Reflective communication method, exciter, reflector and receiver

Abstract

The application provides a reflection communication method, an exciter, a reflector and a receiver. The method comprises: the exciter sending a first excitation signal, the first excitation signal being used for providing energy and an information carrier for the reflector to reflect a first reference signal to the receiver, the first reference signal being used for the receiver to obtain precoding information; the exciter receiving the precoding information; and the exciter sending a second excitation signal, the second excitation signal comprising a signal modulated by the precoding information, the second excitation signal being used for providing energy and an information carrier for the reflector to reflect a data signal to the receiver. Through the reflection communication method, interference between reflection communication channels is reduced, and the performance of the receiver in receiving data in reflection communication is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of communication, and more particularly, to a reflection communication method, an exciter, a reflector and a receiver. BACKGROUND

[0002] In the reflection communication, the reflector generally reflects the excitation signal of the exciter and carries data in the reflection.

[0003] 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 the MIMO is applied in the reflection communication, the traditional exciter cannot identify the current multi-antenna precoding technology, and the current multi-antenna precoding technology is complex in the processing process. When it is applied in the reflection communication, the data received by the receiving end is not necessarily accurate. SUMMARY

[0004] The present application provides a reflection communication method, an exciter, a reflector and a receiver, which can improve the performance of receiving data in the reflection communication.

[0005] In a first aspect, a reflection communication method is provided, which includes: an exciter sending a first excitation signal, the first excitation signal being used to provide energy and an information carrier for a reflector to reflect a first reference signal to a receiver, the first reference signal being used for the receiver to obtain precoding information; the exciter receiving the precoding information from the receiver; the exciter sending a second excitation signal, the second excitation signal including a signal modulated by the precoding information, the second excitation signal being used to provide energy and an information carrier for the reflector to reflect a data signal to the receiver.

[0006] Based on the above technical solution, the interference between the reflection communication channels can be reduced, and the performance of the data received by the receiving end can be improved.

[0007] Optionally, the precoding information can be the pre-modulation information sent by each antenna port of the exciter respectively, can be the precoding information sent by each antenna port of the exciter respectively, or can be the phase difference and / or amplitude difference information between the signals sent by each antenna port of the exciter, etc.

[0008] Optionally, the first reference signal can be predefined by the system or configured by the exciter.

[0009] Optionally, the starting time and the time length of sending the first excitation signal and the second excitation signal are configured by a controller.

[0010] With reference to the first aspect, in some implementations of the first aspect, the second excitation signal is determined according to a second reference signal corresponding to each of the plurality of antenna ports, and the second reference signal corresponding to each of the plurality of antenna ports is a same reference signal.

[0011] In the technical solution, the same interference between the multiple signals of the excitation signal transmission is avoided, which facilitates the demodulation of the data signal by the receiver, and thus the system performance of the reflection communication can be improved.

[0012] Optionally, the exciter can transmit the product of the precoding information modulation signal and the second reference signal, which can be predefined by the system or configured by the exciter, or a sequence formed in a preset manner.

[0013] Optionally, the second reference signal corresponding to each of the plurality of antenna ports can also be a different reference signal.

[0014] With reference to the first aspect, in some implementations of the first aspect, the precoding information modulation signal includes a signal modulated by any one of the following modulation methods: quadrature phase shift keying (QPSK), or quadrature amplitude modulation (QAM), such as 16QAM, 64QAM, 256QAM, and 1024QAM.

[0015] In the technical solution, the exciter directly transmits the precoding information modulation signal, which facilitates the improvement of the system performance of the reflection communication.

[0016] With reference to the first aspect, in some implementations of the first aspect, the first reference signal is used by the receiver to obtain the precoding information, including: the receiver estimates a cascaded channel between the exciter-reflector-receiver according to the first reference signal to obtain the precoding information.

[0017] Optionally, the receiver can also estimate a channel between the exciter and the reflector and a channel between the reflector and the receiver according to the first reference signal to obtain the precoding information.

[0018] With reference to the first aspect, in some implementations of the first aspect, the first excitation signal includes excitation signals corresponding to a plurality of antenna ports, and the excitation signals corresponding to the plurality of antenna ports are mutually orthogonal or quasi-orthogonal.

[0019] In the technical solution, when the excitation signals corresponding to the plurality of antenna ports are mutually orthogonal or quasi-orthogonal, the channel estimation by the receiver is facilitated.

[0020] In a second aspect, a reflective communication method is provided, which comprises: receiving, by a reflector, a first excitation signal sent by an exciter, the first excitation signal being used to provide the reflector with energy and an information carrier for reflecting a first reference signal to a receiver; reflecting, by the reflector, the first reference signal to the receiver according to the first excitation signal, the first reference signal being used by the receiver to obtain precoding information; receiving, by the reflector, a second excitation signal sent by the exciter, the second excitation signal being used to provide the reflector with energy and an information carrier for reflecting a data signal to the receiver; and reflecting, by the reflector, the data signal to the receiver according to the second excitation signal, the second excitation signal comprising a signal modulated by the precoding information.

[0021] Based on the above technical solution, interference between reflective communication channels can be reduced, and the performance of data received by the receiver can be improved.

[0022] Optionally, the precoding information can be pre-modulation information sent by each antenna port of the exciter respectively, can be precoding information sent by each antenna port of the exciter respectively, or can be phase difference and / or amplitude difference information between signals sent by each antenna port of the exciter.

[0023] Optionally, the first reference signal can be predefined by a system or configured by the exciter.

[0024] In combination with the second aspect, in some implementations of the second aspect, the second excitation signal is determined according to a second reference signal corresponding to each of the plurality of antenna ports, and the second reference signal corresponding to each of the plurality of antenna ports is a same reference signal.

[0025] In the technical solution, the same interference between multiple signals of the excitation signal is avoided, which is conducive to improving the system performance of the reflective communication.

[0026] Optionally, the second reference signal can be predefined by a system or configured by the exciter.

[0027] Optionally, when the second excitation signal comprises a second reference signal corresponding to each of the plurality of antenna ports, the reflector reflects the data signal and / or a third reference signal, which is conducive to demodulation of the data signal by the receiver.

[0028] In combination with the second aspect, in some implementations of the second aspect, the signal modulated by the precoding information comprises a signal modulated by the precoding information by any one of the following modulation modes: QPSK, 16QAM, 64QAM, 256QAM, and 1024QAM.

[0029] In the technical solution, the exciter directly sends the signal modulated by the precoding information, which is conducive to improving the system performance of the reflective communication.

[0030] In some implementations of the second aspect, in combination with the second aspect, the first reference signal is used by the receiver to obtain precoding information, including: the receiver estimates a cascaded channel between the exciter-reflector-receiver according to the first reference signal to obtain the precoding information.

[0031] Optionally, the receiver can further estimate a channel between the exciter and the reflector and a channel between the reflector and the receiver according to the first reference signal to obtain the precoding information.

[0032] In some implementations of the second aspect, in combination with the second aspect, the first excitation signal includes excitation signals corresponding to the plurality of antenna ports, and the excitation signals corresponding to the plurality of antenna ports are mutually orthogonal or quasi-orthogonal.

[0033] In the technical solution, when the excitation signals corresponding to the plurality of antenna ports are mutually orthogonal or quasi-orthogonal, the receiver can perform channel estimation.

[0034] In the third aspect, a reflector communication method is provided, including: 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 receiver sends the precoding information to the exciter; and the receiver receives a data signal reflected by the reflector according to a second excitation signal, the second excitation signal being determined according to a signal modulated based on the precoding information.

[0035] In the technical solution, the receiver obtains the precoding information according to the first reference signal, and the exciter receives and modulates the precoding information fed back by the receiver, which can reduce interference between reflector communication channels and improve the performance of data received by the receiver.

