CN101668356B - Dual-mode digital radio remote unit (RRU) - Google Patents
Dual-mode digital radio remote unit (RRU) Download PDFInfo
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- CN101668356B CN101668356B CN2009101125446A CN200910112544A CN101668356B CN 101668356 B CN101668356 B CN 101668356B CN 2009101125446 A CN2009101125446 A CN 2009101125446A CN 200910112544 A CN200910112544 A CN 200910112544A CN 101668356 B CN101668356 B CN 101668356B
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Abstract
The invention discloses a dual-mode digital radio remote unit (RRU), comprising a near-end machine and a far-end machine, wherein, DCS and WCDMA base station signals are respectively coupled to the near-end machine from a transceiver station of a base station by a coupler; digital processing is carried out on the signals by the system, and digitalized signals are transferred according to standard CPRI protocol; DCS and WCDMA base station signals are respectively transferred to the far-end machine of each coverage area; and the far-end machine regenerates and amplifies the signals to realize remote coverage for the DCS and WCDMA base station signals. The dual-mode digital radio remote unit of the invention has the advantages that digital transmission and regenerative amplification can be simultaneously carried out on signals of 2G-standard DCS and 3G-standard WCDMA, and meanwhile, the dual-mode digital radio remote unit has star, daisy chain and mixed type networking properties, has obvious superiority in solving large area and long distance signal coverage, has important significance on reducing construction cost of 3G network in primary stage of 3G network construction, and has vast prospect for future development.
Description
[technical field]
The present invention relates to a kind of covering system of mobile communication signal, particularly relate to a kind of bimodule digital radio frequency stretch system.
[background technology]
In today that mobile communication develops rapidly; No matter the overlay area of which kind of radio communication is because blocking of radio frequency signal propagation characteristics and manual work or natural forms; Blind area, weak signal area appear through regular meeting; These zones occur easily that call completing rate is low, roaming is smooth, call drop even do not receive phenomenon such as signal, make troubles to the cellphone subscriber.Digital RF far-drawing system is a kind of relaying product; It can effectively solve this type of problem; It possesses that volume is little, cost is low, easy for installation, be convenient to advantage such as maintenance, become extremely important network optimization means, to improve communication quality; Solve the problems such as call drop of weak signal area and blind area, bring great convenience to networking.
Digital RF far-drawing system is a kind of based on software and radio technique; With the radiofrequency signal digitlization; At numeric field signal is handled transmission; Be the equipment that moves standard specially to 3G, for 2G analog optical fiber system, improved system's uplink and downlink link signal to noise ratio greatly, its covering power and coverage effect obviously are superior to the analog optical fiber system.Can predict, the coexistence of 2G and 3G network very over a long time in, the bimodule digital radio frequency stretch system that possesses 2G and 3G standard simultaneously will be the important network coverage equipment of mobile operator, has vast market prospect.
[summary of the invention]
Technical problem to be solved by this invention is to provide a kind of bimodule digital radio frequency stretch system that can the signal of two kinds of standards of WCDMA of the DCS (distributed control system, scattered control system) of 2G standard and 3G standard be carried out digitlization transmission and regenerative amplification simultaneously.
The present invention solves the problems of the technologies described above through following technical scheme: a kind of bimodule digital radio frequency stretch system; Comprise near-end machine and remote termination; Scattered control system DCS and WCDMA base station signal are coupled to the said near-end machine from base transceiver station through coupler respectively; Transmit to the digitized processing of signal and by the signal of standard universal public radio interface CPRI agreement after through system digitlization; DCS and WCDMA base station signal are transferred to the remote termination of each overlay area respectively, and said remote termination is realized the covering of zooming out of DCS and WCDMA base station signal with signal regeneration, amplification.
