WO2021119987A1 - Backscatter communication method, exciter, reflector and receiver - Google Patents

Backscatter communication method, exciter, reflector and receiver 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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WIPO (PCT)
Prior art keywords
signal
receiver
excitation
exciter
reflector
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PCT/CN2019/125920
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French (fr)
Chinese (zh)
Inventor
颜矛
高宽栋
黄煌
邵华
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华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201980102391.9A priority Critical patent/CN114731498A/en
Priority to PCT/CN2019/125920 priority patent/WO2021119987A1/en
Publication of WO2021119987A1 publication Critical patent/WO2021119987A1/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • H04B7/0452Multi-user MIMO systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W4/00Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/80Services 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

Provided are a backscatter communication method, an exciter, a reflector and a receiver. The method comprises: an exciter sending a first excitation signal, wherein the first excitation signal is used for providing a reflector with an energy and information carrier used for reflecting a first reference signal to a receiver, and the first reference signal is used by the receiver to acquire pre-coding information; the exciter receiving the pre-coding information; and the exciter sending a second excitation signal, wherein the second excitation signal comprises a signal modulated by the pre-coding information, and the second excitation signal is used for providing the reflector with an energy and information carrier used for reflecting a data signal to the receiver. By means of the backscatter communication method of the present application, the interference between backscatter communication channels is reduced, and the performance of receiving data by means of a receiving end during backscatter communication can thus be improved.

Description

反射通信方法、激励器、反射器和接收器Reflection communication method, exciter, reflector and receiver 技术领域Technical field
本申请涉及通信领域,并且更具体地,涉及一种反射通信方法、激励器、反射器和接收器。The present application relates to the field of communication, and more specifically, to a reflection communication method, exciter, reflector, and receiver.
背景技术Background technique
在反射通信中,反射器一般会针对激励器的激励信号进行反射,并在反射时承载数据。In reflection communication, the reflector generally reflects the excitation signal of the exciter and carries data during reflection.
多输入多输出(multiple input multiple output,MIMO)技术能够提高通信系统的传输性能和效率,为提高反射通信的系统性能,将MIMO中的多天线预编码技术应用在反射通信中时,传统激励器无法识别当前的多天线预编码技术,且当前的多天线预编码技术处理过程复杂,应用在反射通信中时,接收端接收的数据不一定准确。The multiple input multiple output (MIMO) technology can improve the transmission performance and efficiency of the communication system. In order to improve the system performance of the reflection communication, when the multi-antenna precoding technology in MIMO is applied to the reflection communication, 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. When it is applied in reflection communication, the data received by the receiving end may not be accurate.
发明内容Summary of the invention
本申请提供一种反射通信方法、激励器、反射器和接收器,能够提高反射通信接收数据的性能。The present application provides a reflection communication method, exciter, reflector and receiver, which can improve the performance of reflection communication to receive data.
第一方面,提供了一种反射通信方法,该方法包括:激励器发送第一激励信号,该第一激励信号用于向反射器提供用于向接收器反射第一参考信号的能量和信息载体,该第一参考信号用于该接收器获取预编码信息;该激励器从该接收器接收该预编码信息;该激励器发送第二激励信号,该第二激励信号包括该预编码信息调制后的信号,该第二激励信号用于向反射器提供用于向该接收器反射数据信号的能量和信息载体。In a first aspect, a reflection communication method is provided, the 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.
基于上述技术方案,可以减小反射通信信道之间的干扰,提升接收端接收的数据的性能。Based on the above technical solution, the interference between reflected communication channels can be reduced, and the performance of the data received by the receiving end can be improved.
可选地,该预编码信息可以是激励器各个天线端口分别发送的预调制信息,也可以是激励器各个天线端口分别发送的预编码信息,也可以是激励器各个天线端口发送信号之间的相位差和/或幅度差信息等。Optionally, 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.
可选地,该第一参考信号可以是系统预定义的或者是激励器配置的。Optionally, the first reference signal may be predefined by the system or configured by the exciter.
可选地,发送第一激励信号和第二激励信号的起始时间和时间长度由控制器配置。Optionally, the start time and time length of sending the first excitation signal and the second excitation signal are configured by the controller.
结合第一方面,在第一方面的一些实现方式中,该第二激励信号是根据多个天线端口各自对应的第二参考信号确定的,该多个天线端口各自对应的第二参考信号为相同的参考信号。With reference to the first aspect, in some implementations of the first aspect, 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.
该技术方案中,避免了激励信号发送的多个信号之间发生相同的干扰,有利于接收器进行数据信号的解调,从而能够提升反射通信的系统性能。In this technical solution, the same interference between multiple signals sent by the excitation signal is avoided, which facilitates the demodulation of the data signal by the receiver, thereby improving the performance of the reflection communication system.
可选地,激励器可以将该预编码信息调制信号与该第二参考信号的乘积发送,该第二参考信号可以是系统预定义的或者是激励器配置的,也可以是预设方式形成的序列。Optionally, 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.
可选地,该多个天线端口各自对应的第二参考信号也可以是不同的参考信号。Optionally, the second reference signals corresponding to each of the multiple antenna ports may also be different reference signals.
结合第一方面,在第一方面的一些实现方式中,该预编码信息调制后的信号包括该预编码信息经过以下任意一种调制方式调制后的信号:可以是正交相移键控(quadrature phase shift keying,QPSK)、也可以是正交振幅调制(quadrature amplitude modulation,QAM),如16QAM、64QAM、256QAM和1024QAM。With reference to the first aspect, in some implementation manners of the first aspect, 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.
该技术方案中,激励器直接将预编码信息调制后发送,有利于提升反射通信的系统性能。In this technical solution, the exciter directly modulates the precoding information and sends it, which is beneficial to improve the performance of the reflection communication system.
结合第一方面,在第一方面的一些实现方式中,该第一参考信号用于该接收器获取预编码信息,包括:该接收器根据该第一参考信号,对该激励器-反射器-接收器之间的级联信道进行估计,以获取预编码信息。With reference to the first aspect, in some implementations of the first aspect, 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.
可选地,该接收器还可以根据该第一参考信号,对该激励器和该反射器之间的信道以及该反射器和该接收器之间的信道进行估计,以获取该预编码信息。Optionally, 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.
结合第一方面,在第一方面的一些实现方式中,该第一激励信号包括多个天线端口对应的激励信号,该多个天线端口对应的激励信号相互正交或准正交。With reference to the first aspect, in some implementations of the first aspect, 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.
该技术方案中,当多个天线端口对应的激励信号相互正交或准正交时,有利于接收器进行信道估计。In this technical solution, when 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.
第二方面,提供一种反射通信方法,该方法包括:反射器接收激励器发送的第一激励信号,该第一激励信号用于向反射器提供用于向接收器反射第一参考信号的能量和信息载体;根据该第一激励信号,反射器向所述接收器反射该第一参考信号,该第一参考信号用于该接收器获取预编码信息;反射器接收激励器发送的第二激励信号,该第二激励信号用于向反射器提供用于向该接收器反射数据信号的能量和信息载体;根据该第二激励信号,该反射器向该接收器反射数据信号,该第二激励信号包括预编码信息调制后的信号。In a second aspect, a reflection communication method is provided, the 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.
基于上述技术方案,可以减小反射通信信道之间的干扰,提升接收端接收的数据的性能。Based on the above technical solution, the interference between reflected communication channels can be reduced, and the performance of the data received by the receiving end can be improved.
可选地,该预编码信息可以是激励器各个天线端口分别发送的预调制信息,也可以是激励器各个天线端口分别发送的预编码信息,也可以是激励器各个天线端口发送信号之间的相位差和/或幅度差信息。Optionally, 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.
可选地,该第一参考信号可以是系统预定义的或者是激励器配置的。Optionally, the first reference signal may be predefined by the system or configured by the exciter.
结合第二方面,在第二方面的一些实现方式中,该第二激励信号是根据所述多个天线端口各自对应的第二参考信号确定的,该多个天线端口各自对应的第二参考信号为相同的参考信号。With reference to the second aspect, in some implementations of the second aspect, 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.
该技术方案中,避免了激励信号多个信号之间发生相同的干扰,有利于提升反射通信的系统性能。In this technical solution, the same interference between multiple signals of the excitation signal is avoided, which is beneficial to improve the performance of the reflection communication system.
可选地,该第二参考信号可以是系统预定义的或者是激励器配置的。Optionally, the second reference signal may be predefined by the system or configured by the exciter.
可选地,当第二激励信号中包括多个天线端口各自对应的第二参考信号时,反射器反射数据信号和/或第三参考信号,有利于接收端进行数据信号的解调。Optionally, when the second excitation signal includes the second reference signal corresponding to each of the multiple antenna ports, the reflector reflects the data signal and/or the third reference signal, which facilitates the demodulation of the data signal by the receiving end.
结合第二方面,在第二方面的一些实现方式中,该预编码信息调制后的信号包括该预编码信息经过以下任意一种调制方式调制后的信号:QPSK、16QAM、64QAM、256QAM和1024QAM。With reference to the second aspect, in some implementation manners of the second aspect, 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.
该技术方案中,激励器直接将预编码信息调制后发送,有利于提升反射通信的系统性 能。In this technical solution, the exciter directly modulates the precoding information and sends it, which is beneficial to improve the performance of the reflection communication system.
结合第二方面,在第二方面的一些实现方式中,该第一参考信号用于该接收器获取预编码信息,包括:该接收器根据该第一参考信号,对该激励器-反射器-接收器之间的级联信道进行估计,以获取预编码信息。With reference to the second aspect, in some implementations of the second aspect, 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.
可选地,该接收器还可以根据该第一参考信号,对该激励器和该反射器之间的信道以及该反射器和该接收器之间的信道进行估计,以获取该预编码信息。Optionally, 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.
结合第二方面,在第二方面的一些实现方式中,该第一激励信号包括该多个天线端口对应的激励信号,该多个天线端口对应的激励信号相互正交或准正交。With reference to the second aspect, in some implementations of the second aspect, 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.
该技术方案中,当多个天线端口对应的激励信号相互正交或准正交时,有利于接收器进行信道估计。In this technical solution, when 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.
第三方面,提供了一种反射通信方法,该方法包括:接收器接收反射器根据第一激励信号反射的第一参考信号;该接收器根据该第一参考信号,获取预编码信息;该接收器向该激励器发送该预编码信息;该接收器接收该反射器根据第二激励信号反射的数据信号,该第二激励信号根据预编码信息调制后的信号确定。In a third aspect, a reflection communication method is provided. The 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.
该技术方案中,接收器根据第一参考信号,获取预编码信息,激励器接收并调制接收器反馈的该预编码信息,该方案可以减小反射通信信道之间的干扰,提升接收端接收的数据的性能。In this technical solution, 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.
