WO2021119987A1 - Procédé de communication par rétrodiffusion, dispositif d'excitation, réflecteur et récepteur - Google Patents

Procédé de communication par rétrodiffusion, dispositif d'excitation, réflecteur et récepteur Download PDF

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Publication number
WO2021119987A1
WO2021119987A1 PCT/CN2019/125920 CN2019125920W WO2021119987A1 WO 2021119987 A1 WO2021119987 A1 WO 2021119987A1 CN 2019125920 W CN2019125920 W CN 2019125920W WO 2021119987 A1 WO2021119987 A1 WO 2021119987A1
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Prior art keywords
signal
receiver
excitation
exciter
reflector
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PCT/CN2019/125920
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English (en)
Chinese (zh)
Inventor
颜矛
高宽栋
黄煌
邵华
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华为技术有限公司
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Priority to PCT/CN2019/125920 priority Critical patent/WO2021119987A1/fr
Priority to CN201980102391.9A priority patent/CN114731498A/zh
Publication of WO2021119987A1 publication Critical patent/WO2021119987A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication

Definitions

  • the present application relates to the field of communication, and more specifically, to a reflection communication method, exciter, reflector, and receiver.
  • the reflector In reflection communication, the reflector generally reflects the excitation signal of the exciter and carries data during reflection.
  • the multiple input multiple output (MIMO) technology can improve the transmission performance and efficiency of the communication system.
  • MIMO multiple input multiple output
  • the traditional exciter The current multi-antenna precoding technology cannot be recognized, and the processing process of the current multi-antenna precoding technology is complicated.
  • the data received by the receiving end may not be accurate.
  • the present application provides a reflection communication method, exciter, reflector and receiver, which can improve the performance of reflection communication to receive data.
  • a reflection communication method comprising: an exciter sending a first excitation signal, the first excitation signal being used to provide the reflector with energy and an information carrier for reflecting the first reference signal to the receiver ,
  • the first reference signal is used for the receiver to obtain precoding information;
  • the exciter receives the precoding information from the receiver;
  • the exciter sends a second excitation signal, and the second excitation signal includes the precoding information modulated
  • the second excitation signal is used to provide the reflector with energy and information carrier for reflecting the data signal to the receiver.
  • the interference between reflected communication channels can be reduced, and the performance of the data received by the receiving end can be improved.
  • the precoding information may be pre-modulation information sent by each antenna port of the exciter, or precoding information sent by each antenna port of the exciter, or between signals sent by each antenna port of the exciter. Phase difference and/or amplitude difference information, etc.
  • the first reference signal may be predefined by the system or configured by the exciter.
  • start time and time length of sending the first excitation signal and the second excitation signal are configured by the controller.
  • the second excitation signal is determined according to the second reference signal corresponding to each of the multiple antenna ports, and the second reference signal corresponding to each of the multiple antenna ports is the same Reference signal.
  • the exciter may send the product of the precoding information modulation signal and the second reference signal, and the second reference signal may be predefined by the system or configured by the exciter, or formed in a preset manner sequence.
  • the second reference signals corresponding to each of the multiple antenna ports may also be different reference signals.
  • the signal modulated by the precoding information includes a signal modulated by the precoding information through any one of the following modulation methods: it may be quadrature phase shift keying (quadrature). Phase shift keying, QPSK), can also be quadrature amplitude modulation (quadrature amplitude modulation, QAM), such as 16QAM, 64QAM, 256QAM, and 1024QAM.
  • QPSK quadrature phase shift keying
  • QAM quadrature amplitude modulation
  • the exciter directly modulates the precoding information and sends it, which is beneficial to improve the performance of the reflection communication system.
  • the first reference signal is used by the receiver to obtain precoding information, including: the receiver performs the exciter-reflector-based on the first reference signal The cascaded channel between the receivers is estimated to obtain precoding information.
  • the receiver may also estimate the channel between the exciter and the reflector and the channel between the reflector and the receiver according to the first reference signal to obtain the precoding information.
  • the first excitation signal includes excitation signals corresponding to multiple antenna ports, and the excitation signals corresponding to the multiple antenna ports are mutually orthogonal or quasi-orthogonal.
  • a reflection communication method comprising: a reflector receiving a first excitation signal sent by an exciter, and the first excitation signal is used to provide the reflector with energy for reflecting the first reference signal to the receiver And an information carrier; according to the first excitation signal, the reflector reflects the first reference signal to the receiver, and the first reference signal is used for the receiver to obtain precoding information; the reflector receives the second excitation sent by the exciter Signal, the second excitation signal is used to provide the reflector with energy and information carrier for reflecting the data signal to the receiver; according to the second excitation signal, the reflector reflects the data signal to the receiver, and the second excitation The signal includes a signal modulated by precoding information.
  • the precoding information may be pre-modulation information sent by each antenna port of the exciter, or precoding information sent by each antenna port of the exciter, or between signals sent by each antenna port of the exciter. Phase difference and/or amplitude difference information.
  • the first reference signal may be predefined by the system or configured by the exciter.
  • the second excitation signal is determined according to the second reference signal corresponding to each of the multiple antenna ports, and the second reference signal corresponding to each of the multiple antenna ports is It is the same reference signal.
  • the second reference signal may be predefined by the system or configured by the exciter.
  • the reflector reflects the data signal and/or the third reference signal, which facilitates the demodulation of the data signal by the receiving end.
  • the signal modulated by the precoding information includes a signal modulated by the precoding information through any one of the following modulation methods: QPSK, 16QAM, 64QAM, 256QAM, and 1024QAM.
  • the exciter directly modulates the precoding information and sends it, which is beneficial to improve the performance of the reflection communication system.
  • the use of the first reference signal for the receiver to obtain precoding information includes: the receiver performs the exciter-reflector-based on the first reference signal The cascaded channel between the receivers is estimated to obtain precoding information.
  • the receiver may also estimate the channel between the exciter and the reflector and the channel between the reflector and the receiver according to the first reference signal to obtain the precoding information.