[0036] Optionally, the first reference signal can be predefined by a system or configured by the exciter.

[0037] Optionally, during the process in which the exciter sends the second excitation signal, the receiver receives a data signal reflected by the reflector and / or a third reference signal, and the second excitation signal includes a signal modulated based on the precoding information.

[0038] The third reference signal is beneficial for the receiver to demodulate the data signal of the reflector.

[0039] In some implementations of the third aspect, in combination with the third aspect, the second excitation signal is determined according to second reference signals corresponding to a plurality of antenna ports respectively, and the second reference signals corresponding to the plurality of antenna ports respectively are the same reference signal.

[0040] In the technical solution, the same interference between multiple signals of the excitation signal transmission is avoided, the data signal demodulation of the receiver is facilitated, and thus the system performance of the reflection communication can be improved.

[0041] Optionally, the second reference signal can be predefined by a system or configured by the exciter.

[0042] Optionally, the second reference signal corresponding to each of the multiple antenna ports can also be a different reference signal.

[0043] In some implementations of the third aspect, the signal modulated by the precoding information comprises a signal modulated by the precoding information by any one of the following modulation modes: QPSK, 16QAM, 64QAM, 256QAM, and 1024QAM.

[0044] In the technical solution, the exciter directly transmits the signal modulated by the precoding information, and thus the system performance of the reflection communication can be improved.

[0045] In some implementations of the third aspect, the first reference signal is used by the receiver to obtain the precoding information, and the obtaining comprises: the receiver estimates a cascaded channel between the exciter-reflector-receiver according to the first reference signal to obtain the precoding information.

[0046] Optionally, the receiver can also estimate a channel between the exciter and the reflector and a channel between the reflector and the receiver according to the first reference signal to obtain the precoding information.

[0047] In some implementations of the third aspect, the first excitation signal comprises excitation signals corresponding to multiple antenna ports, and the excitation signals corresponding to the multiple antenna ports are mutually orthogonal or quasi-orthogonal.

[0048] In the technical solution, when the excitation signals corresponding to the multiple antenna ports are mutually orthogonal or quasi-orthogonal, the channel estimation of the receiver is facilitated.

[0049] In a fourth aspect, an exciter is provided, which comprises: a sending module configured to send a first excitation signal, the first excitation signal being used to provide energy and an information carrier for a reflector to reflect a first reference signal to a receiver, the first reference signal being used by the receiver to obtain precoding information; a receiving module configured to receive the precoding information from the receiver; and the sending module is further configured to send a second excitation signal, the second excitation signal comprising a signal modulated by the precoding information, and the second excitation signal being used to provide energy and an information carrier for the reflector to reflect a data signal to the receiver.

[0050] Based on the above technical scheme, the interference between the reflection communication channels can be reduced, and the performance of the data received by the receiving end can be improved.

[0051] Optionally, the precoding information can be pre-modulation information respectively sent by each antenna port of the exciter, or can be precoding information respectively sent by each antenna port of the exciter, or can be phase difference and / or amplitude difference information between signals respectively sent by each antenna port of the exciter.

[0052] Optionally, the first reference signal can be predefined by the system or configured by the exciter.

[0053] Optionally, the starting time and the time length of sending the first excitation signal and the second excitation signal are configured by the controller.

[0054] In combination with 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 plurality of antenna ports, and the second reference signal corresponding to each of the plurality of antenna ports is the same reference signal.

[0055] In the technical scheme, the same interference between the multiple signals sent by the excitation signal is avoided, which is beneficial to demodulation of the data signal by the receiver, thereby improving the system performance of the reflection communication.

[0056] Optionally, the exciter can send the product of the precoding information modulation signal and the second reference signal.

[0057] Optionally, the second reference signal corresponding to each of the plurality of antenna ports can also be different reference signals.

[0058] Optionally, the second reference signal can be predefined by the system or configured by the exciter.

[0059] In combination with the fourth aspect, in some implementations of the fourth aspect, the precoding information modulation signal includes a signal modulated by the precoding information through any one of the following modulation modes: QPSK, 16QAM, 64QAM, 256QAM, and 1024QAM.

[0060] In the technical scheme, the exciter directly sends the precoding information after modulation, which is beneficial to improving the system performance of the reflection communication.

[0061] In combination with the fourth aspect, in some implementations of the fourth aspect, the first reference signal is used by the receiver to obtain the precoding information, including: the receiver estimates a cascade channel between the exciter-reflector-receiver according to the first reference signal to obtain the precoding information.

[0062] Optionally, the receiver can further estimate, according to the first reference signal, a channel between the exciter and the reflector and a channel between the reflector and the receiver to obtain precoding information.

[0063] In combination with the fourth aspect, in some implementations of the fourth aspect, the first excitation signal includes excitation signals corresponding to the plurality of antenna ports, and the excitation signals corresponding to the plurality of antenna ports are mutually orthogonal or quasi-orthogonal.

[0064] In the technical solution, when the excitation signals corresponding to the plurality of antenna ports are mutually orthogonal or quasi-orthogonal, the receiver can perform channel estimation.

[0065] In the fifth aspect, a reflector is provided, which includes: a first receiving module configured to receive a first excitation signal sent by an exciter, the first excitation signal being used to provide the reflector with energy and an information carrier for reflecting a first reference signal to a receiver; a first reflecting module configured to reflect, according to the first excitation signal, the first reference signal to the receiver, the first reference signal being used by the receiver to obtain precoding information; a second receiving module configured to receive a second excitation signal sent by the exciter, the second excitation signal being used to provide the reflector with energy and an information carrier for reflecting a data signal to the receiver; and a second reflecting module configured to reflect, according to the second excitation signal, the data signal to the receiver, the second excitation signal including a signal modulated by the precoding information.

[0066] Based on the above technical solution, interference between reflection communication channels can be reduced, and the performance of data received by the receiver can be improved.

[0067] Optionally, the first receiving module and the second receiving module can be the same module, and the first reflecting module and the second reflecting module can be the same module.

[0068] Optionally, the first reference signal can be predefined by a system or configured by the exciter.

[0069] In combination with the fifth aspect, in some implementations of the fifth aspect, the second excitation signal is determined according to second reference signals corresponding to the plurality of antenna ports respectively, and the second reference signals corresponding to the plurality of antenna ports respectively are the same reference signal.

[0070] In the technical solution, the same interference between multiple signals sent by the excitation signal is avoided, which is beneficial to demodulation of the data signal by the receiver, thereby improving the system performance of the reflection communication.

[0071] Optionally, the second reference signal can be predefined by a system or configured by the exciter.

[0072] In some implementations of the fifth aspect, in combination with the fifth aspect, the pre-coded information modulated signal comprises a signal modulated by any one of the following modulation modes: QPSK, 16QAM, 64QAM, 256QAM, and 1024QAM.

[0073] In the technical solution, the exciter directly transmits the pre-coded information modulated signal, which is conducive to improving the system performance of the reflection communication.

[0074] In some implementations of the fifth aspect, in combination with the fifth aspect, the first reference signal is used by the receiver to obtain the pre-coded information, comprising: the receiver estimates the cascade channel between the exciter-reflector-receiver according to the first reference signal to obtain the pre-coded information.

[0075] 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 the pre-coded information.

[0076] In some implementations of the fifth aspect, in combination with the fifth aspect, the first excitation signal comprises excitation signals corresponding to the plurality of antenna ports, and the excitation signals corresponding to the plurality of antenna ports are mutually orthogonal or quasi-orthogonal.

[0077] In the technical solution, when the excitation signals corresponding to the plurality of antenna ports are mutually orthogonal or quasi-orthogonal, the receiver can perform channel estimation.

