CN221948173U - A communication system suitable for subway tunnels - Google Patents
A communication system suitable for subway tunnels Download PDFInfo
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- CN221948173U CN221948173U CN202420526072.9U CN202420526072U CN221948173U CN 221948173 U CN221948173 U CN 221948173U CN 202420526072 U CN202420526072 U CN 202420526072U CN 221948173 U CN221948173 U CN 221948173U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model discloses a communication system suitable for subway tunnels, and relates to the technical field of communication. The system comprises a branching unit, a radio frequency signal router and an antenna unit, wherein the branching unit is used for branching each radio frequency signal in at least two radio frequency signals with different frequency bands into at least two paths; the radio frequency signal router is connected with the branching unit, and is used for combining at least two paths of signals after each path of radio frequency signal branching one by one to form at least two paths of second combined signals, and branching each path of second combined signals into at least two paths; the antenna unit is connected with the radio frequency signal router and comprises a plurality of antennas, and the antenna unit is used for transmitting at least two paths of signals after each path of second combined signal is split into two paths of signals in a one-to-one correspondence mode to the outside through different antennas; thus, the requirement of multi-band signals can be met, and the coverage of the signals is increased.
Description
Technical Field
The utility model relates to the technical field of communication, in particular to a communication system suitable for subway tunnels.
Background
In recent years, with the scale construction of 5G outdoor base stations, coverage of 5G signals is basically realized in most areas of the whole country, and great convenience is brought to daily life. As a special scene, the coverage of 5G signals is far from meeting the needs of people, and although most stations already achieve 5G signal coverage, 5G signals are not available in a large subway tunnel area. In addition, due to the characteristics of high requirements on subway scene safety, short construction time, narrow space and the like, the implementation of 5G signal coverage of subway tunnels is more difficult, and in recent years, operators are actively searching for 5G signal coverage schemes of various subway tunnels.
At present, a 5G signal coverage scheme of a subway tunnel is adopted, and a BBU+RRU coverage mode is adopted, and because the current RRU can only support single-band 5G signals, in order to meet the coverage of 5G signals of multiple operators, a plurality of RRUs are required to be installed in the subway tunnel, and the plurality of RRUs are output to a leaky cable for coverage after being combined by a POI. The scheme has two defects, firstly, a plurality of RRUs are installed, the requirement of subway high safety is not met, and the occupied tunnel space is large. In addition, the leaky cable is adopted for covering, most existing leaky cables of the subway tunnel at present do not support 3500MHz frequency bands, so that in order to meet 5G signal introduction of telecom and UNICOM operators, the leaky cable has to be newly laid, the engineering construction amount is large, the requirement of daily operation of the subway is limited, the laying cannot be completed in a short time, and the 5G signal covering progress of the subway tunnel is seriously affected.
Disclosure of utility model
Aiming at the defects existing in the prior art, the utility model aims to provide a communication system suitable for a subway tunnel, which is at least used for solving one technical problem.
According to one aspect of the present utility model, there is provided a communication system adapted for use in a subway tunnel for signal downlink, comprising:
The branching unit is used for branching each radio frequency signal in at least two radio frequency signals with different frequency bands into at least two paths;
The radio frequency signal router is connected with the branching unit and is used for combining at least two paths of signals after branching each path of radio frequency signal one by one to form at least two paths of second combined signals, and branching each path of second combined signals into at least two paths;
The antenna unit is connected with the radio frequency signal router and comprises a plurality of antennas, and the antenna unit is used for enabling at least two paths of signals after each path of second combined signal is split to correspond one by one and then send the signals to the outside through different antennas.
According to the communication system suitable for the subway tunnel, the radio frequency signals in different frequency bands are split through the splitting unit, meanwhile, the split different signals are combined in one-to-one correspondence through the radio frequency signal router to form different second combined signals, and each path of second combined signals is split into at least two paths, so that the radio frequency signals in different frequency bands can be combined into multiple paths of combined signals for a plurality of antennas to transmit to the outside, the requirement of the signals in multiple frequency bands can be met, and the coverage of the signals is increased.
