Full-duplex short-range point-to-point millimeter wave communication system and method

Abstract

The present application mainly relates to the technical field of millimeter wave communication, and provides a full-duplex short-distance point-to-point millimeter wave communication system and method, which aims to overcome the leakage interference caused by the leakage of the transmitted signal and realize full-duplex short-distance point-to-point millimeter wave communication transmission without relying on external systems for signal transceiving control; the core of the present application is that a phase shift calibrator and a phase shifter are arranged, the phase shift calibrator calculates the phase shift value of the phase shifter according to the self-interference signal strength and the set phase calibration strategy, and writes the phase shift value into the phase shifter; the phase shifter adjusts the initial phase of the local oscillator signal generated by the local oscillator to ensure that the initial phase is orthogonal to the initial phase of the self-interference signal; the energy of the self-interference signal is located on the 2 times carrier frequency and is suppressed by band-pass filtering, and through subsequent wave shaping, the target signal sent by the opposite node is obtained, and in the full-duplex simultaneous transceiving mode, the target signal sent by the opposite node can still be stably and reliably demodulated from strong interference.

Description

TECHNICAL FIELD

[0001] The present application mainly relates to the field of millimeter wave communication technology, in particular to a full-duplex short-range point-to-point millimeter wave communication system and method. BACKGROUND

[0002] With the increasing demand for short-range high-speed data interaction, in point-to-point communication at ultra-short distances (a few centimeters), millimeter wave communication technology is often used to get rid of the need for physical cables and connectors. In low-cost short-range point-to-point millimeter wave communication, on-off keying modulation (OOK modulation) is often used to simplify system complexity and power consumption, so the application prospect of wireless scenarios of wired interfaces such as USB, Ethernet, HDMI, UART, etc. is becoming more and more extensive. For example, patents CN204559736U, CN118316770A and ST60A3 products produced by STMicroelectronics all use such a scheme. However, OOK modulation has inherent technical defects:

[0003] (1) The transmitted signal has serious energy leakage in the frequency domain, and the spurious radiation generated is difficult to meet the strict radio regulation requirements, usually an additional spurious suppression filter needs to be introduced in the transmission path, which increases the cost and design complexity of the system;

[0004] (2) The existing OOK communication scheme generally uses time division duplex mode (TDD mode) to realize bidirectional communication. TDD mode requires high-speed switching between transmission and reception states of the communication node. Therefore, the system must rely on an external master chip to provide a clear transmit-receive state control signal for interface adaptation. However, most existing wired interface standards do not define such a transmit-receive control signal, and the existing system needs to be adapted in terms of transmit-receive state control, which has great resistance in the application ecosystem;

[0005] (3) In addition, the existing wired interface is usually full-duplex communication, that is, simultaneous transmission and reception of data, such as USB3.0 which uses Tx data line and Rx data line to realize full-duplex transmission. For millimeter wave communication, if transmission and reception are performed simultaneously, self-interference problems caused by leakage of the transmitted signal to the receiving path will inevitably occur; in the millimeter wave frequency band, this problem is particularly prominent, however, existing interference suppression techniques are often complex and expensive, such as self-interference cancellation technology, which is difficult to apply in low-cost, low-power short-range communication scenarios.

[0006] Therefore, there is an urgent need for a millimeter wave communication system and method that can realize full-duplex communication without relying on external transmit-receive control signals, effectively suppress transmission leakage interference, and have flexible spurious radiation control capability. SUMMARY

[0007] The technical problem solved by the present application is to provide a full-duplex short-range point-to-point millimeter wave communication system and method, aiming to overcome the leakage self-interference problem caused by the leakage of the transmitted signal without relying on external systems for signal transceiver control, and realize full-duplex short-range point-to-point millimeter wave communication transmission.