[0078] In the sixth aspect, a receiver is provided, comprising: a receiving module, configured to receive a first reference signal reflected by a reflector in a process in which an exciter transmits a first excitation signal; a processing module, configured to obtain pre-coded information according to the first reference signal; a transmitting module, configured to transmit the pre-coded information to the exciter; and the receiving module is further configured to receive a data signal reflected by the reflector in a process in which the exciter transmits a second excitation signal, the second excitation signal being determined according to a signal modulated by the pre-coded information.

[0079] In the technical solution, the receiver obtains the pre-coded information according to the first reference signal, and the exciter receives and modulates the pre-coded information fed back by the receiver, which can reduce the interference between reflection communication channels and improve the performance of the data received at the receiving end.

[0080] Optionally, the pre-coded information can be pre-modulation information transmitted by each antenna port of the exciter respectively, can be pre-coded information transmitted by each antenna port of the exciter respectively, or can be phase difference and / or amplitude difference information between signals transmitted by each antenna port of the exciter.

[0081] Optionally, the first reference signal can be predefined by the system or configured by the exciter.

[0082] Optionally, the receiver receives the data signal reflected by the reflector and / or the second reference signal during the exciter sending the second excitation signal, the second excitation signal being an excitation signal generated based on the precoding information.

[0083] 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 plurality of antenna ports, the second reference signal corresponding to each of the plurality of antenna ports being the same reference signal.

[0084] In the technical solution, the same interference between the multiple signals sent by the excitation signal is avoided, which is conducive to demodulation of the data signal by the receiver, thereby improving the system performance of the reflection communication.

[0085] Optionally, the second reference signal can be predefined by the system or configured by the exciter.

[0086] With reference to the sixth aspect, in some implementations of the sixth aspect, the signal modulated by the precoding information includes a signal modulated by the precoding information by any one of the following modulation modes: QPSK, 16QAM, 64QAM, 256QAM, and 1024QAM.

[0087] In the technical solution, the exciter directly sends the signal modulated by the precoding information, which is conducive to improving the system performance of the reflection communication.

[0088] With reference to the sixth aspect, in some implementations of the sixth aspect, the first reference signal is used by the receiver to obtain the precoding information, including: the receiver estimates a cascaded channel between the exciter-reflective-receiver according to the first reference signal to obtain the precoding information.

[0089] Optionally, the receiver can also estimate a channel between the exciter and the reflector and a channel between the reflector and the receiver according to the first reference signal to obtain the precoding information.

[0090] With reference to the sixth aspect, in some implementations of the sixth aspect, the first excitation signal includes excitation signals corresponding to the plurality of antenna ports, the excitation signals corresponding to the plurality of antenna ports being mutually orthogonal or quasi-orthogonal.

[0091] In the technical solution, when the excitation signals corresponding to the plurality of antenna ports are mutually orthogonal or quasi-orthogonal, it is conducive to channel estimation by the receiver.

[0092] The seventh aspect provides an exciter, including a transceiver circuit and a processing circuit, the processing circuit being configured to perform the method of the first aspect by using the transceiver circuit.

[0093] In an eighth aspect, there is provided a reflector comprising transceiving circuitry and processing circuitry configured to perform the method of the second aspect using the transceiving circuitry.

[0094] In a ninth aspect, there is provided a receiver comprising transceiving circuitry and processing circuitry configured to perform the method of the third aspect using the transceiving circuitry. BRIEF DESCRIPTION OF DRAWINGS

[0095] Figure 1 is a schematic architecture diagram of a reflective communication system according to an embodiment of the present application.

[0096] Figure 2 is a schematic diagram of reflective communication according to an embodiment of the present application.

[0097] Figure 3 is yet another schematic diagram of reflective communication according to an embodiment of the present application.

[0098] Figure 4 is a schematic diagram of hardware structure according to an embodiment of the present application.

[0099] Figure 5 is a schematic diagram of time-frequency structure of a first excitation signal according to an embodiment of the present application.

[0100] Figure 6 is a schematic diagram of time-frequency structure of a second excitation signal according to an embodiment of the present application.

[0101] Figure 7 is a schematic diagram of time structure of an excitation signal according to an embodiment of the present application.

[0102] Figure 8 is a schematic diagram of time structure of a reflected signal according to an embodiment of the present application.

[0103] Figure 9 is a schematic diagram of a receiver according to an embodiment of the present application.

[0104] Figure 10 is a schematic diagram of an exciter according to an embodiment of the present application.

[0105] Figure 11 is a schematic diagram of a reflector according to an embodiment of the present application. DETAILED DESCRIPTION

[0106] The technical solutions in the present application will be described below with reference to the accompanying drawings.

[0107] The technical solutions of the embodiments of the present application can be applied to any system using reflective communication technology at present or in the future.

[0108] Reflective communication relies on the wireless signals received by the reflector antenna terminal for communication, and is suitable for extremely low power consumption and low cost information transmission for Internet of Things applications.Figure 1 A schematic architecture diagram of a reflective communication system according to an embodiment of this application is shown. Figure 1 As shown, the reflective communication system 100 includes at least an exciter, a reflector, and a receiver.

[0109] exist Figure 1 In this process, the exciter sends a wireless signal; the reflector receives the exciter's wireless signal and reflects it; during reflection, the reflector carries its own signal onto the reflected signal; the receiver demodulates the data carried on the reflected signal. Based on their operating mode or capabilities, reflectors are classified into passive (the energy required for data processing and reflection is obtained through the wireless signal) and semi-active (i.e., some communication processes require power from batteries or other means). Regardless of whether they are passive or semi-active, they both achieve low-power or even external power-free communication by carrying data on the reflected wireless signal.

[0110] In this application embodiment, based on the correspondence between the exciter, receiver and the existing LTE or NR network, there are several possibilities: the exciter is a user equipment (UE) and the receiver is a base station; the exciter is a base station and the receiver is a user equipment; both the exciter and the receiver are user equipment; and both the exciter and the receiver are base stations.

[0111] In this application embodiment, any one of the exciter, reflector, and receiver can be interpreted as: any one of the following in existing 3GPP networks: network equipment, user equipment (UE), Internet of Things (IoT) devices, or devices; or as a reader or tag in an RFID network; or a dedicated receiver (a dedicated device for receiving reflected signals, which can be connected to network equipment or directly connected to a cellular network); or a dedicated exciter (a dedicated device for transmitting excitation signals, which can be connected to network equipment or directly connected to a cellular network). Furthermore, the possibility of future protocol definitions of new device types / names is not excluded.

[0112] The terminal device in the embodiments of the present application can refer to a user equipment, an access terminal, a user unit, a user station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent or a user apparatus. 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), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved public land mobile network (PLMN), etc. The embodiments of the present application are not limited thereto.

[0113] The network device in the embodiments of the present application can be a device for communicating with the terminal device. The network device can be a base transceiver station (BTS) in a global system of mobile communication (GSM) system or a code division multiple access (CDMA), can also be a base station (nodeB, NB) in a wideband code division multiple access (WCDMA) system, can also be an evolved nodeB (eNB or eNodeB) in an LTE system, can also be a wireless controller in a cloud radio access network (CRAN) scenario, or the network device can be a relay station, an access point, a vehicle-mounted device, a wearable device, a network device in a future 5G network or a network device in a future evolved PLMN network, etc. The embodiments of the present application are not limited thereto.

[0114] Other possible names for an exciter include: helper, interrogator, reader, and user equipment (UE). Other possible names for a reflector include: backscatter device, battery-less device, passive device, semi-passive device, ambient signal device, and tag. Reflective communication is also known as passive communication, passive communication, and ambient communication.

