一个或多个符号周期长度;
(2)第二信号的半符号周期长度;
(3)第二信号的调制阶数,例如2阶或4阶。
通过上述第二信号的信号类型和第二信号的信号参数即可明确第二通信设备对第一信号进行幅度维度和/或相位维度差分调制时所使用的基带信号,例如具体是针对幅度维度和/或相位维度进行调制,以及具体的调制阶数等。
表1给出了一种具体实施示例,即用指示比特来指示第二通信设备所使用的调制方式:
表1
在一种具体的实施方式中,第一通信设备发送第二指示信息,包括:
第一通信设备通过RRC信令、MAC CE、DCI、SCI以及前导序列中的至少一项发送第二指示信息。
其中,第二指示信息用于指示第一信号的信号类型和信号参数,和/或,第二信号的信号调制类型和信号调制参数。
参见图9,本申请实施例提供一种反向散射通信方法,该方法的执行主体为第二通信设备,在一些应用场景中,该第二通信设备具体可以是BSC系统中的BSC发送端,用于为对射频源提供的射频载波信号进行反向散射调制,并向BSC接收端发送调制后的反向散射信号;
该方法,包括:
步骤901:第二通信设备接收第一通信设备发送的第一信号;
步骤902:第二通信设备根据第二信息确定第二信号;
步骤903:第二通信设备根据第二信号对第一信号进行调制,生成第三信号;
步骤904:第二通信设备向第三通信设备发送第三信号;
其中,第一信号包括第一部分和第二部分,第一部分占用第一时间单元的长度,第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,第一时间单元中的数据与第二时间单元中的数据相同,第二信号是第二通信设备对第一信号进行幅度维度和/或相位维度差分调制时所使用的基带信号。
在本申请实施例中,第一通信设备发出的第一信号包括占用第一时间单元的长度的第一部分和占用第二时间单元的长度的第二部分,第一时间单元的长度和第二时间单元的长度相同,第一时间单元中的数据与第二时间单元中的数据相同,即第一信号具有重复时域结构。后续由第二通信设备根据第二信号对第一信号进行幅度维度和/或相位维度差分调制,得到第三信号,第三通信设备对根据第二信号的信号调制类型和信号调制参数从第三信号中解调制出第二信号的比特信息。这样,一方面利用第一信号的重复时域结构来消除链路干扰;一方面利用幅度维度和/或相位维度差分调制来提升信号的调制和解调制性能, 或利用幅度维度和/或相位维度差分调制来提升系统的频带利用率提升基带信号的速率,通过幅度维度和/或相位维度差分调制完成链路干扰消除和调制信号解调。
针对第一信号的说明具体可以参见第一通信设备侧方法中的相关描述,在此不再赘述。
BSC发送端接收射频源发送的射频载波信号,估计由射频源到BSC发送端的信道时延和时延扩展,并且以该时延为起点发送经过BSC基带信号调制之后的反向散射调制信号。
在一种具体的实施方式中,第二通信设备根据第二信号对第一信号进行调制,包括:
(1)在第二通信设备根据第二信号对第一信号进行幅度差分调制,且调制阶数为二阶的情况下,第二信号通过前半个符号周期与后半个符号周期的幅度差分值携带比特信息,且比特信息为第一值时,第二信号的幅度值为第一幅度值;比特信息为第二值时,第二信号的前半个符号周期的幅度值为第二幅度值,第二信号的后半个符号周期的幅度值为第三幅度值,第二幅度值和第三幅度值为互不相同的幅度值;
本申请实施例对应的是BSC发送端采用2阶差分幅度调制的调制方法;可选地,比特信息为第一值可以对应比特信息B=0的情况,比特信息为第二值可以对应比特信息B=1的情况。或者,比特信息为第一值可以对应比特信息B=1的情况,比特信息为第二值可以对应比特信息B=0的情况。
(2)在第二通信设备根据第二信号对第一信号进行相位差分调制,且调制阶数为二阶的情况下,第二信号通过前半个符号周期与后半个符号周期的相位差分值携带比特信息,且比特信息为第一值时,第二信号的相位值为第一相位值;比特信息为第二值时,第二信号的前半个符号周期的相位值为第二相位值,第二信号的后半个符号周期的幅度值为第三相位值,第二相位值和第三相位值为互不相同的相位值;
本申请实施例对应的是BSC发送端采用2阶相位幅度调制的调制方法;可选地,比特信息第一值可以对应比特信息B=0的情况,比特信息为第二值可以对应比特信息B=1的情况。或者,比特信息为第一值可以对应比特信息B=1的情况,比特信息为第二值可以对应比特信息B=0的情况。
(3)在第二通信设备根据第二信号对第一信号进行幅度和相位差分调制,且调制阶数为二阶的情况下,第二信号通过前半个符号周期与后半个符号周期的幅度和相位差分值携带比特信息,且比特信息为第一值时,第二信号的幅度值为第一幅度值,第二信号的相位值为第一相位值;比特信息为第二值时,第二信号的前半个符号周期的幅度值为第二幅度值,第二信号的前半个符号周期的相位值为第二相位值,第二信号的后半个符号周期的幅度值为第三幅度值,第二信号的后半个符号周期的相位值为第三相位值,第二幅度值和第三幅度值为互不相同的幅度值,第二相位值和第三相位值为互不相同的相位值;
本申请实施例对应的是BSC发送端采用2阶差分幅度-相位调制的调制方法;可选地,比特信息为第一值可以对应比特信息B=0的情况,比特信息为第二值可以对应比特信息B=1的情况。或者,比特信息为第一值可以对应比特信息B=1的情况,比特信息为第二值 可以对应比特信息B=0的情况。
(4)在第二通信设备根据第二信号对第一信号进行幅度和相位差分调制,且调制阶数为四阶的情况下,第二信号通过前半个符号周期与后半个符号周期的幅度和相位差分值携带比特信息,且比特信息为第一值时,第二信号的前半个符号周期的幅度值为第一幅度值,第二信号的前半个符号周期的相位值为第一相位值,第二信号的后半个符号周期的幅度值为第二幅度值,第二信号的后半个符号周期的相位值为第二相位值,比特信息为第二值时,第二信号的前半个符号周期的幅度值为第三幅度值,第二信号的前半个符号周期的相位值为第三相位值,第二信号的后半个符号周期的幅度值为第四幅度值,第二信号的后半个符号周期的相位值为第四相位值,比特信息为第三值时,第二信号的前半个符号周期的幅度值为第五幅度值,第二信号的前半个符号周期的相位值为第五相位值,第二信号的后半个符号周期的幅度值为第六幅度值,第二信号的后半个符号周期的相位值为第六相位值,比特信息为第四值时,第二信号的前半个符号周期的幅度值为第七幅度值,第二信号的前半个符号周期的相位值为第七相位值,第二信号的后半个符号周期的幅度值为第八幅度值,第二信号的后半个符号周期的相位值为第八相位值,所述第二幅度值与所述第一幅度值的差值、所述第四幅度值与所述第三幅度值的差值、所述第六幅度值与所述第五幅度值的差值、所述第八幅度值与所述第七幅度值的差值为互不相同的幅度值,所述第二相位值与所述第一相位值的差值、所述第四相位值与所述第三相位值的差值、所述第六相位值与所述第五相位值的差值、所述第八相位值与所述第七相位值的差值为互不相同的相位值。
本申请实施例对应的是BSC发送端采用4阶差分幅度-相位调制的调制方法;可选地,比特信息为第一值可以对应比特信息B=00的情况,比特信息为第二值可以对应比特信息B=01的情况。比特信息为第三值可以对应比特信息B=11的情况,比特信息为第四值可以对应比特信息B=10的情况。
需要说明的是,上述第一值、第二值,第三值,第四值对应的比特信息的值仅为举例,实际上第一值、第二值,第三值,第四值可以为比特00,01,10,11其中的某一项,且彼此互不相同的一项。
在根据调制方法确定出对应的BSC基带信号b(t)之后,以BSC基带信号b(t)与射频载波信号s(t)相乘,得到反向散射信号d(t),并发送该信号:
d(t)=α·b(t)·h1s(t);
其中,α为反向散射因子或反向散射系数,h1是射频源到反向散射发送设备的信道系数。
通过上述方法,实现第二通信设备对第一信号进行幅度维度和/或相位维度的差分调制。
进一步地,下面以二阶调制中的第一值为比特B=0,第一值为比特B=1为例;或者四阶调制中第一值为比特B=00,第二值为比特B=01,第三值为比特B=11,第四值为比特B=10为例,针对差分幅度-相位调制的调制方法描述如下:
联合幅度和相位维度来共同表示一个比特信息B,有:
(I)当第一信号为集中式分布时,所述第二信号b(t)为第一调制类型且调制阶数为2的信号并满足如下性质:
当B=0时,第二信号为:
当B=1时,BSC基带信号为:
其中,α,β,γ表示BSC基带信号的幅度,且α≠β,θ12和θ3表示信号的相位,且θ1≠θ2。BSC基带信号的周期为Tb=2Ts
(II)当第一信号为分布式分布时,所述第二信号b(t)为第二调制类型且调制阶数为2的信号并满足如下性质:
当B=0时,第二信号为:
当B=1时,第二信号为:
其中,α,β,γ表示第二信号的幅度,且α≠β,θ12和θ3表示信号的相位,且θ1≠θ2。第二信号的周期为Tb=2Ts+Ta
(3)分别利用幅度和相位维度表示不同的比特信息,有:
(I)当第一信号为集中式分布时,所述第二信号b(t)为第三调制类型且调制阶数为4的信号并满足如下性质:
当B=00时,第二信号为:
当B=01时,第二信号为:
当B=11时,第二信号为:
当B=10时,第二信号为:
其中,α1234,β,γ,κ,ξ表示第二信号的幅度,且(β-α1)≠(γ-α2)≠(κ-α3)≠(ξ-α4),θ12345678表示信号的相位,且(θ21)≠(θ43)≠(θ65)≠(θ87)。第二信号的周期为Tb=2Ts
(II)当第一信号为分布式分布时,所述第二信号b(t)为第三调制类型且调制阶数为4的信号并满足如下性质:
当B=00时,第二信号为:
当B=01时,第二信号为:
当B=11时,第二信号为:
当B=10时,第二信号为:
其中,α1234,β,γ,κ,ξ表示第二信号的幅度,且(β-α1)≠(γ-α2)≠(κ-α3)≠(ξ-α4),θ12345678表示信号的相位,且(θ21)≠(θ43)≠(θ65)≠(θ87)。第二信号的周期为Tb=2Ts
下面结合具体应用示例对上述各调制方法中的第二信号b(t)进行描述:
(1)2阶幅度差分调制;
以M=1,Q=0为例。
调制过程:
所述第二信号b(t)为第一调制类型且调制阶数为2的信号,并满足如下性质:
当B=0时,第二信号为:
当B=1时,第二信号为:
其中,α,β,γ表示第二信号的幅度,且α≠β,θ12和θ3表示信号的相位,且θ1≠θ2。第二信号的周期为Tb=2Ts。不失一般性,此时可以取α=1,β=2,γ=1,θ3=0,θ1=0,θ2=0,其基带信号可表示为:
当B=0时,第二信号为:
b[n]=ej0,n=0,1,…,2N-1;
当B=1时,第二信号为:
(2)2阶相位差分调制;
以M=1,Q=0为例。
调制过程:
所述第二信号b(t)为第二调制类型且调制阶数为2的信号,并满足如下性质:
当B=0时,第二信号为:
当B=1时,第二信号为:
其中,α,β,γ表示第二信号的幅度,且α≠β,θ12和θ3表示信号的相位,且θ1≠θ2。第二信号的周期为Tb=2Ts。不失一般性,此时可以取α=β=γ=1,θ3=0,其基带信号可表示为:
当B=0时,第二信号为:
b[n]=0,n=0,1,…,2N-1;
当B=1时,第二信号为:
(3)2阶幅度-相位差分调制;
以M=1,Q=0为例。
调制过程:
所述第二信号b(t)为第三调制类型且调制阶数为2的信号,并满足如下性质:
当B=0时,第二信号为:
当B=1时,第二信号为:
其中,α,β,γ表示第二信号的幅度,且α≠β,θ12和θ3表示信号的相位,且θ1≠θ2。第二信号的周期为Tb=2Ts。不失一般性,此时可以取β=γ=1,α=2, 其基带信号可表示为:
当B=0时,第二信号为:
b[n]=ejπ/2,n=0,1,…,2N-1;
当B=1时,第二信号为:
(4)4阶幅度-相位差分调制;
以M=1,Q=0为例。
调制过程:
所述第二信号b(t)为第三调制类型信号且调制阶数为4,并满足如下性质:
当B=00时,第二信号为:
当B=01时,第二信号为:
当B=11时,第二信号为:
当B=10时,第二信号为:
其中,α1234,β,γ,κ,ξ表示第二信号的幅度,且(β-α1)≠(γ-α2)≠(κ-α3)≠(ξ-α4),θ12345678表示信号的相位,且(θ21)≠(θ43)≠(θ65)≠(θ87)。第二信号的周期为Tb=2Ts。不失一般性,取α1=α2=α3=α4=1,β=2,γ=3,κ=4,ξ=5,
在一种具体的实施方式中,第二信息包括:由第一通信设备指示的第二指示信息;
或者,第二信息包括:由第四通信设备配置或指示的第三指示信息,第四通信设备为第一通信设备、第二通信设备、第三通信设备中的任意一项,或者第四通信设备为第三方通信设备;
其中,第二指示信息用于指示第一信号的信号类型和信号参数,和/或,第二信号的信号调制类型和信号调制参数,第三指示信息用于指示第一信号的信号类型和信号参数,和/或,第二信号的信号调制类型和信号调制参数。
在本申请实施例中,可以由第一通信设备为第二通信设备指示第一信号的信号类型和信号参数,和/或,第二信号的信号调制类型和信号调制参数,或者由第四通信设备为第二通信设备配置或指示第一信号的信号类型和信号参数,和/或,第二信号的信号调制类型和信号调制参数。也即,关于第一信号的信号类型和信号参数,和/或,第二信号的信号调制类型和信号调制参数,可以是在第一通信设备、第二通信设备、第三通信设备内部互相指示,也可以是由第三方通信设备统一配置或指示。
在一种具体的实施方式中,在第二信息包括:由第一通信设备指示的第二指示信息,或者第二信息包括:由第四通信设备配置或指示的第三指示信息,且第四通信设备不为第二通信设备的情况下,在第二通信设备根据第二信息确定第二信号之前,方法还包括:
第二通信设备接收第二信息;
其中,第二信息通过RRC信令、MAC CE、DCI、SCI以及前导序列中的至少一种方式指示。
在一种具体的实施方式中,方法还包括:
第二通信设备通过RRC信令、MAC CE、DCI、SCI以及前导序列中的至少一项向第三通信设备发送第四指示信息;
其中,第四指示信息用于指示第二信号的信号调制类型和信号调制参数。
在本申请实施例中,第二通信设备将第二信号的信号调制类型和信号调制参数指示给 第三通信设备,实现BSC发送端将自身使用的基带信号的信号调制类型和信号调制参数提供给BSC接收端,以便BSC接收端进行解调。
在一种具体的实施方式中,第一信号的信号类型包括以下任意一项:
(1)第一信号类型,第一信号类型的第一信号包括第一部分和第二部分;
(2)第二信号类型,第二信号类型的第一信号包括第一部分、第二部分和第三部分,第三部分位于第一部分和第二部分之间,第三部分占用第三时间单元的长度;
在第一信号的信号类型为第一信号类型的情况下,第一信号的信号参数包括以下任意一项:
(1)第一时间单元的长度;
(2)第二时间单元的长度;
(3)第一时间单元与第二时间单元的长度和;
在第一信号的信号类型为第二信号类型的情况下,第一信号的信号参数包括以下任意一项:
(1)第一时间单元的长度,以及第三时间单元的长度;
(2)第二时间单元的长度,以及第三时间单元的长度;
(3)第一时间单元的长度,以及第一时间单元与第三时间单元的长度和;
(4)第一时间单元的长度,以及第二时间单元与第三时间单元的长度和;
(5)第二时间单元的长度,以及第一时间单元与第三时间单元的长度和;
(6)第二时间单元的长度,以及第二时间单元与第三时间单元的长度和。
在一种具体的实施方式中,第二信号的信号调制类型包括以下任意一项:
(1)第一调制类型,第一调制类型为对第一信号进行幅度差分调制的调制类型;
(2)第二调制类型,第二调制类型为对第一信号进行相位差分调制的调制类型;
(3)第三调制类型,第三调制类型为对第一信号进行幅度和相位差分调制的调制类型;
第二信号的信号调制参数包括以下一项或者多项:
(1)第二信号的一个或多个符号周期长度;
(2)第二信号的半符号周期长度;
(3)第二信号的调制阶数。
参见图10,本申请实施例提供一种反向散射通信方法,该方法的执行主体为第三通信设备,在一些应用场景中,该第三通信设备具体可以是BSC系统中的BSC接收端,用于接收BSC发送端发送的调制信号,并进行解调;
该方法,包括:
步骤1001:第三通信设备接收第二通信设备发送的第三信号;
步骤1002:第三通信设备根据第三信息确定第二信号的信号调制类型和信号调制参数;
步骤1003:第三通信设备根据第二信号的信号调制类型和信号调制参数从第三信号中解调制出第二信号调制的比特信息;
其中,第三信号是第二通信设备根据第二信号对第一通信设备发送的第一信号进行调制生成的反向散射信号,第二信号是第二通信设备对第一信号进行幅度维度和/或相位维度差分调制时所使用的基带信号,第一信号包括第一部分和第二部分,第一部分占用第一时间单元的长度,第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,第一时间单元中的数据与第二时间单元中的数据相同。
在本申请实施例中,第一通信设备发出的第一信号包括占用第一时间单元的长度的第一部分和占用第二时间单元的长度的第二部分,所述第一时间单元的长度和所述第二时间单元的长度相同,第一时间单元中的数据与第二时间单元中的数据相同,即第一信号具有重复时域结构。后续由第二通信设备根据第二信号对第一信号进行幅度维度和/或相位维度差分调制,得到第三信号,第三通信设备对根据第二信号的信号调制类型和信号调制参数从第三信号中解调制出第二信号的比特信息。这样,一方面利用第一信号的重复时域结构来消除链路干扰;一方面利用幅度维度和/或相位维度差分调制来提升信号的调制和解调制性能,或利用幅度维度和/或相位维度差分调制来提升系统的频带利用率提升基带信号的速率,通过幅度维度和/或相位维度差分调制完成链路干扰消除和调制信号解调。
在一种具体的实施方式中,第三信息包括:由第一通信设备指示的第二指示信息;
或者,第三信息包括:由第二通信设备指示的第四指示信息;
或者,第三信息包括:由第四通信设备配置或指示第五指示信息,第四通信设备为第一通信设备、第二通信设备、第三通信设备中的任意一项,或者第四通信设备为第三方通信设备;
其中,第二指示信息用于指示第二信号的信号调制类型和信号调制参数,第四指示信息用于指示第二信号的信号调制类型和信号调制参数,第五指示信息用于指示第二信号的信号调制类型和信号调制参数。
在一种具体的实施方式中,在第三信息包括:由第一通信设备指示的第二指示信息,或第三信息包括:由第二通信设备指示的第四指示信息,或第三信息包括:由第四通信设备配置或指示的第五指示信息,且第四通信设备不为第三通信设备的情况下,方法还包括:
第三通信设备接收第三信息;
其中,第三信息通过RRC信令、MAC CE、DCI、SCI以及前导序列中的至少一种方式配置或指示。
在一种具体的实施方式中,第一信号的信号类型包括以下任意一项:
(1)第一信号类型,第一信号类型的第一信号包括第一部分和第二部分;
(2)第二信号类型,第二信号类型的第一信号包括第一部分、第二部分和第三部分,第三部分位于第一部分和第二部分之间,第三部分占用第三时间单元的长度;
在第一信号的信号类型为第一信号类型的情况下,第一信号的信号参数包括以下任意 一项:
(1)第一时间单元的长度;
(2)第二时间单元的长度;
(3)第一时间单元与第二时间单元的长度和;
在第一信号的信号类型为第二信号类型的情况下,第一信号的信号参数包括以下任意一项:
(1)第一时间单元的长度,以及第三时间单元的长度;
(2)第二时间单元的长度,以及第三时间单元的长度;
(3)第一时间单元的长度,以及第一时间单元与第三时间单元的长度和;
(4)第一时间单元的长度,以及第二时间单元与第三时间单元的长度和;
(5)第二时间单元的长度,以及第一时间单元与第三时间单元的长度和;
(6)第二时间单元的长度,以及第二时间单元与第三时间单元的长度和。
在一种具体的实施方式中,第二信号的信号调制类型包括以下任意一项:
(1)第一调制类型,第一调制类型为对第一信号进行幅度差分调制的调制类型;
(2)第二调制类型,第二调制类型为对第一信号进行相位差分调制的调制类型;
(3)第三调制类型,第三调制类型为对第一信号进行幅度和相位差分调制的调制类型;
第二信号的信号调制参数包括以下一项或者多项:
(1)第二信号的一个或多个符号周期长度;
(2)第二信号的半符号周期长度;
(3)第二信号的调制阶数。
在一种具体的实施方式中,第三通信设备根据第二信号的信号调制类型和信号调制参数从第三信号中解调制出第二信号调制的比特信息,包括:
第三通信设备将第三信号的一个符号周期中的前半个符号周期的信号与后半个符号周期的信号相减,得到差分信号;这样通过前半个符号周期的信号与后半个符号周期的信号相减,能够将跨链路干扰或直接链路干扰减掉,消除链路干扰。
需要说明的是,两个信号相减具体可以是前半个符号周期的信号减去后半个符号周期的信号,也可以是后半个符号周期的信号减去前半个符号周期的信号。为方便起见,后文在进行具体实施例的描述时按照前半个符号周期的信号减去后半个符号周期的信号为例进行说明。
第三通信设备根据差分信号,解调制出第二信号携带的比特信息。
在一种具体的实施方式中,第三通信设备根据差分信号,解调制出第二信号的比特信息,包括:
第三通信设备通过判决函数和所述差分信号,获得差分信号的判决值;
第三通信设备根据与判决值最接近的判决阈值,解调出第二信号携带的比特信息。需 要说明的是,对应不同的比特信息可以设置不同的判决阈值,例如针对4阶幅度-相位差分调制的信号,其对应比特信息可以包括00,01,11,10,分别对应00,01,11,10设置的最优判决阈值然后根据与差分信号的判决值最接近的判决阈值,解调出第二信号携带的比特信息。例如差分信号的判决值最接近的判决阈值为则可以确定由该差分信号解调出的第二信号携带的比特信息为00;
可以理解的是,上述仅为举例说明,在实际应用场景中判决阈值与比特信息的对应关系可以根据需求灵活调整。
例如:
当重复结构的长度为N时,构建如下差分信号,得到:
其中y0[n]=yb0[n]+yd0[n]+w0[n]为BSC接收设备的接收信号,D为最小信道时延,L为最大时延扩展,

v0[n]=w0[n]-w0[n+N];
则反向散射信号的有效SNR为:


所构建的统计判决函数为:
根据推导,最优判决阈值性能为:
其中,





Γ(·)为Gamma函数。
需要说明的是,上述举例仅为说明构建判决函数和判决阈值以解调出携带的比特信息的方法,在具体实施场景中,可以根据需求选择合适的判决函数和判决阈值,并不局限于 上述举例。
进一步地,针对从第三信号中解调制出第二信号调制的比特信息的描述如下:
接收BSC发送设备发送的信号以及射频源发送的信号,表示为:
y(t)=αs(t-τ2)b(t)h1h2+h3s(t-τ3)+w(t);
其中,第一项α·s(t-τ2)b(t)h1h2是从BSC发送设备发送的有用反向散射信号,第二项h3s(t-τ3)是从射频源发送的直接链路干扰信号,w(t)是高斯噪声部分,τ3和τ2分别是直接链路和反向散射级联链路的多径时延且有τ23,并且定义τ=max{τ23};
(2)接收端进行同步之后,根据指示信息(可以是来自射频源、发送端或者第三方通信设备)确定第二信号的调制和解调制规则后,按照如下规则进行解调:
(a)根据指示信息知道射频信号为集中式信号格式信号且BSC调制信号为第一调制类型且调制阶数为2的信号时,则BSC接收设备以Ts/MN的采样率对接收信号进行2MN次的采样,得到周期为2Ts的信号(以M=1为例,则为2N长的信号)
(I)基于差分信号结构,将接收到的信号的后Ts周期的信号减去前Ts周期的信号,得到差分信号为:
z(n)=y[n]-y[n+N],n=0,…,N-1;
根据Tb=2Ts的关系以及差分性质可知,跨链路干扰或直接链路干扰被减掉,并且得到反向散射信号的差分信号如下:
其中n=0,…,N-1。从上式可以看出,由于源信号的重复时域结构以及BSC基带信号采用了差分结构,直接链路干扰项被有效的消除了。同时通过差分信号的不同结果能够分别表征出两个不同的比特信息。
(II)根据预先得到的最优判决阈值进行最优判决,完成解调
其中是计算出的最优判决阈值。
(b)根据指示信息知道射频信号为分布式信号格式信号且BSC调制信号为第二调制类型且调制阶数为2的信号时,则BSC接收设备以(2Ts+Ta)/M(2N+Q)的采样率对接收信号进行M(2N+Q)次的采样,得到周期为2Ts+Ta的信号(以M=1为例,则为2N+Q长的信号)
(I)基于差分信号结构,将接收到的信号的后周期的信号减去前周期的信号,得到差分信号为:
根据Tb=2Ts的关系以及差分性质可知,跨链路干扰或直接链路干扰被减掉,并且得到反向散射信号的差分信号如下:
其中从上式可以看出,由于源信号的重复时域结构以及BSC基带信号采用了差分结构,直接链路干扰项被有效的消除了。
(II)根据预先得到的最优判决阈值进行最优判决,完成解调:
其中是计算出的最优判决阈值。
(c)根据指示信息知道射频信号为集中式信号格式信号且BSC调制信号为第三调制类型且调制阶数为2的信号时,则BSC接收设备以Ts/MN的采样率对接收信号进行2MN次的采样,得到周期为2Ts的信号(以M=1为例,则为2N长的信号)
(I)基于差分信号结构,将接收到的信号的后Ts周期的信号减去前Ts周期的信号,得到差分信号为:
z(n)=y[n]-y[n+N],n=0,…,N-1;
根据Tb=2Ts的关系以及差分性质可知,跨链路干扰或直接链路干扰被减掉,并且得到反向散射信号的差分信号如下:
当B=00时,
其中n=0,…,N-1。
当B=01时
其中n=0,…,N-1。
当B=11时,
其中n=0,…,N-1。
当B=01时
其中n=0,…,N-1。
从上式可以看出,由于源信号的重复时域结构以及BSC基带信号采用了差分结构,直接链路干扰项被有效的消除了。
(II)根据最大似然检测原则,并解调制得到比特信息。
其中分别是发送比特00,01,11,10时的最优判决阈值。
(d)根据指示信息知道射频信号为分布式信号格式信号且BSC调制信号为第三调制类型且调制阶数为4的信号时,则BSC接收设备以(2Ts+Ta)/M(2N+Q)的采样率对接 收信号进行M(2N+Q)次的采样,得到周期为2Ts+Ta的信号(以M=1为例,则为2N+Q长的信号)
(I)基于差分信号结构,将接收到的信号的后周期的信号减去前周期的信号,得到差分信号为:
根据Tb=2Ts的关系以及差分性质可知,跨链路干扰或直接链路干扰被减掉,并且得到反向散射信号的差分信号如下:
当B=00时,
其中
当B=01时
其中
当B=11时,
其中
当B=01时
其中
从上式可以看出,由于源信号的重复时域结构以及BSC基带信号采用了差分结构,直接链路干扰项被有效的消除了。
(II)根据最大似然检测原则,并解调制得到比特信息。
其中分别是发送比特00,01,11,10时的最优判决阈值。
下面结合具体应用示例,对BSC接收端根据BSC发送端使用的调制方法进行解调的过程进行描述:
示例一:二阶相位差分调制:
以M=1,Q=0为例,解释其调制过程和解调制过程。
调制过程:
所述BSC调制信号b(t)为第二调制类型且调制阶数为2的信号,并满足如下性质:
当B=0时,BSC基带信号为:
当B=1时,BSC基带信号为:
其中,α,β,γ表示第二信号的幅度,且α≠β,θ12和θ3表示信号的相位,且θ1≠θ2。BSC 基带信号的周期为Tb=2Ts。不失一般性,此时可以取α=β=γ=1,θ3=0,其基带信号可表示为:
当B=0时,BSC基带信号为:
b[n]=0,n=0,1,…,2N-1;
当B=1时,BSC基带信号为:
解调过程:
基于差分信号结构,将接收到的信号的后Ts周期的信号减去前Ts周期的信号,得到差分信号为:
z(n)=y[n]-y[n+N],n=0,…,N-1;
根据Tb=2Ts的关系以及差分性质可知,跨链路干扰或直接链路干扰被减掉,并且得到反向散射信号的差分信号如下:
其中n=0,…,N-1。从上式可以看出,由于源信号的重复时域结构以及BSC基带信号采用了差分结构,直接链路干扰项被有效的消除了。
根据预先得到的最优判决阈值进行最优判决,完成解调
其中是计算出的最优判决阈值。
相比于传统方案只在幅度维度进行调制,实施例一中只在相位维度进行信息调制和解调。根据相位调制恒包括性质,判决阈值收到SNR的影响较小,因而获得更好的调制和解调制性能。
示例二:二阶幅度-相位二维差分调制
以M=1,Q=0为例,解释其调制过程和解调制过程。
调制过程:
所述BSC调制信号b(t)为第三调制类型且调制阶数为2的信号,并满足如下性质:
当B=0时,BSC基带信号为:
当B=1时,BSC基带信号为:
其中,α,β,γ表示BSC基带信号的幅度,且α≠β,θ12和θ3表示信号的相位,且θ1≠θ2。BSC基带信号的周期为Tb=2Ts。不失一般性,此时可以取β=γ=1,α=2, 其基带信号可表示为:
当B=0时,BSC基带信号为:
b[n]=ejπ/2,n=0,1,…,2N-1;
当B=1时,BSC基带信号为:
解调过程:
基于差分信号结构,将接收到的信号的后Ts周期的信号减去前Ts周期的信号,得到差分信号为:
z(n)=y[n]-y[n+N],n=0,…,N-1;
根据Tb=2Ts的关系以及差分性质可知,跨链路干扰或直接链路干扰被减掉,并且得到反向散射信号的差分信号如下:
其中n=0,…,N-1。从上式可以看出,由于源信号的重复时域结构以及BSC基带信号采用了差分结构,直接链路干扰项被有效的消除了。
根据预先得到的最优判决阈值进行最优判决,完成解调
其中是计算出的最优判决阈值。
相比于传统方案只在幅度维度进行调制,实施例二中同时在幅度和相位维度进行信息调制和解调,从而在欧式空间上获得更大的星座点之间的距离,提升了调制和解调制性能。相比于实施例一,增加的幅度维度增加了两个星座点之间的间距,获得了更好的性能。
示例三:高阶幅度-相位二维差分调制
以M=1,Q=0为例,解释其调制过程和解调制过程。
调制过程:
所述BSC调制信号b(t)为第三调制类型且调制阶数为4的信号,并满足如下性质:
当B=00时,BSC基带信号为:
当B=01时,BSC基带信号为:
当B=11时,BSC基带信号为:
当B=10时,BSC基带信号为:
其中,α1234,β,γ,κ,ξ表示BSC基带信号的幅度,且(α1-β)≠(α2-γ)≠(α3-κ)≠(α4-ξ);θ12345677表示信号的相位,且(θ12)≠(θ34)≠(θ56)≠(θ78)。BSC基带信号的周期为Tb=2Ts。不失一般性,取α1=α2=α3=α4=1,β=2,γ=3,κ=4,ξ=5,
解调过程:
基于差分信号结构,将接收到的信号的后Ts周期的信号减去前Ts周期的信号,得到差分信号为:
z(n)=y[n]-y[n+N],n=0,…,N-1;
根据Tb=2Ts的关系以及差分性质可知,跨链路干扰或直接链路干扰被减掉,
当B=00时,
其中n=0,…,N-1。
当B=01时,
其中n=0,…,N-1。
当B=11时,
其中n=0,…,N-1。
当B=01时,
其中n=0,…,N-1。
从上式可以看出,由于源信号的重复时域结构以及BSC基带信号采用了差分结构,直接链路干扰项被有效的消除了。
根据最大似然检测原则,并解调制得到比特信息。
其中分别是发送比特00,01,11,10时的最优判决阈值。
相比于传统方案和实施例一、而只进行单比特调制,实施例三中同时在幅度和相位维度进行高阶信息调制和解调,有效的提升了系统的频带效率,提升了基带信号调制速率。
参见图11,本申请实施例提供一种反向散射通信方法,该方法的执行主体为第四通信设备,在一些应用场景中,该第四通信设备用于统一为BSC系统中的射频源、BSC发送端和BSC接收端进行统一配置;
该方法,包括:
步骤1101:包括以下一项或者多项:
第四通信设备向第一通信设备配置或指示第一信息;
第四通信设备向第二通信设备配置或指示第二信息;
第四通信设备向第三通信设备配置或指示第三信息;
其中,第一信息用于第一通信设备确定第一信号,第二信息用于第二通信设备确定第二信号,第三信息用于第三通信设备确定第二信号的信号调制类型和信号调制参数,第一信号包括第一部分和第二部分,第一部分占用第一时间单元的长度,第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,第一时间单元中的数据与第二时间单元中的数据相同,第二信号是第二通信设备对第一信号进行幅度维度和/或相位维度差分调制时所使用的基带信号。
在一种具体的实施方式中,
所述第一信息包括:由所述第四通信设备配置或指示的第一指示信息,所述第一指示信息用于指示所述第一信号的信号类型和信号参数;
所述第二信息包括:由所述第四通信设备配置或指示的第三指示信息,所述第三指示信息用于指示所述第二信号的信号调制类型和信号调制参数;
所述第三信息包括:由所述第四通信设备配置或指示的第五指示信息,所述第五指示信息用于指示所述第二信号的信号调制类型和信号调制参数。。
通过上述方法实现第四通信设备统一对第一通信设备、第二通信设备、第三通信设备的BSC通信进行配置,例如对第一通信设备其发送第一信号的信号类型和信号参数,对第二通信设备配置其进行信号调制是所使用的第二信号的信号调制类型和信号调制参数,对第三通信设备配置第二信号的信号调制类型和信号调制参数,使其获知第二通信设备使用的信号调制方式,这样第三通信设备能够使用相应的解调方式进行信号解调。
在一种具体的实施方式中,第一信号的信号类型包括以下任意一项:
(1)第一信号类型,第一信号类型的第一信号包括第一部分和第二部分;
(2)第二信号类型,第二信号类型的第一信号包括第一部分、第二部分和第三部分,第三部分位于第一部分和第二部分之间,第三部分占用第三时间单元的长度;
在第一信号的信号类型为第一信号类型的情况下,第一信号的信号参数包括以下任意一项:
(1)第一时间单元的长度;
(2)第二时间单元的长度;
(3)第一时间单元与第二时间单元的长度和;
在第一信号的信号类型为第二信号类型的情况下,第一信号的信号参数包括以下任意一项:
(1)第一时间单元的长度,以及第三时间单元的长度;
(2)第二时间单元的长度,以及第三时间单元的长度;
(3)第一时间单元的长度,以及第一时间单元与第三时间单元的长度和;
(4)第一时间单元的长度,以及第二时间单元与第三时间单元的长度和;
(5)第二时间单元的长度,以及第一时间单元与第三时间单元的长度和;
(6)第二时间单元的长度,以及第二时间单元与第三时间单元的长度和。
在一种具体的实施方式中,第二信号的信号调制类型包括以下任意一项:
(1)第一调制类型,第一调制类型为对第一信号进行幅度差分调制的调制类型;
(2)第二调制类型,第二调制类型为对第一信号进行相位差分调制的调制类型;
(3)第三调制类型,第三调制类型为对第一信号进行幅度和相位差分调制的调制类型;
第二信号的信号调制参数包括以下一项或者多项:
(1)第二信号的一个或多个符号周期长度;
(2)第二信号的半符号周期长度;
(3)第二信号的调制阶数。
在一种具体的实施方式中,
其中,第一信息、第二信息和/或第三信息通过RRC信令、MAC CE、DCI、SCI以及前导序列中的至少一种方式配置或指示。
本申请实施例提供的反向散射通信方法,执行主体可以为反向散射通信装置。本申请 实施例中以反向散射通信装置执行反向散射通信方法为例,说明本申请实施例提供的反向散射通信装置。
参见图12a,本申请实施例提供一种反向散射通信装置1210,该反向散射通信装置可以应用于上述第一通信设备中,执行上述第一通信设备的方法,该反向散射通信装置包括:
第一确定模块1211,用于根据第一信息确定第一信号;
第一发送模块1212,用于向第二通信设备发送第一信号;
其中,所述第一信号包括第一部分和第二部分,所述第一部分占用第一时间单元的长度,所述第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同。
在具体实施中,所述第一信息用于指示所述第一信号的信号类型和信号参数;
其中,所述第一信号的信号类型包括以下任意一项:
第一信号类型,所述第一信号类型的所述第一信号包括所述第一部分和所述第二部分;
第二信号类型,所述第二信号类型的所述第一信号包括所述第一部分、所述第二部分和第三部分,所述第三部分位于所述第一部分和所述第二部分之间,所述第三部分占用第三时间单元的长度;
在所述第一信号的信号类型为所述第一信号类型的情况下,所述第一信号的信号参数包括以下任意一项:
所述第一时间单元的长度;
所述第二时间单元的长度;
所述第一时间单元与所述第二时间单元的长度和;
在所述第一信号的信号类型为所述第二信号类型的情况下,所述第一信号的信号参数包括以下任意一项:
所述第一时间单元的长度,以及所述第三时间单元的长度;
所述第二时间单元的长度,以及所述第三时间单元的长度;
所述第一时间单元的长度,以及所述第一时间单元与所述第三时间单元的长度和;
所述第一时间单元的长度,以及所述第二时间单元与所述第三时间单元的长度和;
所述第二时间单元的长度,以及所述第一时间单元与所述第三时间单元的长度和;
所述第二时间单元的长度,以及所述第二时间单元与所述第三时间单元的长度和。
在具体实施中,所述第一信息包括:由第四通信设备配置或指示的第一指示信息,所述第四通信设备为所述反向散射通信装置、所述第二通信设备、第三通信设备中的任意一项,或者所述第四通信设备为第三方通信设备;
其中,所述第一指示信息用于指示所述第一信号的信号类型和信号参数。
在具体实施中,在所述第一信息包括:由所述第四通信设备配置或指示的第一指示信息,且所述第四通信设备不为所述反向散射通信装置的情况下,在所述反向散射通信装置根据第一信息确定第一信号之前,所述装置还包括:
第三接收模块,用于所述第一通信设备接收所述第一信息;
其中,所述第一信息由所述第四通信设备通过无线资源控制RRC信令、介质访问控制单元MAC CE、下行链路控制信息DCI、旁链路控制信息SCI以及前导序列中的至少一项配置或指示。
在具体实施中,所述装置还包括:
第三发送模块,用于:
在所述反向散射通信装置与所述第三通信设备为不同设备的情况下,向所述第二通信设备以及所述第三通信设备发送第二指示信息;
在所述反向散射通信装置与所述第三通信设备为同一个设备的情况下,向所述第二通信设备发送所述第二指示信息;
其中,所述第二指示信息用于指示所述第一信号的信号类型和信号参数,和/或,第二信号的信号调制类型和信号调制参数,所述第二信号是所述第二通信设备对所述第一信号进行幅度维度和/或相位维度差分调制时所使用的基带信号。
在具体实施中,所述第一信号的信号类型包括以下任意一项:
第一信号类型,所述第一信号类型的所述第一信号包括所述第一部分和所述第二部分;
第二信号类型,所述第二信号类型的所述第一信号包括所述第一部分、所述第二部分和第三部分,所述第三部分位于所述第一部分和所述第二部分之间,所述第三部分占用第三时间单元的长度;
在所述第一信号的信号类型为所述第一信号类型的情况下,所述第一信号的信号参数包括以下任意一项:
所述第一时间单元的长度;
所述第二时间单元的长度;
所述第一时间单元与所述第二时间单元的长度和;
在所述第一信号的信号类型为所述第二信号类型的情况下,所述第一信号的信号参数包括以下任意一项:
所述第一时间单元的长度,以及所述第三时间单元的长度;
所述第二时间单元的长度,以及所述第三时间单元的长度;
所述第一时间单元的长度,以及所述第一时间单元与所述第三时间单元的长度和;
所述第一时间单元的长度,以及所述第二时间单元与所述第三时间单元的长度和;
所述第二时间单元的长度,以及所述第一时间单元与所述第三时间单元的长度和;
所述第二时间单元的长度,以及所述第二时间单元与所述第三时间单元的长度和。
在具体实施中,所述第二信号的信号调制类型包括以下任意一项:
第一调制类型,所述第一调制类型为对所述第一信号进行幅度差分调制的调制类型;
第二调制类型,所述第二调制类型为对所述第一信号进行相位差分调制的调制类型;
第三调制类型,所述第三调制类型为对所述第一信号进行幅度和相位差分调制的调制 类型;
所述第二信号的信号调制参数包括以下一项或者多项:
所述第二信号的一个或多个符号周期长度;
所述第二信号的半符号周期长度;
所述第二信号的调制阶数。
在具体实施中,实施第三发送模块,用于:
通过RRC信令、MAC CE、DCI、SCI以及前导序列中的至少一项发送所述第二指示信息。
参见图12b,本申请实施例提供一种反向散射通信装置1220,该反向散射通信装置可以应用于上述第二通信设备中,执行上述第二通信设备的方法,该反向散射通信装置包括:
第一接收模块1221,用于接收第一通信设备发送的第一信号;
第二确定模块1222,用于根据第二信息确定第二信号;
调制模块1223,用于根据所述第二信号对所述第一信号进行反向散射调制,生成第三信号;
第二发送模块1224,用于向第三通信设备发送所述第三信号;
其中,所述第一信号包括第一部分和第二部分,所述第一部分占用第一时间单元的长度,所述第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同,所述第二信号是所述反向散射通信装置对所述第一信号进行幅度维度和/或相位维度差分调制时所使用的基带信号。
在具体实施中,所述调制模块,用于:
在根据所述第二信号对所述第一信号进行幅度差分调制,且调制阶数为二阶的情况下,所述第二信号通过前半个符号周期与后半个符号周期的幅度差分值携带比特信息,且比特信息为第一值时,所述第二信号的幅度值为第一幅度值;比特信息为第二值时,所述第二信号的前半个符号周期的幅度值为第二幅度值,所述第二信号的后半个符号周期的幅度值为第三幅度值,所述第二幅度值和所述第三幅度值为互不相同的幅度值;
在根据所述第二信号对所述第一信号进行相位差分调制,且调制阶数为二阶的情况下,所述第二信号通过前半个符号周期与后半个符号周期的相位差分值携带比特信息,且比特信息为第一值时,所述第二信号的相位值为第一相位值;比特信息为第二值时,所述第二信号的前半个符号周期的相位值为第二相位值,所述第二信号的后半个符号周期的幅度值为第三相位值,所述第二相位值和所述第三相位值为互不相同的相位值;