[0008] The technical solution adopted by the present application to solve the above technical problem is:

[0009] In one aspect, the present application provides a full-duplex short-range point-to-point millimeter wave communication system, which comprises:

[0010] A local oscillator is used to generate a carrier signal for the signal transmitting module and a local oscillator signal for the signal receiving module.

[0011] A signal transmitting module is used to modulate the wired waveform emitted by the current node onto the carrier signal to generate a modulated signal, and the modulated signal adopts amplitude modulation.

[0012] An amplification radiation unit is connected with the signal transmitting module and is used to radiate the modulated signal into the environment and receive the millimeter wave electromagnetic signal in the environment, wherein the millimeter wave electromagnetic signal in the environment is a composite signal of the self-interference signal generated based on the leakage of the modulated signal and the target signal emitted by the opposite node.

[0013] A phase shift calibrator and a phase shifter are provided, wherein the phase shift calibrator is used to calculate the phase shift value of the phase shifter according to the self-interference signal strength and the set phase calibration strategy, and the phase shifter is used to adjust the phase of the local oscillator signal according to the phase shift value.

[0014] A signal receiving module is used to suppress the self-interference signal in the composite signal based on the phase-adjusted local oscillator signal, and to rectify the signal after interference suppression to obtain the target signal.

[0015] Further, the signal transmitting module comprises an up-conversion frequency mixer, which is used to modulate the wired waveform emitted by the current node onto the carrier signal generated by the local oscillator to generate a modulated signal.

[0016] Further, the signal transmitting module further comprises a depolarizer, which is used to convert the wired waveform in the form of a bipolar code into a unipolar code waveform.

[0017] Further, the signal transmitting module further comprises a spurious suppressor, which is used to filter out the high-frequency components of the unipolar code waveform.

[0018] Further, the phase calibration strategy of the phase shifter calibrator is that the phase shifter calibrator acquires the phase shift value that makes the average power value of the envelope wave detection signal in the signal receiving module minimum by using the traversal optimization method, the gradient descent method or the dichotomy method, and writes the phase shift value into the phase shifter.

[0019] Further, the signal receiving module comprises a down-conversion frequency mixer, a band-pass filter and an envelope detector; the down-conversion frequency mixer is used for receiving the synthesized signal generated by the amplification radiation unit and the local oscillator signal adjusted in phase by the phase shifter, and down-converts the synthesized signal to an intermediate frequency; after the band-pass filter extracts the intermediate frequency signal, the envelope detector performs envelope detection on the intermediate frequency waveform to obtain an envelope waveform.

[0020] Further, the signal receiving module further comprises a binary quantization module, the binary quantization module comprises a threshold generator and a decision maker, the threshold generator is used for generating a voltage decision threshold, and the decision maker is used for comparing the envelope waveform with the voltage decision threshold and outputting a target signal;

[0021] The threshold generator generating the voltage decision threshold comprises: after the envelope waveform is subjected to direct current filtering, taking zero voltage as the decision threshold, or taking the average value of the historical envelope value as the decision threshold.

[0022] Further, the amplification radiation unit comprises an antenna, a power amplifier and a low noise amplifier; the antenna adopts a planar end-fire antenna, a slot antenna or a planar edge-fire antenna; wherein the transceiving antenna is a separate antenna with orthogonal polarization or a high-isolation dual-polarized antenna.

[0023] Further, the difference between the carrier frequencies of the modulation signal and the target signal is not less than wherein is the symbol period of the modulation signal, is the symbol period of the target signal.

[0024] Further, the polarization directions of the modulation signal and the target signal are orthogonal.

[0025] In another aspect, the application also provides a full-duplex short-range point-to-point millimeter wave communication method, the method comprising:

[0026] The phase shifter calibrator calculates the phase shift value of the phase shifter according to the self-interference signal strength and the set phase calibration strategy, and configures the phase shifter based on the calculated phase shift value;

[0027] The signal transmitting module modulates the wired waveform emitted by the current node onto the carrier signal to generate a modulation signal; the amplification radiation unit radiates the modulation signal to the environment, and generates a synthesized signal by superimposing the self-interference signal generated based on the modulation signal and the target signal emitted by the opposite node;

[0028] The signal receiving module suppresses the self-interference signal in the synthesized signal based on the phase-adjusted local oscillator signal of the phase shifter, and performs wave rectification on the interference-suppressed signal to obtain a target signal.

