CN118074741A

CN118074741A - TDD-based 5G-R railway communication system

Info

Publication number: CN118074741A
Application number: CN202410193990.9A
Authority: CN
Inventors: 陈恩
Original assignee: Comlab Beijing Communication System Equipment Co ltd
Current assignee: Comlab Beijing Communication System Equipment Co ltd
Priority date: 2024-02-21
Filing date: 2024-02-21
Publication date: 2024-05-24

Abstract

The application provides a 5G-R railway communication system based on TDD, comprising: the device comprises a control module, a first signal calibration module, a plurality of receiving diversity channels and a plurality of TDD signal receiving and transmitting channels; the receiving signal input end of the control module is coupled with the signal output end of any receiving diversity channel; the receiving and transmitting signal input end of the control module is coupled with the receiving and transmitting signal output end of any one TDD signal receiving and transmitting path; the receiving and transmitting signal output end of the control module is coupled with the receiving and transmitting signal input end of any one TDD signal receiving and transmitting path; one end of the first signal calibration module is used for collecting antenna signals of a plurality of TDD signal receiving and transmitting paths, and the other end of the first signal calibration module is coupled with the control module. By the method, the problem that the TDD technology and the 5G-R technology cannot be well combined when the 5G-R technology is researched by avoiding the defects of the GSM-R communication technology is solved.

Description

TDD-based 5G-R railway communication system

Technical Field

The application relates to the technical field of railway communication, in particular to a 5G-R railway communication system based on TDD.

Background

Railway communication mainly comprises communication technologies such as GSM-R, 4G/5G and the like. The GSM-R is a special communication system widely used by railways, has been applied to the lines of Qinghai-Tibet line, daqin line, fraxinus line and the like, and realizes the safe running of trains, the establishment of in-car and railway control central systems and the interconnection with emergency rescue departments. Because of the narrow bandwidth (such as 4MHz for each of the uplink and downlink of China GSM-R), the GSM-R communication technology is mainly applied to the interactive scene of train control and command transmission, and cannot develop high-speed, large-capacity, real-time and reliable service application based on broadband.

With the continuous development of communication technology, 5G-R technology is gradually brought up to the front end of research and development of railway communication technology, and 5G-R is called as a 'new generation railway mobile communication system based on 5G technology'. In fact, 5G-R is, in short, the 5G technology used in the railway transportation industry. The 5G-R is based on the 5G technology, has the characteristics of ultra-large bandwidth, ultra-low time delay and mass connection, and has more excellent network performance compared with the GSM-R.

Time division duplexing (TDD, time Division Duplexing) is used in a mobile communication system to separate the receive and transmit channels (or uplink and downlink) as a duplexing scheme for the communication system. In a mobile communication system in TDD mode, reception and transmission are performed in different time slots of the same frequency channel, i.e., carrier, and the reception and transmission channels are separated by a guaranteed time. The TDD scheme can dynamically allocate the capacity of the uplink and the downlink, so as to realize the flexibility of resource allocation; finally, since the uplink and downlink use the same frequency, the uplink and downlink consistency is better. In controlling the transmit power of the mobile station, open loop power control may be used instead of the more complex closed loop power control. However, the current technology does not combine the TDD technology with the 5G-R technology well.

Based on the actual needs in the above-mentioned scene, the application provides a 5G-R railway communication system based on TDD to solve the problems existing in the related technology.

Disclosure of Invention

The application provides a 5G-R railway communication system based on TDD, which aims to solve the problem that the TDD technology and the 5G-R technology cannot be well combined when the 5G-R technology is researched in order to avoid the defects of the GSM-R communication technology in the prior art.

The first aspect of the present application provides a TDD-based 5G-R railway communication system, the system comprising: the device comprises a control module, a first signal calibration module, a plurality of receiving diversity channels and a plurality of TDD signal receiving and transmitting channels; the receiving signal input end of the control module is coupled with the signal output end of any receiving diversity channel; the receiving and transmitting signal input end of the control module is coupled with the receiving and transmitting signal output end of any one TDD signal receiving and transmitting path; the receiving and transmitting signal output end of the control module is coupled with the receiving and transmitting signal input end of any one TDD signal receiving and transmitting path; one end of the first signal calibration module is used for collecting antenna signals of a plurality of TDD signal receiving and transmitting paths, and the other end of the first signal calibration module is coupled with the control module.