可选地,该第一参考信号可以是系统预定义的或者是激励器配置的。Optionally, the first reference signal may be predefined by the system or configured by the exciter.
可选地,在激励器发送第二激励信号的过程中,该接收器接收该反射器反射的数据信号和/或第三参考信号,该第二激励信号包括预编码信息调制后的信号。Optionally, during the process of the exciter sending the second excitation signal, 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.
该第三参考信号有利于该接收器解调反射器的数据信号。The third reference signal facilitates the receiver to demodulate the data signal of the reflector.
结合第三方面,在第三方面的一些实现方式中,该第二激励信号是根据多个天线端口各自对应的第二参考信号确定的,所述多个天线端口各自对应的第二参考信号为相同的参考信号。With reference to the third aspect, in some implementations of the third aspect, 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.
该技术方案中,避免了激励信号发送的多个信号之间发生相同的干扰,有利于接收器进行数据信号的解调,从而能够提升反射通信的系统性能。In this technical solution, the same interference between multiple signals sent by the excitation signal is avoided, which facilitates the demodulation of the data signal by the receiver, thereby improving the performance of the reflection communication system.
可选地,该第二参考信号可以是系统预定义的或者是激励器配置的。Optionally, the second reference signal may be predefined by the system or configured by the exciter.
可选地,该多个天线端口各自对应的第二参考信号也可以是不同的参考信号。Optionally, the second reference signals corresponding to each of the multiple antenna ports may also be different reference signals.
结合第三方面,在第三方面的一些实现方式中,该预编码信息调制后的信号包括该预编码信息经过以下任意一种调制方式调制后的信号:QPSK、16QAM、64QAM、256QAM和1024QAM。With reference to the third aspect, in some implementation manners of the third aspect, 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.
该技术方案中,激励器直接将预编码信息调制后发送,有利于提升反射通信的系统性能。In this technical solution, the exciter directly modulates the precoding information and sends it, which is beneficial to improve the performance of the reflection communication system.
结合第三方面,在第三方面的一些实现方式中,该第一参考信号用于该接收器获取预编码信息,包括:该接收器根据该第一参考信号,对该激励器-反射器-接收器之间的级联信道进行估计,以获取预编码信息。With reference to the third aspect, in some implementations of the third aspect, 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.
可选地,该接收器还可以根据该第一参考信号,对该激励器和该反射器之间的信道以及该反射器和该接收器之间的信道进行估计,以获取预编码信息。Optionally, 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.
结合第三方面,在第三方面的一些实现方式中,该第一激励信号包括多个天线端口对 应的激励信号,该多个天线端口对应的激励信号相互正交或准正交。With reference to the third aspect, in some implementations of the third aspect, 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.
该技术方案中,当多个天线端口对应的激励信号相互正交或准正交时,有利于接收器进行信道估计。In this technical solution, when 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.
第四方面,提供一种激励器,该激励器包括:发送模块,用于发送第一激励信号,该第一激励信号用于向反射器提供用于向接收器反射第一参考信号的能量和信息载体,该第一参考信号用于该接收器获取预编码信息;接收模块,用于从该接收器接收该预编码信息;该发送模块还用于发送第二激励信号,该第二激励信号包括该预编码信息调制后的信号,该第二激励信号用于向反射器提供用于向该接收器反射数据信号的能量和信息载体。In a fourth aspect, an exciter is provided, the exciter 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.
基于上述技术方案,可以减小反射通信信道之间的干扰,提升接收端接收的数据的性能。Based on the above technical solution, the interference between reflected communication channels can be reduced, and the performance of the data received by the receiving end can be improved.
可选地,该预编码信息可以是激励器各个天线端口分别发送的预调制信息,也可以是激励器各个天线端口分别发送的预编码信息,也可以是激励器各个天线端口发送信号之间的相位差和/或幅度差信息。Optionally, 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.
可选地,该第一参考信号可以是系统预定义的或者是激励器配置的。Optionally, the first reference signal may be predefined by the system or configured by the exciter.
可选地,发送第一激励信号和第二激励信号的起始时间和时间长度由控制器配置。Optionally, the start time and time length of sending the first excitation signal and the second excitation signal are configured by the controller.
结合第四方面,在第四方面的一些实现方式中,该第二激励信号是根据所述多个天线端口各自对应的第二参考信号确定,该多个天线端口各自对应的第二参考信号为相同的参考信号。With reference to the fourth aspect, in some implementations of the fourth aspect, 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.
该技术方案中,避免了激励信号发送的多个信号之间发生相同的干扰,有利于接收器进行数据信号的解调,从而能够提升反射通信的系统性能。In this technical solution, the same interference between multiple signals sent by the excitation signal is avoided, which facilitates the demodulation of the data signal by the receiver, thereby improving the performance of the reflection communication system.
可选地,激励器可以将该预编码信息调制信号与该第二参考信号的乘积发送。Optionally, the exciter may send the product of the precoding information modulation signal and the second reference signal.
可选地,该多个天线端口各自对应的第二参考信号也可以是不同的参考信号。Optionally, the second reference signals corresponding to each of the multiple antenna ports may also be different reference signals.
可选地,该第二参考信号可以是系统预定义的或者是激励器配置的。Optionally, the second reference signal may be predefined by the system or configured by the exciter.
结合第四方面,在第四方面的一些实现方式中,该预编码信息调制后的信号包括该预编码信息经过以下任意一种调制方式调制后的信号:QPSK、16QAM、64QAM、256QAM和1024QAM。With reference to the fourth aspect, in some implementation manners of the fourth aspect, 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.
该技术方案中,激励器直接将预编码信息调制后发送,有利于提升反射通信的系统性能。In this technical solution, the exciter directly modulates the precoding information and sends it, which is beneficial to improve the performance of the reflection communication system.
结合第四方面,在第四方面的一些实现方式中,该第一参考信号用于该接收器获取预编码信息,包括:该接收器根据该第一参考信号,对该激励器-反射器-接收器之间的级联信道进行估计,以获取预编码信息。With reference to the fourth aspect, in some implementation manners of the fourth aspect, 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.
可选地,该接收器还可以根据该第一参考信号,对该激励器和该反射器之间的信道以及该反射器和该接收器之间的信道进行估计,以获取预编码信息。Optionally, 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.
结合第四方面,在第四方面的一些实现方式中,该第一激励信号包括所述多个天线端口对应的激励信号,所述多个天线端口对应的激励信号相互正交或准正交。With reference to the fourth aspect, in some implementations of the fourth aspect, 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.
该技术方案中,当多个天线端口对应的激励信号相互正交或准正交时,有利于接收器进行信道估计。In this technical solution, when 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.
第五方面,提供一种反射器,该反射器包括:第一接收模块,用于接收激励器发送的第一激励信号,该第一激励信号用于向反射器提供用于向接收器反射第一参考信号的能量 和信息载体;第一反射模块,用于根据该第一激励信号,向该接收器反射第一参考信号,该第一参考信号用于该接收器获取预编码信息;第二接收模块,用于接收激励器发送的第二激励信号,该第二激励信号用于向反射器提供用于向该接收器反射数据信号的能量和信息载体;第二反射模块,用于根据该第二激励信号,向该接收器反射数据信号,该第二激励信号包括预编码信息调制后的信号。In a fifth aspect, a reflector is provided. The reflector 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; second 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.
基于上述技术方案,可以减小反射通信信道之间的干扰,提升接收端接收的数据的性能。Based on the above technical solution, the interference between reflected communication channels can be reduced, and the performance of the data received by the receiving end can be improved.
可选地,该第一接收模块与该第二接收模块可以是同一个模块;该第一反射模块与该第二反射模块可以是同一个模块。Optionally, 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.
可选地,该第一参考信号可以是系统预定义的或者是激励器配置的。Optionally, the first reference signal may be predefined by the system or configured by the exciter.
结合第五方面,在第五方面的一些实现方式中,该第二激励信号是根据该多个天线端口各自对应的第二参考信号确定的,该多个天线端口各自对应的第二参考信号是相同的参考信号。With reference to the fifth aspect, in some implementations of the fifth aspect, 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.
该技术方案中,避免了激励信号发送的多个信号之间发生相同的干扰,有利于接收器进行数据信号的解调,从而能够提升反射通信的系统性能。In this technical solution, the same interference between multiple signals sent by the excitation signal is avoided, which facilitates the demodulation of the data signal by the receiver, thereby improving the performance of the reflection communication system.
可选地,该第二参考信号可以是系统预定义的或者是激励器配置的。Optionally, the second reference signal may be predefined by the system or configured by the exciter.
结合第五方面,在第五方面的一些实现方式中,该预编码信息调制后的信号包括该预编码信息经过以下任意一种调制方式调制后的信号:QPSK、16QAM、64QAM、256QAM和1024QAM。With reference to the fifth aspect, in some implementation manners of the fifth aspect, 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.
该技术方案中,激励器直接将预编码信息调制后发送,有利于提升反射通信的系统性能。In this technical solution, the exciter directly modulates the precoding information and sends it, which is beneficial to improve the performance of the reflection communication system.
结合第五方面,在第五方面的一些实现方式中,该第一参考信号用于接收器获取预编码信息,包括:该接收器根据该第一参考信号,对该激励器-反射器-接收器之间的级联信道进行估计,以获取预编码信息。With reference to the fifth aspect, in some implementation manners of the fifth aspect, 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.
可选地,接收器根据该第一参考信号,对该激励器和该反射器之间的信道以及该反射器和该接收器之间的信道进行估计,以获取预编码信息。Optionally, 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.
结合第五方面,在第五方面的一些实现方式中,该第一激励信号包括该多个天线端口对应的激励信号,该多个天线端口对应的激励信号相互正交或准正交。With reference to the fifth aspect, in some implementations of the fifth aspect, 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.
该技术方案中,当多个天线端口对应的激励信号相互正交或准正交时,有利于接收器进行信道估计。In this technical solution, when 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.
第六方面,提供一种接收器,该接收器包括:接收模块,用于在激励器发送第一激励信号的过程中,接收反射器反射的第一参考信号;处理模块,用于根据该第一参考信号,获取预编码信息;发送模块,用于向激励器发送该预编码信息;该接收模块还用于在激励器发送第二激励信号的过程中,接收该反射器反射的数据信号,该第二激励信号根据该预编码信息调制后的信号确定。In a sixth aspect, a receiver is provided. The receiver 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.
该技术方案中,接收器根据第一参考信号,获取预编码信息,激励器接收并调制接收器反馈的该预编码信息,该方案可以减小反射通信信道之间的干扰,提升接收端接收的数据的性能。In this technical solution, 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.
可选地,该预编码信息可以是激励器各个天线端口分别发送的预调制信息,也可以是 激励器各个天线端口分别发送的预编码信息,也可以是激励器各个天线端口发送信号之间的相位差和/或幅度差信息等。Optionally, 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.