[0029] Further, the method further comprises: after the phase shifter performs phase calibration in the cold start process, the phase of the phase shifter remains constant, or compensation adjustment is performed based on the drift of the phase value with temperature change.

[0030] The application has the advantages that: only the full-duplex short-distance point-to-point millimeter wave communication system and the wired interface are needed to be connected for data path docking, without other interface and system adaptation, full-duplex non-inductive transmission of the wired interface is realized, and the best phase point can be automatically and accurately searched and locked, the strong leakage interference of the self-transmitted signal is effectively cancelled in the signal receiving module, so that the weak opposite useful signal can be stably and reliably demodulated from the strong interference in the full-duplex simultaneous transmitting and receiving mode, and the application of the short-distance point-to-point millimeter wave communication technology is expanded. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a schematic diagram of a point-to-point millimeter wave wireless communication link;

[0032] Figure 2 It is a logic block diagram of a transmitting and receiving path in a millimeter wave communication node;

[0033] Figure 3 It is a schematic diagram of a full-duplex short-distance point-to-point millimeter wave communication system structure;

[0034] Figure 4 It is a structure block diagram of an amplification radiation unit;

[0035] Figure 5 It is a logic structure diagram of the voltage decision threshold generated by the binary quantization module based on the filtering method;

[0036] Figure 6 It is a logic structure diagram of the voltage decision threshold generated by the binary quantization module based on the threshold estimation method. DETAILED DESCRIPTION

[0037] The core of the full-duplex short-range point-to-point millimeter wave communication system and method for solving the above technical problems is that signal transmission and signal reception are performed simultaneously in full-duplex transmission, when the current node radiates and transmits a signal to the environment through an amplification radiation unit, the amplification radiation unit also receives a target signal of the opposite node from the environment, in the process of receiving the target signal of the opposite node, the amplification radiation unit inevitably collects the transmitted signal radiated by the amplification radiation unit to the environment, forming a leakage self-interference from transmission to reception, the leakage self-interference is usually formed in a circuit or structure, and the strength thereof is far greater than the strength of the target signal transmitted by the opposite node, in order to suppress the strong leakage self-interference, the present application calculates a phase shift value of a phase shifter according to the strength of the self-interference signal and a set phase calibration strategy through a phase shift calibrator, writes the phase shift value into the phase shifter, and then calibrates the phase of the phase shifter, the phase shifter adjusts the initial phase of the local oscillator signal generated by the local oscillator according to the calibrated phase, so as to ensure that the initial phase is orthogonal to the initial phase of the self-interference signal, the energy of the self-interference signal is located at 2 times the carrier frequency, is suppressed by a band-pass filter, and the target signal transmitted by the opposite node is obtained through subsequent wave shaping.

[0038] In order for those skilled in the art to better understand the present application, the scheme in the present embodiment will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments.

[0039] Figure 1 The present application is a typical application scenario diagram of the full-duplex short-range point-to-point millimeter wave communication system. The communication link of the typical application scenario includes two communication nodes (wired interface #1 and wired interface #2) of the current node and the opposite node, and the connection of the input and output (millimeter wave communication node #1 and millimeter wave communication node #2) between the two communication nodes is established through the full-duplex short-range point-to-point millimeter wave communication system described in the present application, which is used to replace the traditional physical wired interface. The carrier frequencies between the two communication nodes are different, and preferably differ by not less than , is the period of the binary level of the current node Tx input waveform, that is, the symbol period of the modulation signal of the current node, is the period of the binary level of the opposite node input waveform, that is, the symbol period of the target signal of the opposite node.