By adopting the system, the control module, the first signal calibration module, the plurality of receiving diversity channels and the plurality of TDD signal receiving and transmitting channels form the 5G-R railway communication system, so that the plurality of TDD signal receiving and transmitting channels can adjust antenna signals through the first signal calibration module and the plurality of receiving diversity channels, and further, the TDD technology and the 5G-R technology are combined, and the application of time division duplex in the 5G-R technology can be better realized in the research and application process of a new generation of railway mobile communication system.

Optionally, any one of the TDD signal transceiving paths includes: a transmit-receive antenna, a filter, a loop coupler, a receive sub-path, and a transmit sub-path; the receiving and transmitting antenna is coupled with one end of the filter; the other end of the filter is coupled with the coupling end of the annular coupler; the output end of the annular coupler is coupled with one end of the transmitting sub-path, and the input end of the annular coupler is coupled with one end of the receiving sub-path; the other end of the transmission sub-path is coupled with the receiving and transmitting signal output end of the control module, and the other end of the transmission sub-path is a receiving and transmitting signal input end of the TDD signal receiving and transmitting path; the other end of the receiving sub-path is coupled with the receiving and transmitting signal input end of the control module, and the other end of the receiving sub-path is the receiving and transmitting signal output end of the TDD signal receiving and transmitting path.

By adopting the system, a TDD signal receiving and transmitting path is obtained, an out-of-band signal of a TDD frequency band is filtered by a filter, uplink and downlink shared frequency spectrums are processed, and the receiving and transmitting signals are split in a time-sharing working mode, so that the risk of damage of a high-power signal transmitted by a receiving sub-path is avoided.

Optionally, the transmit sub-path includes a Doherty power amplifier; the input end of the Doherty power amplifier is coupled with the receiving and transmitting signal output end of the control module, and the output end is coupled with the output end of the annular coupler.

Optionally, the control module includes a DPD algorithm sub-module, and a first directional coupler is coupled to any one of the transmission sub-paths; the input end of the first directional coupler is coupled with the output end of the Doherty power amplifier, the output end of the first directional coupler is coupled with the output end of the annular coupler, the coupling end of the first directional coupler is coupled with the input end of the DPD algorithm submodule, and the isolation end of the first directional coupler is coupled with the first load.

By adopting the system, the linearity of the transmission sub-path is improved, and the transmitting power of the antenna end and the coverage range of the system are further improved on the basis of the same energy efficiency, so that the networking cost is reduced.

Optionally, the receiving sub-path includes a second switch, a low noise amplifier, and a second load; the first end of the alternative switch is coupled with the input end of the annular coupler, the second end of the alternative switch is coupled with the input end of the low noise amplifier, and the third end of the alternative switch is coupled with the second load.

By adopting the system, the alternative switch is driven to a high-power load in the transmitting time slot. Preventing the receive path from being damaged by high power signals. In the receiving time slot, the switch of the alternative switch is conducted to the receiving sub-path, so that the normal operation of the TDD signal is ensured.

Optionally, the first signal calibration module includes a multi-stage combiner and a plurality of second directional couplers; the second directional couplers are in one-to-one correspondence with the TDD signal transceiving paths and are used for collecting transceiving signals on the corresponding TDD signal transceiving paths; one end of the multistage combiner is respectively coupled with the plurality of second directional couplers, and the other end of the multistage combiner is coupled with the control module.

By adopting the system, the gain difference and the phase difference between each transmitting sub-path are recorded through calibration, and the gain difference and the phase difference between each receiving path are recorded through a control module. Through the recorded data, the gain and the phase of each path of transmission and reception are flexibly controlled, and the desired directivity coverage and data transmission application are realized.

Optionally, the control module further comprises a standing-wave ratio detection sub-module, and the system further comprises a plurality of third couplers, wherein the third couplers are in one-to-one correspondence with the TDD signal receiving and transmitting paths; one side of any one third coupler is coupled with a receiving and transmitting antenna in a corresponding TDD signal receiving and transmitting passage, the other side of the third coupler is coupled with one end of a standing-wave ratio detection sub-module, and the third coupler is used for collecting the voltage standing-wave ratio of the corresponding receiving and transmitting antenna.