在根据所述第二信号对所述第一信号进行幅度和相位差分调制,且调制阶数为二阶的情况下,所述第二信号通过前半个符号周期与后半个符号周期的幅度和相位差分值携带比特信息,且比特信息为第一值时,所述第二信号的幅度值为第一幅度值,所述第二信号的相位值为第一相位值;比特信息为第二值时,所述第二信号的前半个符号周期的幅度值为 第二幅度值,所述第二信号的前半个符号周期的相位值为第二相位值,所述第二信号的后半个符号周期的幅度值为第三幅度值,所述第二信号的后半个符号周期的相位值为第三相位值,所述第二幅度值和所述第三幅度值为互不相同的幅度值,所述第二相位值和所述第三相位值为互不相同的相位值;
在根据所述第二信号对所述第一信号进行幅度和相位差分调制,且调制阶数为四阶的情况下,所述第二信号通过前半个符号周期与后半个符号周期的幅度和相位差分值携带比特信息,且比特信息为第一值时,所述第二信号的前半个符号周期的幅度值为第一幅度值,所述第二信号的前半个符号周期的相位值为第一相位值,所述第二信号的后半个符号周期的幅度值为第二幅度值,所述第二信号的后半个符号周期的相位值为第二相位值,比特信息为第二值时,所述第二信号的前半个符号周期的幅度值为第三幅度值,所述第二信号的前半个符号周期的相位值为第三相位值,所述第二信号的后半个符号周期的幅度值为第四幅度值,所述第二信号的后半个符号周期的相位值为第四相位值,比特信息为第三值时,所述第二信号的前半个符号周期的幅度值为第五幅度值,所述第二信号的前半个符号周期的相位值为第五相位值,所述第二信号的后半个符号周期的幅度值为第六幅度值,所述第二信号的后半个符号周期的相位值为第六相位值,比特信息为第四值时,所述第二信号的前半个符号周期的幅度值为第七幅度值,所述第二信号的前半个符号周期的相位值为第七相位值,所述第二信号的后半个符号周期的幅度值为第八幅度值,所述第二信号的后半个符号周期的相位值为第八相位值,所述第二幅度值与所述第一幅度值的差值、所述第四幅度值与所述第三幅度值的差值、所述第六幅度值与所述第五幅度值的差值、所述第八幅度值与所述第七幅度值的差值为互不相同的幅度值,所述第二相位值与所述第一相位值的差值、所述第四相位值与所述第三相位值的差值、所述第六相位值与所述第五相位值的差值、所述第八相位值与所述第七相位值的差值为互不相同的相位值。
在具体实施中,所述第二信息包括:由所述第一通信设备指示的第二指示信息;
或者,
所述第二信息包括:由第四通信设备配置或指示的第三指示信息,所述第四通信设备为所述第一通信设备、所述反向散射通信装置、第三通信设备中的任意一项,或者所述第四通信设备为第三方通信设备;
其中,所述第二指示信息用于指示所述第一信号的信号类型和信号参数,和/或,所述第二信号的信号调制类型和信号调制参数,所述第三指示信息用于指示所述第一信号的信号类型和信号参数,和/或,所述第二信号的信号调制类型和信号调制参数。
在具体实施中,在所述第二信息包括:由所述第一通信设备指示的第二指示信息,或者所述第二信息包括:由第四通信设备配置或指示的第三指示信息,且所述第四通信设备不为所述反向散射通信装置的情况下,在根据第二信息确定第二信号之前,所述装置还包括:
第四接收模块,用于接收所述第二信息;
其中,所述第二信息通过RRC信令、MAC CE、DCI、SCI以及前导序列中的至少一种方式指示。
在具体实施中,所述装置还包括:
第四发送模块,用于通过RRC信令、MAC CE、DCI、SCI以及前导序列中的至少一项向所述第三通信设备发送第四指示信息;
其中,所述第四指示信息用于指示所述第二信号的信号调制类型和信号调制参数。
在具体实施中,所述第一信号的信号类型包括以下任意一项:
第一信号类型,所述第一信号类型的所述第一信号包括所述第一部分和所述第二部分;
第二信号类型,所述第二信号类型的所述第一信号包括所述第一部分、所述第二部分和第三部分,所述第三部分位于所述第一部分和所述第二部分之间,所述第三部分占用第三时间单元的长度;
在所述第一信号的信号类型为所述第一信号类型的情况下,所述第一信号的信号参数包括以下任意一项:
所述第一时间单元的长度;
所述第二时间单元的长度;
所述第一时间单元与所述第二时间单元的长度和;
在所述第一信号的信号类型为所述第二信号类型的情况下,所述第一信号的信号参数包括以下任意一项:
所述第一时间单元的长度,以及所述第三时间单元的长度;
所述第二时间单元的长度,以及所述第三时间单元的长度;
所述第一时间单元的长度,以及所述第一时间单元与所述第三时间单元的长度和;
所述第一时间单元的长度,以及所述第二时间单元与所述第三时间单元的长度和;
所述第二时间单元的长度,以及所述第一时间单元与所述第三时间单元的长度和;
所述第二时间单元的长度,以及所述第二时间单元与所述第三时间单元的长度和。
在具体实施中,所述第二信号的信号调制类型包括以下任意一项:
第一调制类型,所述第一调制类型为对所述第一信号进行幅度差分调制的调制类型;
第二调制类型,所述第二调制类型为对所述第一信号进行相位差分调制的调制类型;
第三调制类型,所述第三调制类型为对所述第一信号进行幅度和相位差分调制的调制类型;
所述第二信号的信号调制参数包括以下一项或者多项:
所述第二信号的一个或多个符号周期长度;
所述第二信号的半符号周期长度;
所述第二信号的调制阶数。
参见图12c,本申请实施例提供一种反向散射通信装置1230,该反向散射通信装置可以应用于上述第三通信设备中,执行上述第三通信设备的方法,该反向散射通信装置包括:
第二接收模块1231,用于接收第二通信设备发送的第三信号;
第三确定模块1232,用于根据第三信息确定第二信号的信号调制类型和信号调制参数;
解调模块1233,用于根据所述第二信号的信号调制类型和信号调制参数从所述第三信号中解调制出第二信号的比特信息;
其中,所述第三信号是所述第二通信设备根据所述第二信号对第一通信设备发送的第一信号进行调制生成的信号,所述第二信号是所述第二通信设备对所述第一信号进行幅度维度和/或相位维度差分调制时所使用的基带信号,所述第一信号包括第一部分和第二部分,所述第一部分占用第一时间单元的长度,所述第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同。
在具体实施中,所述第三信息包括:由所述第一通信设备指示的第二指示信息;
或者,
所述第三信息包括:由所述第二通信设备指示的第四指示信息;
或者,
所述第三信息包括:由第四通信设备配置或指示第五指示信息,所述第四通信设备为所述第一通信设备、所述第二通信设备、所述反向散射通信装置中的任意一项,或者所述第四通信设备为第三方通信设备;
其中,所述第二指示信息用于指示所述第二信号的信号调制类型和信号调制参数,所述第四指示信息用于指示所述第二信号的信号调制类型和信号调制参数,所述第五指示信息用于指示所述第二信号的信号调制类型和信号调制参数。
在具体实施中,在所述第三信息包括:由所述第一通信设备指示的第二指示信息,或所述第三信息包括:由所述第二通信设备指示的第四指示信息,或所述第三信息包括:由所述第四通信设备配置或指示的第五指示信息,且所述第四通信设备不为所述反向散射通信装置的情况下,所述装置还包括:
第五接收模块,用于接收所述第三信息;
其中,所述第三信息通过RRC信令、MAC CE、DCI、SCI以及前导序列中的至少一种方式配置或指示。
在具体实施中,所述第一信号的信号类型包括以下任意一项:
第一信号类型,所述第一信号类型的所述第一信号包括所述第一部分和所述第二部分;
第二信号类型,所述第二信号类型的所述第一信号包括所述第一部分、所述第二部分和第三部分,所述第三部分位于所述第一部分和所述第二部分之间,所述第三部分占用第三时间单元的长度;
在所述第一信号的信号类型为所述第一信号类型的情况下,所述第一信号的信号参数包括以下任意一项:
所述第一时间单元的长度;
所述第二时间单元的长度;
所述第一时间单元与所述第二时间单元的长度和;
在所述第一信号的信号类型为所述第二信号类型的情况下,所述第一信号的信号参数包括以下任意一项:
所述第一时间单元的长度,以及所述第三时间单元的长度;
所述第二时间单元的长度,以及所述第三时间单元的长度;
所述第一时间单元的长度,以及所述第一时间单元与所述第三时间单元的长度和;
所述第一时间单元的长度,以及所述第二时间单元与所述第三时间单元的长度和;
所述第二时间单元的长度,以及所述第一时间单元与所述第三时间单元的长度和;
所述第二时间单元的长度,以及所述第二时间单元与所述第三时间单元的长度和。
在具体实施中,所述第二信号的信号调制类型包括以下任意一项:
第一调制类型,所述第一调制类型为对所述第一信号进行幅度差分调制的调制类型;
第二调制类型,所述第二调制类型为对所述第一信号进行相位差分调制的调制类型;
第三调制类型,所述第三调制类型为对所述第一信号进行幅度和相位差分调制的调制类型;
所述第二信号的信号调制参数包括以下一项或者多项:
所述第二信号的一个或多个符号周期长度;
所述第二信号的半符号周期长度;
所述第二信号的调制阶数。
在具体实施中,所述解调模块,用于:
将所述第三信号的一个符号周期中的前半个符号周期的信号与后半个符号周期的信号相减,得到差分信号;
根据所述差分信号,解调制出所述第二信号携带的比特信息。
在具体实施中,所述解调模块,用于:
通过所述判决函数和所述差分信号,获得所述差分信号的判决值;
根据与所述判决值最接近的所述判决阈值,解调出所述第二信号携带的比特信息。
参见图12d,本申请实施例提供一种反向散射通信装置1240,该反向散射通信装置可以应用于上述第四通信设备中,执行上述第四通信设备的方法,该反向散射通信装置包括:
配置模块1241,用于以下一项或者多项:
向第一通信设备配置或指示第一信息;
向第二通信设备配置或指示第二信息;
向第三通信设备配置或指示第三信息;
其中,所述第一信息用于所述第一通信设备确定第一信号,所述第二信息用于所述第二通信设备确定第二信号,所述第三信息用于所述第三通信设备确定所述第二信号的信号 调制类型和信号调制参数,所述第一信号包括第一部分和第二部分,所述第一部分占用第一时间单元的长度,所述第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同,所述第二信号是所述第二通信设备对所述第一信号进行幅度维度和/或相位维度差分调制时所使用的基带信号。
在具体实施中,
所述第一信息包括:由所述第四通信设备配置或指示的第一指示信息,所述第一指示信息用于指示所述第一信号的信号类型和信号参数;
所述第二信息包括:由所述第四通信设备配置或指示的第三指示信息,所述第三指示信息用于指示所述第二信号的信号调制类型和信号调制参数;
所述第三信息包括:由所述第四通信设备配置或指示的第五指示信息,所述第五指示信息用于指示所述第二信号的信号调制类型和信号调制参数。。
