TDD 5G-based wireless digital frequency shift relay device

By designing wireless digital frequency shift relay equipment in TDD mode of 5G system, using the combination of frequency shift near-end and remote machines, the problem of signal blind spot coverage is solved, and the signal is stable transmission is achieved, with low cost and wide range. Features.

CN119210545APending Publication Date: 2024-12-27ZHEJIANG JICHUAN INFORMATION TECH CO LTD
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Patent Information

Application Number
CN202411217518.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-08-31
Publication Date
2024-12-27

AI Technical Summary

Technical Problem

In the TDD mode of 5G system, signal blind spot coverage is difficult to achieve, especially in scenarios where infrastructure is difficult to deploy and power fiber construction costs are high, the existing technology cannot effectively solve the problem of signal transmission.

Method used

Design a wireless digital frequency shift relay device based on TDD 5G, including a frequency shift near-end and remote machines. By receiving high-frequency baseband signals, it shifts frequency and converts it into a low-frequency signal that can be transmitted from a long distance, solving the signal blind spot coverage question.

Benefits of technology

It realizes the stable transmission of TDD 5G signals to the network blind spot, which has the characteristics of simple structure, low cost, strong stability and wide signal transmission range, and can effectively cover the signal blind spot.

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Abstract

The invention discloses wireless digital frequency shift relay equipment based on TDD 5G. The equipment comprises a frequency shift near-end machine and at least one frequency shift far-end machine, the frequency shift near-end machine is arranged in a network coverage range of the TDD 5G base station and is connected with the TDD 5G base station, the frequency shift far-end machine is arranged in a signal blind area, and the frequency shift far-end machine is connected with the 5G terminal; the frequency shift far-end machine is in relay wireless connection with the frequency shift near-end machine; the received high-frequency baseband signal transmitted by the TDD 5G base station is shifted into a low-frequency baseband signal capable of being remotely transmitted based on the frequency shift near-end machine, and the low-frequency baseband signal is sent to the frequency shift far-end machine; a low-frequency baseband signal sent by a frequency-shift near-end machine is shifted into a high-frequency baseband signal which can be received by a 5G terminal based on a frequency-shift far-end machine; based on the frequency shift far-end machine, the high-frequency baseband signal transmitted by the 5G terminal is shifted into the low-frequency baseband signal capable of being remotely transmitted, and the low-frequency baseband signal is sent to the frequency shift near-end machine. The frequency shift far-end machine has the characteristics of simple structure, low cost, high stability and wide signal transmission range.
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Description

Technical Field

[0001] The present invention relates to the technical field of 5G wireless digital frequency shift relay equipment, and more specifically to a wireless digital frequency shift relay equipment based on TDD5G. Background Art

[0002] With the development of mobile communication technology, especially the popularization of 5G applications, spectrum resources are becoming increasingly scarce and frequency planning bands are becoming higher and higher. The use of high frequencies has led to increasingly dense deployment of base stations, which has also created many coverage blind spots.

[0003] There are many ways to solve coverage blind spots, such as adding base stations in densely populated areas, increasing the density of indoor equipment, using fiber optic repeaters to extend the signal or amplify the signal on a single machine, etc. These methods, technologies and products are relatively mature and suitable for deployment in a variety of scenarios.

[0004] However, there are still some scenarios where the above methods cannot be used to solve the blind spot coverage problem, such as islands 20 kilometers away from the coast, wind power operation areas, desert photovoltaic operation areas far away from cities, or key forestry inspection areas. These areas have problems such as difficult deployment of infrastructure and huge costs for power fiber optic construction, which make it difficult to guarantee public network signals.