By adopting the system, the connection condition of the antenna end is detected and transmitted back to the control module, so that the reliable operation of the communication system is ensured;

Optionally, the control module further comprises a receive diversity algorithm sub-module; one end of the receive diversity algorithm sub-module is coupled to a plurality of receive diversity paths for improving the signal-to-noise ratio of the received signal in the plurality of receive diversity paths.

Optionally, the control module further comprises a calibration algorithm sub-module; one end of the calibration algorithm sub-module is coupled with the first signal calibration module and is used for keeping the gain parameters and the phase parameters of the receiving and transmitting signals in the plurality of FDD signal receiving and transmitting paths consistent.

Optionally, the first signal calibration module, the plurality of receiving diversity paths, and the plurality of TDD signal transceiving paths are respectively coupled to the control module through a signal optimization circuit; the signal optimizing circuit comprises one or more of a blocking capacitor, a matching circuit, an attenuation circuit, an amplifying circuit, a filter and a balun circuit

Compared with the related art, the application has the beneficial effects that:

1. By adopting the system, the control module, the first signal calibration module, the plurality of receiving diversity channels and the plurality of TDD signal receiving and transmitting channels form the 5G-R railway communication system, so that the plurality of TDD signal receiving and transmitting channels can adjust antenna signals through the first signal calibration module and the plurality of receiving diversity channels, and further, the TDD technology and the 5G-R technology are combined, and the application of time division duplex in the 5G-R technology can be better realized in the research and application process of a new generation of railway mobile communication system.

2. By adopting the system, a TDD signal receiving and transmitting path is obtained, an out-of-band signal of a TDD frequency band is filtered by a filter, uplink and downlink shared frequency spectrums are processed, and the receiving and transmitting signals are split in a time-sharing working mode, so that the risk of damage of a high-power signal transmitted by a receiving sub-path is avoided.

3. By adopting the system, the linearity of the transmission sub-path is improved, and the transmitting power of the antenna end and the coverage range of the system are further improved on the basis of the same energy efficiency, so that the networking cost is reduced.

4. By adopting the system, the gain difference and the phase difference between each transmitting sub-path are recorded through calibration, and the gain difference and the phase difference between each receiving path are recorded through a control module. Through the recorded data, the gain and the phase of each path of transmission and reception are flexibly controlled, and the desired directivity coverage and data transmission application are realized.

Drawings

Fig. 1 is a schematic structural diagram of a TDD-based 5G-R railway communication system according to an embodiment of the present application;

fig. 2 is a schematic diagram of a Doherty power amplifier according to an embodiment of the present application;

Fig. 3 is a schematic diagram of a digital predistortion technique according to an embodiment of the present application.

Reference numerals: 10. a control module; 101. a main control module; 102. a DPD algorithm sub-module; 103. a standing-wave ratio detection sub-module; 104. a receive diversity algorithm sub-module; 105. a calibration algorithm sub-module; 20. A first signal calibration module; 30. a receive diversity path; 40. a TDD signal receiving and transmitting path; 401. a filter; 402. a ring coupler; 403. a receive sub-path; 4031. a second switch; 4032. a low noise amplifier; 404. a transmit sub-path; n1, a first directional coupler; n2, a second directional coupler; and N3, a third coupler.

Detailed Description

In order to make the technical solutions in the present specification better understood by those skilled in the art, the technical solutions in the embodiments of the present specification will be clearly and completely described below with reference to the drawings in the embodiments of the present specification, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments.

In describing embodiments of the present application, words such as "exemplary," "such as" or "for example" are used to mean serving as examples, illustrations or explanations. Any embodiment or design described herein as "illustrative," "such as" or "for example" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "illustratively," "such as" or "for example," etc., is intended to present related concepts in a concrete fashion.

In describing embodiments of the present application, the term "plurality" means two or more unless otherwise indicated. For example, a plurality of systems means two or more systems, and a plurality of screen terminals means two or more screen terminals. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating an indicated technical feature. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.

The currently widely used high-speed railway communication technology GSM-R in the world is mainly applied to train control and command transmission interaction scenes due to narrow bandwidth, such as 4MHz in the uplink and downlink of GSM-R in China, and cannot develop high-speed, high-capacity, real-time and reliable service application based on the broadband.

With the advance and testing of 5G-R and FRMCS, it is possible to develop broadband applications based on 5G-R technology in railway systems in the future.

The embodiment of the application provides a structure schematic diagram of a 5G-R railway communication system based on TDD, which comprises the following steps: a control module 10, a first signal calibration module 20, a plurality of receive diversity paths 30, and a plurality of TDD signal transmit receive paths 40.