  • the first excitation signal includes excitation signals corresponding to the multiple antenna ports, and the excitation signals corresponding to the multiple antenna ports are mutually orthogonal or quasi-orthogonal.
  • a reflection communication method includes: a receiver receives a first reference signal reflected by a reflector according to a first excitation signal; the receiver obtains precoding information according to the first reference signal; The device sends the precoding information to the exciter; the receiver receives the data signal reflected by the reflector according to the second excitation signal, and the second excitation signal is determined according to the signal modulated by the precoding information.
  • the receiver obtains precoding information according to the first reference signal, and the exciter receives and modulates the precoding information fed back by the receiver.
  • This solution can reduce the interference between reflected communication channels and improve the receiving end The performance of the data.
  • the first reference signal may be predefined by the system or configured by the exciter.
  • the receiver receives the data signal and/or the third reference signal reflected by the reflector, and the second excitation signal includes a signal modulated by precoding information.
  • the third reference signal facilitates the receiver to demodulate the data signal of the reflector.
  • the second excitation signal is determined according to the second reference signal corresponding to each of the multiple antenna ports, and the second reference signal corresponding to each of the multiple antenna ports is The same reference signal.
  • the second reference signal may be predefined by the system or configured by the exciter.
  • the second reference signals corresponding to each of the multiple antenna ports may also be different reference signals.
  • the signal modulated by the precoding information includes a signal modulated by the precoding information through any one of the following modulation methods: QPSK, 16QAM, 64QAM, 256QAM, and 1024QAM.
  • the exciter directly modulates the precoding information and sends it, which is beneficial to improve the performance of the reflection communication system.
  • the use of the first reference signal for the receiver to obtain precoding information includes: the receiver performs the exciter-reflector-based on the first reference signal The cascaded channel between the receivers is estimated to obtain precoding information.
  • the receiver may also estimate the channel between the exciter and the reflector and the channel between the reflector and the receiver according to the first reference signal to obtain precoding information.
  • the first excitation signal includes excitation signals corresponding to multiple antenna ports, and the excitation signals corresponding to the multiple antenna ports are mutually orthogonal or quasi-orthogonal.
  • an exciter in a fourth aspect, includes: a sending module for sending a first excitation signal, the first excitation signal is used to provide a reflector with energy for reflecting the first reference signal to the receiver and An information carrier, the first reference signal is used for the receiver to obtain precoding information; a receiving module is used for receiving the precoding information from the receiver; the sending module is also used for sending a second excitation signal, the second excitation signal A signal modulated by the precoding information is included, and the second excitation signal is used to provide a reflector with energy and an information carrier for reflecting the data signal to the receiver.
  • the interference between reflected communication channels can be reduced, and the performance of the data received by the receiving end can be improved.
  • the precoding information may be pre-modulation information sent by each antenna port of the exciter, or precoding information sent by each antenna port of the exciter, or between signals sent by each antenna port of the exciter. Phase difference and/or amplitude difference information.
  • the first reference signal may be predefined by the system or configured by the exciter.
  • start time and time length of sending the first excitation signal and the second excitation signal are configured by the controller.
  • the second excitation signal is determined according to the second reference signal corresponding to each of the multiple antenna ports, and the second reference signal corresponding to each of the multiple antenna ports is The same reference signal.
  • the exciter may send the product of the precoding information modulation signal and the second reference signal.
  • the second reference signals corresponding to each of the multiple antenna ports may also be different reference signals.
  • the second reference signal may be predefined by the system or configured by the exciter.
  • the signal modulated by the precoding information includes a signal modulated by the precoding information through any one of the following modulation methods: QPSK, 16QAM, 64QAM, 256QAM, and 1024QAM.
  • the exciter directly modulates the precoding information and sends it, which is beneficial to improve the performance of the reflection communication system.
  • the first reference signal is used for the receiver to obtain precoding information, including: the receiver performs the exciter-reflector-based on the first reference signal The cascaded channel between the receivers is estimated to obtain precoding information.
  • the receiver may also estimate the channel between the exciter and the reflector and the channel between the reflector and the receiver according to the first reference signal to obtain precoding information.
  • the first excitation signal includes excitation signals corresponding to the multiple antenna ports, and the excitation signals corresponding to the multiple antenna ports are mutually orthogonal or quasi-orthogonal.
  • a reflector in a fifth aspect, includes a first receiving module for receiving a first excitation signal sent by the exciter, and the first excitation signal is used to provide the reflector for reflecting the first excitation signal to the receiver.
  • the energy and information carrier of a reference signal a first reflection module, configured to reflect a first reference signal to the receiver according to the first excitation signal, and the first reference signal is used by the receiver to obtain precoding information;
  • the receiving module is used to receive a second excitation signal sent by the exciter, and the second excitation signal is used to provide the reflector with energy and information carrier for reflecting the data signal to the receiver;
  • the second reflection module is used to The second excitation signal reflects the data signal to the receiver, and the second excitation signal includes a signal modulated by precoding information.
  • the interference between reflected communication channels can be reduced, and the performance of the data received by the receiving end can be improved.
  • the first receiving module and the second receiving module may be the same module; the first reflection module and the second reflection module may be the same module.
  • the first reference signal may be predefined by the system or configured by the exciter.
  • the second excitation signal is determined according to the second reference signal corresponding to each of the multiple antenna ports, and the second reference signal corresponding to each of the multiple antenna ports is The same reference signal.
  • the second reference signal may be predefined by the system or configured by the exciter.
  • the signal modulated by the precoding information includes a signal modulated by the precoding information through any one of the following modulation methods: QPSK, 16QAM, 64QAM, 256QAM, and 1024QAM.
  • the exciter directly modulates the precoding information and sends it, which is beneficial to improve the performance of the reflection communication system.
  • the first reference signal is used by the receiver to obtain precoding information, including: the receiver performs the exciter-reflector-receiving function according to the first reference signal.
  • the cascaded channel between the receivers is estimated to obtain precoding information.
