WO2012092810A1 - Système distant à radiofréquences numériques multimodes - Google Patents

Système distant à radiofréquences numériques multimodes Download PDF

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Publication number
WO2012092810A1
WO2012092810A1 PCT/CN2011/084259 CN2011084259W WO2012092810A1 WO 2012092810 A1 WO2012092810 A1 WO 2012092810A1 CN 2011084259 W CN2011084259 W CN 2011084259W WO 2012092810 A1 WO2012092810 A1 WO 2012092810A1
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WIPO (PCT)
Prior art keywords
signal
baseband
optical
router
digital radio
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PCT/CN2011/084259
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English (en)
Chinese (zh)
Inventor
叶祖铨
陈春海
黄伯宁
伍尚坤
李龙芳
Original Assignee
京信通信系统（中国）有限公司
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Publication of WO2012092810A1 publication Critical patent/WO2012092810A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/10—Access point devices adapted for operation in multiple networks, e.g. multi-mode access points
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/085—Access point devices with remote components

Definitions

  • the invention relates to the field of digital repeater system design, in particular to a multi-mode digital radio remote system.
  • the digital radio remote system as an extension and supplement of the base station in the overlay network can improve the signal quality, solve the problem of dropped calls in the weak signal area and the blind area, and becomes an important part of the coverage of the mobile communication network.
  • 2G networks and 3G networks in mobile communication networks will coexist for a long time.
  • Mobile operators currently have TD licenses for 3G networks and 2G networks that have been in operation, plus more and more widely used WLAN networks, and 2G, 3G and WLAN transmissions.
  • the multi-mode digital radio remote system will save operators a lot of cost for multi-network co-construction, and will bring great convenience to multi-network co-construction projects, so it has broad market prospects.
  • the GSM downlink of the system is directly coupled with the downlink signal from the base station through the GSM relay end, and transmitted to the remote coverage machine through the optical fiber, and is covered by the amplification process;
  • the GSM uplink is a signal transmitted from the remote coverage machine to the relay terminal and then connected to the base station receiving end through the coupler.
  • the TD downlink is the TD near-end direct coupling downlink signal from the TD-RRU, which is transmitted to the remote coverage machine through the optical fiber, and is covered after being amplified;
  • the TD uplink is the signal passing through the coupler after being transmitted from the remote coverage machine to the relay terminal. Connect to the TD-RRU receiver.
  • WLAN transmission provides a transparent baseband transmission link between the GSM near-end and the far-end or between the TD near-end and the far-end, making full use of existing fiber resources.
  • the present invention discloses a multi-mode digital radio remote system capable of solving a multi-mode digital radio frequency when a plurality of different network standard relay terminals are not in the same place and there is no fiber resource connection between them.
  • the application of the remote system is limited.
  • a multi-mode digital radio remote system comprising at least one remote coverage machine, a baseband router and a plurality of near-end relays; the remote coverage machine is connected to the baseband router, and the baseband routers are respectively connected to the respective near-end relays ;
  • the baseband router is configured to receive signals of different standards in the plurality of near-end repeaters, perform merge processing, and send the combined signals to the remote coverage machine; and receive signals in the remote coverage machine to perform split processing.
  • the split signals are sent to the respective near-end repeaters of the corresponding system.
  • the multi-mode digital radio remote system of the present invention combines signals of various standards with a baseband router before each of the near-end relay ends of different systems are pulled far to the far end, so that signals of various standards can be
  • the optical fiber is transmitted in a fiber, and the combined signal is covered by the remote coverage machine for multi-network coverage, so that the flexible application of the multi-mode digital radio remote system can be realized; and the radio remote system of the invention can save a large amount of fiber
  • the resources and networking are flexible and convenient, and have a good market prospect.
  • FIG. 1 is a schematic diagram of a multi-mode digital radio remote system
  • 2 is a block diagram of a baseband router hardware digital module
  • 3 is a downlink transmission link diagram of a baseband router
  • 4 is a diagram of an uplink transmission link of a baseband router
  • FIG. 5 is a schematic diagram of a multi-mode digital radio remote system according to a specific embodiment
  • FIG. 6 is a schematic diagram of a multi-mode digital radio remote system according to a second embodiment.