可选地,该第一参考信号可以是系统预定义的或者是激励器配置的。Optionally, the first reference signal may be predefined by the system or configured by the exciter.
可选地,在激励器发送第二激励信号的过程中,该接收器接收该反射器反射的数据信号和/或第二参考信号,该第二激励信号是基于该预编码信息生成得到的激励信号。Optionally, during the process of the exciter sending the second excitation signal, 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.
结合第六方面,在第六方面的一些实现方式中,该第二激励信号是根据多个天线端口各自对应的第二参考信号确定的,该多个天线端口各自对应的第二参考信号为相同的参考信号。With reference to the sixth aspect, in some implementations of the sixth aspect, 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.
该技术方案中,避免了激励信号发送的多个信号之间发生相同的干扰,有利于接收器进行数据信号的解调,从而能够提升反射通信的系统性能。In this technical solution, the same interference between multiple signals sent by the excitation signal is avoided, which facilitates the demodulation of the data signal by the receiver, thereby improving the performance of the reflection communication system.
可选地,该第二参考信号可以是系统预定义的或者是激励器配置的。Optionally, the second reference signal may be predefined by the system or configured by the exciter.
结合第六方面,在第六方面的一些实现方式中,该预编码信息调制后的信号包括该预编码信息经过以下任意一种调制方式调制后的信号:QPSK、16QAM、64QAM、256QAM和1024QAM。With reference to the sixth aspect, in some implementation manners of the sixth aspect, 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.
该技术方案中,激励器直接将预编码信息调制后发送,有利于提升反射通信的系统性能。In this technical solution, the exciter directly modulates the precoding information and sends it, which is beneficial to improve the performance of the reflection communication system.
结合第六方面,在第六方面的一些实现方式中,该第一参考信号用于该接收器获取预编码信息,包括:该接收器根据该第一参考信号,对该激励器-反射器-接收器之间的级联信道进行估计,以获取预编码信息。With reference to the sixth aspect, in some implementations of the sixth aspect, 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.
可选地,该接收器还可以根据该第一参考信号,对该激励器和该反射器之间的信道以及该反射器和该接收器之间的信道进行估计,以获取预编码信息。Optionally, 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.
结合第六方面,在第六方面的一些实现方式中,该第一激励信号包括所述多个天线端口对应的激励信号,所述多个天线端口对应的激励信号相互正交或准正交。With reference to the sixth aspect, in some implementations of the sixth aspect, 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.
该技术方案中,当多个天线端口对应的激励信号相互正交或准正交时,有利于接收器进行信道估计。In this technical solution, when 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.
第七方面,提供一种激励器,包括收发电路和处理电路,该处理电路用于利用该收发电路执行如第一方面所述的方法。In a seventh aspect, an exciter is provided, 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.
第八方面,提供一种反射器,包括收发电路和处理电路,该处理电路用于利用该收发电路执行如第二方面所述的方法。In an eighth aspect, a reflector is provided, 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.
第九方面,提供一种接收器,包括收发电路和处理电路,该处理电路用于利用该收发电路执行如第三方面所述的方法。In a ninth aspect, a receiver is provided, 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.
附图说明Description of the drawings
图1是本申请实施例的反射通信系统的示意性架构图。FIG. 1 is a schematic architecture diagram of a reflection communication system according to an embodiment of the present application.
图2是本申请实施例的反射通信的示意图。Fig. 2 is a schematic diagram of reflective communication in an embodiment of the present application.
图3是本申请实施例的反射通信的又一示意图。FIG. 3 is another schematic diagram of reflection communication according to an embodiment of the present application.
图4是本申请实施例的硬件结构示意图。Fig. 4 is a schematic diagram of the hardware structure of an embodiment of the present application.
图5是本申请实施例的第一激励信号的时频结构示意图。FIG. 5 is a schematic diagram of the time-frequency structure of the first excitation signal in an embodiment of the present application.
图6是本申请实施例的第二激励信号的时频结构示意图。FIG. 6 is a schematic diagram of a time-frequency structure of a second excitation signal according to an embodiment of the present application.
图7是本申请实施例的激励信号的时间结构示意图。FIG. 7 is a schematic diagram of the time structure of an excitation signal in an embodiment of the present application.
图8是本申请实施例的反射信号的时间结构示意图。FIG. 8 is a schematic diagram of the time structure of the reflected signal in an embodiment of the present application.
图9是本申请实施例的接收器的示意图。Fig. 9 is a schematic diagram of a receiver according to an embodiment of the present application.
图10是本申请实施例的激励器的示意图。Fig. 10 is a schematic diagram of an exciter according to an embodiment of the present application.
图11是本申请实施例的反射器的示意图。Fig. 11 is a schematic diagram of a reflector according to an embodiment of the present application.
具体实施方式Detailed ways
下面将结合附图,对本申请中的技术方案进行描述。The technical solution in this application will be described below in conjunction with the accompanying drawings.
本申请实施例的技术方案可以应用于当前或者未来任何采用反射通信技术的系统中。The technical solutions of the embodiments of the present application can be applied to any current or future system using reflection communication technology.
反射通信依靠反射天线端接收到的无线信号进行通信,适用于物联网应用的极低功耗、低成本的信息传输。图1示出了本申请实施例的一种反射通信系统的示意性架构图。如图1所示,该反射通信系统100至少包括激励器、反射器和接收器。Reflective communication relies on the wireless signal received by the reflective antenna to communicate, which is suitable for extremely low power consumption and low-cost information transmission in Internet of Things applications. Fig. 1 shows a schematic architecture diagram of a reflective communication system according to an embodiment of the present application. As shown in FIG. 1, the reflection communication system 100 at least includes an exciter, a reflector, and a receiver.
在图1中,激励器发送无线信号;反射器接收激励器的无线信号,并将信号反射;在反射时,反射器会将自身信号承载于反射信号上;接收器解调出承载于反射信号上的数据。根据反射器的工作模式或能力,分为无源(进行数据处理、反射时所需要的能量,通过无线信号获取)和半有源(即部分通信过程需要电池或其它途径供电)两种。无论无源和半有源,都通过在反射的无线信号上承载数据实现低功耗甚至无外接电源通信。In Figure 1, 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. According to 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.
本申请实施例中,根据激励器、接收器与现有LTE或NR网络的对应关系,可以有如下几种:激励器为用户设备(UE),接收器为基站;激励器为基站,接收器为用户设备;激励器和接收器都为用户设备;激励器和接收器都为基站。In the embodiments of the present application, according to the corresponding relationship between the exciter and the receiver and the existing LTE or NR network, there may be the following types: 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.
本申请实施例中,激励器、反射器和接收器中任意一个可以解释为:现有3GPP网络中的网络设备、终端设备(user equipment,UE)、物联网设备(internet of thing,IoT)、设备(device)中的任意一种;或者解释为RFID网络中的读写器(reader)、标签(tag);或者专用接收器(专用接收反射信号的设备,可以和网络设备相连,也可以直接连入蜂窝网络中);或者专用激励器(专用发送激励信号的设备,可以和网络设备相连,也可以直接连入蜂窝网络中)。同时,不排除将来协议定义新的设备类型/名称。In the embodiments of this application, 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). At the same time, it is not ruled out that the future agreement defines new device types/names.
本申请实施例中的终端设备可以指用户设备、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。终端设备还可以是蜂窝电话、无绳电话、会话启动协议(session initiation protocol,SIP)电话、无线本地环路(wireless local loop,WLL)站、个人数字处理(personal digital assistant,PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备,未来5G网络中的终端设备或者未来演进的公用陆地移动通信网络(public land mobile network,PLMN)中的终端设备等,本申请实施例对此并不限定。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.
本申请实施例中的网络设备可以是用于与终端设备通信的设备,该网络设备可以是全球移动通讯(global system of mobile communication,GSM)系统或码分多址(code division multiple access,CDMA)中的基站(base transceiver station,BTS),也可以是宽带码分多址(wideband code division multiple access,WCDMA)系统中的基站(nodeB,NB),还可以是LTE系统中的演进型基站(evolutional nodeB,eNB或eNodeB),还可以是云 无线接入网络(cloud radio access network,CRAN)场景下的无线控制器,或者该网络设备可以为中继站、接入点、车载设备、可穿戴设备以及未来5G网络中的网络设备或者未来演进的PLMN网络中的网络设备等,本申请实施例并不限定。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) 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, or 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.
激励器的其它可能称号:helper,询问器interrogator、读写器reader、用户设备(user equipment,UE);反射器的其它可能称号:反射设备(backscatter device),无源设备(battery-less device)、被动设备(passive device),半有源设备(semi-passive device),散射信号设备(ambient signal device),标签(tag)等。反射通信又称为:被动通信(passive communication),无源通信,散射通信(ambient communication)等。Other possible titles of 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.
如图1所示,该反向散射通信系统还可以包括控制器,在一种实现方式中,接收器为控制器,该控制器发送给激励器或接收器的激励信号配置信息和/或反射信号配置信息可以通过无线资源控制(radio resource control,RRC)信令,媒介接入控制-控制元素(medium access control-control element,MAC CE),媒介接入控制-协议数据单元(medium access control-protocol data unit,MAC-PDU),下行控制信息(downlink control information,DCI)、系统信息中的至少一项指示。发送给反射器的反射信号配置信息是通过激励器的反射链路控制信息、反射链路无线资源控制信息、反射链路媒介接入控制信息中的至少一个通知给反射器的。反射链路是指激励器到反射器之间的通信链路,或者是激励器到反射器到接收器之间的通信链路。As shown in Figure 1, the backscatter communication system may also include a controller. In one implementation, 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.
其中,激励信号配置信息包括但不限于:激励信号的频率、时间、子载波间隔、发送端口数、各个端口映射的信号以及频率和/或时间位置。反射信号配置信息包括但不限于:反射数据符号速率、反射起始时刻以及时间长度、反射数据比特时间宽度、反射数据比特速率。Wherein, 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.
应当可以理解,图1仅是示出了当激励器作为控制器的示意图,在一种实现方式中,激励器可以为控制器,其中激励信号和/或反射信号配置信息发送给接收器,以供接收器进行激励信号消除和/或反射信号解调。在一种实现方式中,第三方设备为控制器,其中激励信号和/或反射信号配置信息发送给接收器,以供接收器进行激励信号消除和/或反射信号解调,本申请实施例对此不做具体限定。It should be understood that FIG. 1 is only a schematic diagram showing when the exciter is used as a controller. In one implementation, 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. In an implementation manner, 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.
应当可以理解,在本申请实施例的一种实现方式中,该反向散射通信系统100中激励器和接收器可以集成为同一个节点,是同一个设备。例如,在射频标识(radio-frequency identification,RFID)系统中,激励器和接收器集成于同一个节点,被称为读写器。It should be understood that, in an implementation manner of the embodiment of the present application, the exciter and the receiver in the backscatter communication system 100 may be integrated into the same node and are the same device. For example, in a radio-frequency identification (RFID) system, the exciter and receiver are integrated in the same node, which is called a reader.