In some embodiments, the radio frequency signal router comprises:
Each bridge is connected with the branching unit, and each bridge is used for combining one path of signals after branching each path of radio frequency signal one by one to form a second combined path of signals, and branching the second combined path of signals into at least two paths;
At least two power dividers, each of which is connected with one of the bridges, each power divider is used for dividing one path of the second combined signal into at least two paths.
In some embodiments, the branching unit includes:
the information source unit is used for forming at least two paths of radio frequency signals with different frequency bands;
The signal access unit is connected with the information source unit and is used for combining at least two paths of radio frequency signals with different frequency bands into a first combined signal;
And each signal remote unit is connected with the signal access unit, and is used for converting the first combined signal into at least two paths of radio frequency signals with different frequency bands and branching each path of radio frequency signals in the at least two paths of radio frequency signals with different frequency bands into at least two paths.
In some embodiments, the source unit includes at least two RRUs/pRRU.
In some embodiments, the signal access unit comprises:
Each first radio frequency signal processing module is connected with the information source unit and is used for filtering and analog-to-digital converting each path of radio frequency signals to obtain first digital signals;
The first digital signal processing module is connected with at least two first radio frequency signal processing modules, and the first digital signal processing module is used for combining at least two paths of first digital signals into a first combined signal.
In some embodiments, the signal pulling unit comprises:
The second digital signal processing module is connected with the signal access unit and is used for decomposing the first combined signal into at least two paths of digital baseband signals with different frequency bands;
Each second radio frequency signal processing module is connected with the second digital signal processing module, and each second radio frequency signal processing module is used for converting each path of digital baseband signal into at least two paths of radio frequency signals with amplified power;
The filter is connected with at least two second radio frequency signal processing modules and is used for carrying out filtering processing on the radio frequency signals with amplified power.
In some embodiments, the signal access unit further includes a first photoelectric conversion module, where the first photoelectric conversion module is connected to the first digital signal processor, and the first photoelectric conversion module is configured to convert the first combined signal into an optical signal.
In some embodiments, the signal remote unit further includes a second photoelectric conversion module, where the second photoelectric conversion module is connected to the first photoelectric conversion module and the second digital signal processing module, and the second photoelectric conversion module is configured to convert the optical signal into the first combined signal.
In some embodiments, the signal remote unit further includes a power module, where the power module is respectively connected to the second photoelectric conversion module, the second digital signal processing module, and at least two of the second radio frequency signal processing modules, and the power module is configured to supply power to the second photoelectric conversion module, the second digital signal processing module, and at least two of the second radio frequency signal processing modules.
In some embodiments, the antenna unit is further configured to receive the inverted signal and transmit the inverted signal back to the branching unit through an inverse process of signal downlink.
Compared with the prior art, the communication system suitable for the subway tunnel, disclosed by the utility model, has the advantages that radio frequency signals in different frequency bands are split through the splitting unit, meanwhile, different split signals are combined in a one-to-one correspondence manner through the radio frequency signal router to form different second combined signals, and each path of the second combined signals is split into at least two paths, so that the radio frequency signals in different frequency bands can be combined into multiple paths of combined signals for a plurality of antennas to transmit to the outside, and the requirement of the signals in multiple frequency bands can be met, and the coverage of the signals is increased.
Drawings
Fig. 1 is a schematic structural diagram of a branching unit of a communication system adapted to a subway tunnel according to an embodiment of the present utility model;
Fig. 2 is a schematic structural diagram of a radio frequency signal router and an antenna unit of a communication system suitable for a subway tunnel according to an embodiment of the present utility model;
Fig. 3 is a flowchart of a communication method suitable for a subway tunnel according to an embodiment of the present utility model.
Detailed Description
The utility model is described in further detail below with reference to the accompanying drawings.