Specifically, as shown in fig. 1, the received signal input of the control module 10 is coupled to the signal output of any one of the receive diversity paths 30; the transceiver signal input end of the control module 10 is coupled with the transceiver signal output end of any one of the TDD signal transceiver paths 40; the transceiver signal output end of the control module 10 is coupled with the transceiver signal input end of any one of the TDD signal transceiver paths 40; one end of the first signal calibration module 20 is used for collecting antenna signals of the plurality of TDD signal transceiving paths 40, and the other end is coupled with the control module 10.

In the embodiment of the present application, the control module 10 includes a main control module 101, which is configured to process a received signal and output the processed signal to the outside.

In one possible implementation, as shown in fig. 1, any one of the TDD signaling paths 40 includes: a transmit-receive antenna, a filter 401, a loop coupler 402, a receive sub-path 403, and a transmit sub-path 404.

Specifically, as shown in fig. 1, the transceiver antenna is coupled to one end of a filter 401; the other end of the filter 401 is coupled with the coupling end of the annular coupler 402; the output of the ring coupler 402 is coupled to one end of the transmit sub-path 404 and the input is coupled to one end of the receive sub-path 403; the other end of the transmission sub-path 404 is coupled with the transceiver signal output end of the control module 10, and the other end of the transmission sub-path 404 is the transceiver signal input end of the TDD signal transceiver path 40; the other end of the receiving sub-path 403 is coupled to the transmit-receive signal input end of the control module 10, and the other end of the receiving sub-path 403 is the transmit-receive signal output end of the TDD signal transmit-receive path 40.

In the embodiment of the present application, the filter 401 is used to filter out the out-of-band signal in the TDD band. The loop coupler 402 is such that the transmit pin and the antenna pin of the loop coupler 402 are conductive when a signal is transmitted; when receiving signals, the antenna pin and the receiving pin of the annular coupler 402 are conductive; meanwhile, the transmitting pin and the receiving pin of the circulator have large isolation, and signals can be well isolated.

In one possible implementation, as shown in FIG. 1, transmit sub-path 404 includes a Doherty power amplifier; the input end of the Doherty power amplifier is coupled to the transceiver signal output end of the control module 10, and the output end is coupled to the output end of the ring coupler 402.

In the embodiment of the present application, as shown in fig. 2, the wideband modulation signal has a larger PAR (power peak to average ratio) than the narrowband modulation signal because of the modulation technique difference. The Doherty PA has the advantage that the power amplifier maintains a very high operating efficiency over a wide output power range including PAR, ideally approaching 78.5% of class B power amplifiers. Therefore, the linear amplification method is widely applied to linear amplification of broadband high PAR high power advanced modulation signals, and the linear power extension range of the typical application is 6dB. Fig. 2 shows a typical two-way PA combining application, and may also be a multi-way PA combining structure.

As shown in fig. 2, it is assumed that the system characteristic impedance of the radio frequency system is Z0. The radio frequency signal is divided into two paths after entering the power divider from the input port, one path of carrier power amplifier and one path of peak power amplifier, and a matching circuit and a phase adjusting circuit are arranged in front and behind the peak power amplifier. The two paths are combined and output to a load through impedance matching. And adjusting the phase adjusting circuits of the two paths so that the phases of the two paths of signals at the combining position are consistent. The two paths of power supply, bias and matching circuits are adjusted, so that the output power works at a back-off power point under the condition that the carrier power is saturated and the peak power amplifier is not conducted; meanwhile, when both power amplifiers are in saturated conduction, the output power works at the maximum power point. The efficiency of these two output power points is substantially consistent near 78.5%. After the design is finished, when the power is between the maximum output power and the power back-off point, the Doherty power amplifier is still in a very high working efficiency which is slightly lower than 78.5%. A typical Doherty power amplifier output power-efficiency curve can be seen.

In one possible implementation, as shown in fig. 1, the control module 10 includes a DPD algorithm sub-module 102, and a first directional coupler N1 is coupled to any one of the transmission sub-paths 404; the input end of the first directional coupler N1 is coupled with the output end of the Doherty power amplifier, the output end of the first directional coupler N1 is coupled with the output end of the annular coupler 402, the coupling end of the first directional coupler N1 is coupled with the input end of the DPD algorithm submodule 102, and the isolation end of the first directional coupler N1 is coupled with the first load. The digital predistortion (DPD, digital Pre-distorsion) in the embodiments of the present application is a technique to improve the linearity of a power amplifier.