  • the invention provides a multi-mode digital radio remote system, which can solve the multi-mode digital radio frequency in the case where the relay terminals of different network standards are not in the same place in the prior art, and there is no fiber resource connection between the two places.
  • the application of the remote system is limited.
  • the multi-mode digital radio remote system comprises at least one remote coverage machine, a baseband router and a plurality of near-end relay machines, the remote coverage machine is connected with the baseband router, and the baseband router is also respectively relayed with each near-end Machine connection; the function of the baseband router is to receive signals of different standards in multiple near-end repeaters, send the signals to the remote coverage machine after the merge processing; and receive the signals in the remote coverage machine, after the split processing
  • the signals are sent to the respective near-end repeaters of the corresponding system, as shown in FIG.
  • the multi-mode digital radio remote system of the present invention includes a GSM relay, a TD relay, a remote coverage machine, and a baseband router.
  • FIG. 2 shows the hardware digital block diagram of the baseband router.
  • the baseband router includes the FPGA chip, CPU, power supply POWER, two optical ports OP1 and OP2 connected to the near-end relay, and two TLK1501 (serializer). /Deserializer), one TLK4015 (serializer/deserializer), four optical ports OP1', OP2', OP3' and OP4' connected to different remote coverage machines.
  • OP1 and OP2 realize the serial/parallel conversion of the signal through the TLK1501 to send the signal to the FPGA chip.
  • the FPGA chip After the FPGA chip merges or splits the signal according to the requirements, the signal is combined/stringed through the TLK4015. Convert and send signals to optical ports OP1', OP2', OP3' and OP4' respectively; POWER provides power for the baseband router, and the CPU is connected to the FPGA chip. Its function is to monitor and control the baseband router.
  • the CPU and the FPGA chip are packaged into one module, which is called a baseband processing unit.
  • each optical port in the baseband router corresponds to an optical/electrical conversion module, and the optical/electrical conversion module functions to perform optical/electrical conversion, that is, convert the optical signal received from the optical fiber into an electrical signal. Or convert an electrical signal into an optical signal.
  • the downlink baseband transmission process of the baseband router firstly receives signals of different standards in the respective near-end relays connected thereto through two optical/electrical conversion modules (here specifically includes a GSM downlink signal, a TD-A downlink signal, TD-F downlink signal and WLAN signal), performing optical/electrical conversion, serial/parallel processing, and then sending the signal to the FPGA chip in the baseband processing unit.
  • two optical/electrical conversion modules here specifically includes a GSM downlink signal, a TD-A downlink signal, TD-F downlink signal and WLAN signal
  • the FPGA chip has a preset program, and the running rule according to the program will be
  • the multi-channel signals of these different systems are combined, that is, the GSM downlink signal, the TD-A downlink signal, the TD-F downlink signal and the WLAN signal are combined, and the combined signals are subjected to parallel/serial processing and then sent to four lights respectively.
  • the /electric conversion module the four optical/electrical conversion modules send signals to the remote coverage machines connected to them respectively, and finally complete the downlink baseband transmission of the baseband router, as shown in FIG.
  • the FPGA chip needs to perform a splitting process before the multi-path signal combining, that is, splitting the GSM downlink signal and the WLAN signal, or the TD-A downlink signal, the TD-F downlink signal, and the WLAN.
  • the signals are split and then the combined signals of the separate systems are combined for a total combination, since the signals received from the respective near-end repeaters are not separate signals but a single A small range of combined signals, so it is necessary to first split the signal in a small range, and then perform the total signal combination.
  • the baseband transmission process of the baseband router receives the signal through one or more of the four optical/electrical conversion modules that communicate with the remote coverage machine (depending on the number of links of the cascaded remote coverage machine) for optical/electrical Conversion, parallel/serial processing, and then sending the signal to the FPGA chip in the baseband processing unit.