  • the receiver estimates the channel between the exciter and the reflector and the channel between the reflector and the receiver according to the first reference signal to obtain precoding information.
  • the first excitation signal includes excitation signals corresponding to the multiple antenna ports, and the excitation signals corresponding to the multiple antenna ports are mutually orthogonal or quasi-orthogonal.
  • a receiver in a sixth aspect, includes: a receiving module for receiving a first reference signal reflected by a reflector during a process in which the exciter sends a first excitation signal; and a processing module for receiving a first reference signal reflected by the reflector according to the A reference signal for obtaining precoding information; a sending module for sending the precoding information to the exciter; the receiving module is also used for receiving the data signal reflected by the reflector during the process of sending the second excitation signal by the exciter, The second excitation signal is determined according to the signal modulated by the precoding information.
  • the receiver obtains precoding information according to the first reference signal, and the exciter receives and modulates the precoding information fed back by the receiver.
  • This solution can reduce the interference between reflected communication channels and improve the receiving end The performance of the data.
  • the precoding information may be pre-modulation information sent by each antenna port of the exciter, or precoding information sent by each antenna port of the exciter, or between signals sent by each antenna port of the exciter. Phase difference and/or amplitude difference information, etc.
  • the first reference signal may be predefined by the system or configured by the exciter.
  • the receiver receives the data signal and/or the second reference signal reflected by the reflector, and the second excitation signal is an excitation generated based on the precoding information. signal.
  • the second excitation signal is determined according to the second reference signal corresponding to each of the multiple antenna ports, and the second reference signals corresponding to each of the multiple antenna ports are the same Reference signal.
  • the second reference signal may be predefined by the system or configured by the exciter.
  • the signal modulated by the precoding information includes a signal modulated by the precoding information through any one of the following modulation methods: QPSK, 16QAM, 64QAM, 256QAM, and 1024QAM.
  • the exciter directly modulates the precoding information and sends it, which is beneficial to improve the performance of the reflection communication system.
  • using the first reference signal for the receiver to obtain precoding information includes: the receiver performs the exciter-reflector-based on the first reference signal The cascaded channel between the receivers is estimated to obtain precoding information.
  • the receiver may also estimate the channel between the exciter and the reflector and the channel between the reflector and the receiver according to the first reference signal to obtain precoding information.
  • the first excitation signal includes excitation signals corresponding to the multiple antenna ports, and the excitation signals corresponding to the multiple antenna ports are mutually orthogonal or quasi-orthogonal.
  • an exciter including a transceiving circuit and a processing circuit, the processing circuit is configured to use the transceiving circuit to execute the method as described in the first aspect.
  • a reflector including a transceiving circuit and a processing circuit, and the processing circuit is configured to use the transceiving circuit to perform the method as described in the second aspect.
  • a receiver including a transceiving circuit and a processing circuit, and the processing circuit is configured to use the transceiving circuit to execute the method as described in the third aspect.
  • FIG. 1 is a schematic architecture diagram of a reflection communication system according to an embodiment of the present application.
  • Fig. 2 is a schematic diagram of reflective communication in an embodiment of the present application.
  • FIG. 3 is another schematic diagram of reflection communication according to an embodiment of the present application.
  • Fig. 4 is a schematic diagram of the hardware structure of an embodiment of the present application.
  • FIG. 5 is a schematic diagram of the time-frequency structure of the first excitation signal in an embodiment of the present application.
  • FIG. 6 is a schematic diagram of a time-frequency structure of a second excitation signal according to an embodiment of the present application.
  • FIG. 7 is a schematic diagram of the time structure of an excitation signal in an embodiment of the present application.
  • FIG. 8 is a schematic diagram of the time structure of the reflected signal in an embodiment of the present application.
  • Fig. 9 is a schematic diagram of a receiver according to an embodiment of the present application.
  • Fig. 10 is a schematic diagram of an exciter according to an embodiment of the present application.
  • Fig. 11 is a schematic diagram of a reflector according to an embodiment of the present application.
  • Fig. 1 shows a schematic architecture diagram of a reflective communication system according to an embodiment of the present application.
  • the reflection communication system 100 at least includes an exciter, a reflector, and a receiver.
  • the exciter sends a wireless signal; the reflector receives the wireless signal from the exciter and reflects the signal; during reflection, the reflector carries its own signal on the reflected signal; the receiver demodulates the reflected signal On the data.
  • the working mode or ability of the reflector it is divided into passive (the energy required for data processing and reflection is obtained through wireless signals) and semi-active (that is, part of the communication process requires battery or other means to supply power). Regardless of passive or semi-active, low power consumption or even no external power communication is achieved by carrying data on the reflected wireless signal.
  • the exciter is a user equipment (UE), and the receiver is a base station; the exciter is a base station, and the receiver is It is user equipment; both the exciter and receiver are user equipment; both the exciter and receiver are base stations.
  • UE user equipment
  • the exciter is a base station
  • the receiver is It is user equipment
  • both the exciter and receiver are user equipment
  • both the exciter and receiver are base stations.
  • any one of the exciter, reflector, and receiver can be interpreted as: network equipment, terminal equipment (UE), internet of things (IoT), existing 3GPP network Any of the devices; or interpreted as a reader or tag in an RFID network; or a dedicated receiver (a device dedicated to receiving reflected signals, which can be connected to a network device or directly Connected to a cellular network); or a dedicated exciter (a device dedicated to sending excitation signals can be connected to the network device or directly connected to the cellular network).
  • UE terminal equipment
  • IoT internet of things
  • 3GPP 3GPP
  • the terminal equipment in the embodiments of this application may refer to user equipment, access terminals, user units, user stations, mobile stations, mobile stations, remote stations, remote terminals, mobile equipment, user terminals, terminals, wireless communication equipment, user agents, or User device.
  • the terminal device can also be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), with wireless communication Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in the future 5G network, or future evolution of the public land mobile network (PLMN) Terminal equipment, etc., this embodiment of the present application is not limited thereto.
  • SIP session initiation protocol
  • WLL wireless local loop
  • PDA personal digital assistant
  • the network device in the embodiment of the application may be a device used to communicate with terminal devices.