In the embodiment of the present application, DPD algorithm submodule 102 is used in cooperation with a Doherty power amplifier to calibrate the Doherty power amplifier so that the high linearity and high efficiency of the Doherty power amplifier in a wideband can be kept consistent. DPD is also a well-established technique, and similar algorithms are numerous, and a related DPD algorithm model block diagram is shown in fig. 3.

Specifically, the basic principle of the DPD technology is that through training, an AM-AM nonlinear curve and an AM-PM nonlinear curve of the input and output of the power amplifier are obtained first, then the AM-PM nonlinear curve is symmetrical with respect to an AM-AM curve extension line, a new AM-AM and AM-PM are obtained, and the curves are stored in the main control module 101. And when in actual transmission, combining the actual IQ signal data with the inverted IQ signal data for transmission, thereby obtaining the linear correction and expansion of the power amplifier.

In one possible implementation, as shown in fig. 2, the receive sub-path 403 includes a one-out-of-two switch 4031, a low noise amplifier 4032, and a second load; the alternative switch 4031 has a first terminal coupled to the input of the ring coupler 402, a second terminal coupled to the input of the low noise amplifier 4032, and a third terminal coupled to the second load.

In the embodiment of the present application, the use of the alternative switch 4031 is specifically as follows: during the transmit time slot, the one-out-of-two switch 4031 is open to a high power load. Preventing the receive path from being damaged by high power signals. During the receive time slot, the alternative switch 4031 is turned on to the receive sub-path 403.

In one possible implementation, as shown in fig. 1, the first signal calibration module 20 includes a multi-stage combiner and a plurality of second directional couplers N2; the plurality of second directional couplers N2 are in one-to-one correspondence with the plurality of TDD signal transceiving paths 40, and the second directional couplers N2 are used for collecting transceiving signals on the corresponding TDD signal transceiving paths 40; one end of the multistage combiner is coupled with the plurality of second directional couplers N2, and the other end is coupled with the control module 10.

In one possible implementation, the control module 10 further includes a receive diversity algorithm sub-module 104; one end of the receive diversity algorithm sub-module 104 is coupled to the plurality of receive diversity paths 30 for improving the signal-to-noise ratio of the received signals in the plurality of receive diversity paths 30.

In the embodiment of the present application, one end of the receive diversity algorithm sub-module 104 is coupled to the plurality of receive diversity paths 30, and the other end is coupled to the main control module 101. Each receive sub-path 403 has a corresponding one of the receive diversity paths 30, in combination with the receive diversity algorithm sub-module 104, to provide SNR for the received signal and improve the receive coverage of the signal.

In one possible implementation, the control module 10 further includes a calibration algorithm sub-module 105; one end of the calibration algorithm sub-module 105 is coupled to the first signal calibration module 20, so as to keep the gain parameters and phase parameters of the transceiving signals in the plurality of FDD signal transceiving paths 40 consistent.

Specifically, the first signal calibration module 20 includes a multi-stage combiner, and the sampling signal of each signal transceiving path is obtained by the signal sampling method of the first signal calibration module 20 and the plurality of FDD signal transceiving paths 40 as shown in fig. 1.

The objective in the embodiment of the present application is that the transceiving of the multiple FDD signal transceiving paths 40 are completely identical, i.e. the gain and phase of each receiving sub-path 403 are completely identical, and the gain and phase of each transmitting sub-path are also completely identical. In practice, however, it is not possible to make each receiving sub-path 403 completely uniform, nor each transmitting sub-path completely uniform, due to the non-uniformity and tolerances of the device and PCB, and the fact that part of the circuit is forced to be designed with micro-modification. It is therefore necessary to record the gain differences and phase differences between each transmit sub-path and each other by calibration, and the gain differences and phase differences between each receive sub-path 403 by the first signal calibration module 20, to be transmitted to the calibration algorithm sub-module 105, and to adjust the power and phase of the transmission (the transmission advance or delay of the signal) based on the stored transfer function at the time of signal transmission. For subsequent beam plasticity, such that the antenna array transmission and reception has a controllable directivity.