在具体实施中,所述第一信号的信号类型包括以下任意一项:
第一信号类型,所述第一信号类型的所述第一信号包括所述第一部分和所述第二部分;
第二信号类型,所述第二信号类型的所述第一信号包括所述第一部分、所述第二部分和第三部分,所述第三部分位于所述第一部分和所述第二部分之间,所述第三部分占用第三时间单元的长度;
在所述第一信号的信号类型为所述第一信号类型的情况下,所述第一信号的信号参数包括以下任意一项:
所述第一时间单元的长度;
所述第二时间单元的长度;
所述第一时间单元与所述第二时间单元的长度和;
在所述第一信号的信号类型为所述第二信号类型的情况下,所述第一信号的信号参数包括以下任意一项:
所述第一时间单元的长度,以及所述第三时间单元的长度;
所述第二时间单元的长度,以及所述第三时间单元的长度;
所述第一时间单元的长度,以及所述第一时间单元与所述第三时间单元的长度和;
所述第一时间单元的长度,以及所述第二时间单元与所述第三时间单元的长度和;
所述第二时间单元的长度,以及所述第一时间单元与所述第三时间单元的长度和;
所述第二时间单元的长度,以及所述第二时间单元与所述第三时间单元的长度和。
在具体实施中,所述第二信号的信号调制类型包括以下任意一项:
第一调制类型,所述第一调制类型为对所述第一信号进行幅度差分调制的调制类型;
第二调制类型,所述第二调制类型为对所述第一信号进行相位差分调制的调制类型;
第三调制类型,所述第三调制类型为对所述第一信号进行幅度和相位差分调制的调制类型;
所述第二信号的信号参数包括以下一项或者多项:
所述第二信号的一个或多个重复周期长度;
所述第二信号的半重复周期长度;
所述第二信号的调制阶数。
在具体实施中,其中,所述第一信息、所述第二信息和/或所述第三信息通过RRC信令、MAC CE、DCI、SCI以及前导序列中的至少一种方式配置或指示。
本申请实施例中的反向散射通信装置可以是电子设备,例如具有操作系统的电子设备,也可以是电子设备中的部件,例如集成电路或芯片。该电子设备可以是终端,也可以为除终端之外的其他设备。示例性的,终端可以包括但不限于上述所列举的终端11的类型,其他设备可以为服务器、网络附属存储器(Network Attached Storage,NAS)等,本申请实施例不作具体限定。
本申请实施例提供的反向散射通信装置能够实现图7至图11的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。
可选地,如图13所示,本申请实施例还提供一种通信设备1300,包括处理器1301和存储器1302,存储器1302上存储有可在所述处理器1301上运行的程序或指令,例如,该通信设备1300为终端时,该程序或指令被处理器1301执行时实现上述方法实施例的各个步骤,且能达到相同的技术效果。该通信设备1300为网络侧设备时,该程序或指令被处理器1301执行时实现上述反向散射通信方法实施例的各个步骤,且能达到相同的技术效果,为避免重复,这里不再赘述。
本申请实施例还提供一种通信设备,包括处理器和通信接口;
该通信设备作为上述第一通信设备使用时:
所述处理器,用于第一通信设备根据第一信息确定第一信号;
所述通信接口,用于所述第一通信设备向第二设备发送第一信号;
其中,所述第一信号包括第一部分和第二部分,所述第一部分占用第一时间单元的长度,所述第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同
该通信设备作为上述第二通信设备使用时:
所述通信接口,用于第二通信设备接收第一通信设备发送的第一信号;
所述处理器,用于所述第二通信设备根据第二信息确定第二信号;
所述处理器,用于所述第二通信设备根据所述第二信号对所述第一信号进行调制,生成第三信号;
所述通信接口,用于所述第二通信设备向第三通信设备发送所述第三信号;
其中,所述第一信号包括第一部分和第二部分,所述第一部分占用第一时间单元的长度,所述第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同,所述第二 信号是所述第二通信设备对所述第一信号进行幅度维度和/或相位维度差分调制时所使用的基带信号。
该通信设备作为上述第三通信设备使用时:
所述通信接口,用于第三通信设备接收第二通信设备发送的第三信号;
所述处理器,用于所述第三通信设备根据第三信息确定第二信号的信号调制类型和信号调制参数;
所述处理器,用于所述第三通信设备根据所述第二信号的信号调制类型和信号调制参数从所述第三信号中解调制出第二信号的比特信息;
其中,所述第三信号是所述第二通信设备根据所述第二信号对第一通信设备发送的第一信号进行反向散射调制生成的信号,所述第二信号是所述第二通信设备对所述第一信号进行幅度维度和/或相位维度差分调制时所使用的基带信号,所述第一信号包括第一部分和第二部分,所述第一部分占用第一时间单元的长度,所述第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同。
该通信设备作为上述第四通信设备使用时:
所述通信接口,用于:
所述第四通信设备向第一通信设备配置或指示第一信息;
所述第四通信设备向第二通信设备配置或指示第二信息;
所述第四通信设备向第三通信设备配置或指示第三信息;
其中,所述第一信息用于所述第一通信设备确定第一信号,所述第二信息用于所述第二通信设备确定第二信号,所述第三信息用于所述第三通信设备确定所述第二信号的信号调制类型和信号调制参数,所述第一信号包括第一部分和第二部分,所述第一部分占用第一时间单元的长度,所述第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同,所述第二信号是所述第二通信设备对所述第一信号进行幅度维度和/或相位维度差分调制时所使用的基带信号。
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反向散射通信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程序或指令,实现上述反向散射通信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。
本申请实施例另提供了一种计算机程序/程序产品,所述计算机程序/程序产品被存储在存储介质中,所述计算机程序/程序产品被至少一个处理器执行以实现上述反向散射通信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。
本申请实施例还提供了一种反向散射通信系统,包括:第一通信设备、第二通信设备、第三通信设备和第四通信设备,所述第一通信设备可用于执行如第一方面所述的反向散射通信方法的步骤,所述第二通信设备可用于执行如第二方面所述的反向散射通信方法的步骤,所述第三通信设备可用于执行如第三方面所述的反向散射通信方法的步骤,所述第四通信设备可用于执行如第四方面所述的反向散射通信方法的步骤。
在本申请实施例中,第四通信设备可以为第一通信设备、第二通信设备、第三通信设备中的任意一项,或者第四通信设备为第三方通信设备;可选地,第一通信设备和第三通信设备在实际应用场景中也可以合设为同一个硬件设备。
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相关技术做出贡献的部分可以以计算机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 (32)

  1. 一种反向散射通信方法,包括:
    第一通信设备根据第一信息确定第一信号;
    所述第一通信设备向第二通信设备发送所述第一信号;
    其中,所述第一信号包括第一部分和第二部分,所述第一部分占用第一时间单元的长度,所述第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同。
  2. 根据权利要求1所述的方法,其中,所述第一信息用于指示所述第一信号的信号类型和信号参数;
    其中,所述第一信号的信号类型包括以下任意一项:
    第一信号类型,所述第一信号类型的所述第一信号包括所述第一部分和所述第二部分;
    第二信号类型,所述第二信号类型的所述第一信号包括所述第一部分、所述第二部分和第三部分,所述第三部分位于所述第一部分和所述第二部分之间,所述第三部分占用第三时间单元的长度;
    在所述第一信号的信号类型为所述第一信号类型的情况下,所述第一信号的信号参数包括以下任意一项:
    所述第一时间单元的长度;
    所述第二时间单元的长度;
    所述第一时间单元与所述第二时间单元的长度和;
    在所述第一信号的信号类型为所述第二信号类型的情况下,所述第一信号的信号参数包括以下任意一项:
    所述第一时间单元的长度,以及所述第三时间单元的长度;
    所述第二时间单元的长度,以及所述第三时间单元的长度;
    所述第一时间单元的长度,以及所述第一时间单元与所述第三时间单元的长度和;
    所述第一时间单元的长度,以及所述第二时间单元与所述第三时间单元的长度和;
    所述第二时间单元的长度,以及所述第一时间单元与所述第三时间单元的长度和;
    所述第二时间单元的长度,以及所述第二时间单元与所述第三时间单元的长度和。
  3. 根据权利要求1所述的方法,其中,所述第一信息包括:由第四通信设备配置或指示的第一指示信息,所述第四通信设备为所述第一通信设备、所述第二通信设备、第三通信设备中的任意一项,或者所述第四通信设备为第三方通信设备;
    其中,所述第一指示信息用于指示所述第一信号的信号类型和信号参数。
  4. 根据权利要求3所述的方法,其中,在所述第一信息包括:由所述第四通信设备配置或指示的第一指示信息,且所述第四通信设备不为所述第一通信设备的情况下,在所述第一通信设备根据第一信息确定第一信号之前,所述方法还包括:
    所述第一通信设备接收所述第一信息;
    其中,所述第一信息由所述第四通信设备通过无线资源控制RRC信令、介质访问控制单元MAC CE、下行链路控制信息DCI、旁链路控制信息SCI以及前导序列中的至少一项配置或指示。
  5. 根据权利要求3所述的方法,所述方法还包括:
    在所述第一通信设备与所述第三通信设备为不同设备的情况下,所述第一通信设备向所述第二通信设备以及所述第三通信设备发送第二指示信息;