[0115] like Figure 1 As shown, the backscatter communication system may further include a controller. In one implementation, the receiver is the controller. The excitation signal configuration information and / or reflection signal configuration information sent by the controller to the exciter or receiver can be indicated by at least one of radio resource control (RRC) signaling, medium access control-control element (MAC CE), 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 communicated to the reflector via at least one of the exciter's reflection link control information, reflection link radio resource control information, and reflection link medium access control information. The reflection link refers to the communication link between the exciter and the reflector, or the communication link between the exciter and the reflector and the receiver.

[0116] The excitation signal configuration information includes, but is not limited to: the frequency, time, subcarrier spacing, number of transmitting ports, the signal mapped to each port, and its frequency and / or time position. The reflection signal configuration information includes, but is not limited to: the reflection data symbol rate, the reflection start time and duration, the reflection data bit time width, and the reflection data bit rate.

[0117] This should be understandable. Figure 1It is only shown that the exciter is a controller in the schematic diagram, in an implementation, the exciter can be a controller, wherein the excitation signal and / or the reflected signal configuration information is sent to the receiver for excitation signal cancellation and / or reflected signal demodulation. In an implementation, the third party device is a controller, wherein the excitation signal and / or the reflected signal configuration information is sent to the receiver for excitation signal cancellation and / or reflected signal demodulation, which is not limited in the embodiments of the present application.

[0118] It should be understood that in an implementation of the embodiments of the present application, the exciter and the receiver in the backscatter communication system 100 can be integrated into the same node, which is the same device. For example, in a radio-frequency identification (RFID) system, the exciter and the receiver are integrated into the same node, which is called a reader-writer.

[0119] In the RFID system, the communication process can be divided into the following steps:

[0120] Step 1: Send a continuous wave (CW) signal, i.e., a single tone signal / cosine signal / sine signal, to provide energy to the reflector.

[0121] Step 2: The reader-writer sends an amplitude-shift keying (ASK) signal to charge the reflector and send control information, while the activated reflector demodulates the ASK signal of the reader-writer to obtain the control information, and then performs corresponding operations in Step 3.

[0122] Step 3: The reader-writer continuously sends a continuous wave to provide energy and information carriers to the reflector; the reflector reflects a data signal according to the control information of the reader-writer; the reader-writer receives the signal while sending the continuous wave excitation signal, and attempts to demodulate the reflected data.

[0123] Step 4: The reading or writing process of the reflector can be performed through multiple steps 1 to 3 until the target operation is completed.

[0124] The excitation signal sent by the exciter has two functions: charging and acting as a reflection data carrier, i.e. providing energy and an information carrier for the reflector. That is, when reflecting the signal, the reflector is powered by the excitation signal and carries its own data signal in the excitation signal. From the perspective of the occupied frequency band width, the signal sent by the exciter can be a single-tone signal (i.e. a continuous sine wave) or a single-carrier signal, or a multi-tone signal (e.g. a signal with a certain bandwidth). Generally, the signal sent by the exciter is a known signal or a data signal sent to the receiver. In an RFID system, the reader / writer (which sends the excitation signal) sends a single-tone signal, also known as a continuous wave (CW), which does not carry any data. When the RFID reflects data, the original data is directly carried in the signal.

[0125] The multiple input multiple output (MIMO) technology in a cellular network, i.e. the multi-antenna technology, is divided into downlink and uplink. In the MIMO uplink process, the base station tells the terminal to perform a sending operation by sending a transmitted precoding matrix indicator (TPMI), and the precoding formula is relatively complex. In the MIMO downlink process, the precoding matrix W = W1*W2, where W1 represents L orthogonal beam precoding (generally a DFT matrix, with uniform amplitude), and W2 is the combination of L beams, which is generally quantized by quadrature phase shift keying (QPSK) or 8-PSK, and through two-stage encoding, non-uniform precoding can be realized to make different spatial channel components have different weights.

[0126] To improve the system performance of the reflection communication, when the MIMO is applied in the reflection communication, there is interference between channels, which causes the data received by the receiving end of the reflection communication system to be inaccurate.

[0127] The multi-antenna excitation method based on feedback provided by the embodiments of the present application reduces the interference between channels and improves the performance of the receiving end in the reflection communication.

[0128] The embodiments of the present application will be described below with reference to the accompanying drawings. Figure 2 The method of the reflection communication of the embodiments of the present application is described. Figure 2 is a schematic diagram of the reflection communication of the embodiments of the present application. As shown in Figure 2 The method 200 includes steps S210 to S230.

[0129] In step S210, the exciter sends a first excitation signal, which is used for the reflector to reflect a first reference signal to the receiver, and the receiver uses the first reference signal to obtain precoding information.

[0130] The first reference signal can be configured by the exciter or predefined by the system.

[0131] The first reference signal can be a demodulation reference signal (DMRS), a channel state information reference signal (CSI-RS), a phase tracking reference signal (PTRS), a sounding reference signal (SRS), a physical random access channel (PRACH), etc. According to the reference signal, the receiving end can infer the time and frequency positions of the signal and the signals / symbols carried in the time and frequency domain according to the predetermined rules. The reference signal is used to obtain a known signal affected by the outside world (for example, a space channel, a non-ideal device of the sending or receiving end) in the transmission, and is generally used for channel estimation, auxiliary signal demodulation and detection, etc.

[0132] The first excitation signal can include excitation signals corresponding to a plurality of antenna ports, and the excitation signals corresponding to the plurality of antenna ports are orthogonal or quasi-orthogonal to each other. When the excitation signals corresponding to the plurality of antenna ports are orthogonal or quasi-orthogonal to each other, it is beneficial for the receiver to perform channel estimation.

[0133] Alternatively, the excitation signals corresponding to the plurality of antenna ports can also not be orthogonal to each other.

[0134] Optionally, the receiver can further perform exciter-reflector-receiver cascade channel estimation according to the received first reference signal, to obtain precoding information of each antenna port of the exciter. The receiver can further 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 pre-modulation information sent by each antenna port of the exciter respectively, or can be precoding information sent by each antenna port of the exciter respectively, or can be phase difference and / or amplitude difference information between signals sent by each antenna port of the exciter, etc. The precoding information can be obtained based on linear precoding, such as matched filter, zero-forcing precoding, etc.; or can be obtained based on nonlinear precoding, such as dirty paper coding, vector precoding, etc., which are not limited in the embodiments of the present application.

[0135] In step S220, the exciter receives the precoding information.

[0136] In step S230, the exciter modulates and sends the second excitation signal according to the precoding information. The second excitation signal is determined according to the signal modulated by the precoding information.

[0137] In a possible implementation, the exciter can modulate and send the precoding information, for example, the modulation mode can be any one of QPSK, 16QAM, 64QAM, 256QAM and 1024QAM.

[0138] The exciter directly modulates and sends the precoding information, which is beneficial to improve the system performance of the reflection communication.

[0139] In another possible implementation, the exciter can further obtain precoding weight values for sending the second excitation signal according to the precoding information by table lookup.

[0140] In another possible implementation, the exciter can further obtain precoding weight values for each antenna port according to the precoding information of each antenna port by table lookup, and send the second excitation signal according to the precoding weight values. The precoding weight values in the table are symbols in constellation space. For example, the constellation space can be at least one of QPSK, 16QAM, 64QAM, 256QAM and 1024QAM.

[0141] In the process of sending the second excitation signal by the exciter, the receiver can further receive the data signal and / or the second reference signal reflected by the reflector. The second excitation signal includes the signal modulated by the precoding information.