Said near-end machine comprises a WCDMA dielectric duplexer, a DCS dielectric duplexer, the first decay frequency-variable module that links to each other with a WCDMA dielectric duplexer, the second decay frequency-variable module that links to each other with a DCS dielectric duplexer, and is connected to decay first digital signal processing module of frequency-variable module of the first decay frequency-variable module and second; Powerful first power amplifier and first LNA that said remote termination comprises the 2nd WCDMA duplexer, the 2nd DCS duplexer, links to each other respectively with the 2nd WCDMA duplexer; Powerful second power amplifier and second LNA that link to each other respectively with the 2nd DCS duplexer; First frequency-variable module that links to each other with first power amplifier and first LNA, second frequency-variable module that links to each other with second power amplifier and second LNA, and second digital signal processing module that is connected to first frequency-variable module and second frequency-variable module; First digital signal processing module of said near-end machine is connected to second digital signal processing module of remote termination through optical fiber;
The down link of this bimodule digital radio frequency stretch system is: DCS and WCDMA downstream signal are respectively through a WCDMA dielectric duplexer and the DCS dielectric duplexer of coupler from the near-end machine that is coupled to of base transceiver station main antenna; Through first the decay frequency-variable module down-conversion with fading to the WCDMA intermediate-freuqncy signal under the WCDMA signal; Through second the decay frequency-variable module down-conversion with fading to the DCS intermediate-freuqncy signal under the DCS signal; But respectively DCS and WCDMA intermediate-freuqncy signal are carried out the A/D bandpass sampling by first digital signal processing module then and reach opereating specification; After respectively the DCS after the digitlization and WCDMA intermediate-freuqncy signal being carried out Digital Down Convert and carried out multistage low-pass filtering treatment again, be packaged into second digital signal processing module of Serial Data Transfer Mode to remote termination again by the CPRI standard frame format; After second digital signal processing module of remote termination is received after the data it is separated frame, configuration by the CPRI agreement; The process Digital Up Convert is also carried out multistage low-pass filtering treatment; Respectively the signal after DCS and the WCDMA digitlization is reverted to intermediate-freuqncy signal by 2 road D/A again; The up-conversion of warp first frequency-variable module is with fading to radiofrequency signal on the WCDMA signal again; The up-conversion of warp second frequency-variable module is with fading to radiofrequency signal on the DCS signal, and the WCDMA radiofrequency signal that recovers is at last amplified, is emitted to the overlay area through the 2nd WCDMA duplexer from retransmitting antenna through first power amplifier respectively; The DCS radiofrequency signal that recovers is at last amplified, is emitted to the overlay area through the 2nd DCS duplexer from retransmitting antenna through second power amplifier;
The up link of this bimodule digital radio frequency stretch system is: the WCDMA upward signal is through after the 2nd WCDMA duplexer Filtering Processing of remote termination; Amplify through first low noise amplifier, the WCDMA signal after the amplification gets into first frequency-variable module with changing to intermediate-freuqncy signal under the WCDMA signal; The DCS upward signal is through after the 2nd DCS duplexer Filtering Processing of remote termination; Amplify through second low noise amplifier; DCS signal after the amplification gets into second frequency-variable module with changing to intermediate-freuqncy signal under the DCS signal; Respectively it is carried out the A/D bandpass sampling by second digital signal processing module then; Again WCDMA after the digitlization and DCS intermediate-freuqncy signal are carried out Digital Down Convert and multistage low-pass filtering treatment, wherein the DCS signal is accomplished noise suppressing function and handle, WCDMA and DCS signal are packaged into first digital signal processing module that transfers to the near-end machine after the serial data by the CPRI standard frame format again; After first digital signal processing module of near-end machine is received after the data it is separated frame, configuration by the CPRI agreement; The process Digital Up Convert is also carried out multistage low-pass filtering treatment; Respectively the signal after WCDMA and the DCS digitlization is reverted to intermediate-freuqncy signal by 2 road D/A again; The up-conversion of the warp first decay frequency-variable module is with fading to radiofrequency signal on the WCDMA signal again; The up-conversion of the warp second decay frequency-variable module is with fading to radiofrequency signal on the DCS signal, at last through through coupler WCDMA and DCS signal being coupled respectively to base transceiver station again after a WCDMA dielectric duplexer, the DCS dielectric duplexer filtering.