  • the FPGA chip first splits the signals of different standards according to a preset program, and uses the GSM uplink signal and the TD-A uplink signal.
  • the TD-F uplink signal and the WLAN signal are split, and then the GSM uplink signal and the WLAN signal are combined and sent to an optical/electrical conversion module that communicates with the near-end relay machine, and the TD-A uplink signal and the TD-F uplink are used.
  • the signal and WLAN signals are combined and sent to an optical/electrical conversion module that communicates with another near-end relay, and the baseband transmission process of the baseband router ends, as shown in FIG.
  • the baseband router of the present invention has four optical ports connected to the remote coverage device, corresponding to four optical/electrical conversion modules, and the signals transmitted by the four optical/electrical conversion modules are the same. Therefore, a baseband router can pull four remote coverage machines, and can realize multi-mode digital radio remote system star-shaped networking, daisy-chain networking, hybrid networking, and ring networking, etc. The networking of the far system brings great flexibility.
  • the GSM relay, the TD relay, and the remote coverage unit also include a baseband processing unit, and the function of the baseband processing unit is to perform signal splitting.
  • the devices are located, combined, and monitored and controlled separately. Therefore, the near-end repeaters and the remote overlay machines can also split and merge the signals.
  • the working process of the near-end relay is: in the downlink direction, the near-end relays of different standards receive the corresponding standard signals sent by the corresponding base station, such as the GSM signal sent by the GSM base station received by one of the relays, and the other
  • the TD signal sent by the relay machine for the TD-RRU is then combined with the WLAN signal in the respective near-end relay, or the TD signal is combined with the WLAN signal, and then the combined signals are respectively sent.
  • the near-end relays of different systems receive the WLAN signal in the baseband router and the signal of the corresponding standard, such as the GSM relay receiving the WLAN signal and the GSM signal, respectively, or in the TD
  • the relay receives the WLAN signal and the TD signal, performs the splitting process, and sends the signal of the corresponding standard to the corresponding base station, that is, the GSM signal is sent to the GSM base station, and the TD signal is sent to the TD-RRU, and the WLAN signal is The wireless signal is transmitted directly in each repeater.
  • the working process of the remote coverage machine is: in the downlink direction, the remote coverage machine receives the combined signal (GSM+TD-A+TD-F+WLAN) in the baseband router, and performs split processing to become a separate GSM signal, TD. -A signal, TD-F signal or WLAN signal, and then separately cover (send to the user) these separate signals; in the uplink direction, the remote coverage machine receives signals from the corresponding systems in the air and WLAN signals, The merging process is sent to the baseband router, where the corresponding standard signal refers to a GSM signal or a TD signal (including a TD-A signal and a TD-F signal).
  • the GSM relay terminal is composed of the following modules: a relay duplexer 100, a down conversion module 101, an A/D converter 102, a digital down conversion channel 103, a baseband processing unit 104, and a digital upconversion.
  • the TD relay machine is composed of the following modules: a relay duplexer 200, a circulator 201, a down conversion module 202, an A/D converter 203, a digital down conversion channel 204, a baseband processing unit 205, and a digital up-conversion channel.
  • the remote coverage device is composed of the following modules: optical/electrical conversion module 401, optical/electrical conversion module 402, optical/electrical conversion module 403, baseband processing unit 404, transceiver duplexer 405, digital upconversion channel 411, D/A The converter 414, the up-conversion module 415, the downlink power amplifier 416, the circulator 417, the digital down conversion channel 421, the A/D converter 422, the down-conversion module 423, the uplink low-noise amplifier module 424, the digital up-conversion channel 431, D /A converter 434, upconversion module 435, downlink power amplifier 436, circulator 437, digital down conversion channel 441, A/D converter 442, down conversion module 443, uplink low noise amplifier module 444, digital up conversion channel 451 , D / A converter 454, upconversion module 455, downlink power amplifier 456, digital down conversion channel 461, A / D converter 462, down conversion module 463, uplink low noise amplifier module 464; 404, 411, 414, 4
  • Ring 404 is also connected to the 401, 402 and 403 respectively, the optical fiber 402 by the baseband communication routers, 405 and 417 are also connected to the 437, 405 by covering / reception antenna 406 receives a signal or covering the air.