[0142] Optionally, the second excitation signal can also be determined according to the second reference signal corresponding to each of the plurality of antenna ports. When the same second reference signal corresponding to each of the plurality of antenna ports is included in the second excitation signal, the same interference between the signals sent by the excitation signal is avoided, which is beneficial for the receiver to demodulate the data signal, thereby improving the system performance of the reflection communication. The second reference signal can be predefined by the system or configured by the exciter, such as a sequence formed by a preset manner, which is a scrambled signal and can avoid the same interference between channels. The second reference signal can also be a demodulation reference signal (DMRS), a channel state information reference signal (CSI-RS), a phase tracking reference signal (PTRS), a sounding reference signal (SRS), a physical random access channel (PRACH), and the like, which are not limited in the embodiments of the present application.

[0143] In the above technical solution, the receiver first performs channel estimation of the reflection communication according to the received reference signal to obtain precoding information, and then feeds back the precoding information to the exciter. The exciter modulates the precoding information and then performs corresponding power matching to send the second excitation signal. The second excitation signal includes the precoding information modulation signal. In this process, the reflector reflects the data signal. The scheme directly modulates and sends the precoding information by using the excitation to reduce the interference between the reflection communication channels and improve the performance of the receiver to receive data.

[0144] Figure 3 is another schematic diagram of the reflection communication of the embodiments of the present application. As shown in Figure 3 The method 300 includes steps S310 to S370.

[0145] Step S310, the exciter sends a first excitation signal.

[0146] The first excitation signal can include excitation signals corresponding to a plurality of antenna ports, and the excitation signals corresponding to the plurality of antenna ports are orthogonal or quasi-orthogonal to each other. When the excitation signals corresponding to the plurality of antenna ports are orthogonal or quasi-orthogonal to each other, it is beneficial for the receiver to perform channel estimation.

[0147] Optionally, the excitation signals corresponding to the plurality of antenna ports can also not be orthogonal to each other.

[0148] Optionally, the excitation signals corresponding to the plurality of antenna ports are orthogonal to each other on a part of time and frequency resources, and are not orthogonal to each other on another part of time and frequency resources.

[0149] In step S320, the reflector reflects the first reference signal.

[0150] In the process in which the exciter transmits the first excitation signal, the reflector reflects the first reference signal, which is used by the receiver to estimate channels between the exciter and the reflector and between the reflector and the receiver, to generate precoding information.

[0151] The first reference signal can be predefined by the system or configured by the exciter, and can also be generated in a manner known to the receiver. For example, the first reference signal can be a DMRS, a CSI-RS, a PTRS, an SRS, a PRACH, a CSI-RS, etc., which is not specifically limited in the embodiments of the present application.

[0152] The first excitation signal can be predefined by the system or configured by the receiver, and can also be generated in a manner known to the receiver or configured by the receiver. For example, the first excitation signal can be a DMRS, a CSI-RS, a PTRS, an SRS, a PRACH, a CSI-RS, etc., which is not specifically limited in the embodiments of the present application.

[0153] In step S330, the receiver performs channel estimation according to the received first reference signal, and obtains the precoding information.

[0154] The receiver performs channel estimation according to the received first reference signal, and the channel includes a channel between the exciter and the reflector and a channel between the reflector and the receiver. According to a result of the channel estimation, the precoding information of the plurality of antenna ports of the exciter is obtained.

[0155] The precoding information can be pre-modulation information transmitted by each antenna port of the exciter respectively, can be pre-coding information transmitted by each antenna port of the exciter respectively, can be phase difference and / or amplitude difference information between signals transmitted by each antenna port of the exciter, etc., or can be phase difference and / or amplitude difference information between signals transmitted by each antenna port of the exciter and a reference antenna port, etc.

[0156] The precoding information can be obtained based on a linear precoding manner, for example, a matched filter, a zero-forcing precoding, etc. The precoding information can also be obtained based on a nonlinear precoding manner, for example, a dirty paper coding, a vector precoding, etc.

[0157] In step S340, the receiver transmits the precoding information to the exciter.

[0158] Optionally, the receiver can send the precoding information to the exciter after quantization. One possible implementation is to quantize the precoding information to the constellation of the exciter modulation data, such as 16QAM, 64QAM, 256QAM, 1024QAM, etc.

[0159] At step S350, the exciter modulates the precoding information and sends a second excitation signal.

[0160] The precoding information of each port of the exciter can be further multiplied by a second reference signal corresponding to the respective antenna port. The second reference signal can be predefined, configured by the exciter, or generated according to a known manner of the receiver. For example, the second reference signal can be DMRS, CSI-RS, PTRS, SRS, PRACH, CSI-RS, etc.

[0161] Optionally, the precoding information of each antenna port can be multiplied by the same second reference signal on the same time and frequency resource.

[0162] Optionally, the exciter can send the precoding information after modulation. One possible implementation is to map the precoding information to a constellation space, such as at least one of QPSK, 16QAM, 64QAM, 256QAM, 1024QAM.

[0163] At step S360, the reflector reflects the data signal.

[0164] During the process of the exciter sending the second excitation signal, the reflector reflects the data signal, and the excitation signal is generated based on the precoding information.

[0165] Optionally, the reflector reflects the data signal and / or a 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.

[0166] Before starting the reflection communication, the method further includes step S370, the exciter, or the receiver or other control entity configures the reflection communication, and completes the parameter configuration required for the reflection communication.

[0167] When the receiver is the controller, the number of antenna ports of the exciter can be previously notified to the receiver. The receiver specifically configures the number of sending ports and signals according to the number of antenna ports, i.e., the final number of sending ports can be less than the number of antenna ports supported by the exciter.

[0168] When the exciter is the controller, the excitation signal and / or reflection signal configuration information is sent to the receiver for excitation signal cancellation and / or reflection signal demodulation by the receiver.

[0169] When the third-party control device is a controller, the excitation signal and / or reflected signal configuration information is sent to the receiver so that the receiver can perform excitation signal cancellation and / or reflected signal demodulation.

[0170] The excitation signal configuration information and / or reflection signal configuration information sent to the exciter or receiver can be indicated by at least one of the following: radio resource control (RRC) signaling, medium access control-control element (MAC CE), 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 communicated to the reflector via at least one of the following: reflection link control information, reflection link radio resource control information, and reflection link medium access control information. The reflection link refers to the communication link between the exciter and the reflector, or the communication link between the exciter and the reflector and the receiver.

[0171] The excitation signal configuration information includes, but is not limited to: the frequency, time, subcarrier spacing, number of transmitting ports, signals mapped to each port, and their frequency and / or time positions. The reflection signal configuration information includes, but is not limited to: the reflected data symbol rate, the first reflection start time and duration (for estimating the concatenated channel), the second reflection start time and duration (for the reflected data signal), the reflected data bit time width, and the reflected data bit rate.

[0172] The principle of a multi-antenna precoding method in the embodiments of this application will be described in detail below.

[0173] The signal model of a MIMO channel is:

[0174] The excitation signal is: s = [s0, s1, ..., s M-1 ] T s i It can be any signal sequence;

[0175] Exciter-to-receiver channel: h = [h0, h1, ..., h M-1 ];

[0176] Exciter-to-reflector channel: g = [g0, g1, ..., g M-1 ];

[0177] Reflector-to-receiver channel: f;

[0178] Noise: n;

[0179] Reflection data coefficients: The default value is 1;

[0180] The signal of the k-th OFDM symbol arriving at the BS is y. k :

[0181]

[0182] Right now:

[0183]

[0184] Where s k,m This is the product of the precoded vector and the reference signal. This can be based on the following assumptions: the reference signal is 1, meaning the precoded data at each antenna port m is directly transmitted. It can also be assumed that adjacent reflected data symbols have ideal interference (excitation signal) cancellation. In fact, this ideal cancellation state can be achieved by using a good spreading code to spread the reflector data. For example, a reflector data bit, spread using the following spreading code:

[0185] A spreading code of length 2 [1, -1];

[0186] Or a spreading code of length 4: [1,-1,1,-1], [1,1,-1,-1], [1,-1,-1,1];

[0187] 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,-1,1,1,1];

[0188] Alternatively, it can be any other spreading code of any length, satisfying that the number of 1s and -1s in the spreading code is equal, or the difference between the number of 1s and -1s is less than N, where N is a non-negative integer. For example, N can be 1 or 2.