  • the network device may be a global system of mobile communication (GSM) system or code division multiple access (CDMA)
  • GSM global system of mobile communication
  • CDMA code division multiple access
  • the base transceiver station (BTS) in the LTE system can also be the base station (nodeB, NB) in the wideband code division multiple access (WCDMA) system, or the evolutionary base station (evolutional base station) in the LTE system.
  • nodeB eNB or eNodeB
  • it can also be a wireless controller in a cloud radio access network (CRAN) scenario
  • the network device can be a relay station, access point, vehicle-mounted device, wearable device, and future
  • the network equipment in the 5G network or the network equipment in the future evolved PLMN network, etc., are not limited in the embodiment of the present application.
  • exciter helper, interrogator, reader, user equipment (UE); other possible titles of reflector: backscatter device, battery-less device , Passive devices, semi-passive devices, ambient signal devices, tags, etc. Reflective communication is also called: passive communication, passive communication, ambient communication, etc.
  • the backscatter communication system may also include a controller.
  • the receiver is a controller, and the controller sends the excitation signal configuration information and/or reflection to the exciter or the receiver.
  • the signal configuration information can be through radio resource control (radio resource control, RRC) signaling, medium access control-control element (MAC CE), medium access control-protocol data unit (medium access control- At least one indication of protocol data unit, MAC-PDU), downlink control information (DCI), and system information.
  • the reflection signal configuration information sent to the reflector is notified to the reflector through at least one of the reflection link control information of the exciter, the reflection link radio resource control information, and the reflection link medium access control information.
  • the reflection link refers to the communication link from the exciter to the reflector, or the communication link from the exciter to the reflector to the receiver.
  • the excitation signal configuration information includes, but is not limited to: the frequency, time, subcarrier spacing, number of transmission ports of the excitation signal, the signal mapped to each port, and the frequency and/or time position of the excitation signal.
  • the reflected signal configuration information includes but is not limited to: reflected data symbol rate, reflection start time and time length, reflected data bit time width, and reflected data bit rate.
  • FIG. 1 is only a schematic diagram showing when the exciter is used as a controller.
  • the exciter can be a controller, and the excitation signal and/or reflected signal configuration information is sent to the receiver to For the receiver to cancel the excitation signal and/or demodulate the reflected signal.
  • the third-party device is a controller, and the excitation signal and/or reflected signal configuration information is sent to the receiver for the receiver to perform excitation signal cancellation and/or reflected signal demodulation. This is not specifically limited.
  • the exciter and the receiver in the backscatter communication system 100 may be integrated into the same node and are the same device.
  • the exciter and receiver are integrated in the same node, which is called a reader.
  • the communication process can be divided into the following steps:
  • Step 1 Send a continuous wave (CW), that is, a single tone signal/cosine signal/sine signal to provide energy to the reflector.
  • CW continuous wave
  • Step 2 The reader sends an amplitude-shift keying (ASK) signal to charge the reflector and send control information.
  • ASK amplitude-shift keying
  • the activated reflector demodulates the ASK of the reader, Obtain the control information, and then perform corresponding operations in Step 3.
  • Step 3 The reader continuously sends continuous waves to provide energy and information carriers to the reflector; the reflector reflects the data signal according to the control information of the reader; the reader receives the signal while sending the continuous wave excitation signal And try to demodulate the reflected data.
  • Step 4 The reading or writing process of the reflector by the reader can go through Step 1 to Step 3 many times until the target operation is completed.
  • the excitation signal sent by the exciter has two functions: charging and acting as a reflective data carrier, that is, providing energy and information carrier for the reflector.
  • the reflector reflects the signal, it relies on the excitation signal for power supply and carries its own data signal in the excitation signal.
  • the signal sent by the exciter can be a single-tone signal (ie, a continuous sine wave) or a single-carrier signal, or a multi-tone signal (for example, a signal with a certain bandwidth).
  • the signal sent by the exciter is a known signal or a data signal sent to the receiver.
  • the reader sending excitation signal
  • CW continuous wave
  • the multiple input multiple output (MIMO) technology in the cellular network that is, the multiple antenna technology is divided into downlink and uplink.
  • MIMO uplink process the base station sends a precoding matrix indicator (transmitted precoding matrix indicator, TPMI) to tell the terminal to perform the transmission operation, and the precoding formula is more complicated.
  • TPMI transmitted precoding matrix indicator
  • the precoding matrix W W1*W2
  • W1 represents L orthogonal beam precoding (usually DFT matrix is used for uniform amplitude)
  • W2 is the combination of L beams, generally using orthogonal phase shift Keying (quadrature phase shift keying, QPSK) or 8-PSK performs quantization processing, and through two-level coding, non-uniform precoding can be realized so that different spatial channel components have different weights.
  • QPSK quadrature phase shift keying
  • 8-PSK performs quantization processing
  • the embodiment of the present application reduces the interference between channels through the feedback-based multi-antenna excitation method, and can improve the performance of receiving data at the receiving end in reflection communication.
  • Fig. 2 is a schematic diagram of reflective communication according to an embodiment of the present application. As shown in FIG. 2, the method 200 includes step S210 to step S230.
  • Step S210 The exciter sends a first excitation signal, where the first excitation signal is used by the reflector to reflect the first reference signal to the receiver, and the first reference signal is used by the receiver to obtain precoding information.
  • the first reference signal may be configured by the exciter, or may be predefined by the system.
  • the first reference signal may be a demodulation reference signal (DMRS), a channel state information reference signal (CSI-RS), a phase tracking reference signal (PTRS), and a sounding reference signal.
  • DMRS demodulation reference signal
  • CSI-RS channel state information reference signal
  • PTRS phase tracking reference signal
  • SRS sounding reference signal
  • PRACH physical random access channel
  • the receiving end knows or can infer the time and frequency position of the signal, and the signal/symbol carried on the time and frequency according to a predetermined rule.