The embodiment of the utility model provides a communication system suitable for a subway tunnel, which is a 5G communication system suitable for the subway tunnel, overcomes the defects of the existing product system in the existing subway tunnel coverage scene, can meet the requirements of 2.6G frequency band 5G signals and 3.5G frequency band 5G signals on the subway tunnel coverage in 5G communication, is used for signal downlink, and comprises a branching unit 100, a radio frequency signal router 40 and an antenna unit 50 as shown in fig. 1 and 2.
As shown in fig. 1, the branching unit 100 is configured to branch each of at least two radio frequency signals with different frequency bands into at least two paths; specifically, the branching unit 100 includes a source unit 10, a signal access unit 20, and at least one signal remote unit 30, where the source unit 10 is configured to form at least two radio frequency signals with different frequency bands, where the source unit 10 includes at least two RRUs/pRRU 11, for example, where a first RRU/pRRU may be a 2.6G band 5G RRU/pRRU, a 2.6G band 5G RRU/pRRU generates a 2.6G band 5G signal (i.e., a radio frequency signal), a second RRU/pRRU may be a 3.5G band 5G RRU/pRRU, the 3.5G frequency band 5G RRU/pRRU generates a 3.5G frequency band 5G signal (namely radio frequency signal), and of course, other frequency band RRUs/pRRU can be added on the basis of the 3.5G frequency band 5G RRU/pRRU, and the 2.6G frequency band 5G RRU/pRRU and the 3.5G frequency band 5G RRU/pRRU respectively correspond to a high-power base station (RRU) or a low-power base station (pRRU) which are moved in China, a high-power base station (RRU) or a low-power base station (pRRU) which are communicated in China, and the RRUs/pRRU are 2T2R equipment or two paths in 4T4R equipment.
The signal access unit 20 is connected with the signal source unit 10, and the signal access unit 20 is used for combining at least two paths of radio frequency signals with different frequency bands into a first combined signal; the signal access unit 20 can simultaneously access 5G signals of two frequency bands of 2.6G and 3.5G, and each frequency band supports 2T2R, and the signal access unit 20 is installed in a subway platform machine room; specifically, the signal access unit 20 includes at least two first rf signal processing modules 21 and first digital signal processing modules 22, where each first rf signal processing module 21 is connected to the signal source unit 10 through a rf cable, that is, each first rf signal processing module 21 is respectively connected to each RRU/pRRU11 in the signal source unit 10 in a one-to-one correspondence manner, and each first rf signal processing module 21 is configured to perform filtering and analog-to-digital conversion processing on each path of rf signal to obtain a first digital signal; the first digital signal processing module 22 is connected to at least two first radio frequency signal processing modules 21, where the first digital signal processing module 22 is configured to combine at least two paths of first digital signals into a first combined signal, that is, the first digital signal processing module 22 extracts digital baseband signals of at least two frequency bands from the at least two paths of first digital signals, performs data combination processing based on a CPRI protocol, and then performs compression and packing to obtain a first combined signal. Illustratively, the first rf signal processing module 21 may be implemented using an integrated rf transceiver device, and the first digital signal processing module 22 may be implemented using an FPGA device. Preferably, the radio frequency transceiver device adopts ADRV9026, ADRV9009, ADRV9025 and the like of ADI or AFE7921 of TI and the like, and the FPGA device adopts XCZU CG or XC7Z100 or XC7K420T of Xilinx and the like.
Further, the signal access unit 20 further includes a first photoelectric conversion module 23, where the first photoelectric conversion module 23 is connected to the first digital signal processor 22, and the first photoelectric conversion module 23 is configured to convert the first combined signal into an optical signal, that is, the first photoelectric conversion module 23 performs electro-optical conversion on the first combined signal obtained by the first digital signal processor 22 into the optical signal. It should be noted that, the first photoelectric conversion module 23 may have a plurality of optical fibers, so as to transmit the digital baseband signals that are similarly combined to the plurality of signal remote units 30, where the optical fiber data rate is 10Gbps, and the digital baseband signals can be transmitted to the 4 signal remote units 30 at maximum.