[0189] It's important to note that the 1 and -1 above represent two states of the reflector. In other implementations, these can be other values ​​and / or other numbers of states. For example, A and -A, A and B, A and 0, 1 and 0. Another example is four states: A, -A, A*j, -A*j, where j represents the complex unit.

[0190] Or, the direct-path excitation signal can be eliminated in a continuous interference cancellation manner. Since it is irrelevant to the present application, it will not be described in detail. The signal after elimination is (still taking y k , n k respectively represent the received signal after elimination of the direct-path excitation signal and the noise therein):

[0191]

[0192] In order to improve the reception performance, the signal-to-noise ratio needs to be maximized. That is, the energy of is maximized. In theory, if fg m can be obtained, precoding can obtain the best reception signal-to-noise ratio (that is, maximize or ). More generally, if the bandwidth signal has a bandwidth P (that is, P subcarriers or REs) and has N receiving antennas, the best precoding vector can be obtained:

[0193]

[0194] Where f n*,p g m,p may be or 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.

[0195] But fg m is a real value, and the receiving end needs to quantize the value when notifying the exciter. If the bandwidth, the number of sending antennas M, and the number of receiving antennas N are large, it will result in a large overhead. Therefore, a quantization scheme is needed.

[0196] One implementation is to quantize s k,m,p or s k,m to the constellation of the exciter modulation data. For example, the constellation space can be 16QAM, 64QAM, 256QAM, 1024QAM, or any digital space signal point corresponding to the data modulation mode supported by the exciter.

[0197] Through this feedback-based precoding manner, the reflected data reception has the best signal-to-noise ratio, which can improve the reception performance of the reflected data.

[0198] The hardware structure of the embodiment of the present application will be introduced below. Figure 4 is the hardware structure diagram of the reflected communication of the embodiment of the present application. As shown in Figure 4The signal transmitting and receiving unit of the exciter is used for signal transmission and reception, and the excitation signal generating unit generates the transmitted data signal. As shown in Figure 4 The receiving signal processing unit of the receiver is used for processing the received signal. As shown in Figure 4 The reflector contains data receiving demodulation, energy collection and management, signal modulation reflection, control logic or processor (further containing a storage unit, and an optional channel coding module). The reflector can also be connected with a sensor or sensor data, so that the reflector can transmit the data collected by the sensor.

[0199] The data reflected by the reflector can be identification information or other data such as temperature, humidity, etc. 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 can simultaneously collect energy and modulate signals. The control logic or processor (or microprocessor) in the reflector mainly processes the received data and the reflected data.

[0200] The time-frequency structure of the excitation signal of the embodiment of the present application will be introduced below. Figure 5 is a time-frequency structure diagram of the first excitation signal of the embodiment of the present application. As shown in Figure 5 The exciter contains two antenna ports, exciter port 1 and exciter port 2. The first excitation signal contains a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time dimension, and is composed of two resource elements, i.e. subcarriers (REs) in the frequency domain. The precoding information s 1,1 , s 1,2 of the exciter port 1 is carried in one subcarrier, and the precoding information s 2,1 , s 2,2 of the exciter port 2 is carried in another subcarrier. Through such orthogonal frequency resources, different antenna ports of the exciter are distinguished. As shown in Figure 5 (b), different antenna ports of the exciter can also be distinguished through orthogonal code domain resources, and other orthogonal ways can also be adopted to distinguish the antenna ports, such as orthogonal time resources, orthogonal time / frequency / code domain resources, which are not shown in the figure. 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 Figure 5As shown in (c) of FIG. 1, the frequency resource of the excitation signal is divided into multiple parts, for example, the frequency resource is divided into 4 subcarriers in the figure, among which the middle two subcarriers are used to transmit the first reference signal for channel estimation at the receiving end, and the other parts are used to communicate with other reflectors using precoding information, and the precoding information in the figure is the product of the precoding vector and the reference signal. In fact, the middle two subcarriers of the excitation signal can use the precoding vector as Figure 5 The reference signal can be transmitted in any one of (a) or (b) of FIG. 1, and the embodiments of the present application do not make specific limitations.

[0201] For the sake of understanding, only a schematic diagram in which the exciter includes two ports is shown in the figure, but this should not cause any limitation to the present application, and the exciter can include more ports in actual operation.

[0202] The time-frequency structure of the second excitation signal will be introduced below. Figure 6 is a time-frequency structure diagram of the second excitation signal according to an embodiment of the present application. As shown in Figure 6 In the second excitation signal, the precoding information of the antenna port and the respective corresponding second reference signal can be included, and each antenna port can transmit the second excitation signal according to the respective precoding information and / or the second reference signal. The respective corresponding second reference signal of the antenna port can be the same reference signal, for example, Figure 6 s 1,1 of the exciter port 1 is multiplied by m1, and correspondingly, s 2,1 of the exciter port 2 is also multiplied by m1.

[0203] For the sake of understanding, only a schematic diagram in which the exciter includes two ports is shown in the figure, but this should not cause any limitation to the present application, and the exciter can include more ports in actual operation.

[0204] The time structure of the excitation signal and the reflection signal according to the embodiments of the present application will be introduced below. Figure 7 is a time structure schematic diagram of the excitation signal according to an embodiment of the present application. As shown in Figure 7 The excitation signal includes K OFDM symbols in the time dimension, and each OFDM symbol corresponds to a respective precoding vector S. Figure 8 is a time structure schematic diagram of the reflection signal according to an embodiment of the present application, as shown in Figure 8 The reflection data symbol is composed of a precoding vector and data, and there is a gap between L data symbols. The reflection signal can be based on the time dimension of the OFDM symbol in time, that is, the reflection signal symbol time is N OFDM symbols, where N can be a non-negative integer, or N = 1 / 2, 1 / 3, 1 / 4; or based on the reflection signal time length, that is, different from the OFDM symbol time.

[0205] The receiver, the exciter and the reflector of the embodiments of the present application will be described below in conjunction with Figure 9 to Figure 11 Figure 9 FIG. 1 is a schematic diagram of a receiver of an embodiment of the present application. As shown in FIG. 1, the receiver 900 at least includes a receiving module 910, a processing module 920 and a sending module 930. The receiving module 910 is configured to receive a first reference signal reflected by a reflector in a process in which an exciter transmits a first excitation signal; the processing module 920 is configured to estimate a channel between the exciter and the reflector and a channel between the reflector and the receiver according to the first reference signal, and obtain precoding information; the sending module 930 is configured to send the precoding information to the exciter; and the receiving module 910 is further configured to receive a data signal reflected by the reflector in a process in which the exciter transmits a second excitation signal, the second excitation signal being determined according to a signal modulated based on the precoding information. Figure 9

[0206] Optionally, in the technical solution, the receiver estimates each channel of the reflective communication according to the first reference signal to obtain the precoding information, and the exciter receives and modulates the precoding information fed back by the receiver, which can reduce the interference between the reflective communication channels and improve the performance of the data received by the receiver.

[0207] Optionally, the precoding information can be pre-modulation information respectively transmitted by each antenna port of the exciter, can be precoding information respectively transmitted by each antenna port of the exciter, or can be phase difference and / or amplitude difference information between signals respectively transmitted by each antenna port of the exciter.