The structure and the operation principle of said first digital signal processing module and second digital signal processing module are all identical; Said first digital signal processing module and second digital signal processing module include 2 D/A converter modules, 2 analog-to-digital conversion modules, a digital processing element, a Sedes module, an optical fiber transceiver module, a MCU; And one clock produce and distribution module; The input of said 2 D/A converter modules is connected respectively to digital processing element; The output of 2 analog-to-digital conversion modules is connected respectively to digital processing element; MCU controls 2 D/A converter modules, 2 analog-to-digital conversion modules, digital processing element, Sedes module simultaneously; And clock generating and distribution module, clock generating and distribution module are respectively 2 D/A converter modules, 2 analog-to-digital conversion modules, digital processing element and Sedes modules provide reference clock;
The signal input link of this first digital signal processing module and second digital signal processing module is: after WCDMA and DCS intermediate-freuqncy signal are passed through the bandpass sampling of analog-to-digital conversion module respectively; Through digital processing element the digital signal after the analog-to-digital conversion module sampling is carried out Digital Down Convert and multistage low-pass filtering treatment; Wherein the DCS downstream signal is carried out the envelope detection of power; The synchronizing clock signals of obtaining former base station is as the up time division signal of DCS is carried out synchronously; And the power of each data feedback channel detected respectively in real time; When detecting the reference thresholds that signal power surpass to be provided with, then immediately this passage being carried out passage during current time slots opens and handles; Otherwise this passage remains closed condition, and WCDMA and DCS signal, carry out framing and packing and through the Sedes module serial data sent to remote termination through the optical fiber transceiver module data by standard C PRI frame format then to baseband signal through Digital Down Convert;
The signal output link of this first digital signal processing module and second digital signal processing module is: the serial data that the optical fiber transceiver module is received is through the Sedes module and by digital processing element it is carried out CPRI and separate frame and transfer WCDMA and each carrier wave of DCS to baseband signal; Then through Digital Up Convert and multistage LPF; WCDMA and each carier restoration of DCS are arrived corresponding frequency; Then carry out the carrier data stack, respectively WCDMA and DCS signal are reduced to intermediate-freuqncy signal through 2 way mould modular converters at last.
Said digital processing element adopts fpga chip.
The structure and the operation principle of the first decay frequency-variable module of said near-end machine, first frequency-variable module of second decay frequency-variable module and remote termination, second frequency-variable module are all identical; The structure of the first decay frequency-variable module, the second decay frequency-variable module, first frequency-variable module, second frequency-variable module comprises first dielectric filter, the first high linear mixer, first intermediate frequency amplifier, the first intermediate frequency SAW filter, second intermediate frequency amplifier, the second intermediate frequency SAW filter, the 3rd intermediate frequency amplifier, the second high linear mixer, second dielectric filter, signal amplifier, the 3rd dielectric filter, CPU respectively; And 2 phase-locked loops; The output of said 2 phase-locked loops is connected respectively to the first high linear mixer and the second high linear mixer, and CPU is responsible for phase-locked loop is locked control mutually;
The down link of this first decay frequency-variable module, the second decay frequency-variable module, first frequency-variable module, second frequency-variable module: the RF signal of DCS and WCDMA is come in the back through after the first dielectric filter filtering; Be down-converted to intermediate-freuqncy signal IF through the first high linear mixer earlier; Intermediate-freuqncy signal is carried out the intermediate frequency filtering processing through the first intermediate frequency SAW filter again after first intermediate frequency amplifier amplifies, again the intermediate-freuqncy signal of output DCS and WCDMA after second intermediate frequency amplifier amplifies;
The up link of this first decay frequency-variable module, the second decay frequency-variable module, first frequency-variable module, second frequency-variable module: the intermediate-freuqncy signal IF of DCS and WCDMA carries out intermediate frequency filtering through the second intermediate frequency SAW filter earlier to be handled;, the 3rd intermediate frequency amplifier upconverts to the RF signal through the second high linear mixer again after amplifying; Amplify the last RF signal of exporting DCS and WCDMA again through one the 3rd dielectric filter filtering after the mixing again through the second dielectric filter filtering and signal amplifier.