Each signal remote unit 30 is connected to the signal access unit 20, where the signal remote unit 30 is configured to convert the first combined signal into at least two radio frequency signals with different frequency bands, and split each radio frequency signal in the at least two radio frequency signals with different frequency bands into at least two radio frequency signals; the signal remote unit 30 can simultaneously remote 5G signals of two frequency bands of 2.6G and 3.5G, and each frequency band supports 2T2R, and the signal remote unit 30 is installed in a subway tunnel; specifically, the signal remote unit 30 includes a second photoelectric conversion module 31, a second digital signal processing module 32, at least two second radio frequency signal processing modules 33, and a filter 34; the second photoelectric conversion module 31 is connected to the first photoelectric conversion module 23, the second photoelectric conversion module 31 is configured to convert an optical signal into a first combined signal, that is, the second photoelectric conversion module 31 is configured to convert the optical signal converted by the first photoelectric conversion module 23 into a digital signal (that is, a first combined signal), the second digital signal processing module 32 is connected to the signal access unit 20, the second digital signal processing module 32 is configured to decompose the first combined signal into at least two paths of digital baseband signals with different frequency bands, that is, the second digital signal processing module 32 is connected to the first photoelectric conversion module 23 of the signal access unit 20 through the second photoelectric conversion module 31, and after the second digital signal processing module 32 is resolved based on the CPRI protocol, at least two paths of digital baseband signals with different frequency bands (for example, digital baseband signals with frequency bands of 2.6G and 3.5G) are decomposed according to the previous combined data mode; each second radio frequency signal processing module 33 is connected with the second digital signal processing module 32, and each second radio frequency signal processing module 33 is used for converting each digital baseband signal into at least two power amplified radio frequency signals; the filter 34 is connected to at least two second rf signal processing modules 33, and the filter 34 is configured to filter the power-amplified rf signal to remove out-of-band spurious components, thereby forming a multi-path clean power-amplified rf signal. Illustratively, the second digital signal processing module 32 may be implemented by an FPGA, the second radio frequency signal processing module 33 may be implemented by a radio frequency transceiver device with high efficiency (e.g., a radio frequency transceiver device plus a 2.6G high efficiency power amplifier, a radio frequency transceiver device plus a 3.5G high efficiency power amplifier), and the filter 34 may be implemented by a cavity filter. Preferably, the FPGA device adopts XCZU CG or XC7Z100 or XC7K420T of Xilinx, the radio frequency transceiver device adopts ADRV9026, ADRV9009, ADRV9025, or AFE7921 of TI, and the 2.6G and 3.5G high-efficiency power amplifier adopts a module integrating DPD and Doherty technologies.
Further, the signal remote unit 30 further includes a power module 35, where the power module 35 is respectively connected to the second photoelectric conversion module 31, the second digital signal processing module 32, and the at least two second radio frequency signal processing modules 33, and the power module 35 is configured to supply power to the second photoelectric conversion module 31, the second digital signal processing module 32, and the at least two second radio frequency signal processing modules 33.