[0208] Optionally, the first reference signal can be predefined by a system or configured by the exciter.

[0209] Optionally, in the process in which the exciter transmits the second excitation signal, the receiver receives a data signal reflected by the reflector and / or a second reference signal, the second excitation signal being an excitation signal generated based on the precoding information.

[0210] Optionally, the second excitation signal can also be determined according to a second reference signal respectively corresponding to each of a plurality of antenna ports, the second reference signal respectively corresponding to each of the plurality of antenna ports being a same reference signal. The second reference signal respectively corresponding to each of the plurality of antenna ports can also be different reference signals.

[0211] In the technical solution, the same interference between a plurality of signals transmitted by the excitation signal is avoided, which is conducive to the demodulation of the data signal by the receiver, thereby improving the system performance of the reflective communication.

[0212] Optionally, the second reference signal can be predefined by a system or configured by the exciter. ​​

[0213] Optionally, the receiving module 910 is further configured to receive the data signal reflected by the reflector and / or the third reference signal during the process that the exciter transmits the second excitation signal, the second excitation signal comprising the signal modulated by the precoding information, and the modulation mode can be any one of QPSK, 16QAM, 64QAM, 256QAM and 1024QAM.

[0214] In the technical solution, the exciter directly transmits the signal modulated by the precoding information, which is beneficial to improve the system performance of the reflection communication.

[0215] Optionally, the first reference signal is used by the receiver to obtain the precoding information, comprising: the receiver estimates the cascaded channel between the exciter- reflector-receiver according to the first reference signal to obtain the precoding information. The receiver can 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. Optionally, the first excitation signal comprises excitation signals corresponding to the plurality of antenna ports, and the excitation signals corresponding to the plurality of antenna ports are mutually orthogonal or quasi-orthogonal.

[0216] In the technical solution, when the excitation signals corresponding to the plurality of antenna ports are mutually orthogonal or quasi-orthogonal, it is beneficial for the receiver to perform channel estimation.

[0217] Figure 10 is a schematic diagram of the exciter of the embodiment of the present application. As shown in Figure 10 The exciter 1000 at least comprises a sending module 1010 and a receiving module 1020. The sending module 1010 is configured to send a first excitation signal, the first excitation signal being used to provide the reflector with energy and information carriers for reflecting a first reference signal to a receiver, the first reference signal being used by the receiver to obtain precoding information; the receiving module 1020 is configured to receive the precoding information from the receiver; and the sending module 1010 is further configured to send a second excitation signal, the second excitation signal comprising a signal modulated by the precoding information, the second excitation signal being used to provide the reflector with energy and information carriers for reflecting a data signal to the receiver.

[0218] Based on the above technical solution, the interference between the reflection communication channels can be reduced, and the performance of the data received by the receiving end can be improved.

[0219] Optionally, the precoding information can be the pre-modulation information respectively transmitted by each antenna port of the exciter, can be the precoding information respectively transmitted by each antenna port of the exciter, or can be the phase difference and / or amplitude difference information between the signals transmitted by each antenna port of the exciter. Optionally, the first reference signal can be predefined by the system or configured by the exciter.

[0220] Optionally, the starting time and time length of sending the first excitation signal and the second excitation signal are configured by the controller.

[0221] Optionally, the second excitation signal can also be determined according to the second reference signal corresponding to each of the plurality of antenna ports, and the second reference signal corresponding to each of the plurality of antenna ports is the same reference signal.

[0222] In the technical solution, the same interference between the plurality of signals sent by the excitation signal is avoided, which is beneficial to the demodulation of the data signal by the receiver, thereby improving the system performance of the reflection communication.

[0223] Optionally, the exciter can send the product of the precoding information modulation signal and the second reference signal.

[0224] Optionally, the second reference signal corresponding to each of the plurality of antenna ports can also be different reference signals.

[0225] Optionally, the second reference signal can be predefined by the system or configured by the exciter.

[0226] Optionally, the precoding information modulation signal includes a signal modulated by any one of the following modulation modes: QPSK, 16QAM, 64QAM, 256QAM and 1024QAM.

[0227] In the technical solution, the exciter directly sends the precoding information modulation signal, which is beneficial to improving the system performance of the reflection communication.

[0228] Optionally, the first reference signal is used by the receiver to obtain the precoding information, including: the receiver estimates the cascade channel between the exciter-reflector-receiver according to the first reference signal to obtain the precoding information. The receiver can 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.

[0229] Optionally, the first excitation signal includes excitation signals corresponding to the plurality of antenna ports, and the excitation signals corresponding to the plurality of antenna ports are mutually orthogonal or quasi-orthogonal.

[0230] In the technical solution, when the excitation signals corresponding to the plurality of antenna ports are mutually orthogonal or quasi-orthogonal, it is beneficial to the channel estimation by the receiver.

[0231] Figure 11 is a schematic diagram of a reflector of an embodiment of the present application. As Figure 11As shown, the reflector 1100 can 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 configured to receive a first excitation signal sent by an exciter, the first excitation signal being used to provide the reflector with energy and information carriers for reflecting a first reference signal to a receiver; the first reflecting module 1120 is configured to reflect, to the receiver, the first reference signal according to the first excitation signal during the process in which the exciter sends the first excitation signal, the first reference signal being used by the receiver to obtain precoding information; the second receiving module 1130 is configured to receive a second excitation signal sent by the exciter, the second excitation signal being used to provide the reflector with energy and information carriers for reflecting a data signal to the receiver; and the second reflecting module 1140 is configured to reflect, to the receiver, the data signal according to the second excitation signal during the process in which the exciter sends the second excitation signal, the second excitation signal including a signal modulated by the precoding information.

[0232] Based on the above technical solutions, the interference between reflection communication channels can be reduced, and the performance of the data received by the receiver can be improved.

[0233] Optionally, the first receiving module and the second receiving module can be the same module; and the first reflecting module and the second reflecting module can be the same module.

[0234] Optionally, the first reference signal can be predefined by a system or configured by the exciter.

[0235] Optionally, during the process in which the exciter sends the second excitation signal, the reflector reflects the data signal and / or a second reference signal, the second excitation signal being an excitation signal generated based on the precoding information.

[0236] Optionally, the second excitation signal can also be determined according to a second reference signal corresponding to each of the plurality of antenna ports, the second reference signal corresponding to each of the plurality of antenna ports being the same reference signal.

[0237] In the technical solution, the same interference between multiple signals sent by the excitation signal is avoided, which is beneficial to the demodulation of the data signal by the receiver, thereby improving the system performance of the reflection communication.

[0238] Optionally, the second reference signal can be predefined by a system or configured by the exciter.

[0239] The second reflection module is configured to reflect the data signal and / or the third reference signal during the process in which the exciter transmits the second excitation signal, the second excitation signal comprising the signal modulated by the precoding information, and the modulation mode can be any one of QPSK, 16QAM, 64QAM, 256QAM and 1024QAM.

[0240] In the technical solution, the exciter directly transmits the signal modulated by the precoding information, which is beneficial to improving the system performance of the reflection communication.

[0241] Optionally, the first reference signal is used for the receiver to obtain the precoding information, comprising: the receiver estimates the cascaded channel between the exciter, the reflector and the receiver according to the first reference signal to obtain the precoding information. The receiver can 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.

[0242] Optionally, the first excitation signal comprises excitation signals corresponding to the plurality of antenna ports, and the excitation signals corresponding to the plurality of antenna ports are orthogonal or quasi-orthogonal to each other.

[0243] In the technical solution, when the excitation signals corresponding to the plurality of antenna ports are orthogonal or quasi-orthogonal to each other, the receiver can perform channel estimation.