Said phase-locked loop adopts the LMX2531 chip, is the integrated chip of a VCO+PLL, the clock that its reference clock adopts first digital signal processing module or second digital signal processing module to provide.
The advantage of bimodule digital radio frequency stretch system of the present invention is: can the signal of two kinds of standards of WCDMA of the DCS of 2G standard and 3G standard be carried out digitlization transmission and regenerative amplification simultaneously; Simultaneously it has star-like, chrysanthemum chain and mixed type networking characteristic; Have clear superiority when covering solving large tracts of land, long range signals, this system has recurrent signal quality desirable (optical transmission loss can not impact the radio frequency signal to noise ratio), networking mode flexibly, base station side is disturbed technical characterstics such as little.Therefore, in the primary stage that 3G network is built, the digital RF far-drawing system that possesses bimodulus is significant to the construction cost that reduces 3G network, has vast potential for future development.
[description of drawings]
Combine embodiment that the present invention is done further description with reference to the accompanying drawings.
Fig. 1 is a bimodule digital radio frequency stretch system networking work sketch map of the present invention.
Fig. 2 is the composition frame chart of bimodule digital radio frequency stretch system of the present invention.
Fig. 3 is the connection and the principle general diagram of bimodule digital radio frequency stretch system of the present invention.
Fig. 4 is the digital signal processing module principle schematic in the bimodule digital radio frequency stretch system of the present invention.
Fig. 5 is the work sketch map of frequency-variable module of decay frequency-variable module and remote termination of the near-end machine of bimodule digital radio frequency stretch system of the present invention.
[embodiment]
Problem in view of above-mentioned existence; This paper provides a kind of bimodule digital radio frequency stretch system; System is that radio base band control (Radio Server) and remote termination are that Remote Radio Unit (RRU) two parts are formed by the near-end machine; Connect through optical fiber between the two, its interface is based on open C PRI interface, can stably be connected with mainstream vendor's equipment.
1, bimodule digital radio frequency stretch system networking working method.
See also Fig. 1; DCS and WCDMA base station signal are coupled to the near-end machine of bimodule digital radio frequency stretch system from base transceiver station (BTS) through coupler respectively; Transmit to the digitized processing of signal and by the signal of standard C PRI agreement after through system digitlization; DCS and WCDMA base station signal are transferred to the remote termination of each overlay area respectively, utilize remote termination, realize the covering of zooming out of DCS and WCDMA base station signal signal regeneration, amplification.Because system can carry out star-like, daisy chain and mixed type networking characteristic; Therefore can carry out extensive networking continuously; Be particularly suitable for solving the signal covering (like high-speed railway, residential quarters etc.) that covers the occasion of having relatively high expectations for continuity; The bimodule digital radio frequency stretch system not only can well solve the signal covering problem in this replace mode, can also solve the intensive height in sub-district and the sub-district of being caused switch because of difficulty and problems such as network quality deterioration.
2, the concrete composition and the active channel of bimodule digital radio frequency stretch system.
See also Fig. 2; The near-end machine of this bimodule digital radio frequency stretch system comprises a WCDMA dielectric duplexer, a DCS dielectric duplexer, the first decay frequency-variable module that links to each other with a WCDMA dielectric duplexer, the second decay frequency-variable module that links to each other with a DCS dielectric duplexer, and is connected to decay first digital signal processing module of frequency-variable module of the first decay frequency-variable module and second.Powerful first power amplifier and first LNA that the remote termination of this bimodule digital radio frequency stretch system comprises the 2nd WCDMA duplexer, the 2nd DCS duplexer, links to each other respectively with the 2nd WCDMA duplexer; Powerful second power amplifier and second LNA that link to each other respectively with the 2nd DCS duplexer; First frequency-variable module that links to each other with first power amplifier and first LNA, second frequency-variable module that links to each other with second power amplifier and second LNA, and second digital signal processing module that is connected to first frequency-variable module and second frequency-variable module.First digital signal processing module of said near-end machine is connected to second digital signal processing module of remote termination through optical fiber.