[0005] In order to meet the above scenarios, wireless frequency shift relay is required. If the 5G system is in FDD (Frequency Division Duplexing) mode, wireless analog frequency shift amplification can be used to amplify the uplink and downlink signals separately at frequencies different from the base station. This structure is relatively simple. However, most of the existing 5G systems are in TDD (Time Division Duplexing) mode. If the signal is only frequency shifted and amplified, the signal will be interfered with by the same frequency of the transmitted signal when it is received. Therefore, the transmitting power amplifier must be turned off when receiving the signal to ensure the receiving threshold. Therefore, the TDD signal also needs to be synchronized to ensure that the uplink and downlink channels do not interfere with each other. Summary of the invention

[0006] In view of this, the purpose of the present invention is to provide a wireless digital frequency shift relay device based on TDD 5G, which can shift the high-frequency baseband signal received from the TDD 5G base station into a low-frequency baseband signal that can be transmitted over a long distance and send it to the frequency shift remote machine through the frequency shift near-end machine.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] The present invention provides a wireless digital frequency shift relay device based on TDD 5G, wherein the wireless digital frequency shift relay device comprises a frequency shift near-end machine and at least one frequency shift far-end machine;

[0009] The near-end frequency shifting machine is arranged within the signal coverage of the TDD 5G base station and is connected to the TDD 5G base station by communication. The far-end frequency shifting machine is arranged in a signal blind area and is connected to the 5G terminal by communication. The far-end frequency shifting machine is connected to the near-end frequency shifting machine by wireless communication.

[0010] The frequency shifting near-end machine is used to receive the high-frequency baseband signal transmitted from the TDD 5G base station, and frequency-shift it into a low-frequency baseband signal that can be transmitted over a long distance, and send it to the frequency shifting far-end machine; the frequency shifting far-end machine is used to receive the low-frequency baseband signal sent from the frequency shifting near-end machine, and frequency-shift it into a high-frequency baseband signal that can be received by the 5G terminal;

[0011] The frequency-shifting remote machine is also used to receive high-frequency baseband signals transmitted from the 5G terminal, and frequency-shift them into low-frequency baseband signals that can be transmitted over long distances, and send them to the frequency-shifting near-end machine; the frequency-shifting near-end machine is also used to receive low-frequency baseband signals sent by the frequency-shifting remote machine, and frequency-shift them into high-frequency baseband signals for transmission to the TDD 5G base station.

[0012] Further, the frequency shifting near-end machine includes AD converter 1, AD converter 2, AD converter 3, DA converter 1, DA converter 2, FPGA unit 1, power amplifier 1, high-frequency receiving antenna 1, low-frequency transmitting antenna 1, low-frequency receiving antenna 1 and high-frequency transmitting antenna 1; the FPGA unit 1 includes DPD control module 1;

[0013] The FPGA unit 1 includes a DPD control module 1, a synchronization module 1 and a switch control module 1;

[0014] The high-frequency receiving antenna 1 is connected to an AD converter 1, and the high-frequency receiving antenna 1 receives a high-frequency baseband signal sent from a TDD 5G base station and samples it through an AD converter 1. The AD converter 1 is connected to the DPD control module 1 through a line, and is connected to the synchronization module 1 through a line. The AD converter 1 collects high-frequency baseband signals and transmits them to the DPD control module 1 and the synchronization module 1 respectively. The DPD control module 1 is connected to the DA converter 1, and the DA converter 1 is connected to the power amplifier 1. The DA converter 1 outputs a baseband low-frequency baseband signal to the power amplifier. The synchronization module 1 is connected to the switch control module 1, and the switch control module 1 is connected to the power amplifier 1. The switch control module 1 outputs a power amplifier switch control signal to control the working state of the power amplifier 1. The power amplifier 1 is connected to the low-frequency receiving antenna 1, and the low-frequency receiving antenna 1 sends a low-frequency baseband signal and transmits it to the frequency-shifting remote machine;

[0015] The AD converter 2 is connected to the power amplifier 1, and the AD converter 2 is connected to the DPD control module 1.

[0016] The low-frequency receiving antenna 1 is connected to the AD converter 3, the low-frequency receiving antenna 1 receives the low-frequency baseband signal sent from the frequency-shifting remote machine and collects it through the AD converter 3, the AD converter 3 is connected to the DA converter 2, the DA converter 2 is connected to the high-frequency transmitting antenna 1, the DA converter 2 outputs a high-frequency baseband signal, and transmits it to the TDD 5G base station through the high-frequency transmitting antenna 1.