[0040] The full-duplex short-range point-to-point millimeter wave communication system described in the present application is shown in Figure 2 , which includes a local oscillator (OL), a signal transmission module, an amplification radiation unit, a phase shift calibrator, a phase shifter and a signal reception module.

[0041] The local oscillator is used to generate a carrier signal for the signal transmitting module and a local oscillator signal for the signal receiving module (the carrier signal and the local oscillator signal are the respective signal names of the local oscillator generated signals in the signal transmitting module and the signal receiving module) ; the signal transmitting module is used to modulate the waveform (Tx) of the current node onto the carrier signal to generate a modulated signal; the amplification and radiation unit is connected with the signal transmitting module and is used to receive a synthesized signal generated based on the modulated signal and a target signal emitted by the opposite node; the phase shift calibrator is used to calculate the phase shift value of the phase shifter according to the self-interference signal strength and the set phase calibration strategy, and the phase shifter adjusts the phase of the local oscillator signal according to the phase shift value; the signal receiving module suppresses the self-interference signal in the synthesized signal based on the phase-adjusted local oscillator signal, and rectifies the signal after interference suppression to obtain an output waveform (Rx), which is the target signal emitted by the opposite node.

[0042] As shown in Figure 3 The signal transmitting module includes an up-conversion mixer (TxMixer), and the signal of the current node is a binary level signal derived from a wired interface such as USB, HDMI, etc., which only contains two valid levels. In common wired interfaces, there are both unipolar codes and bipolar codes. If the wired interface served by the system is a bipolar code, the input signal is a differential waveform, and a depolarizer is needed to convert it into a unipolar code. Therefore, in this case, the signal transmitting module further includes a depolarizer. The depolarizer can be realized by a high-speed voltage comparator, and the implementation logic is as follows: if the differential waveform is a positive voltage, a high level is output, and if it is a negative voltage, a low level is output; if the voltage of the low level is greater than zero, it is called a bias unipolar code, and the voltage of the low level is called a bias voltage.

[0043] The spectrum leakage of the unipolar code is defined by a sinc function. In order to meet the requirements of radio regulations on spurious radiation, a spurious suppressor can be set to perform band-limit filtering as needed; from the cost consideration, the spurious suppressor is realized by a 2~4 order passive filter to suppress the energy of the sidelobes of the sinc function in the frequency domain, and to ensure that the subsequent radiated signal meets the requirements of FCC and other regulations.

[0044] The output signal of the spurious suppressor is up-converted to a radio frequency by the carrier signal generated by the local oscillator in the up-conversion mixer to generate a modulated signal, which enters the amplification and radiation unit. The amplification and radiation unit amplifies the modulated signal and radiates it into the environment. At the same time, the amplification and radiation unit also continuously receives electromagnetic wave signals, which are synthesized signals, specifically including two parts, one part is the target signal from the opposite node, and the other part is the self-interference signal generated based on the modulated signal leakage.

[0045] As shown in Figure 4As shown, the amplification radiation unit includes an antenna, a power amplifier (PA) and a low noise amplifier (LNA), wherein the power amplifier and the low noise amplifier are optional devices. The antenna in the amplification radiation unit adopts a planar end-fire antenna, a slot antenna or a planar edge-fire antenna; wherein the transceiving antenna is a separate antenna of orthogonal polarization or a high-isolation dual-polarized antenna.

[0046] In order to suppress the self-interference signal, a phase shift calibrator and a phase shifter are arranged between the local oscillator and the signal receiving module. The phase shift calibrator continuously samples the envelope waveform at the end of the signal receiving module, evaluates the interference intensity of the self-interference signal, and calculates the phase shift value of the phase shifter according to the interference intensity and the set phase calibration strategy.

[0047] The phase shift calibrator calculates the average power value of the envelope wave detection signal, uses the traversal optimization method, the gradient descent method or the dichotomy method to obtain the phase shift value that makes the average power value minimum as the optimal phase shift value, and configures the optimal phase shift value to the phase shifter.