  • the entire GSM uplink transmission process will be described in detail below with reference to FIG.
  • the GSM radio frequency signal received by the coverage/receiving antenna 406 from the air is transmitted to the transceiver duplexer 405, and the transceiver duplexer filters out other useless signals to obtain a relatively pure uplink RF signal, and the uplink RF signal passes through the uplink low noise amplifier module 464.
  • the amplitude will be amplified by about 40dB, and then the down-conversion module 463 will be down-converted to the analog intermediate frequency signal.
  • the analog intermediate frequency signal passes through the A/D converter 462, it becomes a digital signal and passes through the digital down conversion channel 461.
  • the FPGA chip processes the signal, and modulates the signal according to a certain protocol (such as CPRI protocol), and the signal after the framing and the TD-A uplink.
  • a certain protocol such as CPRI protocol
  • the framing signal, the TD-F uplink framing signal, and the WLAN signal are combined, and the combined signal is transmitted to the optical/electrical conversion module 402.
  • the optical/electrical conversion module the signal is converted from the electrical signal to the light.
  • the signal is transmitted in the optical fiber, and the signal is transmitted through the optical fiber to the optical/electrical conversion module 304 of the baseband router, and the optical/electrical conversion module performs optical/electrical conversion to convert the optical signal into
  • the signal passes through the baseband processing unit 303, and the FPGA chip splits and combines the signals, and separates the GSM uplink signal, the TD-A uplink signal, the TD-F uplink signal, and the WLAN signal, and combines the GSM uplink signal and the WLAN signal.
  • the signal is sent to the optical/electrical conversion module 301.
  • the signal is converted from an electrical signal to an optical signal, and transmitted in an optical fiber, and the signal is transmitted to the optical/electrical conversion module 106 of the GSM relay terminal through the optical fiber, and passed through
  • the optical/electrical conversion module converts the optical signal into an electrical signal, and then passes through the baseband processing unit 104, and the FPGA chip splits the signal, splits the GSM uplink signal and the WLAN signal, deframing the GSM signal, and passes through the digital up-conversion channel 113.
  • the baseband signal is converted into an intermediate frequency digital signal, converted into an analog intermediate frequency signal by the D/A converter 112, converted into a radio frequency signal by the up-conversion module 111, and transmitted to the base station via the relay duplexer 100.
  • the GSM downlink is a signal that is properly coupled to the base station.
  • the coupled signal must have an appropriate range, that is, the power of the device must be pushed out and the coupled signal cannot be made too large.
  • the signal coupled by the base station passes through the duplexer 100 to ensure a pure downlink signal.
  • the downlink RF signal is down-converted to an analog intermediate frequency signal, and the analog intermediate frequency signal passes through the A/D converter 102.
  • the digital signal is converted into a baseband signal after passing through the digital down conversion channel 103, and then enters the baseband processing unit 104.
  • the FPGA chip processes the signal and framing the signal according to a certain protocol (such as CPRI protocol).
  • the signal after the framing is combined with the WLAN signal, and the combined signal is transmitted to the optical/electrical conversion module 106.
  • the signal is converted from an electrical signal to an optical signal, and transmitted in the optical fiber.
  • the optical fiber is transmitted to the optical/electrical conversion module 301 of the baseband router to perform optical/electrical conversion, convert the optical signal into an electrical signal, and then pass through the baseband processing unit 303, and the FPGA chip splits and combines the signals to convert the GSM downlink signal and the WLAN.
  • the signal is split and then recombined, and the GSM downlink signal, the TD-A downlink signal, the TD-F downlink signal and the WLAN signal are combined and sent to the baseband routing.