[0017] It should be noted that: AD converter three goes to FPGA unit one and directly converts it into a baseband signal. After FPGA unit one transmits the baseband signal to DA converter two, DA converter two converts the baseband signal into a new frequency signal. This process is the capability of the AD / DA device itself.

[0018] Further, the frequency shift remote unit includes a power amplifier 2, a DA converter 3, a DA converter 4, an AD converter 4, an AD converter 5, an AD converter 6, a FPGA unit 2 and a low-frequency transmitting antenna 2, a high-frequency receiving antenna 2, a low-frequency receiving antenna 2 and a high-frequency transmitting antenna 2;

[0019] The FPGA unit 2 includes a DPD control module 2, a switch control module 2 and a synchronization module 2;

[0020] The low-frequency receiving antenna 2 is connected to the AD converter 6, and the low-frequency baseband signal transmitted from the frequency-shifting near-end machine is received through the low-frequency receiving antenna 2, and collected through the AD converter 6. The AD converter 6 is connected to the DA converter 4 through one line, and connected to the synchronization module 2 through another line. The DA converter 4 is connected to the high-frequency transmitting antenna 2, and the DA converter 4 is used to output a high-frequency baseband signal and send it to the 5G terminal through the high-frequency transmitting antenna 2. The synchronization module 2 is connected to the switch control module 2;

[0021] It should be noted that the process from AD converter 6 to DA converter 4, directly converting into baseband signal is the capability of the AD / DA device itself.

[0022] The AD converter four is connected to the high-frequency receiving antenna two, the high-frequency receiving antenna two receives the high-frequency baseband signal sent from the 5G terminal, and collects it through the AD converter four, the AD converter four is connected to the DPD control module two, the DPD control module two is connected to the DA converter three, the DA converter three is connected to the power amplifier two, the DA converter three outputs a low-frequency baseband signal to the power amplifier two, the power amplifier two is connected to the low-frequency transmitting antenna two, and the low-frequency baseband signal is transmitted to the frequency shifting near-end machine through the low-frequency transmitting antenna two;

[0023] The second synchronization module is connected to the second switch control module, the second switch control module is connected to the second power amplifier, and the second switch control module controls the working state of the second power amplifier by outputting a power amplifier switch control signal;

[0024] The power amplifier 2 is connected to the AD converter 5, and the AD converter 5 collects low-frequency baseband signals and outputs them to the DPD control module 2.

[0025] Furthermore, the high-frequency baseband signal is a 2.6 GHz TDD 5G signal, and the low-frequency baseband signal is a 600 MHz TDD 5G signal.

[0026] It can be seen from the above technical solution that, compared with the prior art, the technical effects of the present invention are:

[0027] The wireless digital frequency shifting relay device in the present invention comprises a frequency shifting near-end machine and at least one frequency shifting far-end machine; the frequency shifting near-end machine is arranged within the network coverage of the TDD 5G base station and is connected to the TDD 5G base station, the frequency shifting far-end machine is arranged in a signal blind spot, and the frequency shifting far-end machine is connected to the 5G terminal; the frequency shifting far-end machine is wirelessly connected to the frequency shifting near-end machine by relay; based on the frequency shifting near-end machine, the high-frequency baseband signal received from the TDD 5G base station is frequency shifted into a low-frequency baseband signal that can be transmitted over a long distance and sent to the frequency shifting far-end machine; based on the frequency shifting far-end machine, the low-frequency baseband signal sent by the frequency shifting near-end machine is received and frequency shifted into a high-frequency baseband signal that can be received by the 5G terminal; based on the frequency shifting far-end machine, the high-frequency baseband signal received from the 5G terminal is frequency shifted into a low-frequency baseband signal that can be transmitted over a long distance and sent to the frequency shifting near-end machine, and the frequency shifting near-end machine frequency shifts the low-frequency baseband signal sent by the frequency shifting far-end machine into a high-frequency baseband signal and transmits it to the TDD 5G base stations have the characteristics of simple structure, low cost, strong stability and wide signal transmission range, and can stably transmit TDD 5G signals to network blind spots. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0029] The wireless digital frequency shift relay device based on TDD 5G of the present invention is further described below in conjunction with the accompanying drawings;