  • the reference signal is used to obtain a known signal that is affected by the outside world (for example, spatial channel, transmitter or receiver device imperfections) during transmission, and is generally used for channel estimation, auxiliary signal demodulation, and detection.
  • the first excitation signal may include excitation signals corresponding to multiple antenna ports, and the excitation signals corresponding to the multiple antenna ports are mutually orthogonal or quasi-orthogonal.
  • the excitation signals corresponding to multiple antenna ports are orthogonal or quasi-orthogonal to each other, it is beneficial for the receiver to perform channel estimation.
  • the excitation signals corresponding to the multiple antenna ports may not trade with each other.
  • the receiver may also perform an exciter-reflector-receiver cascaded channel estimation based on the received first reference signal to obtain precoding information of each antenna port of the exciter.
  • the receiver may also estimate the channel between the exciter and the reflector and the channel between the reflector and the receiver according to the first reference signal to obtain precoding information.
  • the precoding information can be the pre-modulation information sent by each antenna port of the exciter, or the precoding information sent by each antenna port of the exciter, or the phase difference and/or the phase difference between the signals sent by each antenna port of the exciter. Or amplitude difference information, etc.
  • the precoding information can be obtained based on linear precoding methods, such as matched filter, zero-forcing precoding, etc.; the precoding information can also be obtained based on nonlinear precoding methods, such as dirty paper coding, vector precoding, etc. Etc., the embodiment of the present application does not specifically limit this.
  • step S220 the exciter receives the precoding information.
  • Step S230 The exciter modulates the precoding information and sends a second excitation signal, which is determined according to the signal modulated by the precoding information.
  • the exciter may modulate the precoding information before sending it.
  • the modulation method may be any one of QPSK, 16QAM, 64QAM, 256QAM, and 1024QAM.
  • the exciter directly modulates the precoding information and sends it directly, which is beneficial to improve the performance of the reflection communication system.
  • the exciter may also obtain the precoding weight for sending the second excitation signal by looking up the table according to the precoding information.
  • the exciter may also obtain the precoding weight of each antenna port by looking up a table according to the precoding information of each antenna port, and send the second excitation signal according to the precoding weight.
  • the precoding weight in the table is the symbol in the constellation space.
  • the constellation space may be at least one of QPSK, 16QAM, 64QAM, 256QAM, and 1024QAM.
  • the receiver may also receive the data signal and/or the second reference signal reflected by the reflector, and the second excitation signal includes the signal modulated by the precoding information.
  • the second excitation signal may also be determined according to the second reference signal corresponding to each of the multiple antenna ports.
  • the second excitation signal includes the same second reference signal corresponding to each of the multiple antenna ports, the same interference between multiple signals sent by the excitation signal is avoided, which is beneficial for the receiver to demodulate the data signal. Thereby, the system performance of reflection communication can be improved.
  • the second reference signal may be pre-defined by the system or configured by the exciter, such as a sequence formed by a preset method. The sequence is a scrambled signal, which can avoid the same interference between various channels.
  • the second reference signal may also be a demodulation reference signal (DMRS), a channel state information reference signal (channel state information reference signal, CSI-RS), a phase tracking reference signal (phase tracking reference signal, PTRS), Sounding reference signal (sounding reference signal, SRS), physical random access channel (physical random access channel, PRACH), etc., are not specifically limited in the embodiment of the present application.
  • DMRS demodulation reference signal
  • CSI-RS channel state information reference signal
  • PTRS phase tracking reference signal
  • Sounding reference signal sounding reference signal
  • SRS sounding reference signal
  • PRACH physical random access channel
  • the receiver first performs channel estimation of reflection communication based on the received reference signal, obtains precoding information, and then feeds back the precoding information to the exciter, and the exciter modulates the precoding information and performs corresponding actions.
  • Power matching sends a second excitation signal, the second excitation signal includes a pre-coded information modulation signal, in this process, the reflector reflects the data signal.
  • This scheme uses excitation to directly modulate the precoding information before sending it, which can reduce the interference between reflected communication channels and improve the performance of the receiving end to receive data.
  • FIG. 3 is another schematic diagram of reflection communication according to an embodiment of the present application. As shown in FIG. 3, the method 300 includes step S310 to step S370.
  • step S310 the exciter sends a first excitation signal.
  • the first excitation signal may include excitation signals corresponding to multiple antenna ports, and the excitation signals corresponding to the multiple antenna ports are mutually orthogonal or quasi-orthogonal.
  • the excitation signals corresponding to multiple antenna ports are orthogonal or quasi-orthogonal to each other, it is beneficial for the receiver to perform channel estimation.
  • the excitation signals corresponding to the multiple antenna ports may not be orthogonal to each other.
  • the excitation signals corresponding to the multiple antenna ports are orthogonal to each other in a part of time and frequency resources, and are not orthogonal to each other in another part of time and frequency resources.
  • Step S320 the reflector reflects the first reference signal.
  • the reflector In the process of the exciter sending the first excitation signal, the reflector reflects the first reference signal, and the first reference signal is used by the receiver for the channel between the exciter and the reflector and the channel between the reflector and the receiver.
  • the channel is estimated to generate precoding information.
  • the first reference signal may be pre-defined by the system or configured by the exciter, and the first reference signal may also be generated according to a method known by the receiver.
  • the first reference signal may be DMRS, CSI-RS, PTRS, SRS, PRACH, CSI-RS, etc., which is not specifically limited in the embodiment of the present application.
  • Step S330 The receiver performs channel estimation according to the received first reference signal, and obtains precoding information.
  • the receiver performs channel estimation according to the received first reference signal.
  • the channel includes the channel between the exciter and the reflector and the channel between the reflector and the receiver. According to the result of the channel estimation, multiple antennas of the exciter are obtained.
  • the precoding information of the port is obtained.
  • the precoding information can be the pre-modulation information sent by each antenna port of the exciter, or the precoding information sent by each antenna port of the exciter, or the phase difference and/or the phase difference between the signals sent by each antenna port of the exciter.
  • amplitude difference information, etc. can also be the phase difference and/or amplitude difference information between the signal sent by each antenna port of the exciter and the reference antenna port.