As shown in fig. 2, the radio frequency signal router 40 is connected to the branching unit 100, and the radio frequency signal router 40 is configured to combine at least two paths of signals after branching each path of radio frequency signal to form at least two paths of second combined signals in a one-to-one correspondence manner, and branch each path of second combined signals into at least two paths; the interface of the radio frequency signal router 40 is multiple-in and multiple-out, and supports two frequency bands of 2.6G and 3.5G, the input of 2T2R radio frequency signals of each frequency band is output as a signal of at least two frequency band combining way, and the radio frequency signal router 40 is arranged in a subway tunnel; specifically, the radio frequency signal router 40 includes at least two bridges 41 and at least two power splitters 42; each bridge 41 is connected with the filter 34 in the branching unit 100, and is configured to combine one of the signals after branching the radio frequency signals to form a second combined signal, and branch the second combined signal into at least two paths, that is, each frequency band of the multipath pure power amplified radio frequency signals output by the filter 34 includes at least two paths, and the filter 34 connects one of the signals in each frequency band to each bridge 41 through a radio frequency cable, so that each bridge 41 can receive one of the signals in each frequency band, and branch the signals into at least two paths of second combined signals after combining the signals; each power divider 42 is connected to one bridge 41, and each power divider 42 is configured to divide one of the second combined signals into at least two paths, that is, each power divider 42 divides one of the second combined signals output by each bridge 41 into two paths. Illustratively, bridge 41 is implemented with a low intermodulation cavity and power divider 42 is implemented with a cavity two power divider.
The antenna unit 50 is connected with the radio frequency signal router 40, the antenna unit 50 comprises a plurality of antennas 51, and the antenna unit 50 is used for transmitting at least two paths of signals after each path of second combined signal is split to the outside through different antennas 51 after corresponding one by one; the antenna unit 50 can receive and transmit 5G signals of two frequency bands of 2.6G and 3.5G simultaneously, and each frequency band supports 2T2R, and the antenna unit 50 is installed in a subway tunnel; specifically, the radio frequency signal router 40 accesses one signal of each frequency band to each antenna 51 through a radio frequency cable, so that each antenna 51 can receive one signal of each frequency band and radiate the one signal to a subway tunnel area to be covered. The antenna 51 is illustratively a dual band, high power 2T2R wall-mounted antenna.
For easy understanding, the present embodiment is illustrated by using two frequency bands (2.6G and 3.5G) of rf signals, where the 2.6G frequency band rf signal and the 3.5G frequency band rf signal are respectively processed by the branching unit 100 and are respectively branched into two power amplified 2.6G frequency band rf signals and two power amplified 3.5G frequency band rf signals in different second digital signal processing modules 32 in the branching unit 100, and are divided into four access rf signal routers 40 by rf cables, one of which is a 2.6G channel 1 signal, one of which is a 2.6G channel 2 signal, one of which is a 3.5G channel 1 signal, One path is a 3.5G channel 2 signal, the four channels of signals are mutually independent, the isolation degree of the signals of the 2.6G channel 1 and the channel 2 is more than 50dB, the isolation degree of the signals of the 3.5G channel 1 and the 3.5G channel 2 is more than 50dB, namely the isolation degree between the signals of the same frequency band is more than 50dB; The radio frequency signal router 40 changes the input four-channel 5G signal into six-channel 5G signal according to the power and phase relation of each channel, ensures that each channel contains a double-frequency-band 5G signal with corresponding power and phase, specifically, the 2.6G channel 1 signal and the 3.5G channel 1 signal which enter the radio frequency signal router 40 enter one of the bridges 41 simultaneously, and the two channels are output after combining, wherein each channel contains 2.6G frequency band and 3.5G frequency band 5G signals; one of the paths is divided into two paths again through one of the power dividers 42, and each path contains 2.6G frequency band and 3.5G frequency band 5G signals; the other path is directly output, three paths of signals are generated in total, each path contains 2.6G frequency band and 3.5G frequency band 5G signals, one path is a 2.6G &3.5G channel 11, the second path is a 2.6G &3.5G channel 12, and the third path is a 2.6G &3.5G channel 13; The signal power of the 2.6G &3.5G channel 11 is the same as the signal power of the 2.6G &3.5 channel 12, and is lower than the signal power of the 2.6G &3.5G channel 13 by about 3 dB; similarly, the 2.6G channel 2 signal and the 3.5G channel 2 signal entering the radio frequency signal router 40 enter the other bridge 41 at the same time, and are output into two paths after being combined, wherein each path contains 2.6G frequency band and 3.5G frequency band 5G signals; one of the paths is divided into two paths again by the other power divider 42, and each path contains 2.6G frequency band and 3.5G frequency band 5G signals; the other path is directly output, three paths of signals are generated in total, each path contains 2.6G frequency band and 3.5G frequency band 5G signals, one path is a 2.6G &3.5G channel 21, the second path is a 2.6G &3.5G channel 22, and the third path is a 2.6G &3.5G channel 23; the signal power of the 2.6G &3.5G channel 21 is the same as the signal power of the 2.6G &3.5 channel 22, and is lower than the signal power of the 2.6G &3.5G channel 23 by about 3 dB; the 2.6G &3.5G channel 11 signal and the 2.6G &3.5G channel 21 signal are output to a first antenna 51 in the antenna unit 50 through radio frequency cables, respectively; the 2.6G &3.5G channel 12 signal and the 2.6G &3.5G channel 22 signal are output to a second antenna 51 in the antenna unit 50 through radio frequency cables, respectively; The 2.6g &3.5g channel 13 signal and the 2.6g &3.5g channel 23 signal are output to a third antenna 51 in the antenna unit 50 via radio frequency cables, respectively. Three antennas 51 in the antenna unit 50 radiate 5G signal spaces of two 2.6G frequency bands and 3.5G frequency bands together to a subway tunnel area to be covered, respectively; the isolation is greater than 25dB for 2.6g &3.5g channel 11 and 2.6g &3.5g channel 21, 2.6g &3.5g channel 12 and 2.6g &3.5g channel 22, 2.6g &3.5g channel 13 and 2.6g &3.5g channel 23.
In an alternative embodiment, the communication system is further used for signal uplink, specifically, the antenna unit 50 is further used for receiving a reverse signal, and transmitting the reverse signal back to the branching unit 100 through a reverse process of signal downlink, that is, the antenna unit 50 obtains a reverse signal from a subway tunnel coverage area, and transmits the reverse signal back to RRU/pRRU (such as 2.6G band 5G RRU/pRRU, 3.5G band 5G RRU/pRRU) in different frequency bands through a reverse process of signal downlink; thereby realizing the complete coverage of the 5G signals of the 2.6G frequency band and the 3.5G frequency band in the subway tunnel.
According to the embodiment, the radio frequency signals of different frequency bands are split through the splitting unit, meanwhile, the split different signals are combined in one-to-one correspondence through the radio frequency signal router to form different second combined signals, and each second combined signal is split into at least two paths, so that the radio frequency signals of different frequency bands can be combined into multiple paths of combined signals for a plurality of antennas to transmit to the outside, the requirement of the signals of multiple frequency bands can be met, and the coverage of the signals is increased.
The embodiment of the utility model provides a communication method suitable for a subway tunnel, which is implemented in the communication system suitable for the subway tunnel and is used for signal downlink, as shown in fig. 3, and the communication method comprises the following steps:
S100: the branching unit 100 branches each of at least two radio frequency signals of different frequency bands into at least two paths;
S200: the radio frequency signal router 40 combines at least two paths of signals after each path of radio frequency signal is split into at least two paths of second combined signals in a one-to-one correspondence manner, and splits each path of second combined signals into at least two paths;
S300: the antenna unit 50 outputs at least two signals, which are split by the second combined signal, to the outside through different antennas after corresponding one by one.
In an alternative embodiment, the antenna unit 50 receives the inverted signal and transmits the inverted signal back to the branching unit 100 through the inverse process of the signal down.
It should be noted that, the specific processing procedures of the branching unit 100, the radio frequency signal router 40 and the antenna unit 50 are described in detail in the communication system suitable for the subway tunnel, so that the detailed description thereof is omitted.
What has been described above is merely some embodiments of the present utility model. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the utility model.