[0030] Figure 1 This is a schematic diagram of network baseband signal transmission by a wireless digital frequency shift relay device based on TDD 5G in the present invention;

[0031] Figure 2 It is a structural schematic diagram of a frequency shift near-end device in a wireless digital frequency shift relay device based on TDD 5G in the present invention;

[0032] Figure 3 It is a schematic diagram of the structure of a frequency shift remote device in a wireless digital frequency shift relay device based on TDD 5G in the present invention;

[0033] Figure 4 It is a signal processing flow chart of the FPGA unit 1 in the near-end frequency shifter of the present invention;

[0034] Figure 5 This is a signal processing flow chart of the FPGA unit 2 in the frequency shift remote device of the present invention;

[0035] Figure 6 It is a schematic diagram of signal frequency shifting from a near-end frequency shifting machine to a far-end frequency shifting machine in a wireless digital frequency shifting relay device based on TDD 5G in the present invention;

[0036] Figure 7 It is a schematic diagram of signal frequency shifting from a frequency shifting remote end machine to a frequency shifting near end machine in a wireless digital frequency shifting relay device based on TDD 5G in the present invention;

[0037] Figure 8 It is a schematic diagram of switching a power amplifier in a wireless digital frequency shift relay device based on TDD 5G in the present invention;

[0038] Fig. 9 A schematic diagram of observing the spectrum of a transmitted signal by a near-end device in a wireless digital frequency shift relay device based on TDD 5G in the present invention;

[0039] Fig.10 It is a schematic diagram of the distance from island A area to island B area in the wireless digital frequency shift relay device based on TDD 5G in the present invention;

[0040] Fig.11 This is a schematic diagram of the communication connection between the frequency shifting near-end machine in the island A area and the frequency shifting far-end machine in the island B area in the wireless digital frequency shifting relay device based on TDD 5G in the present invention.

[0041] Among them: 1. TDD 5G base station; 2. 5G terminal. DETAILED DESCRIPTION

[0042] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0043] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0044] like Figure 1 As shown, an embodiment of the present invention discloses a wireless digital frequency shift relay device based on TDD 5G, wherein the wireless digital frequency shift relay device includes a frequency shift near-end machine and at least one frequency shift far-end machine;

[0045] The near-end frequency shifting machine is arranged within the signal coverage of the TDD 5G base station and is connected to the TDD 5G base station by communication. The far-end frequency shifting machine is arranged in a signal blind area and is connected to the 5G terminal by communication. The far-end frequency shifting machine is connected to the near-end frequency shifting machine by wireless communication.

[0046] The frequency shifting near-end machine is used to receive the high-frequency baseband signal transmitted from the TDD 5G base station, and frequency-shift it into a low-frequency baseband signal that can be transmitted over a long distance, and send it to the frequency shifting far-end machine; the frequency shifting far-end machine is used to receive the low-frequency baseband signal sent from the frequency shifting near-end machine, and frequency-shift it into a high-frequency baseband signal that can be received by the 5G terminal;

[0047] The frequency-shifting remote machine is also used to receive high-frequency baseband signals transmitted from the 5G terminal, and frequency-shift them into low-frequency baseband signals that can be transmitted over long distances, and send them to the frequency-shifting near-end machine; the frequency-shifting near-end machine is also used to receive low-frequency baseband signals sent by the frequency-shifting remote machine, and frequency-shift them into high-frequency baseband signals for transmission to the TDD 5G base station.