[0048] Specifically, the dichotomy method for obtaining the optimal phase shift value includes: the phase shift calibrator controls the phase shifter to be configured at the midpoint (180°) of the adjustable phase range (such as 0° to 360°) of the phase shifter, measures and records the envelope average power value V_avg1; then, measures at two phase points of 90° and 270° to obtain V_avg2 and V_avg3. By comparing V_avg1, V_avg2 and V_avg3, it can be judged that the optimal phase point that makes the average power value minimum is located in which 90° interval. Then, dichotomy search is performed again in the interval selected in the previous step. According to this process, iteration is performed until the difference between the average power values measured continuously for two times is less than a preset threshold (for example, the amplitude change caused by 1° phase change), at which time it is considered that the optimal phase point has been found, and the phase shifter is locked at this configuration.

[0049] Specifically, the traversal optimization method for obtaining the optimal phase shift value includes: traversing all preset phase shift values of the phase shifter, measuring the average power value of the envelope signal under each configuration, and selecting the phase with the minimum average power value of the envelope signal as the optimal phase point after the traversal is completed, and locking the phase shifter at this configuration.

[0050] As a preferred, the phase shifter calibration is performed in the cold start process to obtain the optimal phase shift value. During the phase shifter calibration process, the de-polarity device maintains a constant output high level, while ensuring that the phase shift calibrator can not be disturbed by signals from the opposite node and other factors. In the calibration stage of the phase shifter, the expression of the self-interference signal is: where A(t) is a transmission waveform, f c is a carrier frequency point, is the initial phase of the self-interference signal, is the propagation delay of the self-interference signal; the expression of the local oscillator signal after phase adjustment by the phase shifter is , wherein is the initial phase of the carrier signal after adjustment by the phase shifter.

[0051] As shown in Figure 3 , the signal receiving module includes a down-conversion mixer (RxMixer), a band-pass filter, an envelope detector, and a binary quantization module. The output signal of the down-conversion mixer is: , wherein the former term on the right side of the equation is at twice the carrier frequency and is suppressed by the band-pass filter, and the latter term is at zero frequency, and the phase configuration of the phase shifter is such that is equal to ±90°, so that this term of energy tends to zero, that is, the suppression of the self-interference signal can be achieved by adjusting the phase shift value of the phase shifter. The binary quantization module is an optional device in the signal receiving module, and its function is to output a clear binary level signal.

[0052] The phase of the phase shifter is locked at , and in the process of communication between the current node and the opposite node, the down-conversion mixer mixes the synthesized signal and the local oscillator signal after phase adjustment by the phase shifter, the high-frequency component is filtered out by the band-pass filter, and the intermediate frequency waveform is obtained after down-conversion. After the band-pass filter extracts the intermediate frequency signal, the envelope detector performs envelope detection on the intermediate frequency waveform to obtain the envelope waveform, and the binary quantization module performs binary processing on the envelope wave to obtain the target signal.

[0053] As a preferred embodiment, the upper and lower cutoff frequencies of the band-pass filter need to be as close as possible to the edges of the signal transmitted by the opposite node, so as to achieve the best suppression of leakage self-interference, blocking interference, noise, etc., and obtain the purest intermediate frequency receiving signal.

[0054] The binary quantization module includes a threshold generator and a decision maker, the threshold generator is used to generate a voltage decision threshold, and the decision maker is used to compare the envelope waveform with the decision threshold and output the target signal; the threshold generator generating the voltage decision threshold includes: as shown in Figure 5 , after the envelope waveform is filtered to remove the direct current, the zero voltage is used as the voltage decision threshold, or as shown in Figure 6 , the average power value of the historical envelope value is obtained as the voltage decision threshold. The output of the binary decision can be selected as bipolar output or unipolar output according to the requirement, so as to adapt to the electrical characteristic requirements of the wired interface.