在RFID系统中,通信过程可以分为以下几个步骤:In the RFID system, the communication process can be divided into the following steps:
Step 1:发送连续波(continuous wave,CW)即单音信号/余弦信号/正弦信号,用于给反射器提供能量。Step 1: Send a continuous wave (CW), that is, a single tone signal/cosine signal/sine signal to provide energy to the reflector.
Step 2:读写器发送振幅键控(amplitude-shift keying,ASK)信号,用于给反射器充电和发送控制信息,与此同时,被激活的反射器对读写器的ASK进行解调,获取控制信息,然后在Step 3并进行相应的操作。Step 2: The reader sends an amplitude-shift keying (ASK) signal to charge the reflector and send control information. At the same time, the activated reflector demodulates the ASK of the reader, Obtain the control information, and then perform corresponding operations in Step 3.
Step 3:读写器持续发送连续波,用于给反射器提供能量和信息载体;反射器根据读写器的控制信息,反射数据信号;读写器在发送连续波激励信号的同时,接收信号,并尝试解调反射数据。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:读写器对反射器的读或写过程,可以经过多次Step 1至Step 3,直到目标操 作完成。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.
激励器发送的激励信号有两个作用:充电和充当反射数据载体,即为反射器提供能量和信息载体。也就是说,反射器在反射信号时,依靠激励信号供电并将自身数据信号承载在激励信号中。从所占据频带宽度的角度来看,激励器发送的信号,可以为单音信号(即连续的正弦波)或单载波信号,也可以为多音信号(例如,具有一定带宽的信号)。一般来说,激励器发送的信号为已知信号,或者为发送给接收器的数据信号。在RFID系统中,读写器(发送激励信号)发送的为单音信号,又称为连续波(continuous wave,CW),不承载任何数据。而RFID反射数据时,原始数据直接承载于信号中。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. In other words, when the reflector reflects the signal, it relies on the excitation signal for power supply and carries its own data signal in the excitation signal. From the perspective of the occupied bandwidth, 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). Generally speaking, the signal sent by the exciter is a known signal or a data signal sent to the receiver. In the RFID system, the reader (sending excitation signal) sends a single tone signal, also known as continuous wave (CW), and does not carry any data. When RFID reflects data, the original data is directly carried in the signal.
蜂窝网中的多输入多输出(multiple input multiple output,MIMO)技术,即多天线技术分为下行和上行。在MIMO上行过程中,基站通过发送预编码矩阵指示符(transmitted precoding matrix indicator,TPMI)告诉终端进行发送操作,且预编码公式比较复杂。在MIMO下行过程中,预编码矩阵W=W1*W2,其中W1表示L个正交波束预编码(一般采取DFT矩阵,为均匀幅度),W2为L个波束的合并,一般采取正交相移键控(quadrature phase shift keying,QPSK)或者8-PSK进行量化处理,通过两级编码,可实现非均匀的预编码使得不同空间信道分量具有不同的权值。The multiple input multiple output (MIMO) technology in the cellular network, that is, the multiple antenna technology is divided into downlink and uplink. In the 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. In the MIMO downlink process, the precoding matrix W=W1*W2, where 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.
为提高反射通信的系统性能,将MIMO应用在反射通信中时,会出现信道之间存在干扰,导致反射通信系统的接收端接收的数据不准确等问题。In order to improve the performance of the reflective communication system, when MIMO is applied to the reflective communication, there will be interference between channels, resulting in problems such as inaccurate data received by the receiving end of the reflective communication system.
本申请实施例通过基于反馈的多天线激励方法,减小了信道之间的干扰,且能够提高反射通信中接收端接收数据的性能。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.
下面将结合图2描述本申请实施例的反射通信的方法。图2是本申请实施例的一种反射通信的示意图。如图2所示,该方法200包括步骤S210至步骤S230。The reflective communication method of the embodiment of the present application will be described below in conjunction with FIG. 2. 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.
步骤S210,激励器发送第一激励信号,该第一激励信号用于反射器向接收器反射第一参考信号,该第一参考信号用于该接收器获取预编码信息。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.
该第一参考信号可以是激励器配置的,也可以是系统预定义的。The first reference signal may be configured by the exciter, or may be predefined by the system.
该第一参考信号可以是解调参考信号(demodulation reference signal,DMRS)、信道状态信息参考信号(channel state information reference signal,CSI-RS)、相位跟踪参考信号(phase tracking reference signal,PTRS)、探测参考信号(sounding reference signal,SRS)、物理随机接入信道(physical random access channel,PRACH)等。根据该参考信号,接收端已知或按照预定的规则可以推断出信号所在的时间和频率位置,以及时间和频率上承载的信号/符号。参考信号用于获取信号在传输中所受外界(例如,空间信道、发送或接收端器件非理想性)影响的已知信号,一般用于进行信道估计、辅助信号解调和检测等。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. Reference signal (sounding reference signal, SRS), physical random access channel (physical random access channel, PRACH), etc. According to the reference signal, 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.
该第一激励信号可以包括多个天线端口对应的激励信号,该多个天线端口对应的激励信号相互正交或准正交。当多个天线端口对应的激励信号相互正交或准正交时,有利于接收器进行信道估计。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. When 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.
可选地,该多个天线端口对应的激励信号也可以不是相互成交的。Optionally, the excitation signals corresponding to the multiple antenna ports may not trade with each other.
可选地,该接收器还可以根据接收到的第一参考信号进行激励器-反射器-接收器的级联信道估计,获取激励器各个天线端口的预编码信息。该接收器还可以根据该第一参考信号,对该激励器和该反射器之间的信道以及该反射器和该接收器之间的信道进行估计,以获取预编码信息。该预编码信息可以是激励器各个天线端口分别发送的预调制信息,也可 以是激励器各个天线端口分别发送的预编码信息,也可以是激励器各个天线端口发送信号之间的相位差和/或幅度差信息等。该预编码信息可以是基于线性预编码方式得到的,例如,匹配滤波器、迫零预编码等;该预编码信息也可以是基于非线性预编码方式得到的,如脏纸编码、矢量预编码等,本申请实施例对此不做具体限定。Optionally, 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.
步骤S220,激励器接收该预编码信息。In step S220, the exciter receives the precoding information.
步骤S230,该激励器将该预编码信息调制后发送第二激励信号,该第二激励信号根据该预编码信息调制后的信号确定。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.
一种可能的实现方式是,该激励器可以将该预编码信息调制后再发送,例如,该调制方式可以是QPSK、16QAM、64QAM、256QAM和1024QAM中的任意一种。A possible implementation manner is that the exciter may modulate the precoding information before sending it. For example, the modulation method may be any one of QPSK, 16QAM, 64QAM, 256QAM, and 1024QAM.
激励器直接将该预编码信息调制后直接发送,有利于提升反射通信的系统性能。The exciter directly modulates the precoding information and sends it directly, which is beneficial to improve the performance of the reflection communication system.
另一种可能的实现方式中,该激励器还可以根据该预编码信息,通过查表的方式获取发送第二激励信号的预编码权值。In another possible implementation manner, the exciter may also obtain the precoding weight for sending the second excitation signal by looking up the table according to the precoding information.
另一种可能的实现方式中,该激励器还可以根据各个天线端口的预编码信息,通过查表的方式分别获取各个天线端口的预编码权值,根据预编码权值发送第二激励信号。其中表格中的预编码权值为星座空间中的符号。例如,该星座空间可以是QPSK、16QAM、64QAM、256QAM和1024QAM中的至少一种。In another possible implementation manner, 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. For example, the constellation space may be at least one of QPSK, 16QAM, 64QAM, 256QAM, and 1024QAM.
在激励器发送第二激励信号的过程中,该接收器还可以接收该反射器反射的数据信号和/或第二参考信号,该第二激励信号包括该预编码信息调制后的信号。During the process of the exciter sending the second excitation signal, 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.
可选地,该第二激励信号还可以根据多个天线端口各自对应的第二参考信号来确定。当该第二激励信号中包括多个天线端口各自对应的相同的第二参考信号时,避免了激励信号发送的多个信号之间发生相同的干扰,有利于接收器进行数据信号的解调,从而能够提升反射通信的系统性能。该第二参考信号可以是系统预定义的,也可以是激励器配置的,如通过预设方式形成的序列,该序列是加扰作用的信号,能够避免各个信道之间发生相同的干扰。该第二参考信号还可以是解调参考信号(demodulation reference signal,DMRS)、信道状态信息参考信号(channel state information reference signal,CSI-RS)、相位跟踪参考信号(phase tracking reference signal,PTRS)、探测参考信号(sounding reference signal,SRS)、物理随机接入信道(physical random access channel,PRACH)等,本申请实施例对此不做具体限定。Optionally, the second excitation signal may also be determined according to the second reference signal corresponding to each of the multiple antenna ports. When 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.
上述技术方案中,接收器首先根据接收到的参考信号进行反射通信的信道估计,获取预编码信息,然后将该预编码信息反馈给激励器,激励器根据将该预编码信息调制后进行相应的功率匹配发送第二激励信号,该第二激励信号包括预编码信息调制信号,在此过程中,反射器反射数据信号。该方案利用激励直接将预编码信息调制后发送能够减小反射通信信道之间的干扰,提升接收端接收数据的性能。In the above technical solution, 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.
图3是本申请实施例的反射通信的又一示意图。如图3所示,该方法300包括步骤S310至步骤S370。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.
步骤S310,激励器发送第一激励信号。In step S310, the exciter sends a first excitation signal.
该第一激励信号可以包括多个天线端口对应的激励信号,该多个天线端口对应的激励信号相互正交或准正交。当多个天线端口对应的激励信号相互正交或准正交时,有利于接收器进行信道估计。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. When 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.
可选地,该多个天线端口对应的激励信号也可以不是相互正交的。Optionally, the excitation signals corresponding to the multiple antenna ports may not be orthogonal to each other.
可选地,该多个天线端口对应的激励信号,在一部分时间、频率资源上是相互正交的,在另一部分时间、频率资源上不是相互正交的。Optionally, 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.
步骤S320,反射器反射第一参考信号。Step S320, the reflector reflects the first reference signal.
在激励器发送第一激励信号的过程中,反射器反射第一参考信号,该第一参考信号用于接收器对激励器和该反射器之间的信道以及该反射器和接收器之间的信道进行估计,以生成预编码信息。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.
该第一参考信号可以是系统预定义的也可以是激励器配置的,该第一参考信号还可以是根据接收器已知的方式生成的。例如,该第一参考信号可以是DMRS、CSI-RS、PTRS、SRS、PRACH、CSI-RS等,本申请实施例对此不做具体限定。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. For example, 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.