  • the optical/electrical conversion module 304 converts the electrical signal into an optical signal through the optical/electrical conversion module, and transmits the optical signal to the optical fiber, and the signal is transmitted to the remote coverage optical/electrical conversion module 402 through the optical fiber to convert the optical signal into electricity.
  • the signal passes through the baseband processing unit 404, and the FPGA chip processes the signal, and performs GSM downlink signal, TD-A downlink signal, TD-F downlink signal and WLAN signal for branch processing, GSM downlink signal de-frame, and digital up-conversion channel.
  • the baseband signal is up-converted to an intermediate frequency digital signal, converted into an analog intermediate frequency signal by a D/A converter 454, and is up-converted to an RF signal by an up-conversion module 455, and the amplified signal is amplified by a power amplifier 456, and then transmitted and received.
  • the worker 405 is then passed to the overlay/receiver antenna 406 for coverage.
  • the TD-A uplink receiving antenna receives the TD-A radio frequency signal from the air and transmits it to the transceiver duplexer 405.
  • the transceiver duplexer filters out other unnecessary signals to obtain a relatively pure uplink radio frequency signal, and the uplink radio frequency signal passes through the circulator 417.
  • the uplink low noise amplifier module 424 and the low noise amplifier module will be amplified by about 30 dB, and then the down conversion module 423, the uplink RF signal will be downconverted to the analog intermediate frequency signal, and the analog intermediate frequency signal passes through the A/D converter 422 to become a digital signal. After passing through the digital down conversion channel 421, it becomes a baseband signal, and then enters the baseband processing unit 404.
  • the FPGA chip processes the signal, and the signal is framing according to a certain protocol (such as CPRI protocol), framing
  • a certain protocol such as CPRI protocol
  • framing The subsequent signal is combined with the signal after the GSM uplink framing, the signal after the TD-F uplink framing, and the WLAN signal, and the combined signal is transmitted to the optical/electrical conversion module 402, where the signal is in the optical/electrical conversion module.
  • the electrical signal is converted into an optical signal and transmitted in an optical fiber.
  • the signal is transmitted to the optical/electrical conversion module 304 of the baseband router through the optical fiber, and optical/electrical conversion is performed through the optical/electrical conversion module.
  • the signal is converted into an electrical signal, and after passing through the baseband processing unit 303, the FPGA chip splits and combines the signals, and separates the GSM uplink signal, the TD-A uplink signal, the TD-F uplink signal, and the WLAN signal, and then TD- The A uplink signal, the TD-F uplink signal and the WLAN signal are combined and sent to the optical/electrical conversion module 302 of the baseband router through the optical/electrical conversion module, and the signal is converted from the electrical signal to the optical signal, and transmitted in the optical fiber, and the signal is transmitted through the optical fiber.
  • the optical signal is converted into an electrical signal, passed through the baseband processing unit 205, and the FPGA chip in the baseband processing unit 205 splits the signal to convert the TD-A uplink signal,
  • the TD-F uplink signal is split with the WLAN signal, and then the TD-A signal is deframed, passed through the digital up-conversion channel 213, and the baseband signal is upconverted to an intermediate frequency digital signal, passed through the D/A converter 212 and the up-conversion module 211, and the signal
  • the up-conversion is a radio frequency signal, passes through the circulator 201 and the relay duplexer 200, and is transmitted to the TD-RRU.
  • the TD-A downlink is a signal that is properly coupled to the TD-RRU.
  • the coupled signal must have an appropriate range, that is, the power of the device must be pushed out and the coupled signal cannot be made too large.
  • the signal coupled by the TD-RRU passes through the duplexer duplexer 200 to ensure a pure downlink signal.
  • the downlink RF signal will be down-converted to an analog intermediate frequency signal, and the analog intermediate frequency signal passes through the A/ After the D converter 203, it becomes a digital signal, becomes a baseband signal after passing through the digital down conversion channel 204, and then enters the baseband processing unit 205.
  • the FPGA chip processes the signal according to a certain protocol (such as CPRI).