Wherein a WCDMA dielectric duplexer refers to the existing various dielectric duplexers that can handle the WCDMA signal, and a DCS dielectric duplexer refers to the existing various dielectric duplexers that can handle the DCS signal.The 2nd WCDMA duplexer refers to the existing various duplexers that can handle the WCDMA signal, and the 2nd DCS duplexer refers to the existing various duplexers that can handle the DCS signal.
Please consult Fig. 3 simultaneously; The down link of this bimodule digital radio frequency stretch system is: DCS and WCDMA downstream signal are coupled to a WCDMA dielectric duplexer and a DCS dielectric duplexer of near-end machine respectively from the downstream signal of base transceiver station (BTS) main antenna through coupler; Through first the decay frequency-variable module down-conversion with fading to the WCDMA intermediate-freuqncy signal under the WCDMA signal; Through second the decay frequency-variable module down-conversion with fading to the DCS intermediate-freuqncy signal under the DCS signal; But respectively DCS and WCDMA intermediate-freuqncy signal are carried out the A/D bandpass sampling by first digital signal processing module then and reach opereating specification; After respectively the DCS after the digitlization and WCDMA intermediate-freuqncy signal being carried out the processing of Digital Down Convert numeric fields such as (DDC) again, be packaged into second digital signal processing module of Serial Data Transfer Mode to remote termination again by the CPRI standard frame format; After second digital signal processing module of remote termination is received after the data it is separated frame, configuration by the CPRI agreement; Process Digital Up Convert (DUC) is also carried out multistage low-pass filtering treatment; Respectively the signal after DCS and the WCDMA digitlization is reverted to intermediate-freuqncy signal by 2 road D/A again; The up-conversion of warp first frequency-variable module is with fading to radiofrequency signal on the WCDMA signal again; The up-conversion of warp second frequency-variable module is with fading to radiofrequency signal on the DCS signal, and the WCDMA radiofrequency signal that recovers is at last amplified, is emitted to the overlay area through the 2nd WCDMA duplexer respectively from retransmitting antenna through first power amplifier respectively; The DCS radiofrequency signal that recovers is at last amplified, is emitted to the overlay area through the 2nd DCS duplexer respectively from retransmitting antenna through second power amplifier.
The up link of this bimodule digital radio frequency stretch system is: the WCDMA upward signal is through after the 2nd WCDMA duplexer Filtering Processing of remote termination; Amplify through first low noise amplifier, after the amplification the WCDMA signal get into first frequency-variable module with changing to intermediate-freuqncy signal under the WCDMA signal; The DCS upward signal is through after the 2nd DCS duplexer Filtering Processing of remote termination; Amplify through second low noise amplifier; DCS signal after the amplification gets into second frequency-variable module with changing to intermediate-freuqncy signal under the DCS signal; Respectively it is carried out the A/D bandpass sampling by second digital signal processing module then; Again WCDMA after the digitlization and DCS intermediate-freuqncy signal are carried out Digital Down Convert (DDC) and multistage low-pass filtering treatment, wherein the DCS signal is accomplished noise suppressing function and handle, WCDMA and DCS signal are packaged into first digital signal processing module that transfers to the near-end machine after the serial data by the CPRI standard frame format again; After first digital signal processing module of near-end machine is received after the data it is separated frame, configuration by the CPRI agreement; Process Digital Up Convert (DUC) is also carried out multistage low-pass filtering treatment; Respectively the signal after WCDMA and the DCS digitlization is reverted to intermediate-freuqncy signal by 2 road D/A again; The up-conversion of the warp first decay frequency-variable module is with fading to radiofrequency signal on the WCDMA signal again; The up-conversion of the warp second decay frequency-variable module is with fading to radiofrequency signal on the DCS signal, at last through through coupler WCDMA and DCS signal being coupled respectively to base transceiver station (BTS) again after a WCDMA dielectric duplexer, the DCS dielectric duplexer filtering.