The specific calibration process is as follows: first, gain and phase of the calibration path at full temperature are measured and obtained. The temperature, frequency, which cannot be measured, can be obtained by interpolating the known data. A single tone signal is then transmitted from the right transceiver of the MIMO calibration path and the switches on the path are controlled so that the signal flows through the multistage combiner and the loop coupler 402 on the path back to the receive sub-path 403 of each path and reaches the receive part of the transceiver on that path for digitization to obtain the gain and phase of the entire loop, which is the gain and phase of each receive sub-path 403 alone, and the gain and phase of the entire loop are offset from the gain and phase of the calibration path. Recorded.

Then, a single-tone signal is transmitted from the transceiver transmitting circuit of each channel in turn, the switch on the control channel is controlled to enable the signal to flow through the transmitting channel, the directional coupler and the multi-stage combiner, finally the signal enters the main control module 101 through the calibration channel, the receiving circuit of the transceiver is used for digital processing to obtain the gain and the phase of the whole large loop, and the difference between the gain and the phase and the gain and the phase of the calibration channel is the gain and the phase of each transmitting channel

In a possible implementation manner, as shown in fig. 1, the control module 10 further includes a standing-wave ratio detection sub-module 103, and the system further includes a plurality of third couplers N3, where the plurality of third couplers N3 are in one-to-one correspondence with the plurality of TDD signal transceiving paths 40; one side of any one third coupler N3 is coupled to the corresponding transceiver antenna in the TDD signal transceiver path 40, and the other side is coupled to one end of the standing-wave ratio detection submodule 103, where the third coupler N3 is used to collect the voltage standing-wave ratio of the corresponding transceiver antenna.

Each transceiver path in the invention comprises a DVSWR path for antenna standing wave ratio detection.

The DVSWR algorithm is as follows: the power of the two coupling modes of the P forward direction and the P reverse direction is read from a transceiver in the control module (10), and the standing wave ratio VSWR of the antenna is calculated as follows.

Vswr= [1+ (10 ((P-reverse-P-forward)/20)) ]/[ 1- (10 ((P-reverse-P-forward)/20)) ]

In one possible implementation, the first signal calibration module 20, the plurality of receive diversity paths 30, and the plurality of TDD signal transceiving paths 40 are each coupled to the control module 10 through signal optimization circuitry; the signal optimization circuit includes one or more of a blocking capacitor, a matching circuit, an attenuation circuit, an amplification circuit, a filter 401, and a balun circuit.

In the embodiment of the present application, as shown in fig. 1, any one of the modules or paths is provided with a detailed signal optimizing circuit combination for improving signal quality before being connected into the control module 10.

By adopting the embodiment, the beneficial effects of the application can be achieved by one or more of the following:

It should be noted that: in the device provided in the above embodiment, when implementing the functions thereof, only the division of the above functional modules is used as an example, in practical application, the above functional allocation may be implemented by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules, so as to implement all or part of the functions described above. In addition, the embodiments of the apparatus and the method provided in the foregoing embodiments belong to the same concept, and specific implementation processes of the embodiments of the method are detailed in the method embodiments, which are not repeated herein.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.

In the several embodiments provided by the present application, it should be understood that the disclosed apparatus may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, such as the division of the units, merely a logical function division, and there may be additional manners of dividing the actual implementation, such as multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some service interface, device or unit indirect coupling or communication connection, electrical or otherwise.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable memory. Based on this understanding, the technical solution of the present application may be embodied essentially or partly in the form of a software product, or all or part of the technical solution, which is stored in a memory, and includes several instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned memory includes: various media capable of storing program codes, such as a U disk, a mobile hard disk, a magnetic disk or an optical disk.

The foregoing is merely exemplary embodiments of the present disclosure and is not intended to limit the scope of the present disclosure. That is, equivalent changes and modifications are contemplated by the teachings of this disclosure, which fall within the scope of the present disclosure. Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains.

Claims

1. A TDD-based 5G-R railway communication system, the system comprising: a control module (10), a first signal calibration module (20), a plurality of receive diversity paths (30), and a plurality of TDD signal transmit receive paths (40);

The receiving signal input end of the control module (10) is coupled with the signal output end of any one of the receiving diversity paths (30); the receiving and transmitting signal input end of the control module (10) is coupled with the receiving and transmitting signal output end of any one of the TDD signal receiving and transmitting paths (40); the receiving and transmitting signal output end of the control module (10) is coupled with the receiving and transmitting signal input end of any one of the TDD signal receiving and transmitting paths (40);

one end of the first signal calibration module (20) is used for collecting antenna signals of a plurality of the TDD signal transceiving paths (40), and the other end of the first signal calibration module is coupled with the control module (10).