  • the precoding information can be obtained based on linear precoding methods, such as matched filter, zero-forcing precoding, etc.; the precoding information can also be obtained based on nonlinear precoding methods, such as dirty paper coding, vector precoding, etc. Wait.
  • linear precoding methods such as matched filter, zero-forcing precoding, etc.
  • nonlinear precoding methods such as dirty paper coding, vector precoding, etc. Wait.
  • Step S340 the receiver sends the precoding information to the exciter.
  • the receiver may quantize the precoding information and send it to the exciter.
  • One possible implementation is to quantize the precoding information to the constellation of the exciter modulated data, for example, 16QAM, 64QAM, 256QAM, 1024QAM, and so on.
  • step S350 the exciter modulates the precoding information and sends a second excitation signal.
  • the precoding information of each port of the exciter can be further multiplied by the second reference signal corresponding to the respective antenna port.
  • the second reference signal can be predefined, or configured by the exciter, or based on the receiver's Signal generated in a known way.
  • the second reference signal may be DMRS, CSI-RS, PTRS, SRS, PRACH, CSI-RS, etc.
  • the precoding information of the respective antenna ports may be multiplied by the same second reference signal.
  • the exciter can modulate the precoding information and send it.
  • One possible implementation is to modulate and map the precoding information to a constellation space.
  • the constellation space can be QPSK, 16QAM, 64QAM, 256QAM, or 1024QAM. At least one of them.
  • Step S360 the reflector reflects the data signal.
  • the reflector In the process of the exciter sending the second excitation signal, the reflector reflects the data signal, and the excitation signal is an excitation signal generated based on the precoding information.
  • the reflector reflects the data signal and/or the third reference signal.
  • the reflector reflects the data signal and/or the third reference signal, it is beneficial for the receiving end to demodulate the data signal.
  • the method further includes step S370, the exciter, or receiver or other control entity configures the reflection communication, and completes the parameter configuration required for the reflection communication.
  • the number of antenna ports of the exciter can be notified to the receiver in advance, and the receiver can specifically configure the number of transmission ports and signals according to the number of antenna ports, that is, the number of final transmission ports can be less than the antenna supported by the exciter Number of ports.
  • the excitation signal and/or reflected signal configuration information is sent to the receiver for the receiver to eliminate the excitation signal and/or demodulate the reflected signal.
  • the excitation signal and/or reflected signal configuration information is sent to the receiver for the receiver to eliminate the excitation signal and/or demodulate the reflected signal.
  • the excitation signal configuration information and/or reflected signal configuration information sent to the exciter or receiver can be through radio resource control (radio resource control, RRC) signaling, medium access control-control element (MAC) CE), at least one indication of medium access control-protocol data unit (MAC-PDU), downlink control information (DCI), and system information.
  • the reflection signal configuration information sent to the reflector is notified to the reflector through at least one of the reflection link control information of the exciter, the reflection link radio resource control information, and the reflection link medium access control information.
  • the reflection link refers to the communication link from the exciter to the reflector, or the communication link from the exciter to the reflector to the receiver.
  • the excitation signal configuration information includes, but is not limited to: the frequency, time, subcarrier spacing, number of transmission ports, the signal mapped to each port, and the frequency and/or time position of the excitation signal.
  • the reflected signal configuration information includes but is not limited to: reflected data symbol rate, the first reflection start time and time length (used to estimate the concatenated channel), the second reflection start time and time length (used to reflect the data signal), reflection Data bit time width, reflected data bit rate, etc.
  • the signal model of the MIMO channel is:
  • Reflection data coefficient The default is 1;
  • s k, m is the product of the precoding vector and the reference signal. It can be based on the following assumption: the reference signal is 1, that is, the precoding of each antenna port m is directly transmitted. It can also be assumed that the interference (excitation signal) of adjacent reflected data symbols is eliminated ideally. In fact, if a better reflection data spreading code is adopted to spread the reflector data, the ideal cancellation state can be achieved. For example, a reflector data bit is spread by the following spreading code:
  • N is a non-negative integer.
  • N is 1 or 2.
  • 1 and -1 are the two states of the reflector. In other implementations, it may be other values and/or other numbers of states.
  • a and -A another example of A and B, another example of A and 0, another example of 1 and 0.
  • Another example is four states, A, -A, A*j, -A*j, where j represents a complex number unit.
  • the signal-to-noise ratio needs to be maximized. I.e. maximize energy of.
  • precoding is performed Can get the best received signal-to-noise ratio (i.e. maximize or ). More generally, if for a bandwidth signal, the bandwidth is P (that is, P subcarriers or REs), and there are N receiving antennas, the best precoding vector can be obtained:
  • fg m is a real value, and the value needs to be quantified when the receiver informs the exciter. If the bandwidth, the number of transmitting antennas M, and the number of receiving antennas N are relatively large, it will cause relatively large overhead. Therefore, a quantitative scheme is needed.
  • One implementation is to quantize s k, m, p or s k, m to the constellation of the modulated data of the exciter.
  • the constellation space can be 16QAM, 64QAM, 256QAM, 1024QAM, or digital space signal points corresponding to any data modulation mode supported by other exciters.
  • the reflection data reception has the best signal-to-noise ratio, which can improve the reception performance of the reflection data.
  • Fig. 4 is a hardware structure diagram of reflective communication in an embodiment of the present application.
  • the signal transmitting and receiving unit in the exciter is used for signal transmitting and receiving, and the exciting signal generating unit generates the transmitted data signal.
  • the received signal processing unit of the receiver is used to process the received signal.
  • the reflector includes data receiving and demodulation, energy harvesting and management, signal modulation reflection, control logic or processor (further including a storage unit, and an optional channel coding module).
  • the reflector can also be connected with the sensor or sensor data, so that the reflector can transmit the data collected by the sensor.
  • the data reflected by the reflector can be identification information or other data, such as temperature, humidity and other data collected by the sensor.