[0055] As a preferred embodiment, after the phase calibration of the phase shifter during the cold start process, the optimal phase of the phase shifter can be kept constant, or the compensation adjustment can be made based on the drift of the phase value with temperature change.

[0056] Embodiment: This embodiment takes USB3.1 as an example to further explain the full-duplex short-range point-to-point millimeter wave communication system and method of the present application.

[0057] There are two groups of differential pairs in USB3.1, called Tx differential pair and Rx differential pair, the former connects the Tx port of the system, and the latter connects the Rx port of the system.

[0058] Cold start calibration: after cold start, first perform phase shifter calibration, specifically, the phase shifter calibrator controls the depolarizer to output high level, traverses all gear configurations of the phase shifter, and measures the average power value of the envelope waveform under each gear configuration, selects the phase shifter gear with the minimum average power value as the phase shifter calibration result. After writing the phase calibration result into the phase shifter, the calibration process is completed.

[0059] After the USB A device and the USB B device complete the start calibration, the USB A device sends data to the USB B device as follows:

[0060] The output signal flow of the USB A device: the signal waveform on the Tx differential pair of USB3.1 is a bipolar code, which is converted into a unipolar code waveform through the depolarizer, the unipolar code waveform is sent into the spur suppressor to filter out high-frequency components to prevent electromagnetic radiation from exceeding regulatory requirements (at this time, the output of the spur suppressor is no longer a binary level), the output of the spur suppressor enters the up-conversion mixer and is up-converted to the carrier frequency by the local oscillator, generating a modulated signal, and entering the environment through the amplification radiation unit.

[0061] The flow of the USB B device receiving signal: the amplification radiation unit receives the synthesized signal from the environment, the synthesized signal enters the down-conversion mixer, the down-conversion mixer mixes the synthesized signal and the local oscillator signal after phase adjustment by the phase shifter, the high-frequency components are filtered out by the band-pass filter, and the envelope detector performs envelope detection on the intermediate frequency waveform to obtain the envelope waveform, the envelope waveform is input into the binary quantization module, the binary quantization module performs direct current filtering on the envelope waveform, and the direct current filtering output waveform is restored to a binary level signal, if it is a positive level, a positive voltage is applied to the Rx differential line of USB3.1, and if it is a negative level, a negative voltage is applied to the Rx differential line of USB3.1.

[0062] The flow of the USB B device sending data to the USB A device is the same as above, which will not be described in particular here.

Claims

1. A full-duplex short-range point-to-point millimeter-wave communication system, characterized in that, The system includes: The local oscillator is used to generate carrier signals for the signal transmitting module and local oscillator signals for the signal receiving module. The signal transmission module is used to modulate the wired waveform emitted by the current node onto the carrier signal to generate a modulated signal, wherein the modulated signal adopts amplitude modulation. The amplification and radiation unit, connected to the signal transmission module, is used to radiate the modulated signal into the environment and receive the millimeter-wave electromagnetic signal in the environment. The millimeter-wave electromagnetic signal in the environment is a composite signal of the self-interference signal generated based on the leakage of the modulated signal and the target signal emitted by the counterpart node. A phase shift calibrator and a phase shifter, wherein the phase shift calibrator is used to calculate the phase shift value of the phase shifter based on the self-interference signal strength and the set phase calibration strategy, and the phase shifter is used to adjust the phase of the local oscillator signal based on the phase shift value; The signal receiving module suppresses self-interference signals in the synthesized signal based on the phase-adjusted local oscillator signal, and then performs rectification on the interference-suppressed signal to obtain the target signal. The signal receiving module includes a down-conversion mixer and an envelope detector. The down-conversion mixer is used to receive the synthesized signal generated by the amplification and radiation unit and the local oscillator signal after phase adjustment by the phase shifter, and down-converts the synthesized signal to an intermediate frequency. The envelope detector performs envelope detection on the intermediate frequency waveform to obtain the envelope waveform.