该第一激励信号可以是系统预定义的也可以是接收器配置的,该第一参考信号还可以是根据接收器已知的方式或者配置的方式生成的。例如,该第一参考信号可以是DMRS、CSI-RS、PTRS、SRS、PRACH、CSI-RS等,本申请实施例对此不做具体限定。The first excitation signal may be pre-defined by the system or configured by the receiver, and the first reference signal may also be generated according to a known manner or configuration manner of the receiver. For example, 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.
步骤S330,接收器根据接收到的第一参考信号进行信道估计,获取预编码信息。Step S330: The receiver performs channel estimation according to the received first reference signal, and obtains precoding information.
接收器根据接收到的第一参考信号进行信道估计,该信道包括激励器和反射器之间的信道以及反射器和接收器之间的信道,根据该信道估计的结果,获取激励器多个天线端口的预编码信息。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.
该预编码信息可以是激励器各个天线端口分别发送的预调制信息,也可以是激励器各个天线端口分别发送的预编码信息,也可以是激励器各个天线端口发送信号之间的相位差和/或幅度差信息等,也可以是激励器各个天线端口发送信号与参考天线端口之间的相位差和/或幅度差信息等。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., 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.
该预编码信息可以是基于线性预编码方式得到的,例如,匹配滤波器、迫零预编码等;该预编码信息也可以是基于非线性预编码方式得到的,如脏纸编码、矢量预编码等。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.
步骤S340,接收器向激励器发送该预编码信息。Step S340, the receiver sends the precoding information to the exciter.
可选地,接收器可以将该预编码信息量化后发送给激励器。一种可能的实现方式是将该预编码信息量化到激励器调制数据的星座,例如,16QAM、64QAM、256QAM、1024QAM等。Optionally, 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.
步骤S350,激励器调制该预编码信息,并发送第二激励信号。In step S350, the exciter modulates the precoding information and sends a second excitation signal.
该激励器各个端口的预编码信息可以进一步与各自天线端口对应的第二参考信号相乘,该第二参考信号可以是预定义的,也可以是激励器配置的,还可以是根据接收器已知的方式生成的信号。例如,该第二参考信号可以是DMRS、CSI-RS、PTRS、SRS、PRACH、CSI-RS等。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. For example, the second reference signal may be DMRS, CSI-RS, PTRS, SRS, PRACH, CSI-RS, etc.
可选地,在相同的时间和频率资源上,该各自天线端口的预编码信息可以乘以相同的第二参考信号。Optionally, on the same time and frequency resources, the precoding information of the respective antenna ports may be multiplied by the same second reference signal.
可选地,激励器可以将该预编码信息调制后发送,一种可能的实现方式是将该预编码信息调制映射到星座空间,例如,该星座空间可以为QPSK、16QAM,64QAM、256QAM、1024QAM中的至少一个。Optionally, 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. For example, the constellation space can be QPSK, 16QAM, 64QAM, 256QAM, or 1024QAM. At least one of them.
步骤S360,反射器反射数据信号。Step S360, the reflector reflects the data signal.
在激励器发送第二激励信号的过程中,反射器反射数据信号,该激励信号是基于该预 编码信息生成得到的激励信号。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.
可选地,反射器反射数据信号和/或第三参考信号,当反射器反射数据信号和/或第三参考信号时,有利于接收端进行数据信号的解调。Optionally, the reflector reflects the data signal and/or the third reference signal. When the reflector reflects the data signal and/or the third reference signal, it is beneficial for the receiving end to demodulate the data signal.
在开始反射通信之前,所述方法还包括步骤S370,激励器、或者接收器或者其他控制实体配置反射通信,完成反射通信所需要的参数配置。Before starting the reflection communication, 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.
当接收器为控制器时,激励器的天线端口数,可以事先通知接收器,接收器根据天线端口数,具体配置发送端口数量和信号,即最终发送的端口数量可以少于激励器支持的天线端口数量。When the receiver is a controller, 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.
当激励器为控制器时,其中激励信号和/或反射信号配置信息发送给接收器,以供接收器进行激励信号消除和/或反射信号解调。When the exciter is a controller, 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.
当第三方控制设备为控制器时,其中激励信号和/或反射信号配置信息发送给接收器,以供接收器进行激励信号消除和/或反射信号解调。When the third-party control device is a controller, 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.
发送给激励器或者接收器的激励信号配置信息和/或反射信号配置信息可以通过无线资源控制(radio resource control,RRC)信令,媒介接入控制-控制元素(medium access control-control element,MAC CE),媒介接入控制-协议数据单元(medium access control-protocol data unit,MAC-PDU),下行控制信息(downlink control information,DCI)、系统信息中的至少一项指示。发送给反射器的反射信号配置信息是通过激励器的反射链路控制信息、反射链路无线资源控制信息、反射链路媒介接入控制信息中的至少一个通知给反射器的。反射链路是指激励器到反射器之间的通信链路,或者是激励器到反射器到接收器之间的通信链路。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.
其中,激励信号配置信息包括但不限于:激励信号的频率、时间、子载波间隔、发送端口数、各个端口映射的信号以及频率和/或时间位置等。反射信号配置信息包括但不限于:反射数据符号速率、第一反射起始时刻以及时间长度(用于估计级联信道)、第二反射起始时刻以及时间长度(用于反射数据信号)、反射数据比特时间宽度、反射数据比特速率等。Wherein, 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.
下面将详细介绍本申请实施例中的一种多天线预编码的原理。The principle of a multi-antenna precoding in the embodiment of the present application will be described in detail below.
MIMO信道的信号模型为:The signal model of the MIMO channel is:
激励信号为:s=[s 0,s 1,...,s M-1] T,s i为任意信号序列; The excitation signal is: s=[s 0 ,s 1 ,...,s M-1 ] T , s i is any signal sequence;
激励器到接收器信道:h=[h 0,h 1,...,h M-1]; Exciter to receiver channel: h=[h 0 ,h 1 ,...,h M-1 ];
激励器到反射器信道:g=[g 0,g 1,...,g M-1]; Channel from exciter to reflector: g=[g 0 ,g 1 ,...,g M-1 ];
反射器到接收器信道:f;Reflector to receiver channel: f;
噪声:n;Noise: n;
反射数据系数:
Figure PCTCN2019125920-appb-000001
默认为1;
Reflection data coefficient:
Figure PCTCN2019125920-appb-000001
The default is 1;
第k个OFDM符号到达BS的信号为y kThe signal arriving at the BS at the kth OFDM symbol is y k :
Figure PCTCN2019125920-appb-000002
Figure PCTCN2019125920-appb-000002
即:which is:
Figure PCTCN2019125920-appb-000003
Figure PCTCN2019125920-appb-000003
其中s k,m为预编码向量与参考信号乘积。可以基于以下假设:参考信号为1,即各个天线端口m的预编码直接发送。还可以假设相邻反射数据符号理想的干扰(激励信号)消除。事实上,如果采取比较好的反射数据扩频码对反射器数据进行扩频,则可以达到该理想消除状态。例如,一个反射器数据比特,经过以下扩频码的扩频: Where 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:
长度为2的扩频码[1,-1];Spreading code of length 2 [1,-1];
或者长度为4的扩频码:[1,-1,1,-1],[1,1,-1,-1],[1,-1,-1,1];Or a spreading code of length 4: [1,-1,1,-1], [1,1,-1,-1], [1,-1,-1,1];
或者长度为8的扩频码:[1,-1,1,-1,1,-1,1,-1],[1,1,-1,-1,1,1,-1,-1],[1,-1,-1,1,1,-1,-1,1],[1,1,1,1,-1,-1,-1,-1],[1,-1,1,-1,-1,1,-1,1],[1,1,-1,-1,-1,-1,1,1],[1,-1,-1,1,-1,1,1,-1];Or a spreading code of length 8: [1,-1,1,-1,1,-1,1,-1],[1,1,-1,-1,1,1,-1,- 1],[1,-1,-1,1,1,-1,-1,1],[1,1,1,1,-1,-1,-1,-1],[1, -1,1,-1,-1,1,-1,1],[1,1,-1,-1,-1,-1,1,1],[1,-1,-1, 1,-1,1,1,-1];
或者其它任意长度的扩频码,满足扩频码内1和-1的数量相等,或者1和-1的数量差小于N,其中N为非负整数。例如N,为1或者2。Or other spreading codes of any length, satisfying that the numbers of 1 and -1 in the spreading code are equal, or the difference between the numbers of 1 and -1 is less than N, where N is a non-negative integer. For example, N is 1 or 2.
需要注意的是,以上1和-1是表示反射器的两个状态。在另外的实现方式中,可以是其它值和/或其它数量的状态。例如A和-A,再例如A和B,再例如A和0,再例如1和0。再例如四个状态,A,-A,A*j,-A*j,其中j表示复数单位。It should be noted that the above 1 and -1 are the two states of the reflector. In other implementations, it may be other values and/or other numbers of states. For example, 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.
或者,还可以采取连续干扰消除的方式,将直达激励信号进行消除。由于与本申请无关,因此不作详述。消除后的信号为(依然采取y k,n k分别表示直达激励信号消除后的接收信号以及其中的噪声): Alternatively, the continuous interference cancellation method can also be adopted to eliminate the direct excitation signal. Since it has nothing to do with this application, it will not be described in detail. The signal after cancellation is (still taking y k , and n k respectively represents the received signal after the direct excitation signal is cancelled and the noise in it):
Figure PCTCN2019125920-appb-000004
Figure PCTCN2019125920-appb-000004
为了提升接收性能,需要最大化信噪比。即最大化
Figure PCTCN2019125920-appb-000005
的能量。理论上,如果可以获取fg m,则进行预编码
Figure PCTCN2019125920-appb-000006
可以获得最佳接收信噪比(即最大化
Figure PCTCN2019125920-appb-000007
Figure PCTCN2019125920-appb-000008
)。而更一般地,如果针对带宽信号,带宽为P(即P个子载波或者RE),且具有N根接收天线时,可以获取最佳预编码向量:
In order to improve the receiving performance, the signal-to-noise ratio needs to be maximized. I.e. maximize
Figure PCTCN2019125920-appb-000005
energy of. Theoretically, if fg m can be obtained, precoding is performed
Figure PCTCN2019125920-appb-000006
Can get the best received signal-to-noise ratio (i.e. maximize
Figure PCTCN2019125920-appb-000007
or
Figure PCTCN2019125920-appb-000008
). 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:
Figure PCTCN2019125920-appb-000009
Figure PCTCN2019125920-appb-000009
其中f n*,pg m,p可以是
Figure PCTCN2019125920-appb-000010
也可以是其它任意的n,甚至是根据f n,pg m,p,n=0,1,...,N-1得到的值;n为接收天线索引,p为子载波或RE索引。
Where f n*, p g m, p can be
Figure PCTCN2019125920-appb-000010
It can also be any other n, even the value obtained according to f n,p g m,p ,n=0,1,...,N-1; n is the receiving antenna index, and p is the subcarrier or RE index .