[0048] like Figure 2 As shown, the frequency shifting near-end machine includes AD converter 1, AD converter 2, AD converter 3, DA converter 1, DA converter 2, FPGA unit 1, power amplifier 1, high-frequency receiving antenna 1, low-frequency transmitting antenna 1, low-frequency receiving antenna 1 and high-frequency transmitting antenna 1; the FPGA unit 1 includes DPD control module 1;

[0049] like Figure 3As shown, the FPGA unit 1 includes a DPD control module 1, a synchronization module 1 and a switch control module 1;

[0050] The high-frequency receiving antenna 1 is connected to an AD converter 1, and the high-frequency receiving antenna 1 receives a high-frequency baseband signal sent from a TDD 5G base station and samples it through an AD converter 1. The AD converter 1 is connected to the DPD control module 1 through a line, and is connected to the synchronization module 1 through a line. The AD converter 1 collects high-frequency baseband signals and transmits them to the DPD control module 1 and the synchronization module 1 respectively. The DPD control module 1 is connected to the DA converter 1, and the DA converter 1 is connected to the power amplifier 1. The DA converter 1 outputs a baseband low-frequency baseband signal to the power amplifier. The synchronization module 1 is connected to the switch control module 1, and the switch control module 1 is connected to the power amplifier 1. The switch control module 1 outputs a power amplifier switch control signal to control the working state of the power amplifier 1. The power amplifier 1 is connected to the low-frequency receiving antenna 1, and the low-frequency receiving antenna 1 sends a low-frequency baseband signal and transmits it to the frequency-shifting remote machine;

[0051] The AD converter 2 is connected to the power amplifier 1, and the AD converter 2 is connected to the DPD control module 1.

[0052] The low-frequency receiving antenna 1 is connected to the AD converter 3, the low-frequency receiving antenna 3 receives the low-frequency baseband signal sent from the frequency-shifting remote machine and collects it through the AD converter 3, the AD converter 3 is connected to the DA converter 2, the DA converter 2 is connected to the high-frequency transmitting antenna 1, the DA converter 2 outputs a high-frequency baseband signal, and transmits it to the TDD 5G base station through the high-frequency transmitting antenna 1.

[0053] like Figure 4 As shown, the frequency shift remote device includes a power amplifier 2, a DA converter 2, a DA converter 4, an AD converter 4, an AD converter 5, an AD converter 6, a FPGA unit 2 and a low-frequency transmitting antenna 2, a high-frequency receiving antenna 2, a low-frequency receiving antenna 2 and a high-frequency transmitting antenna 2;

[0054] like Figure 5 As shown, the FPGA unit 2 includes a DPD control module 2, a switch control module 2 and a synchronization module 2;

[0055] The low-frequency receiving antenna 2 is connected to the AD converter 6, and the low-frequency baseband signal transmitted from the frequency-shifting near-end machine is received through the low-frequency receiving antenna 2, and collected through the AD converter 6. The AD converter 6 is connected to the DA converter 4 through one line, and connected to the synchronization module 2 through another line. The DA converter 4 is connected to the high-frequency transmitting antenna 2, and the DA converter 4 is used to output a high-frequency baseband signal and send it to the 5G terminal through the high-frequency transmitting antenna 2. The synchronization module 2 is connected to the switch control module 2;

[0056] The AD converter four is connected to the high-frequency receiving antenna two, the high-frequency receiving antenna two receives the high-frequency baseband signal sent from the 5G terminal, and collects it through the AD converter four, the AD converter four is connected to the DPD control module two, the DPD control module two is connected to the DA converter three, the DA converter three is connected to the power amplifier two, the DA converter three outputs a low-frequency baseband signal to the power amplifier two, the power amplifier two is connected to the low-frequency transmitting antenna two, and the low-frequency baseband signal is transmitted to the frequency shifting near-end machine through the low-frequency transmitting antenna two;

[0057] It should be noted that if Fig. 9 As shown: DPD control module 1 and DPD control module 2 (digital pre-distortion) mainly solve the nonlinear effect produced by the power amplifier. Because it is a TDD mode, the DPD coefficient needs to be updated every frame. The frequency shift near-end machine samples the baseband data through AD converter 2 to observe the transmitted signal.