2. The system according to claim 1, wherein any one of the TDD signaling paths (40) comprises: a transmitting/receiving antenna, a filter (401), a loop coupler (402), a receiving sub-path (403), and a transmitting sub-path (404);

the transceiver antenna is coupled with one end of the filter (401);

the other end of the filter (401) is coupled with the coupling end of the annular coupler (402);

An output end of the annular coupler (402) is coupled with one end of the transmitting sub-path (404), and an input end of the annular coupler is coupled with one end of the receiving sub-path (403);

The other end of the transmission sub-path (404) is coupled with a receiving and transmitting signal output end of the control module (10), and the other end of the transmission sub-path (404) is a receiving and transmitting signal input end of the TDD signal receiving and transmitting path (40);

The other end of the receiving sub-path (403) is coupled with the receiving and transmitting signal input end of the control module (10), and the other end of the receiving sub-path (403) is the receiving and transmitting signal output end of the TDD signal receiving and transmitting path (40).

3. The system of claim 2, wherein the transmit sub-path (404) comprises a Doherty power amplifier;

the input end of the Doherty power amplifier is coupled with the receiving and transmitting signal output end of the control module (10), and the output end of the Doherty power amplifier is coupled with the output end of the annular coupler (402).

4. A system according to claim 3, characterized in that the control module (10) comprises a DPD algorithm sub-module (102), a first directional coupler being coupled in any one of the transmit sub-paths (404);

the input end of the first directional coupler is coupled with the output end of the Doherty power amplifier, the output end of the first directional coupler is coupled with the output end of the annular coupler (402), the coupling end of the first directional coupler is coupled with the input end of the DPD algorithm submodule (102), and the isolation end of the first directional coupler is coupled with a first load.

5. The system of claim 2, wherein the receive sub-path (403) comprises a one-out-of-two switch (4031), a low noise amplifier (4032), and a second load;

The alternative switch (4031) has a first end coupled to the input of the ring coupler (402), a second end coupled to the input of the low noise amplifier (4032), and a third end coupled to the second load.

6. The system according to claim 1, characterized in that the first signal calibration module (20) comprises a multistage combiner and a plurality of second directional couplers (N2);

The second directional couplers (N2) are in one-to-one correspondence with the TDD signal transceiving paths (40), and the second directional couplers (N2) are used for collecting transceiving signals on the corresponding TDD signal transceiving paths (40);

One end of the multistage combiner is respectively coupled with a plurality of the second directional couplers (N2), and the other end of the multistage combiner is coupled with the control module (10).

7. The system according to claim 2, wherein the control module (10) further comprises a standing wave ratio detection sub-module (103), the system further comprising a plurality of third couplers (N3), the plurality of third couplers (N3) being in one-to-one correspondence with the plurality of TDD signal transceiving paths (40);

One side of any one of the third couplers (N3) is coupled with a corresponding receiving and transmitting antenna in the TDD signal receiving and transmitting path (40), the other side of the third coupler is coupled with one end of the standing-wave ratio detection sub-module (103), and the third coupler (N3) is used for collecting the voltage standing-wave ratio of the corresponding receiving and transmitting antenna.

8. The system of claim 1, wherein the control module (10) further comprises a receive diversity algorithm sub-module (104);

One end of the receive diversity algorithm sub-module (104) is coupled to the plurality of receive diversity paths (30) for improving the signal-to-noise ratio of the received signal in the plurality of receive diversity paths (30).

9. The system of claim 1, wherein the control module (10) further comprises a calibration algorithm sub-module (105);

One end of the calibration algorithm sub-module (105) is coupled to the first signal calibration module (20) and is configured to keep the gain parameters and the phase parameters of the transceiving signals in the plurality of FDD signal transceiving paths (40) consistent.

10. The system of claim 1, wherein the first signal calibration module (20), the plurality of receive diversity paths (30), and the plurality of TDD signal transceiving paths (40) are each coupled to the control module (10) by signal optimization circuitry;

the signal optimization circuit comprises one or more of a blocking capacitor, a matching circuit, an attenuation circuit, an amplifying circuit, a filter (401) and a balun circuit.