但是fg m是实数值,接收端通知激励器时需要把该值进行量化。如果带宽、发送天线数M、接收天线数N比较多时,将导致比较大的开销。因此需要量化方案。 However, 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.
一种实现方式是,将s k,m,p或者s k,m量化到激励器调制数据的星座。例如该星座空间可以是16QAM、64QAM、256QAM、1024QAM,或者其它激励器支持的任意数据调制方式对应的数字空间信号点。 One implementation is to quantize s k, m, p or s k, m to the constellation of the modulated data of the exciter. For example, the constellation space can be 16QAM, 64QAM, 256QAM, 1024QAM, or digital space signal points corresponding to any data modulation mode supported by other exciters.
通过这种基于反馈的预编码方式,反射数据接收具有最佳信噪比,能够提升反射数据的接收性能。Through this feedback-based precoding method, the reflection data reception has the best signal-to-noise ratio, which can improve the reception performance of the reflection data.
下面将介绍本申请实施例的硬件结构。图4是本申请实施例的反射通信的硬件结构图。如图4的(a)所示,激励器中信号发射和信号接收单元用于信号的发射和接收,激励信号生成单元产生发射的数据信号。如图4的(b)所示,接收器的接收信号处理单元 用于处理接收到的信号。如图4的(c)所示,反射器包含数据接收解调、能量收集和管理、信号调制反射、控制逻辑或处理器(进一步包含存储单元,以及可选的信道编码模块)。反射器还可以与传感器或者传感器数据进行连接,使得反射器可以传输传感器采集的数据。The hardware structure of the embodiment of the present application will be described below. Fig. 4 is a hardware structure diagram of reflective communication in an embodiment of the present application. As shown in Figure 4(a), 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. As shown in Figure 4(b), the received signal processing unit of the receiver is used to process the received signal. As shown in Figure 4(c), 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.
反射器反射的数据可以是标识信息,也可以是其它数据,例如传感器采集的温度、湿度等数据。在接收能量时,反射器内部电路与能量收集和管理模块连接;在反射信号时,反射器内部电路与信号调制反射模块连通。当然,某些传感器具备同时进行能量收集和信号调制反射。反射器中的控制逻辑或处理器(或称为微处理器)主要进行接收数据处理和反射数据处理。The data reflected by the reflector can be identification information or other data, such as temperature, humidity and other data collected by the sensor. 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. Of course, some sensors have simultaneous energy harvesting and signal modulation reflection. The control logic or processor (or called a microprocessor) in the reflector mainly performs receiving data processing and reflection data processing.
下面将介绍本申请实施例的激励信号的时频结构。图5是本申请实施例的第一激励信号的时频结构图。如图5的(a)所示,该激励器包含两个天线端口,激励器端口1和激励器端口2。该第一激励信号在时间维度上包含多个正交频分复用(orthogonal frequency division multiplexing,OFDM)符号,在频率上由两个资源元素,即子载波(resource element,RE)组成。激励器端口1的预编码信息s 1,1、s 1,2承载在一个子载波中,激励器端口2的预编码信息s 2,1、s 2,2承载在另一个子载波中,通过这种正交的频率资源,区分激励器不同的天线端口。如图5的(b)所示,还可以通过正交的码域资源,区分激励器不同的天线端口,还可以采取其它正交的方式,区分各个天线端口,例如正交的时间资源、正交的时间/频率/码域资源进行区分,这里不作图示。当多个天线端口对应的激励信号相互正交或准正交时,有利于接收器进行信道估计。如图5的(c)所示,该激励信号的频率资源被分成多个部分,例如,图中示出了频率资源被划分为4个子载波的情形,其中,中间两个子载波用于发送第一参考信号,用于接收端进行信道估计,而其他部分用于使用预编码信息与其他反射器进行通信,图中的预编码信息为预编码向量与参考信号的乘积。事实上,该激励信号中间的两个子载波可以采用如图5的(a)或(b)中的任意一种方式发送参考信号,本申请实施例对此不做具体限定。 The time-frequency structure of the excitation signal of the embodiment of the present application will be described below. Fig. 5 is a time-frequency structure diagram of a first excitation signal in an embodiment of the present application. As shown in Figure 5(a), 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. The precoding information s 1,1 and s 1,2 of the exciter port 1 is carried in one subcarrier, and 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. As shown in Figure 5(b), 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. When 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. As shown in Fig. 5(c), the frequency resource of the excitation signal is divided into multiple parts. For example, 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. In fact, 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.
图中为便于理解,仅示出了激励器包含两个端口的示意图,但这不应对本申请造成任何限定,实际作业中该激励器可以包含更多的端口。For ease of understanding, 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.
下面将介绍第二激励信号的时频结构。图6是本申请实施例的第二激励信号的时频结构图。如图6所示,在该第二激励信号中,可以包括天线端口的预编码信息和各自对应的第二参考信号,各个天线端口可以根据各自的预编码信息和/或第二参考信号,发送第二激励信号。该天线端口各自对应的第二参考信号可以为相同的参考信号,如,图6中激励器端口1的s 1,1乘以m 1,相对应的,激励器端口2的s 2,1也乘以m 1The time-frequency structure of the second excitation signal will be described below. Fig. 6 is a time-frequency structure diagram of a second excitation signal in an embodiment of the present application. As shown in FIG. 6, 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 excitation 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 .
图中为便于理解,仅示出了激励器包含两个端口的示意图,但这不应对本申请造成任何限定,实际作业中该激励器可以包含更多的端口。For ease of understanding, 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.
下面将介绍本申请实施例的激励信号与反射信号的时间结构。图7是本申请实施例的激励信号的时间结构示意图。如图7所示,激励信号在时间维度上包含K个OFDM符号,每个OFDM符号内对应各自的预编码向量S。图8是本申请实施例的反射信号的时间结构示意图,如图8所示,反射数据符号由预编码向量和数据组成,L个数据符号之间存在空隙。反射信号在时间上,可以基于OFDM符号的时间维度,即一个反射信号符号时间为N个OFDM符号,其中N可以为非负整数,或者N=1/2,1/3,1/4;也可以基于反射信号时间长度,即与OFDM符号时间不一样。The time structure of the excitation signal and the reflected signal of the embodiment of the present application will be described below. FIG. 7 is a schematic diagram of the time structure of an excitation signal in an embodiment of the present application. As shown in Fig. 7, 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. As shown in FIG. 8, the reflected data symbol is composed of a precoding vector and data, and there are gaps between L data symbols. The time of the reflected signal can be based on the time dimension of the OFDM symbol, that is, the time of a reflected signal symbol is N OFDM symbols, where N can be a non-negative integer, or N=1/2, 1/3, 1/4; It can be based on the reflected signal time length, that is, it is not the same as the OFDM symbol time.
下面将结合图9至图11,介绍本申请实施例的接收器、激励器和反射器。图9是本 申请实施例的接收器的示意图。如图9所示,该接收器900至少包括接收模块910、处理模块920和发送模块930。该接收模块910用于在激励器发送第一激励信号的过程中,接收反射器反射的第一参考信号;该处理模块920,用于根据该第一参考信号,对该激励器和该反射器之间的信道以及该反射器和该接收器之间的信道进行估计,得到预编码信息;该发送模块930,用于向激励器发送该预编码信息;该接收模块910还用于在激励器发送第二激励信号的过程中,接收该反射器反射的数据信号,该第二激励信号是根据该预编码信息调制后的信号来确定的。The receiver, exciter, and reflector of the embodiments of the present application will be introduced below in conjunction with FIG. 9 to FIG. 11. Fig. 9 is a schematic diagram of a receiver of an embodiment of the present application. As shown in FIG. 9, 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.
可选地,该技术方案中,接收器根据第一参考信号对反射通信的各个信道进行信道估计,获取预编码信息,激励器接收并调制接收器反馈的该预编码信息,该方案可以减小反射通信信道之间的干扰,提升接收端接收的数据的性能。Optionally, in this technical solution, 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.
可选地,该预编码信息可以是激励器各个天线端口分别发送的预调制信息,也可以是激励器各个天线端口分别发送的预编码信息,也可以是激励器各个天线端口发送信号之间的相位差和/或幅度差信息。Optionally, 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.
可选地,该第一参考信号可以是系统预定义的或者是激励器配置的。Optionally, the first reference signal may be predefined by the system or configured by the exciter.
可选地,在激励器发送第二激励信号的过程中,该接收器接收该反射器反射的数据信号和/或第二参考信号,该第二激励信号是基于该预编码信息生成得到的激励信号。Optionally, during the process of the exciter sending the second excitation signal, 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.
可选地,该第二激励信号还可以根据多个天线端口各自对应的第二参考信号来确定,该多个天线端口各自对应的第二参考信号为相同的参考信号。该多个天线端口各自对应的第二参考信号也可以是不同的参考信号。Optionally, 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.
该技术方案中,避免了激励信号发送的多个信号之间发生相同的干扰,有利于接收器进行数据信号的解调,从而能够提升反射通信的系统性能。In this technical solution, the same interference between multiple signals sent by the excitation signal is avoided, which facilitates the demodulation of the data signal by the receiver, thereby improving the performance of the reflection communication system.
可选地,该第二参考信号可以是系统预定义的或者是激励器配置的。Optionally, the second reference signal may be predefined by the system or configured by the exciter.
可选地,该接收模块910还用于,在激励器发送第二激励信号的过程中,接收反射器反射的数据信号和/或第三参考信号,该第二激励信号包括该预编码信息调制后的信号,该调制方式可以为QPSK、16QAM、64QAM、256QAM和1024QAM中的任意一种。Optionally, 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. For the latter signal, the modulation mode can be any of QPSK, 16QAM, 64QAM, 256QAM and 1024QAM.
该技术方案中,激励器直接将预编码信息调制后发送,有利于提升反射通信的系统性能。In this technical solution, the exciter directly modulates the precoding information and sends it, which is beneficial to improve the performance of the reflection communication system.
可选地,该第一参考信号用于该接收器获取预编码信息,包括:该接收器根据该第一参考信号,对该激励器-反射器-接收器之间的级联信道进行估计,以获取预编码信息。该接收器还可以根据该第一参考信号,对该激励器和该反射器之间的信道以及该反射器和该接收器之间的信道进行估计,以获取预编码信息。可选地,该第一激励信号包括所述多个天线端口对应的激励信号,所述多个天线端口对应的激励信号相互正交或准正交。Optionally, 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. Optionally, 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.
该技术方案中,当多个天线端口对应的激励信号相互正交或准正交时,有利于接收器进行信道估计。In this technical solution, when 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.