2. The full-duplex short-range point-to-point millimeter-wave communication system according to claim 1, characterized in that, The signal transmission module includes an up-conversion mixer, which is used to modulate the wired waveform emitted by the current node onto the carrier signal generated by the local oscillator to generate a modulated signal.

3. The full-duplex short-range point-to-point millimeter-wave communication system according to claim 2, characterized in that, The signal transmission module also includes a depolarizer, which is used to convert a bipolar code-shaped wired waveform into a unipolar code waveform.

4. The full-duplex short-range point-to-point millimeter-wave communication system according to claim 2, characterized in that, The signal transmission module also includes a spurious suppressor, which is used to filter out high-frequency components of the unipolar code waveform.

5. The full-duplex short-range point-to-point millimeter-wave communication system according to claim 1, characterized in that, The phase calibration strategy of the phase shift calibrator is as follows: the phase shift calibrator uses the ergonomic selection method, gradient descent method or bisection method to obtain the phase shift value that minimizes the average power value based on the average power value of the envelope wave detection signal in the signal receiving module, and writes the phase shift value into the phase shifter.

6. The full-duplex short-range point-to-point millimeter-wave communication system according to claim 1, characterized in that, The signal receiving module also includes a bandpass filter, which is used to extract the intermediate frequency signal from the downconverter mixer and transmit it to the envelope detector.

7. The full-duplex short-range point-to-point millimeter-wave communication system according to claim 6, characterized in that, The signal receiving module further includes a binary quantization module, which includes a threshold generator and a decision unit. The threshold generator is used to generate a voltage decision threshold, and the decision unit is used to compare the envelope waveform with the voltage decision threshold and output the target signal. The threshold generator generates voltage decision thresholds including: after DC blocking filtering of the envelope waveform, using zero voltage as the decision threshold, or obtaining the average value of historical envelope values ​​as the decision threshold.

8. The full-duplex short-range point-to-point millimeter-wave communication system according to claim 1, characterized in that, The amplification and radiation unit includes an antenna, a power amplifier, and a low-noise amplifier; the antenna is a planar end-fire antenna, a slot antenna, or a planar side-fire antenna; wherein the transmitting and receiving antennas are orthogonally polarized split antennas or high-isolation dual-polarized antennas.

9. The full-duplex short-range point-to-point millimeter-wave communication system according to any one of claims 1-8, characterized in that, The difference between the carrier frequencies of the modulating signal and the target signal is not less than ,in It is the symbol period of the modulated signal. It is the symbol period of the target signal.

10. The full-duplex short-range point-to-point millimeter-wave communication system according to any one of claims 1-8, characterized in that, The polarization directions of the modulating signal and the target signal are orthogonal.

11. A full-duplex short-range point-to-point millimeter-wave communication method, applied to the full-duplex short-range point-to-point millimeter-wave communication system according to any one of claims 1-10, characterized in that, The method includes: The phase shift calibrator calculates the phase shift value of the phase shifter based on the self-interference signal strength and the set phase calibration strategy, and configures the phase shifter based on the calculated phase shift value; The signal transmission module modulates the wired waveform emitted by the current node onto the carrier signal to generate a modulated signal; The amplification and radiation unit radiates the modulated signal into the environment, and generates a composite signal by superimposing the self-interference signal generated by the modulated signal with the target signal emitted by the counterpart node. The signal receiving module uses the local oscillator signal after phase adjustment by the phase shifter to suppress the self-interference signal in the synthesized signal, and then performs rectification on the interference-suppressed signal to obtain the target signal.

12. The full-duplex short-range point-to-point millimeter-wave communication method according to claim 11, characterized in that, The method further includes: after the phase shifter is calibrated during cold start, the phase of the phase shifter remains constant, or compensation adjustment is made based on the drift of the phase value caused by temperature change.

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