[0244] Those skilled in the art can realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0245] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiments, which will not be described here.

[0246] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other manners. For example, the described device embodiments are merely schematic. The division of the units is merely logical function division. There can be other division manners in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections can be indirect couplings or communication connections through some interfaces, devices or units, and can be in electrical, mechanical or other forms.

[0247] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e., can be located in one place, or can be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0248] In addition, each functional unit in the various embodiments of the present application can be integrated into a processing unit, or each unit can be a physically separate unit, or two or more units can be integrated into one unit.

[0249] If the functions are realized in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application can be embodied in the form of a software product, and the computer software product is stored in a storage medium, and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various program code storage media.

[0250] The above is merely specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method of reflective communication, characterized by, The exciter sends a first excitation signal, the first excitation signal being used to provide the reflector with energy and information carriers for reflecting a first reference signal to a receiver, the first reference signal being used by the receiver to obtain precoding information; The exciter receives the precoding information; The exciter sends a second excitation signal, the second excitation signal including a signal modulated by the precoding information, the second excitation signal being used to provide the reflector with energy and information carriers for reflecting a data signal to the receiver. The second excitation signal is determined according to a second reference signal corresponding to each of a plurality of antenna ports, the second reference signal corresponding to each of the plurality of antenna ports being a same reference signal.

2. The method of claim 1, wherein, The signal modulated by the precoding information includes a signal modulated by the precoding information in any one of the following modulation modes:

3. The method of claim 1 or 2, wherein, QPSK, 16QAM, 64QAM, 256QAM and 1024QAM. The first excitation signal includes excitation signals corresponding to the plurality of antenna ports, the excitation signals corresponding to the plurality of antenna ports being mutually orthogonal or quasi-orthogonal.

4. The method of claim 2, wherein, The reflector receives a first excitation signal sent by an exciter, the first excitation signal being used to provide the reflector with energy and information carriers for reflecting a first reference signal to a receiver; 5. A method of reflective communication, characterized by, According to the first excitation signal, the reflector reflects the first reference signal to the receiver, the first reference signal being used by the receiver to obtain precoding information, the receiver being used to send the precoding information to the exciter; The reflector receives a second excitation signal sent by the exciter, the second excitation signal being used to provide the reflector with energy and information carriers for reflecting a data signal to the receiver, the second excitation signal including a signal modulated by the precoding information; According to the second excitation signal, the reflector reflects a data signal to the receiver. The second excitation signal is determined according to a second reference signal corresponding to each of a plurality of antenna ports, the second reference signal corresponding to each of the plurality of antenna ports being a same reference signal. The signal modulated by the precoding information includes a signal modulated by the precoding information in any one of the following modulation modes:

6. The method of claim 5, wherein, QPSK, 16QAM, 64QAM, 256QAM and 1024QAM.

7. The method of claim 5 or 6, wherein, The first excitation signal includes excitation signals corresponding to the plurality of antenna ports, the excitation signals corresponding to the plurality of antenna ports being mutually orthogonal or quasi-orthogonal. The receiver receives a first reference signal reflected by a reflector according to a first excitation signal; 8. The method of claim 6, wherein, The receiver obtains precoding information according to the first reference signal; 9. A method of reflective communication, characterized by The receiver sends the precoding information to an exciter, the exciter being used to send a second excitation signal to the reflector, the second excitation signal including a signal modulated by the precoding information; The receiver receives a data signal reflected by the reflector according to the second excitation signal. ​ ​ ​ 10. The method of claim 9, wherein, The second excitation signal is determined according to a second reference signal corresponding to each of a plurality of antenna ports, and the second reference signal corresponding to each of the plurality of antenna ports is a same reference signal.

11. The method of claim 9 or 10, wherein, The signal after the pre-coding information is modulated includes a signal after the pre-coding information is modulated by any one of the following modulation modes: QPSK, 16QAM, 64QAM, 256QAM, and 1024QAM.

12. The method of claim 10, wherein, The first excitation signal includes excitation signals corresponding to the plurality of antenna ports, and the excitation signals corresponding to the plurality of antenna ports are orthogonal or quasi-orthogonal to each other.

13. An exciter characterised in that Comprise: The sending module is used for sending a first excitation signal, and the first excitation signal is used for providing a reflector with energy and an information carrier for reflecting a first reference signal to a receiver, and the first reference signal is used for the receiver to obtain pre-coding information; The receiving module is used for receiving the pre-coding information from the receiver; The sending module is also used for sending a second excitation signal, and the second excitation signal includes a signal after the pre-coding information is modulated, and the second excitation signal is used for providing the reflector with energy and an information carrier for reflecting a data signal to the receiver.

14. The exciter of claim 13, wherein, The second excitation signal is determined according to a second reference signal corresponding to each of a plurality of antenna ports, and the second reference signal corresponding to each of the plurality of antenna ports is a same reference signal.

15. An exciter as claimed in claim 13 or 14, characterised in that, The signal after the pre-coding information is modulated includes a signal after the pre-coding information is modulated by any one of the following modulation modes: QPSK, 16QAM, 64QAM, 256QAM, and 1024QAM.

16. The exciter of claim 14, wherein The first excitation signal includes excitation signals corresponding to the plurality of antenna ports, and the excitation signals corresponding to the plurality of antenna ports are orthogonal or quasi-orthogonal to each other.

17. A reflector, characterized by Comprise: The first receiving module is used for receiving a first excitation signal sent by an exciter, and the first excitation signal is used for providing a reflector with energy and an information carrier for reflecting a first reference signal to a receiver; The first reflection module is used for reflecting, according to the first excitation signal, the first reference signal to the receiver, and the first reference signal is used for the receiver to obtain pre-coding information, and the receiver is used for sending the pre-coding information to the exciter; The second receiving module is used for receiving a second excitation signal sent by the exciter, and the second excitation signal is used for providing the reflector with energy and an information carrier for reflecting a data signal to the receiver, and the second excitation signal includes a signal after the pre-coding information is modulated; The second reflection module is used for reflecting, according to the second excitation signal, the data signal to the receiver.

18. The reflector of claim 17, wherein, The second excitation signal is determined according to a second reference signal corresponding to each of a plurality of antenna ports, and the second reference signal corresponding to each of the plurality of antenna ports is a same reference signal.

19. The reflector of claim 17 or 18, wherein The signal after the pre-coding information is modulated includes a signal after the pre-coding information is modulated by any one of the following modulation modes: QPSK, 16QAM, 64QAM, 256QAM, and 1024QAM.

20. The reflector of claim 18, wherein, The first excitation signal comprises excitation signals corresponding to the plurality of antenna ports, and the excitation signals corresponding to the plurality of antenna ports are mutually orthogonal or quasi-orthogonal.

21. A receiver, comprising: Comprise: The receiving module receives a first reference signal reflected by the reflector according to a first excitation signal; The processing module is configured to obtain precoding information according to the first reference signal; The sending module is configured to send the precoding information to an exciter, and the exciter is configured to send a second excitation signal to the reflector, wherein the second excitation signal comprises a signal modulated by the precoding information; The receiving module is further configured to receive a data signal reflected by the reflector according to the second excitation signal.

22. The receiver of claim 21, wherein, The second excitation signal is determined according to a second reference signal corresponding to each of a plurality of antenna ports, and the second reference signal corresponding to each of the plurality of antenna ports is the same reference signal.

23. The receiver of 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 modes: QPSK, 16QAM, 64QAM, 256QAM and 1024QAM.

24. The receiver of claim 22, wherein, The first excitation signal comprises excitation signals corresponding to the plurality of antenna ports, and the excitation signals corresponding to the plurality of antenna ports are mutually orthogonal or quasi-orthogonal.

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