图10是本申请实施例的激励器的示意图。如图10所示,该激励器1000至少包括发送模块1010和接收模块1020。该发送模块1010用于发送第一激励信号,该第一激励信号用于向反射器提供用于向接收器反射第一参考信号的能量和信息载体,该第一参考信号用于该接收器获取预编码信息;该接收模块1020,用于从该接收器接收该预编码信息;该发送模块1010还用于发送第二激励信号,该第二激励信号包括该预编码信息调制后的 信号,该第二激励信号用于向反射器提供用于向该接收器反射数据信号的能量和信息载体。Fig. 10 is a schematic diagram of an exciter according to an embodiment of the present application. As shown in FIG. 10, 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.
基于上述技术方案,可以减小反射通信信道之间的干扰,提升接收端接收的数据的性能。Based on the above technical solution, the interference between reflected communication channels can be reduced, and the performance of the data received by the receiving end can be improved.
可选地,该预编码信息可以是激励器各个天线端口分别发送的预调制信息,也可以是激励器各个天线端口分别发送的预编码信息,也可以是激励器各个天线端口发送信号之间的相位差和/或幅度差信息。可选地,该第一参考信号可以是系统预定义的或者是激励器配置的。Optionally, 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. Optionally, the first reference signal may be predefined by the system or configured by the exciter.
可选地,发送第一激励信号和第二激励信号的起始时间和时间长度由控制器配置。Optionally, the start time and time length of sending the first excitation signal and the second excitation signal are configured by the controller.
可选地,该第二激励信号还可以根据多个天线端口各自对应的第二参考信号确定,该多个天线端口各自对应的第二参考信号为相同的参考信号。Optionally, 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.
该技术方案中,避免了激励信号发送的多个信号之间发生相同的干扰,有利于接收器进行数据信号的解调,从而能够提升反射通信的系统性能。In this technical solution, the same interference between multiple signals sent by the excitation signal is avoided, which facilitates the demodulation of the data signal by the receiver, thereby improving the performance of the reflection communication system.
可选地,激励器可以将该预编码信息调制信号与该第二参考信号的乘积发送。Optionally, the exciter may send the product of the precoding information modulation signal and the second reference signal.
可选地,该多个天线端口各自对应的第二参考信号也可以是不同的参考信号。Optionally, the second reference signals corresponding to each of the multiple antenna ports may also be different reference signals.
可选地,该第二参考信号可以是系统预定义的或者是激励器配置的。Optionally, the second reference signal may be predefined by the system or configured by the exciter.
可选地,该预编码信息调制后的信号包括该预编码信息经过以下任意一种调制方式调制后的信号:QPSK、16QAM、64QAM、256QAM和1024QAM。Optionally, 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.
该技术方案中,激励器直接将预编码信息调制后发送,有利于提升反射通信的系统性能。In this technical solution, the exciter directly modulates the precoding information and sends it, which is beneficial to improve the performance of the reflection communication system.
可选地,该第一参考信号用于该接收器获取预编码信息,包括:该接收器根据该第一参考信号,对该激励器-反射器-接收器之间的级联信道进行估计,以获取预编码信息。该接收器还可以根据该第一参考信号,对该激励器和该反射器之间的信道以及该反射器和该接收器之间的信道进行估计,以获取预编码信息。Optionally, 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.
可选地,该第一激励信号包括所述多个天线端口对应的激励信号,该多个天线端口对应的激励信号相互正交或准正交。Optionally, 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.
该技术方案中,当多个天线端口对应的激励信号相互正交或准正交时,有利于接收器进行信道估计。In this technical solution, when 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.
图11是本申请实施例的反射器的示意图。如图11所示,该反射器1100可以包括第一接收模块1110、第一反射模块1120、第二接收模块1130和第二反射模块1140。该第一接收模块1110用于接收激励器发送的第一激励信号,该第一激励信号用于向反射器提供用于向接收器反射第一参考信号的能量和信息载体;该第一反射模块1120用于在激励器发送第一激励信号的过程中,根据第一激励信号向接收器反射第一参考信号,该第一参考信号用于该接收器获取预编码信息;该第二接收模块1130,用于接收激励器发送的第二激励信号,该第二激励信号用于向反射器提供用于向该接收器反射数据信号的能量和信息载体;该第二反射模块1140,用于在该激励器发送第二激励信号的过程中,根据该第二激励信号向该接收器反射数据信号,该第二激励信号包括该预编码信息调制后的信号。Fig. 11 is a schematic diagram of a reflector according to an embodiment of the present application. As shown in FIG. 11, 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.
基于上述技术方案,可以减小反射通信信道之间的干扰,提升接收端接收的数据的性能。Based on the above technical solution, the interference between reflected communication channels can be reduced, and the performance of the data received by the receiving end can be improved.
可选地,该第一接收模块与该第二接收模块可以是同一个模块;该第一反射模块与该第二反射模块可以是同一个模块。Optionally, 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.
可选地,该第一参考信号可以是系统预定义的或者是激励器配置的。Optionally, the first reference signal may be predefined by the system or configured by the exciter.
可选地,在激励器发送第二激励信号的过程中,反射器反射数据信号和/或第二参考信号,该第二激励信号是基于该预编码信息生成得到的激励信号。Optionally, during the process of the exciter sending the second excitation signal, 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.
可选地,该第二激励信号还可以根据所述多个天线端口各自对应的第二参考信号来确定,该多个天线端口各自对应的第二参考信号是相同的参考信号。Optionally, 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.
该技术方案中,避免了激励信号发送的多个信号之间发生相同的干扰,有利于接收器进行数据信号的解调,从而能够提升反射通信的系统性能。In this technical solution, the same interference between multiple signals sent by the excitation signal is avoided, which facilitates the demodulation of the data signal by the receiver, thereby improving the performance of the reflection communication system.
可选地,该第二参考信号可以是系统预定义的或者是激励器配置的。Optionally, the second reference signal may be predefined by the system or configured by the exciter.
该第二反射模块,用于在该激励器发送第二激励信号的过程中,反射数据信号和/或第三参考信号,该第二激励信号包括该预编码信息调制后的信号,调制方式可以为QPSK、16QAM、64QAM、256QAM、1024QAM中的任意一种。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.
该技术方案中,激励器直接将预编码信息调制后发送,有利于提升反射通信的系统性能。In this technical solution, the exciter directly modulates the precoding information and sends it, which is beneficial to improve the performance of the reflection communication system.
可选地,该第一参考信号用于接收器获取预编码信息,包括:该接收器根据该第一参考信号,对该激励器-反射器-接收器之间的级联信道进行估计,以获取预编码信息。该接收器还可以根据该第一参考信号,对该激励器和该反射器之间的信道以及该反射器和该接收器之间的信道进行估计,以获取预编码信息。Optionally, 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.
可选地,该第一激励信号包括该多个天线端口对应的激励信号,该多个天线端口对应的激励信号相互正交或准正交。Optionally, 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.
该技术方案中,当多个天线端口对应的激励信号相互正交或准正交时,有利于接收器进行信道估计。In this technical solution, when 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.
本领域普通技术人员可以意识到,结合本文中所公开的实施例描述的各示例的单元及算法步骤,能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行,取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能,但是这种实现不应认为超出本申请的范围。A person of ordinary skill in the art may realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.
所属领域的技术人员可以清楚地了解到,为描述的方便和简洁,上述描述的系统、装置和单元的具体工作过程,可以参考前述方法实施例中的对应过程,在此不再赘述。Those skilled in the art can clearly understand that, for the convenience and conciseness of the description, the specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiment, which is not repeated here.
在本申请所提供的几个实施例中,应该理解到,所揭露的系统、装置和方法,可以通过其它的方式实现。例如,以上所描述的装置实施例仅仅是示意性的,例如,所述单元的划分,仅仅为一种逻辑功能划分,实际实现时可以有另外的划分方式,例如多个单元或组件可以结合或者可以集成到另一个系统,或一些特征可以忽略,或不执行。另一点,所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口,装置或单元的间接耦合或通信连接,可以是电性,机械或其它的形式。In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method can be implemented in other ways. For example, 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. In addition, 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.
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的,作为单元显示的部件可以是或者也可以不是物理单元,即可以位于一个地方,或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。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.
另外,在本申请各个实施例中的各功能单元可以集成在一个处理单元中,也可以是各个单元单独物理存在,也可以两个或两个以上单元集成在一个单元中。In addition, 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.
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时,可以存储在一个计算机可读取存储介质中。基于这样的理解,本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来,该计算机软件产品存储在一个存储介质中,包括若干指令用以使得一台计算机设备(可以是个人计算机,服务器,或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括:U盘、移动硬盘、只读存储器(read-only memory,ROM)、随机存取存储器(random access memory,RAM)、磁碟或者光盘等各种可以存储程序代码的介质。If 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. Based on this understanding, 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 .
以上所述,仅为本申请的具体实施方式,但本申请的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本申请揭露的技术范围内,可轻易想到变化或替换,都应涵盖在本申请的保护范围之内。因此,本申请的保护范围应以所述权利要求的保护范围为准。The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims (24)

  1. 一种反射通信方法,其特征在于,包括:A reflection communication method, characterized in that it comprises:
    激励器发送第一激励信号,所述第一激励信号用于向反射器提供用于向接收器反射第一参考信号的能量和信息载体,所述第一参考信号用于所述接收器获取预编码信息;The exciter sends 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 by the receiver to obtain the preset signal. Encoding information;
    所述激励器接收所述预编码信息;The exciter receives the precoding information;
    所述激励器发送第二激励信号,所述第二激励信号包括所述预编码信息调制后的信号,所述第二激励信号用于向所述反射器提供用于向所述接收器反射数据信号的能量和信息载体。The exciter sends a second excitation signal, the second excitation signal includes a signal modulated by the precoding information, and the second excitation signal is used to provide the reflector for reflecting data to the receiver Signal energy and information carrier.
  2. 如权利要求1所述的方法,其特征在于,所述第二激励信号是根据多个天线端口各自对应的第二参考信号确定的,所述多个天线端口各自对应的第二参考信号为相同的参考信号。The method according to claim 1, wherein the second excitation signal is 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.
  3. 如权利要求1或2所述的方法,其特征在于,所述预编码信息调制后的信号包括所述预编码信息经过以下任意一种调制方式调制后的信号:The method according to claim 1 or 2, wherein the signal modulated by the precoding information comprises a signal modulated by the precoding information through any one of the following modulation methods:
    正交相移键控QPSK、16正交振幅调制QAM、64QAM、256QAM和1024QAM。Quadrature phase shift keying QPSK, 16 quadrature amplitude modulation QAM, 64QAM, 256QAM and 1024QAM.
  4. 如权利要求1-3中任一项所述的方法,其特征在于,所述第一激励信号包括所述多个天线端口对应的激励信号,所述多个天线端口对应的激励信号相互正交或准正交。The method according to any one of claims 1 to 3, wherein the first excitation signal comprises excitation signals corresponding to the multiple antenna ports, and the excitation signals corresponding to the multiple antenna ports are orthogonal to each other Or quasi-orthogonal.