    在所述第一通信设备与所述第三通信设备为同一个设备的情况下,所述第一通信设备向所述第二通信设备发送所述第二指示信息;
    其中,所述第二指示信息用于指示所述第一信号的信号类型和信号参数,和/或,第二信号的信号调制类型和信号调制参数,所述第二信号是所述第二通信设备对所述第一信号进行幅度维度和/或相位维度差分调制时所使用的基带信号。
  6. 根据权利要求5所述的方法,其中,
    所述第二信号的信号调制类型包括以下任意一项:
    第一调制类型,所述第一调制类型为对所述第一信号进行幅度差分调制的调制类型;
    第二调制类型,所述第二调制类型为对所述第一信号进行相位差分调制的调制类型;
    第三调制类型,所述第三调制类型为对所述第一信号进行幅度和相位差分调制的调制类型;
    所述第二信号的信号调制参数包括以下一项或者多项:
    所述第二信号的一个或多个符号周期长度;
    所述第二信号的半符号周期长度;
    所述第二信号的调制阶数。
  7. 根据权利要求5所述的方法,其中,所述第一通信设备发送所述第二指示信息,包括:
    所述第一通信设备通过RRC信令、MAC CE、DCI、SCI以及前导序列中的至少一项发送所述第二指示信息。
  8. 一种反向散射通信方法,包括:
    第二通信设备接收第一通信设备发送的第一信号;
    所述第二通信设备根据第二信息确定第二信号;
    所述第二通信设备根据所述第二信号对所述第一信号进行调制,生成第三信号;
    所述第二通信设备向第三通信设备发送所述第三信号;
    其中,所述第一信号包括第一部分和第二部分,所述第一部分占用第一时间单元的长度,所述第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同,所述第二信号是所述第二通信设备对所述第一信号进行幅度维度和/或相位维度差分调制时所使用 的基带信号。
  9. 根据权利要求8所述的方法,其中,所述第二通信设备根据所述第二信号对所述第一信号进行调制,包括:
    在所述第二通信设备根据所述第二信号对所述第一信号进行幅度差分调制,且调制阶数为二阶的情况下,所述第二信号通过前半个符号周期与后半个符号周期的幅度差分值携带比特信息,且比特信息为第一值时,所述第二信号的幅度值为第一幅度值;比特信息为第二值时,所述第二信号的前半个符号周期的幅度值为第二幅度值,所述第二信号的后半个符号周期的幅度值为第三幅度值,所述第二幅度值和所述第三幅度值为互不相同的幅度值;
    在所述第二通信设备根据所述第二信号对所述第一信号进行相位差分调制,且调制阶数为二阶的情况下,所述第二信号通过前半个符号周期与后半个符号周期的相位差分值携带比特信息,且比特信息为第一值时,所述第二信号的相位值为第一相位值;比特信息为第二值时,所述第二信号的前半个符号周期的相位值为第二相位值,所述第二信号的后半个符号周期的幅度值为第三相位值,所述第二相位值和所述第三相位值为互不相同的相位值;
    在所述第二通信设备根据所述第二信号对所述第一信号进行幅度和相位差分调制,且调制阶数为二阶的情况下,所述第二信号通过前半个符号周期与后半个符号周期的幅度和相位差分值携带比特信息,且比特信息为第一值时,所述第二信号的幅度值为第一幅度值,所述第二信号的相位值为第一相位值;比特信息为第二值时,所述第二信号的前半个符号周期的幅度值为第二幅度值,所述第二信号的前半个符号周期的相位值为第二相位值,所述第二信号的后半个符号周期的幅度值为第三幅度值,所述第二信号的后半个符号周期的相位值为第三相位值,所述第二幅度值和所述第三幅度值为互不相同的幅度值,所述第二相位值和所述第三相位值为互不相同的相位值;
    在所述第二通信设备根据所述第二信号对所述第一信号进行幅度和相位差分调制,且调制阶数为四阶的情况下,所述第二信号通过前半个符号周期与后半个符号周期的幅度和相位差分值携带比特信息,且比特信息为第一值时,所述第二信号的前半个符号周期的幅度值为第一幅度值,所述第二信号的前半个符号周期的相位值为第一相位值,所述第二信号的后半个符号周期的幅度值为第二幅度值,所述第二信号的后半个符号周期的相位值为第二相位值,比特信息为第二值时,所述第二信号的前半个符号周期的幅度值为第三幅度值,所述第二信号的前半个符号周期的相位值为第三相位值,所述第二信号的后半个符号周期的幅度值为第四幅度值,所述第二信号的后半个符号周期的相位值为第四相位值,比特信息为第三值时,所述第二信号的前半个符号周期的幅度值为第五幅度值,所述第二信号的前半个符号周期的相位值为第五相位值,所述第二信号的后半个符号周期的幅度值为第六幅度值,所述第二信号的后半个符号周期的相位值为第六相位值,比特信息为第四值时,所述第二信号的前半个符号周期的幅度值为第七幅度值,所述第二信号的前半个符号 周期的相位值为第七相位值,所述第二信号的后半个符号周期的幅度值为第八幅度值,所述第二信号的后半个符号周期的相位值为第八相位值,所述第二幅度值与所述第一幅度值的差值、所述第四幅度值与所述第三幅度值的差值、所述第六幅度值与所述第五幅度值的差值、所述第八幅度值与所述第七幅度值的差值为互不相同的幅度值,所述第二相位值与所述第一相位值的差值、所述第四相位值与所述第三相位值的差值、所述第六相位值与所述第五相位值的差值、所述第八相位值与所述第七相位值的差值为互不相同的相位值。
  10. 根据权利要求8所述的方法,其中,
    所述第二信息包括:由所述第一通信设备指示的第二指示信息;
    或者,
    所述第二信息包括:由第四通信设备配置或指示的第三指示信息,所述第四通信设备为所述第一通信设备、所述第二通信设备、第三通信设备中的任意一项,或者所述第四通信设备为第三方通信设备;
    其中,所述第二指示信息用于指示所述第一信号的信号类型和信号参数,和/或,所述第二信号的信号调制类型和信号调制参数,所述第三指示信息用于指示所述第一信号的信号类型和信号参数,和/或,所述第二信号的信号调制类型和信号调制参数。
  11. 根据权利要求10所述的方法,其中,在所述第二信息包括:由所述第一通信设备指示的第二指示信息,或者所述第二信息包括:由第四通信设备配置或指示的第三指示信息,且所述第四通信设备不为所述第二通信设备的情况下,在所述第二通信设备根据第二信息确定第二信号之前,所述方法还包括:
    所述第二通信设备接收所述第二信息;
    其中,所述第二信息通过RRC信令、MAC CE、DCI、SCI以及前导序列中的至少一种方式指示。
  12. 根据权利要求8所述的方法,所述方法还包括:
    所述第二通信设备通过RRC信令、MAC CE、DCI、SCI以及前导序列中的至少一项向所述第三通信设备发送第四指示信息;
    其中,所述第四指示信息用于指示所述第二信号的信号调制类型和信号调制参数。
  13. 根据权利要求10所述的方法,其中,
    所述第一信号的信号类型包括以下任意一项:
    第一信号类型,所述第一信号类型的所述第一信号包括所述第一部分和所述第二部分;
    第二信号类型,所述第二信号类型的所述第一信号包括所述第一部分、所述第二部分和第三部分,所述第三部分位于所述第一部分和所述第二部分之间,所述第三部分占用第三时间单元的长度;
    在所述第一信号的信号类型为所述第一信号类型的情况下,所述第一信号的信号参数包括以下任意一项:
    所述第一时间单元的长度;
    所述第二时间单元的长度;
    所述第一时间单元与所述第二时间单元的长度和;
    在所述第一信号的信号类型为所述第二信号类型的情况下,所述第一信号的信号参数包括以下任意一项:
    所述第一时间单元的长度,以及所述第三时间单元的长度;
    所述第二时间单元的长度,以及所述第三时间单元的长度;
    所述第一时间单元的长度,以及所述第一时间单元与所述第三时间单元的长度和;
    所述第一时间单元的长度,以及所述第二时间单元与所述第三时间单元的长度和;
    所述第二时间单元的长度,以及所述第一时间单元与所述第三时间单元的长度和;
    所述第二时间单元的长度,以及所述第二时间单元与所述第三时间单元的长度和。
  14. 根据权利要求10或12所述的方法,其中,
    所述第二信号的信号调制类型包括以下任意一项:
    第一调制类型,所述第一调制类型为对所述第一信号进行幅度差分调制的调制类型;
    第二调制类型,所述第二调制类型为对所述第一信号进行相位差分调制的调制类型;
    第三调制类型,所述第三调制类型为对所述第一信号进行幅度和相位差分调制的调制类型;
    所述第二信号的信号调制参数包括以下一项或者多项:
    所述第二信号的一个或多个符号周期长度;
    所述第二信号的半符号周期长度;
    所述第二信号的调制阶数。
  15. 一种反向散射通信方法,包括:
    第三通信设备接收第二通信设备发送的第三信号;
    所述第三通信设备根据第三信息确定第二信号的信号调制类型和信号调制参数;
    所述第三通信设备根据所述第二信号的信号调制类型和信号调制参数从所述第三信号中解调制出第二信号调制的比特信息;
    其中,所述第三信号是所述第二通信设备根据所述第二信号对第一通信设备发送的第一信号进行调制生成的信号,所述第二信号是所述第二通信设备对所述第一信号进行幅度维度和/或相位维度差分调制时所使用的基带信号,所述第一信号包括第一部分和第二部分,所述第一部分占用第一时间单元的长度,所述第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同。
  16. 根据权利要求15所述的方法,其中,
    所述第三信息包括:由所述第一通信设备指示的第二指示信息;
    或者,
    所述第三信息包括:由所述第二通信设备指示的第四指示信息;
    或者,
    所述第三信息包括:由第四通信设备配置或指示第五指示信息,所述第四通信设备为所述第一通信设备、所述第二通信设备、第三通信设备中的任意一项,或者所述第四通信设备为第三方通信设备;
    其中,所述第二指示信息用于指示所述第二信号的信号调制类型和信号调制参数,所述第四指示信息用于指示所述第二信号的信号调制类型和信号调制参数,所述第五指示信息用于指示所述第二信号的信号调制类型和信号调制参数。
  17. 根据权利要求16所述的方法,其中,在所述第三信息包括:由所述第一通信设备指示的第二指示信息,或所述第三信息包括:由所述第二通信设备指示的第四指示信息,或所述第三信息包括:由所述第四通信设备配置或指示的第五指示信息,且所述第四通信设备不为所述第三通信设备的情况下,所述方法还包括:
    所述第三通信设备接收所述第三信息;
    其中,所述第三信息通过RRC信令、MAC CE、DCI、SCI以及前导序列中的至少一种方式配置或指示。
  18. 根据权利要求15所述的方法,其中,
    所述第一信号的信号类型包括以下任意一项:
    第一信号类型,所述第一信号类型的所述第一信号包括所述第一部分和所述第二部分;
    第二信号类型,所述第二信号类型的所述第一信号包括所述第一部分、所述第二部分和第三部分,所述第三部分位于所述第一部分和所述第二部分之间,所述第三部分占用第三时间单元的长度;
    在所述第一信号的信号类型为所述第一信号类型的情况下,所述第一信号的信号参数包括以下任意一项:
    所述第一时间单元的长度;
    所述第二时间单元的长度;
    所述第一时间单元与所述第二时间单元的长度和;
    在所述第一信号的信号类型为所述第二信号类型的情况下,所述第一信号的信号参数包括以下任意一项:
    所述第一时间单元的长度,以及所述第三时间单元的长度;
    所述第二时间单元的长度,以及所述第三时间单元的长度;
    所述第一时间单元的长度,以及所述第一时间单元与所述第三时间单元的长度和;
    所述第一时间单元的长度,以及所述第二时间单元与所述第三时间单元的长度和;
    所述第二时间单元的长度,以及所述第一时间单元与所述第三时间单元的长度和;
    所述第二时间单元的长度,以及所述第二时间单元与所述第三时间单元的长度和。
  19. 根据权利要求15或16所述的方法,其中,
    所述第二信号的信号调制类型包括以下任意一项:
    第一调制类型,所述第一调制类型为对所述第一信号进行幅度差分调制的调制类型;
    第二调制类型,所述第二调制类型为对所述第一信号进行相位差分调制的调制类型;
    第三调制类型,所述第三调制类型为对所述第一信号进行幅度和相位差分调制的调制类型;
    所述第二信号的信号调制参数包括以下一项或者多项:
    所述第二信号的一个或多个符号周期长度;
    所述第二信号的半符号周期长度;
    所述第二信号的调制阶数。
  20. 根据权利要求15所述的方法,其中,所述第三通信设备根据所述第二信号的信号调制类型和信号调制参数从所述第三信号中解调制出第二信号调制的比特信息,包括:
    所述第三通信设备将所述第三信号的一个符号周期中的前半个符号周期的信号与后半个符号周期的信号相减,得到差分信号;
    所述第三通信设备根据所述差分信号,解调制出所述第二信号携带的比特信息。
  21. 根据权利要求20所述的方法,其中,所述第三通信设备根据所述差分信号,解调制出所述第二信号的比特信息,包括:
    所述第三通信设备通过判决函数和所述差分信号,获得所述差分信号的判决值;
    所述第三通信设备根据与所述判决值最接近的所述判决阈值,解调出所述第二信号携带的比特信息。
  22. 一种反向散射通信方法,包括以下一项或者多项:
    第四通信设备向第一通信设备配置或指示第一信息;
    所述第四通信设备向第二通信设备配置或指示第二信息;
    所述第四通信设备向第三通信设备配置或指示第三信息;
    其中,所述第一信息用于所述第一通信设备确定第一信号,所述第二信息用于所述第二通信设备确定第二信号,所述第三信息用于所述第三通信设备确定所述第二信号的信号调制类型和信号调制参数,所述第一信号包括第一部分和第二部分,所述第一部分占用第一时间单元的长度,所述第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同,所述第二信号是所述第二通信设备对所述第一信号进行幅度维度和/或相位维度差分调制时所使用的基带信号。
  23. 根据权利要求22所述的方法,其中,
    所述第一信息包括:由所述第四通信设备配置或指示的第一指示信息,所述第一指示信息用于指示所述第一信号的信号类型和信号参数;
    所述第二信息包括:由所述第四通信设备配置或指示的第三指示信息,所述第三指示信息用于指示所述第二信号的信号调制类型和信号调制参数;
    所述第三信息包括:由所述第四通信设备配置或指示的第五指示信息,所述第五指示 信息用于指示所述第二信号的信号调制类型和信号调制参数。
  24. 根据权利要求23所述的方法,其中,
    所述第一信号的信号类型包括以下任意一项:
    第一信号类型,所述第一信号类型的所述第一信号包括所述第一部分和所述第二部分;
    第二信号类型,所述第二信号类型的所述第一信号包括所述第一部分、所述第二部分和第三部分,所述第三部分位于所述第一部分和所述第二部分之间,所述第三部分占用第三时间单元的长度;
    在所述第一信号的信号类型为所述第一信号类型的情况下,所述第一信号的信号参数包括以下任意一项:
    所述第一时间单元的长度;
    所述第二时间单元的长度;
    所述第一时间单元与所述第二时间单元的长度和;
    在所述第一信号的信号类型为所述第二信号类型的情况下,所述第一信号的信号参数包括以下任意一项:
    所述第一时间单元的长度,以及所述第三时间单元的长度;
    所述第二时间单元的长度,以及所述第三时间单元的长度;
    所述第一时间单元的长度,以及所述第一时间单元与所述第三时间单元的长度和;
    所述第一时间单元的长度,以及所述第二时间单元与所述第三时间单元的长度和;
    所述第二时间单元的长度,以及所述第一时间单元与所述第三时间单元的长度和;
    所述第二时间单元的长度,以及所述第二时间单元与所述第三时间单元的长度和。
  25. 根据权利要求23所述的方法,其中,
    所述第二信号的信号调制类型包括以下任意一项:
    第一调制类型,所述第一调制类型为对所述第一信号进行幅度差分调制的调制类型;
    第二调制类型,所述第二调制类型为对所述第一信号进行相位差分调制的调制类型;
    第三调制类型,所述第三调制类型为对所述第一信号进行幅度和相位差分调制的调制类型;
    所述第二信号的信号参数包括以下一项或者多项:
    所述第二信号的一个或多个重复周期长度;
    所述第二信号的半重复周期长度;
    所述第二信号的调制阶数。
  26. 根据权利要求22所述的方法,
    其中,所述第一信息、所述第二信息和/或所述第三信息通过RRC信令、MAC CE、DCI、SCI以及前导序列中的至少一种方式配置或指示。
  27. 一种反向散射通信装置,包括:
    第一确定模块,用于根据第一信息确定第一信号;
    第一发送模块,用于向第二通信设备发送所述第一信号;
    其中,所述第一信号包括第一部分和第二部分,所述第一部分占用第一时间单元的长度,所述第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同。
  28. 一种反向散射通信装置,包括:
    第一接收模块,用于接收第一通信设备发送的第一信号;
    第二确定模块,用于根据第二信息确定第二信号;
    调制模块,用于根据所述第二信号对所述第一信号进行反向散射调制,生成第三信号;
    第二发送模块,用于向第三通信设备发送所述第三信号;
    其中,所述第一信号包括第一部分和第二部分,所述第一部分占用第一时间单元的长度,所述第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同,所述第二信号是所述反向散射通信装置对所述第一信号进行幅度维度和/或相位维度差分调制时所使用的基带信号。
  29. 一种反向散射通信装置,包括:
    第二接收模块,用于接收第二通信设备发送的第三信号;
    第三确定模块,用于根据第三信息确定第二信号的信号调制类型和信号调制参数;
    解调模块,用于根据所述第二信号的信号调制类型和信号调制参数从所述第三信号中解调制出第二信号的比特信息;
    其中,所述第三信号是所述第二通信设备根据所述第二信号对第一通信设备发送的第一信号进行调制生成的信号,所述第二信号是所述第二通信设备对所述第一信号进行幅度维度和/或相位维度差分调制时所使用的基带信号,所述第一信号包括第一部分和第二部分,所述第一部分占用第一时间单元的长度,所述第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同。
  30. 一种反向散射通信装置,包括:
    配置模块,用于以下一项或者多项:
    向第一通信设备配置或指示第一信息;
    向第二通信设备配置或指示第二信息;
    向第三通信设备配置或指示第三信息;
    其中,所述第一信息用于所述第一通信设备确定第一信号,所述第二信息用于所述第二通信设备确定第二信号,所述第三信息用于所述第三通信设备确定所述第二信号的信号调制类型和信号调制参数,所述第一信号包括第一部分和第二部分,所述第一部分占用第一时间单元的长度,所述第二部分占用第二时间单元的长度,所述第一时间单元的长度和所述第二时间单元的长度相同,所述第一时间单元中的数据与所述第二时间单元中的数据 相同,所述第二信号是所述第二通信设备对所述第一信号进行幅度维度和/或相位维度差分调制时所使用的基带信号。
  31. 一种通信设备,包括处理器和存储器,所述存储器存储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至7任一项所述的反向散射通信方法的步骤,或者实现如权利要求8至14任一项所述的反向散射通信方法的步骤,或者实现如权利要求15至21任一项所述的反向散射通信方法的步骤,或者实现如权利要求22至26任一项所述的反向散射通信方法的步骤。
  32. 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至7任一项所述的反向散射通信方法的步骤,或者实现如权利要求8至14任一项所述的反向散射通信方法的步骤,或者实现如权利要求15至21任一项所述的反向散射通信方法的步骤,或者实现如权利要求22至26任一项所述的反向散射通信方法的步骤。
PCT/CN2023/106959 2022-07-19 2023-07-12 反向散射通信方法、设备及可读存储介质 WO2024017114A1 (zh)

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