  • the internal circuit of the reflector When receiving energy, the internal circuit of the reflector is connected with the energy collection and management module; when reflecting the signal, the internal circuit of the reflector is connected with the signal modulation reflection module.
  • the control logic or processor or called a microprocessor in the reflector mainly performs receiving data processing and reflection data processing.
  • Fig. 5 is a time-frequency structure diagram of a first excitation signal in an embodiment of the present application.
  • the exciter includes two antenna ports, exciter port 1 and exciter port 2.
  • the first excitation signal includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time dimension, and is composed of two resource elements (resource elements, RE) in frequency.
  • OFDM orthogonal frequency division multiplexing
  • the precoding information s 1,1 and s 1,2 of the exciter port 1 is carried in one subcarrier
  • the precoding information s 2,1 and s 2,2 of the exciter port 2 is carried in another subcarrier.
  • This orthogonal frequency resource distinguishes the different antenna ports of the exciter.
  • orthogonal code domain resources can also be used to distinguish different antenna ports of the exciter, and other orthogonal methods can also be used to distinguish each antenna port, such as orthogonal time resources, positive
  • the time/frequency/code domain resources of the handover are distinguished, which is not shown here.
  • the excitation signals corresponding to multiple antenna ports are orthogonal or quasi-orthogonal to each other, it is beneficial for the receiver to perform channel estimation.
  • the frequency resource of the excitation signal is divided into multiple parts.
  • the figure shows a situation where the frequency resource is divided into 4 subcarriers, and the middle two subcarriers are used to transmit the first subcarrier.
  • a reference signal is used for channel estimation at the receiving end, and the other part is used for communication with other reflectors using precoding information.
  • the precoding information in the figure is the product of the precoding vector and the reference signal.
  • the two subcarriers in the middle of the excitation signal can be used to send the reference signal in any of the manners shown in (a) or (b) of FIG. 5, which is not specifically limited in the embodiment of the present application.
  • the figure only shows a schematic diagram of the exciter containing two ports, but this should not cause any limitation to the application. In actual operations, the exciter may contain more ports.
  • Fig. 6 is a time-frequency structure diagram of a second excitation signal in an embodiment of the present application.
  • the second excitation signal may include the precoding information of the antenna ports and the respective corresponding second reference signals, and each antenna port may transmit according to the respective precoding information and/or the second reference signal.
  • the second reference signal corresponding to each antenna port can be the same reference signal. For example, s 1,1 of exciter port 1 is multiplied by m 1 in Fig. 6, correspondingly, s 2,1 of exciter port 2 is also Multiply by m 1 .
  • the figure only shows a schematic diagram of the exciter containing two ports, but this should not cause any limitation to the application. In actual operations, the exciter may contain more ports.
  • FIG. 7 is a schematic diagram of the time structure of an excitation signal in an embodiment of the present application.
  • the excitation signal includes K OFDM symbols in the time dimension, and each OFDM symbol corresponds to a respective precoding vector S.
  • FIG. 8 is a schematic diagram of the time structure of the reflected signal in an embodiment of the present application.
  • the reflected data symbol is composed of a precoding vector and data, and there are gaps between L data symbols.
  • Fig. 9 is a schematic diagram of a receiver of an embodiment of the present application.
  • the receiver 900 includes at least a receiving module 910, a processing module 920, and a sending module 930.
  • the receiving module 910 is used for receiving the first reference signal reflected by the reflector during the process of sending the first excitation signal by the exciter;
  • the processing module 920 is used for controlling the exciter and the reflector according to the first reference signal.
  • the channel between the reflector and the receiver is estimated to obtain the precoding information; the sending module 930 is used to send the precoding information to the exciter; the receiving module 910 is also used in the exciter In the process of sending the second excitation signal, the data signal reflected by the reflector is received, and the second excitation signal is determined according to the signal modulated by the precoding information.
  • the receiver performs channel estimation on each channel of the reflection communication according to the first reference signal to obtain precoding information, and the exciter receives and modulates the precoding information fed back by the receiver.
  • This solution can reduce Reflect the interference between communication channels and improve the performance of the data received by the receiving end.
  • the precoding information may be pre-modulation information sent by each antenna port of the exciter, or precoding information sent by each antenna port of the exciter, or between signals sent by each antenna port of the exciter. Phase difference and/or amplitude difference information.
  • the first reference signal may be predefined by the system or configured by the exciter.
  • the receiver receives the data signal and/or the second reference signal reflected by the reflector, and the second excitation signal is an excitation generated based on the precoding information. signal.
  • the second excitation signal may also be determined according to a second reference signal corresponding to each of the multiple antenna ports, and the second reference signals corresponding to each of the multiple antenna ports are the same reference signal.
  • the second reference signals corresponding to the multiple antenna ports may also be different reference signals.
  • the second reference signal may be predefined by the system or configured by the exciter.
  • the receiving module 910 is further configured to receive the data signal and/or the third reference signal reflected by the reflector during the process of sending the second excitation signal by the exciter, where the second excitation signal includes the precoding information modulation signal.
  • the modulation mode can be any of QPSK, 16QAM, 64QAM, 256QAM and 1024QAM.
  • the exciter directly modulates the precoding information and sends it, which is beneficial to improve the performance of the reflection communication system.
  • using the first reference signal for the receiver to obtain precoding information includes: the receiver estimates the cascaded channel between the exciter-reflector-receiver according to the first reference signal, To get precoding information.
  • the receiver may also estimate the channel between the exciter and the reflector and the channel between the reflector and the receiver according to the first reference signal to obtain precoding information.
  • the first excitation signal includes excitation signals corresponding to the multiple antenna ports, and the excitation signals corresponding to the multiple antenna ports are mutually orthogonal or quasi-orthogonal.
  • Fig. 10 is a schematic diagram of an exciter according to an embodiment of the present application.
  • the exciter 1000 includes at least a sending module 1010 and a receiving module 1020.