[0058] The second synchronization module is connected to the second switch control module, the second switch control module is connected to the second power amplifier, and the second switch control module controls the working state of the second power amplifier by outputting a power amplifier switch control signal;

[0059] It should be noted that synchronization module 1 and synchronization module 1 perform time synchronization on the PSS (primary Sync signal) signal of the 5G signal, and use a cross-correlation algorithm to obtain the initial time position of the 5G frame.

[0060] The power amplifier 2 is connected to the AD converter 5, and the AD converter 5 collects low-frequency baseband signals and outputs them to the DPD control module 2.

[0061] It should be noted that if Figure 8 As shown: before the switch control module 1 and the switch control module 2 work, it is necessary to understand the uplink and downlink resource allocation ratio of the standard base station, which is usually allocated by the operator. Once the uplink and downlink resource ratio is understood, the power amplifier 1 and the power amplifier 2 can be switched on and off according to the ratio.

[0062] The high-frequency baseband signal is a 2.6 GHz TDD signal, and the low-frequency baseband signal is a 600 MHz TDD signal.

[0063] Example 1

[0064] like Figure 6 and Figure 7 As shown in the figure, 1. A certain operator uses 2.6GHz 5G TDD, and the coverage radius of a single base station is about 500m-1000m; Fig.10 and Fig.11 As shown: 2. A large island A has the operator's base station, which can ensure coverage of the island and its surrounding areas. However, a small island B 20 kilometers away from the island has no base station coverage. Island B has certain Internet needs, and the cost of deploying base stations by pulling submarine optical fibers is too high; 3. Use frequency shift relay to provide signal coverage for Island B. The operator's 2.6GHz standard TDD signal is converted into a high-power 600MHz TDD signal through a digital frequency shift near-end machine, and forwarded to Island B 20 kilometers away by taking advantage of the long transmission distance of 600MHz. The digital frequency shift far-end machine converts the 600MHz signal into 2.6GHz, so that the 5G terminal in the island B area can be connected to the standard base station of Island A 20 kilometers away.

[0065] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wireless digital frequency shift relay device based on TDD 5G, characterized in that: It includes a near-end frequency shifting machine and at least one far-end frequency shifting machine; The near-end frequency shifting machine is arranged within the signal coverage of the TDD 5G base station and is connected to the TDD 5G base station by communication. The far-end frequency shifting machine is arranged in a signal blind area and is connected to the 5G terminal by communication. The far-end frequency shifting machine is connected to the near-end frequency shifting machine by wireless communication. The frequency shifting near-end machine is used to receive the high-frequency baseband signal transmitted from the TDD 5G base station, and frequency-shift it into a low-frequency baseband signal that can be transmitted over a long distance, and send it to the frequency shifting far-end machine; the frequency shifting far-end machine is used to receive the low-frequency baseband signal sent from the frequency shifting near-end machine, and frequency-shift it into a high-frequency baseband signal that can be received by the 5G terminal; The frequency-shifting remote machine is also used to receive high-frequency baseband signals transmitted from the 5G terminal, and frequency-shift them into low-frequency baseband signals that can be transmitted over long distances, and send them to the frequency-shifting near-end machine; the frequency-shifting near-end machine is also used to receive low-frequency baseband signals sent by the frequency-shifting remote machine, and frequency-shift them into high-frequency baseband signals for transmission to the TDD 5G base station.