  • the protocol combines the signal framing, the signal after the framing with the downlink signal and the WLAN signal after the TD-F framing, and the combined signal is transmitted to the optical/electrical conversion module 206, in the optical/electrical conversion module,
  • the signal is converted from an electrical signal to an optical signal and transmitted in an optical fiber.
  • the signal is transmitted through an optical fiber to an optical/electrical conversion module 302 of the baseband router for optical/electrical conversion, converting the optical signal into an electrical signal, and performing baseband processing via the baseband processing unit 303.
  • the FPGA chip splits and combines the signals, and splits the TD-A downlink signal, the TD-F downlink signal and the WLAN signal, and then recombines the GSM downlink signal.
  • the TD-A downlink signal, the TD-F downlink signal and the WLAN signal are combined and sent to the optical/electrical conversion module 304 of the baseband router, and the signal is converted from the electrical signal to the optical signal through the optical/electrical conversion module, and transmitted in the optical fiber, and the signal passes through
  • the optical fiber is transmitted to the optical/electrical conversion module 402 of the remote coverage machine, and the optical signal is converted into an electrical signal, and the baseband processing is performed by the baseband processing unit 404.
  • the FPGA chip in the baseband processing unit 404 splits the signal, and the GSM is downlinked.
  • the signal, the TD-A downlink signal, the TD-F downlink signal and the WLAN signal are subjected to shunt processing, the TD-A downlink signal is deframed, converted into an intermediate frequency digital signal by the digital up-conversion channel 411, and converted into an intermediate frequency digital signal by the D/A converter 414.
  • the analog IF signal is up-converted into a radio frequency signal by the up-conversion module 415, passes through the downstream power amplifier 416 and the circulator 417, the amplified signal is transmitted to the overlay/receiver antenna 406 through the transceiver duplexer 405 for coverage.
  • TD-F The uplink and downlink transmission process of TD-F is the same as that of TD-A frequency band, and will not be described here.
  • the WLAN only provides one baseband transmission link for a transparent transmission of the WLAN.
  • the transmission process from the GSM relay to the remote coverage machine is as follows: in the GSM near-end, the WLAN optical signal passes through the optical/electrical conversion module 105, converts the optical signal into an electrical signal, and performs baseband processing by the baseband processing unit 104, the baseband
  • the FPGA chip in the processing unit 104 processes the signal, combines the signal framing according to a certain protocol (such as the CPRI protocol), and combines the signal after the framing with the downlink signal after the GSM group frame, and the combined signal is transmitted to the light.
  • a certain protocol such as the CPRI protocol
  • the signal in the optical / electrical conversion module, the signal is converted from an electrical signal to an optical signal, transmitted in the optical fiber, the signal is transmitted through the optical fiber to the optical / electrical conversion module 301 of the baseband router, optical / electrical conversion, The optical signal is converted into an electrical signal, and subjected to baseband processing by the baseband processing unit 303.
  • the FPGA chip splits and combines the signals, separates the GSM downlink signal and the WLAN signal, and then recombines the GSM downlink signal and TD-A.
  • the downlink signal, the TD-F downlink signal and the WLAN signal are combined and sent to the optical/electrical conversion module 304 of the baseband router, and the signal is converted from the electrical signal to the optical signal by the optical/electrical conversion module.
  • the optical fiber transmits the signal to the optical/electrical conversion module 402 of the remote coverage machine through the optical fiber, converts the optical signal into an electrical signal, passes through the baseband processing unit 404, and the FPGA chip performs baseband processing on the signal, and the GSM downlink signal, TD- The downlink signal, the TD-F downlink signal and the WLAN signal are branched, and the baseband data of the WLAN is sent to the optical/electrical conversion module 403 for processing.
  • the transmission process of the WLAN signal from the remote coverage machine to the GSM near-end relay is as follows:
  • the WLAN optical signal passes through the optical/electrical conversion module 403, converts the optical signal into an electrical signal, and passes through the baseband processing unit 404.
  • the FPGA chip performs baseband processing on the signal, and the signal will be according to a certain protocol (such as the CPRI protocol).