  5. 一种反射通信方法,其特征在于,包括:A reflection communication method, characterized in that it comprises:
    反射器接收激励器发送的第一激励信号,所述第一激励信号用于向所述反射器提供用于向接收器反射第一参考信号的能量和信息载体;The reflector receives the first excitation signal sent by the exciter, where the first excitation signal is used to provide the reflector with energy and an information carrier for reflecting the first reference signal to the receiver;
    根据所述第一激励信号,所述反射器向所述接收器反射所述第一参考信号,所述第一参考信号用于所述接收器获取预编码信息;According to the first excitation signal, the reflector reflects the first reference signal to the receiver, and the first reference signal is used by the receiver to obtain precoding information;
    反射器接收所述激励器发送的第二激励信号,所述第二激励信号用于向所述反射器提供用于向所述接收器反射数据信号的能量和信息载体;The reflector receives a second excitation signal sent by the exciter, where the second excitation signal is used to provide the reflector with energy and an information carrier for reflecting the data signal to the receiver;
    根据所述第二激励信号,所述反射器向所述接收器反射数据信号,所述第二激励信号包括所述预编码信息调制后的信号。According to the second excitation signal, the reflector reflects a data signal to the receiver, and the second excitation signal includes a signal modulated by the precoding information.
  6. 如权利要求5所述的方法,其特征在于,所述第二激励信号是根据多个天线端口各自对应的第二参考信号确定的,所述多个天线端口各自对应的第二参考信号为相同的参考信号。The method of claim 5, wherein 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 the multiple antenna ports are the same. Reference signal.
  7. 如权利要求5或6所述的方法,其特征在于,所述预编码信息调制后的信号包括所述预编码信息经过以下任意一种调制方式调制后的信号:The method according to claim 5 or 6, wherein the signal modulated by the precoding information comprises a signal modulated by the precoding information through any one of the following modulation methods:
    QPSK、16QAM、64QAM、256QAM和1024QAM。QPSK, 16QAM, 64QAM, 256QAM and 1024QAM.
  8. 如权利要求5-7中任一项所述的方法,其特征在于,所述第一激励信号包括所述多个天线端口对应的激励信号,所述多个天线端口对应的激励信号相互正交或准正交。The method according to any one of claims 5-7, wherein the first excitation signal comprises excitation signals corresponding to the multiple antenna ports, and the excitation signals corresponding to the multiple antenna ports are orthogonal to each other Or quasi-orthogonal.
  9. 一种反射通信方法,其特征在于,包括:A reflection communication method, characterized in that it comprises:
    接收器接收反射器根据第一激励信号反射的第一参考信号;The receiver receives the first reference signal reflected by the reflector according to the first excitation signal;
    所述接收器根据所述第一参考信号,获取预编码信息;The receiver obtains precoding information according to the first reference signal;
    所述接收器向所述激励器发送所述预编码信息;Sending the precoding information to the exciter by the receiver;
    所述接收器接收所述反射器根据第二激励信号反射的数据信号,所述第二激励信号包括所述预编码信息调制后的信号。The receiver receives the data signal reflected by the reflector according to a second excitation signal, and the second excitation signal includes a signal modulated by the precoding information.
  10. 如权利要求9所述的方法,其特征在于,所述第二激励信号是根据多个天线端口各自对应的第二参考信号确定的,所述多个天线端口各自对应的第二参考信号为相同的参考信号。The method according to claim 9, wherein 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 the multiple antenna ports are the same. Reference signal.
  11. 如权利要求9或10所述的方法,其特征在于,所述预编码信息调制后的信号包括所述预编码信息经过以下任意一种调制方式调制后的信号:The method according to claim 9 or 10, wherein the signal modulated by the precoding information comprises a signal modulated by the precoding information through any one of the following modulation methods:
    QPSK、16QAM、64QAM、256QAM和1024QAM。QPSK, 16QAM, 64QAM, 256QAM and 1024QAM.
  12. 如权利要求9-11中任一项所述的方法,其特征在于,所述第一激励信号包括所述多个天线端口对应的激励信号,所述多个天线端口对应的激励信号相互正交或准正交。The method according to any one of claims 9-11, wherein the first excitation signal comprises excitation signals corresponding to the multiple antenna ports, and the excitation signals corresponding to the multiple antenna ports are orthogonal to each other Or quasi-orthogonal.
  13. 一种激励器,其特征在于,包括:An exciter, characterized in that it comprises:
    发送模块,用于发送第一激励信号,所述第一激励信号用于向反射器提供用于向接收器反射第一参考信号的能量和信息载体,所述第一参考信号用于所述接收器获取预编码信息;The sending module 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 receiving To obtain precoding information;
    接收模块,用于从所述接收器接收所述预编码信息;A receiving module, configured to receive the precoding information from the receiver;
    所述发送模块还用于发送第二激励信号,所述第二激励信号包括所述预编码信息调制后的信号,所述第二激励信号用于向所述反射器提供用于向所述接收器反射数据信号的能量和信息载体。The sending module is further configured to send a second excitation signal, the second excitation signal includes a signal modulated by the precoding information, and the second excitation signal is used to provide the reflector to the receiver. The device reflects the energy of the data signal and the information carrier.
  14. 如权利要求13所述的激励器,其特征在于,所述第二激励信号是根据多个天线端口各自对应的第二参考信号确定的,所述多个天线端口各自对应的第二参考信号为相同的参考信号。The exciter according to claim 13, wherein the second excitation signal is determined according to a 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.
  15. 如权利要求13或14所述的激励器,其特征在于,所述预编码信息调制后的信号包括所述预编码信息经过以下任意一种调制方式调制后的信号:The exciter according to claim 13 or 14, wherein the signal modulated by the precoding information comprises a signal modulated by the precoding information through any one of the following modulation methods:
    QPSK、16QAM、64QAM、256QAM和1024QAM。QPSK, 16QAM, 64QAM, 256QAM and 1024QAM.
  16. 如权利要求13-15中任一项所述的激励器,其特征在于,所述第一激励信号包括所述多个天线端口对应的激励信号,所述多个天线端口对应的激励信号相互正交或准正交。The exciter according to any one of claims 13-15, wherein the first excitation signal comprises excitation signals corresponding to the multiple antenna ports, and the excitation signals corresponding to the multiple antenna ports are mutually positive. Or quasi-orthogonal.
  17. 一种反射器,其特征在于,包括:A reflector, characterized in that it comprises:
    第一接收模块,用于接收激励器发送的第一激励信号,所述第一激励信号用于向所述反射器提供用于向接收器反射第一参考信号的能量和信息载体;A first receiving module, configured to receive a first excitation signal sent by an exciter, where the first excitation signal is used to provide the reflector with energy and an information carrier for reflecting the first reference signal to the receiver;
    第一反射模块,用于根据所述第一激励信号,向所述接收器反射所述第一参考信号,所述第一参考信号用于所述接收器获取预编码信息;A first reflection module, configured to reflect the first reference signal to the receiver according to the first excitation signal, where the first reference signal is used by the receiver to obtain precoding information;
    第二接收模块,用于接收所述激励器发送的第二激励信号,所述第二激励信号用于向所述反射器提供用于向所述接收器反射数据信号的能量和信息载体;A second receiving module, configured to receive a second excitation signal sent by the exciter, where the second excitation signal is used to provide the reflector with energy and an information carrier for reflecting the data signal to the receiver;
    第二反射模块,用于根据所述第二激励信号,向所述接收器反射数据信号,所述第二激励信号包括所述预编码信息调制后的信号。The second reflection module is configured to reflect a data signal to the receiver according to the second excitation signal, where the second excitation signal includes a signal modulated by the precoding information.
  18. 如权利要求17所述的反射器,其特征在于,所述第二激励信号是根据多个天线端口各自对应的第二参考信号确定的,所述多个天线端口各自对应的第二参考信号为相同的参考信号。The reflector according to claim 17, wherein the second excitation signal is determined according to a 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.
  19. 如权利要求17或18所述的反射器,其特征在于,所述预编码信息调制后的信号包括所述预编码信息经过以下任意一种调制方式调制后的信号:The reflector according to claim 17 or 18, wherein the signal modulated by the precoding information comprises a signal modulated by the precoding information through any one of the following modulation methods:
    QPSK、16QAM、64QAM、256QAM和1024QAM。QPSK, 16QAM, 64QAM, 256QAM and 1024QAM.
  20. 如权利要求17-19中任一项所述的反射器,其特征在于,所述第一激励信号包括所述多个天线端口对应的激励信号,所述多个天线端口对应的激励信号相互正交或准正交。The reflector according to any one of claims 17-19, wherein the first excitation signal comprises excitation signals corresponding to the multiple antenna ports, and the excitation signals corresponding to the multiple antenna ports are mutually positive. Or quasi-orthogonal.
  21. 一种接收器,其特征在于,包括:A receiver, characterized in that it comprises:
    接收模块,接收反射器根据第一激励信号反射的第一参考信号;A receiving module, which receives the first reference signal reflected by the reflector according to the first excitation signal;
    处理模块,用于根据所述第一参考信号获取预编码信息;A processing module, configured to obtain precoding information according to the first reference signal;
    发送模块,用于向所述激励器发送所述预编码信息;A sending module, configured to send the precoding information to the exciter;
    所述接收模块还用于,接收所述反射器根据第二激励信号反射的数据信号,所述第二激励信号包括所述预编码信息调制后的信号。The receiving module is further configured to receive a data signal reflected by the reflector according to a second excitation signal, where the second excitation signal includes a signal modulated by the precoding information.
  22. 如权利要求21所述的接收器,其特征在于,所述第二激励信号是根据多个天线端口各自对应的第二参考信号确定的,所述多个天线端口各自对应的第二参考信号为相同的参考信号。The receiver according to claim 21, wherein 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.
  23. 如权利要求21或22所述的接收器,其特征在于,所述预编码信息调制后的信号包括所述预编码信息经过以下任意一种调制方式调制后的信号:The receiver according to claim 21 or 22, wherein the signal modulated by the precoding information comprises a signal modulated by the precoding information through any one of the following modulation methods:
    QPSK、16QAM、64QAM、256QAM和1024QAM。QPSK, 16QAM, 64QAM, 256QAM and 1024QAM.
  24. 如权利要求21-23中任一项所述的接收器,其特征在于,所述第一激励信号包括所述多个天线端口对应的激励信号,所述多个天线端口对应的激励信号相互正交或准正交。The receiver according to any one of claims 21-23, wherein the first excitation signal comprises excitation signals corresponding to the multiple antenna ports, and the excitation signals corresponding to the multiple antenna ports are mutually positive. Or quasi-orthogonal.
PCT/CN2019/125920 2019-12-17 2019-12-17 Backscatter communication method, exciter, reflector and receiver WO2021119987A1 (en)

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