Claims (10)
1. A communication system adapted for use in a subway tunnel for signal downlink, comprising:
The branching unit is used for branching each radio frequency signal in at least two radio frequency signals with different frequency bands into at least two paths;
The radio frequency signal router is connected with the branching unit and is used for combining at least two paths of signals after branching each path of radio frequency signal one by one to form at least two paths of second combined signals, and branching each path of second combined signals into at least two paths;
The antenna unit is connected with the radio frequency signal router and comprises a plurality of antennas, and the antenna unit is used for enabling at least two paths of signals after each path of second combined signal is split to correspond one by one and then send the signals to the outside through different antennas.
2. The communication system adapted for use in a subway tunnel according to claim 1 wherein said radio frequency signal router comprises:
Each bridge is connected with the branching unit, and each bridge is used for combining one path of signals after branching each path of radio frequency signal one by one to form a second combined path of signals, and branching the second combined path of signals into at least two paths;
At least two power dividers, each of which is connected with one of the bridges, each power divider is used for dividing one path of the second combined signal into at least two paths.
3. The communication system adapted for use in a subway tunnel according to claim 1, wherein said branching unit comprises:
the information source unit is used for forming at least two paths of radio frequency signals with different frequency bands;
The signal access unit is connected with the information source unit and is used for combining at least two paths of radio frequency signals with different frequency bands into a first combined signal;
And each signal remote unit is connected with the signal access unit, and is used for converting the first combined signal into at least two paths of radio frequency signals with different frequency bands and branching each path of radio frequency signals in the at least two paths of radio frequency signals with different frequency bands into at least two paths.
4. A communication system adapted for use in a subway tunnel according to claim 3 wherein the source unit comprises at least two RRUs/pRRU.
5. A communication system adapted for use in a subway tunnel according to claim 3 wherein said signal access unit comprises:
Each first radio frequency signal processing module is connected with the information source unit and is used for filtering and analog-to-digital converting each path of radio frequency signals to obtain first digital signals;
The first digital signal processing module is connected with at least two first radio frequency signal processing modules, and the first digital signal processing module is used for combining at least two paths of first digital signals into a first combined signal.
6. The communication system adapted for use in a subway tunnel according to claim 5, wherein said signal pulling unit comprises:
The second digital signal processing module is connected with the signal access unit and is used for decomposing the first combined signal into at least two paths of digital baseband signals with different frequency bands;
Each second radio frequency signal processing module is connected with the second digital signal processing module, and each second radio frequency signal processing module is used for converting each path of digital baseband signal into at least two paths of radio frequency signals with amplified power;
The filter is connected with at least two second radio frequency signal processing modules and is used for carrying out filtering processing on the radio frequency signals with amplified power.
7. The communication system according to claim 6, wherein the signal access unit further comprises a first photoelectric conversion module, the first photoelectric conversion module being connected to the first digital signal processor, the first photoelectric conversion module being configured to convert the first combined signal into an optical signal.
8. The communication system for subway tunnel according to claim 7, wherein the signal remote unit further comprises a second photoelectric conversion module, the second photoelectric conversion module is connected with the first photoelectric conversion module and the second digital signal processing module, and the second photoelectric conversion module is used for converting the optical signal into the first combined signal.
9. The communication system for subway tunnel according to claim 8, wherein the signal remote unit further comprises a power module, the power module is respectively connected to the second photoelectric conversion module, the second digital signal processing module and the at least two second radio frequency signal processing modules, and the power module is used for supplying power to the second photoelectric conversion module, the second digital signal processing module and the at least two second radio frequency signal processing modules.
10. The communication system according to any of claims 1-9, further adapted for signal uplink, wherein the antenna unit is further adapted to receive a reverse signal and to transmit the reverse signal back to the branching unit by a reverse process of signal downlink.
Priority Applications (1)
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| CN202420526072.9U CN221948173U (en) | 2024-03-18 | 2024-03-18 | A communication system suitable for subway tunnels |
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| CN202420526072.9U CN221948173U (en) | 2024-03-18 | 2024-03-18 | A communication system suitable for subway tunnels |
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