  • the framing, the signal after the framing is combined with the signal after the TD-A uplink framing, the signal after the TD-F uplink framing, and the signal after the GSM uplink framing, and the combined signal is transmitted to the optical/electrical
  • the conversion module 402 in the optical/electrical conversion module converts the signal from the electrical signal to the optical signal, and transmits the signal in the optical fiber, and the signal is transmitted through the optical fiber to the optical/electrical conversion module 304 of the baseband router, and the optical/electrical conversion module performs light/ Electrical conversion, converting the optical signal into an electrical signal, through the baseband processing unit 303, the FPGA chip splits and combines the signals, and separates the GSM uplink signal, the TD-A uplink signal, the TD-F uplink signal, and the WLAN signal.
  • the GSM uplink signal and the WLAN signal are combined and sent to the optical/electrical conversion module 301.
  • the signal is converted from an electrical signal to an optical signal, and transmitted in an optical fiber, and the signal is transmitted to the GSM through the optical fiber.
  • the optical/electrical conversion module 106 of the relay machine converts the optical signal into an electrical signal through the optical/electrical conversion module, and then passes through the baseband processing unit 104, and the FPGA chip splits the signal to separate the GSM uplink signal from the WLAN signal.
  • the baseband data of the WLAN is sent to the optical/electrical conversion module 105 for processing.
  • the transmission of the WLAN from the TD near-end relay to the remote coverage machine and the transmission from the remote coverage machine to the TD near-end relay are the same as those of GSM, and are not described here.
  • the transmission bandwidth of the WLAN can be dynamically allocated. When the number of GSM carriers used is small or the number of TD carriers is small, the resources can be dynamically allocated to the WLAN, so that the WLAN has a larger transmission bandwidth.
  • the WLAN function system only provides one transparent baseband transmission, there is no fixed downlink data to be transmitted from the near-end relay to the remote coverage machine. It is also possible to transmit from the remote coverage machine to the near-end relay, so that the baseband is passed. After the router, the WLAN can realize all the transmission from the far end to all the near ends and all the near end to all the far ends, which greatly improves the range of WLAN baseband transmission in the multimode digital radio remote system.
  • the problem of clock synchronization is also addressed when combining different types of RF remote systems.
  • the clock synchronization scheme provided by the present invention is as follows: the whole system has only one clock, and the clock of the GSM relay terminal is set as the reference clock, and other devices in the whole system are clock-synchronized with the GSM relay terminal.
  • the baseband router adopts the clock extraction technology through the OP1 optical/electrical conversion module to realize clock synchronization after clock extraction.
  • the uplink and downlink of various signals can be in the same optical fiber while maintaining their respective independence. Transmission, so the system can use a pair of optical / electrical conversion modules, a single fiber to achieve a variety of signals.
  • selecting an optical/electrical conversion module having a wavelength division multiplexing function can better achieve this function.
  • An optical/electrical conversion module with wavelength division multiplexing can multiplex and transmit two different wavelengths of light to one optical fiber, so that the near-end repeater and the baseband router, the baseband router, and the remote coverage machine are Only one fiber connection is needed, which greatly saves fiber resources.
  • the multi-mode digital radio remote system disclosed by the invention combines signals of various standards through a baseband router, so that signals of various standards can be transmitted in one optical fiber, thereby realizing remote coverage.
  • This function of the baseband router determines that it is not only applicable to the TD+GSM+WLAN multimode digital radio remote system, but also can be applied to other multimode digital radio remote systems, such as WCDMA+GSM+WLAN multimode.
  • the remote coverage machine may also include CFR (Crest Factor Reduction, crest factor reduction) module, DPD (Digital Pre-Distortion, digital pre-distortion module, feedback down-conversion module and feedback A/D converter, CFR module is connected with digital up-conversion channel and DPD module respectively, DPD module is also connected with D/A converter, feedback The frequency conversion module is respectively connected with the downlink power amplifier and the feedback A/D converter, and the feedback A/D converter is also connected with the DPD module, as shown in FIG. 6.