  • the sending module 1010 is used to send a first excitation signal, and the first excitation signal is used to provide the reflector with energy and information carrier for reflecting the first reference signal to the receiver, and the first reference signal is used for the receiver to obtain Precoding information;
  • the receiving module 1020 is used to receive the precoding information from the receiver;
  • the sending module 1010 is also used to send a second excitation signal, the second excitation signal includes a signal modulated by the precoding information, the The second excitation signal is used to provide the reflector with energy and information carrier for reflecting the data signal to the receiver.
  • the interference between reflected communication channels can be reduced, and the performance of the data received by the receiving end can be improved.
  • the precoding information may be pre-modulation information sent by each antenna port of the exciter, or precoding information sent by each antenna port of the exciter, or between signals sent by each antenna port of the exciter. Phase difference and/or amplitude difference information.
  • the first reference signal may be predefined by the system or configured by the exciter.
  • start time and time length of sending the first excitation signal and the second excitation signal are configured by the controller.
  • the second excitation signal may also be determined according to a second reference signal corresponding to each of the multiple antenna ports, and the second reference signals corresponding to each of the multiple antenna ports are the same reference signal.
  • the exciter may send the product of the precoding information modulation signal and the second reference signal.
  • the second reference signals corresponding to each of the multiple antenna ports may also be different reference signals.
  • the second reference signal may be predefined by the system or configured by the exciter.
  • the signal modulated by the precoding information includes a signal modulated by the precoding information through any one of the following modulation modes: QPSK, 16QAM, 64QAM, 256QAM, and 1024QAM.
  • the exciter directly modulates the precoding information and sends it, which is beneficial to improve the performance of the reflection communication system.
  • using the first reference signal for the receiver to obtain precoding information includes: the receiver estimates the cascaded channel between the exciter-reflector-receiver according to the first reference signal, To get precoding information.
  • the receiver may also estimate the channel between the exciter and the reflector and the channel between the reflector and the receiver according to the first reference signal to obtain precoding information.
  • the first excitation signal includes excitation signals corresponding to the multiple antenna ports, and the excitation signals corresponding to the multiple antenna ports are mutually orthogonal or quasi-orthogonal.
  • Fig. 11 is a schematic diagram of a reflector according to an embodiment of the present application.
  • the reflector 1100 may include a first receiving module 1110, a first reflecting module 1120, a second receiving module 1130 and a second reflecting module 1140.
  • the first receiving module 1110 is used to receive the first excitation signal sent by the exciter, and the first excitation signal is used to provide the reflector with energy and information carrier for reflecting the first reference signal to the receiver;
  • the first reflection module 1120 is used for reflecting the first reference signal to the receiver according to the first excitation signal during the process of the exciter sending the first excitation signal, and the first reference signal is used for the receiver to obtain precoding information;
  • the second receiving module 1130 Used to receive the second excitation signal sent by the exciter, and the second excitation signal is used to provide the reflector with energy and information carrier for reflecting the data signal to the receiver;
  • the second reflection module 1140 is used in the During the process of sending the second excitation signal by the exciter, the data signal is reflected to the receiver according to the second excitation signal, and the second excitation signal includes the signal modulated by the precoding information.
  • the interference between reflected communication channels can be reduced, and the performance of the data received by the receiving end can be improved.
  • the first receiving module and the second receiving module may be the same module; the first reflection module and the second reflection module may be the same module.
  • the first reference signal may be predefined by the system or configured by the exciter.
  • the reflector reflects the data signal and/or the second reference signal, and the second excitation signal is an excitation signal generated based on the precoding information.
  • the second excitation signal may also be determined according to a second reference signal corresponding to each of the multiple antenna ports, and the second reference signals corresponding to each of the multiple antenna ports are the same reference signal.
  • the second reference signal may be predefined by the system or configured by the exciter.
  • the second reflection module is used to reflect the data signal and/or the third reference signal during the process of sending the second excitation signal by the exciter.
  • the second excitation signal includes the signal modulated by the precoding information, and the modulation method can be It is any one of QPSK, 16QAM, 64QAM, 256QAM, and 1024QAM.
  • the exciter directly modulates the precoding information and sends it, which is beneficial to improve the performance of the reflection communication system.
  • the first reference signal is used by the receiver to obtain precoding information, including: the receiver estimates the cascaded channel between the exciter-reflector-receiver according to the first reference signal to Get precoding information.
  • the receiver may also estimate the channel between the exciter and the reflector and the channel between the reflector and the receiver according to the first reference signal to obtain precoding information.
  • the first excitation signal includes excitation signals corresponding to the multiple antenna ports, and the excitation signals corresponding to the multiple antenna ports are mutually orthogonal or quasi-orthogonal.
  • the disclosed system, device, and method can be implemented in other ways.
  • the device embodiments described above are merely illustrative, for example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solution of the present application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disk or optical disk and other media that can store program code .

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Abstract

La présente invention concerne un procédé de communication par rétrodiffusion, un dispositif d'excitation, un réflecteur et un récepteur. Le procédé comprend : un dispositif d'excitation qui envoie un premier signal d'excitation, le premier signal d'excitation étant utilisé pour fournir au réflecteur de l'énergie et un support d'informations utilisés pour réfléchir un premier signal de référence vers un récepteur, le premier signal de référence étant utilisé par le récepteur pour acquérir des informations de pré-codage ; le dispositif d'excitation qui reçoit les informations de pré-codage ; le dispositif d'excitation qui envoie un second signal d'excitation, le second signal d'excitation comprenant un signal modulé par les informations de pré-codage, et le second signal d'excitation étant utilisé pour fournir au réflecteur de l'énergie et un support d'informations utilisés pour réfléchir un signal de données vers le récepteur. Au moyen du procédé de communication par rétrodiffusion de la présente demande, l'interférence entre des canaux de communication par rétrodiffusion est réduite, et l'efficacité de réception de données au moyen d'une extrémité de réception pendant une communication par rétrodiffusion peut ainsi être améliorée.
PCT/CN2019/125920 2019-12-17 2019-12-17 Procédé de communication par rétrodiffusion, dispositif d'excitation, réflecteur et récepteur WO2021119987A1 (fr)

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