2. The wireless digital frequency shift relay device based on TDD 5G according to claim 1, characterized in that: The frequency shifting near-end machine includes AD converter 1, AD converter 2, AD converter 3, DA converter 1, DA converter 2, FPGA unit 1, power amplifier 1, high-frequency receiving antenna 1, low-frequency transmitting antenna 1, low-frequency receiving antenna 1 and high-frequency transmitting antenna 1; The FPGA unit 1 includes a DPD control module 1, a synchronization module 1 and a switch control module 1; The high-frequency receiving antenna 1 is connected to an AD converter 1, and the high-frequency receiving antenna 1 receives a high-frequency baseband signal sent from a TDD 5G base station and samples it through an AD converter 1. The AD converter 1 is connected to the DPD control module 1 through a line and connected to the synchronization module 1 through another line. The AD converter 1 collects high-frequency baseband signals and transmits them to the DPD control module 1 and the synchronization module 1 respectively. The DPD control module 1 is connected to the DA converter 1, and the DA converter 1 is connected to the power amplifier 1. The DA converter 1 outputs a baseband low-frequency baseband signal to the power amplifier 1. The synchronization module 1 is connected to the switch control module 1, and the switch control module 1 is connected to the power amplifier 1. The switch control module 1 outputs a power amplifier switch control signal to control the working state of the power amplifier 1. The power amplifier 1 is connected to the low-frequency receiving antenna 1, and the low-frequency receiving antenna 1 sends a low-frequency baseband signal and transmits it to the frequency-shifting remote machine; The AD converter 2 is connected to the power amplifier 1, and the AD converter 2 is connected to the DPD control module 1; The low-frequency receiving antenna 1 is connected to the AD converter 3, the low-frequency receiving antenna 1 receives the low-frequency baseband signal sent from the frequency-shifting remote machine and collects it through the AD converter 3, the AD converter 3 is connected to the FPGA unit 1, the FPGA unit 1 is connected to the DA converter 2, the DA converter 2 is connected to the high-frequency transmitting antenna 1, the DA converter 2 outputs a high-frequency baseband signal, and transmits it to the TDD 5G base station through the high-frequency transmitting antenna 1.

3. The wireless digital frequency shift relay device based on TDD 5G according to claim 1, characterized in that: The frequency shift remote device includes a power amplifier 2, a DA converter 3, a DA converter 4, an AD converter 4, an AD converter 5, an AD converter 6, a FPGA unit 2, a low-frequency transmitting antenna 2, a high-frequency receiving antenna 2, a low-frequency receiving antenna 2 and a high-frequency transmitting antenna 2; The FPGA unit 2 includes a DPD control module 2, a switch control module 2 and a synchronization module 2; The low-frequency receiving antenna 2 is connected to the AD converter 6, and the low-frequency baseband signal transmitted from the frequency-shifting near-end machine is received through the low-frequency receiving antenna 2, and collected through the AD converter 6. The AD converter 6 is connected to the FPGA unit 2 through one line, the FPGA unit 2 is connected to the DA converter 4, and is connected to the synchronization module 2 through another line, and the synchronization module 2 is connected to the switch control module 2; the DA converter 4 is connected to the high-frequency transmitting antenna 2, and the DA converter 4 is used to output a high-frequency baseband signal and send it to the 5G terminal through the high-frequency transmitting antenna 2; The AD converter four is connected to the high-frequency receiving antenna two, the high-frequency receiving antenna two receives the high-frequency baseband signal sent from the 5G terminal, and collects it through the AD converter four, the AD converter four is connected to the DPD control module two, the DPD control module two is connected to the DA converter three, the DA converter three is connected to the power amplifier two, the DA converter three outputs a low-frequency baseband signal to the power amplifier two, the power amplifier two is connected to the low-frequency transmitting antenna two, and the low-frequency baseband signal is transmitted to the frequency-shifting near-end machine through the low-frequency transmitting antenna two; The switch control module 2 is connected to the power amplifier 2, and the switch control module 2 controls the working state of the power amplifier 2 by outputting a power amplifier switch control signal; The power amplifier 2 is connected to the AD converter 5, and the AD converter 5 collects low-frequency baseband signals and outputs them to the DPD control module 2.

4. The wireless digital frequency shift relay device based on TDD 5G according to claim 2 or 3, characterized in that: The high-frequency baseband signal is a 2.6 GHz TDD 5G signal, and the low-frequency baseband signal is a 600 MHz TDD 5G signal.