  • CFR Rest Factor Reduction, crest factor reduction
  • DPD Digital Pre-Distortion, digital pre-distortion module, feedback down-conversion module and feedback A/D converter
  • CFR module is connected with digital up-conversion channel and DPD module respectively
  • DPD module is also connected with D/A converter
  • feedback The frequency conversion module is respectively connected with the downlink power amplifier and the feedback A/D converter
  • the feedback A/D converter is also connected with the DPD module, as shown in FIG. 6.
  • the baseband signal is up-converted to the intermediate frequency digital signal through the digital up-conversion channel 451
  • the signal is first subjected to peak-sampling processing by the CFR module 452, and then the DPD module 453 receives the signal transmitted in the CFR.
  • the DPD technology is used for further processing, and the processed signal is sent to the D/A converter.
  • the corresponding DPD module needs to couple a signal at the output end of the downlink power amplifier 456, that is, the feedback down-conversion module 457 receives the downlink power.
  • the signal in the amplifier 456 is converted into an analog intermediate frequency signal and sent to the feedback A/D converter 458; the feedback A/D converter converts the intermediate frequency signal into a digital signal, and sends it to the DPD module 453 and the forward signal for DPD algorithm. deal with.
  • the TD-A channel and the TD-F channel are similar to the GSM channel and will not be described here.
  • Applying CFR technology and DPD technology to multi-mode digital radio remote system can reduce signal peak-to-average ratio, improve signal linearity and overall machine efficiency, and make the whole structure more compact and lighter.
  • the multi-mode digital radio remote system is solved in the prior art where the relay terminals in the multi-mode digital radio remote system are not in the same place, and there is no fiber resource connection between the two places.
  • the application is limited.
  • the multi-mode digital radio remote system of the present invention has a separate near-end repeater, and the use of a baseband router improves the application limitations of the multi-mode digital radio remote system, and realizes a multi-mode digital radio remote system.
  • the flexible networking ensures remote multi-standard coverage, saves a lot of fiber resources, and has broad prospects in application.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Optical Communication System (AREA)

Abstract

L'invention concerne un système distant à radiofréquences numériques multimodes. Le système comprend au moins une machine de couverture à distance, un routeur de bande de base et une pluralité de relais locaux. La machine de couverture à distance est connectée au routeur de bande de base, et le routeur de bande de base est connecté à tous les relais locaux respectivement. Le routeur de bande de base est utilisé pour recevoir des signaux de modes différents provenant des relais locaux, et envoyer les signaux combinés à la machine de couverture à distance ; et recevoir des signaux provenant de la machine de couverture à distance, et envoyer les signaux divisés respectivement aux relais locaux des modes correspondants. L'invention résout le problème selon lequel l'application du système distant à radiofréquences numériques multimodes est limitée par les conditions selon lesquelles les relais locaux des modes différents ne sont pas aux mêmes endroits et qu'aucune fibre optique n'est connectée entre les relais, de sorte que la limitation d'application du système distant à radiofréquences numériques multimodes est atténuée, et l'application souple du système distant à radiofréquences numériques multimodes est réalisée. En outre, grâce à l'invention, de nombreuses ressources de fibres optiques sont économisées, la mise en réseau est commode et les perspectives du marché sont meilleures.
PCT/CN2011/084259 2011-01-04 2011-12-20 Système distant à radiofréquences numériques multimodes WO2012092810A1 (fr)

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CN110350976A (zh) * 2019-07-10 2019-10-18 深圳市思科泰技术股份有限公司 一种wjb-i型gsm-r数字光纤直放站
CN113938145A (zh) * 2021-11-11 2022-01-14 中国联合网络通信集团有限公司 一种信号传输系统及方法
CN115278703A (zh) * 2022-07-28 2022-11-01 西安电子科技大学 一种隐蔽可重构的卫星测运控网络装置及部署方法

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CN115278703B (zh) * 2022-07-28 2023-06-30 西安电子科技大学 一种隐蔽可重构的卫星测运控网络装置及部署方法

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