3, the workflow of digital signal processing module.
Consulting Fig. 4, is the principle schematic of second digital signal processing module of first digital signal processing module and the remote termination of near-end machine, and wherein the structure of first digital signal processing module and second digital signal processing module and operation principle are all identical.First digital signal processing module and second digital signal processing module include 2 D/A converter modules (D/A), 2 analog-to-digital conversion modules (A/D), a digital processing element, a Sedes module, an optical fiber transceiver module, a MCU (central control unit), and a clock produces and distribution module.The input of said 2 D/A converter modules (D/A) is connected respectively to digital processing element; The output of 2 analog-to-digital conversion modules (A/D) is connected respectively to digital processing element; MCU controls 2 D/A converter modules (D/A), 2 analog-to-digital conversion modules (A/D), digital processing element, Sedes (SerialDeserial goes here and there also, also goes here and there) module simultaneously; And clock generating and distribution module, clock generating and distribution module control 2 D/A converter modules (D/A), 2 analog-to-digital conversion modules (A/D), digital processing element and Sedes module.Wherein digital processing element adopts fpga chip.
The signal input link of this first digital signal processing module and second digital signal processing module is: after WCDMA and DCS intermediate-freuqncy signal are passed through the bandpass sampling of A/D respectively; Through digital processing element the digital signal after the A/D sampling is carried out Digital Down Convert (DDC) and multistage low-pass filtering treatment; Wherein the DCS downstream signal is carried out the envelope detection of power; The synchronizing clock signals of obtaining former base station is as the up time division signal of DCS is carried out synchronously; And the power of each data feedback channel detected respectively in real time; When detecting the reference thresholds that signal power surpass to be provided with, then immediately this passage being carried out passage during current time slots opens and handles; Otherwise this passage remains closed condition, and WCDMA and DCS signal, carry out framing and packing and through the Sedes module serial data sent to remote termination through the optical fiber transceiver module data by standard C PRI frame format then to baseband signal through Digital Down Convert;
The signal output link of this first digital signal processing module and second digital signal processing module is: the serial data that the optical fiber transceiver module is received is through the Sedes module and by digital processing element it is carried out CPRI and separate frame and transfer WCDMA and each carrier wave of DCS to baseband signal; Then through Digital Up Convert (DUC) and multistage LPF; WCDMA and each carier restoration of DCS are arrived corresponding frequency; Then carry out the carrier data stack, respectively WCDMA and DCS signal are reduced to intermediate-freuqncy signal through 2 road D/A at last; Wherein, clock generating and distribution module are responsible for to 2 road A/D, 2 road D/A, digital processing element and Sedes module reference clock being provided, and MCU is responsible for each functional unit is carried out data configuration and effective monitoring.
4, the workflow of frequency-variable module.
See also Fig. 5; Be the first decay frequency-variable module, the second decay frequency-variable module and first frequency-variable module of remote termination of near-end machine, the work sketch map of second frequency-variable module, wherein the structure and the operation principle of the first decay frequency-variable module, the second decay frequency-variable module, first frequency-variable module, second frequency-variable module are identical.The structure of the first decay frequency-variable module, the second decay frequency-variable module, first frequency-variable module, second frequency-variable module comprises first dielectric filter, the first high linear mixer, first intermediate frequency amplifier, the first intermediate frequency SAW filter (SAW), second intermediate frequency amplifier, the second intermediate frequency SAW filter, the 3rd intermediate frequency amplifier, the second high linear mixer, second dielectric filter, signal amplifier, the 3rd dielectric filter, CPU respectively, and 2 phase-locked loops.
The down link of this first decay frequency-variable module, the second decay frequency-variable module, first frequency-variable module, second frequency-variable module: the RF signal of DCS and WCDMA is come in the back through after the first dielectric filter filtering; Be down-converted to intermediate-freuqncy signal IF through the first high linear mixer earlier; Intermediate-freuqncy signal is carried out the intermediate frequency filtering processing through the first intermediate frequency SAW filter (SAW) again after first intermediate frequency amplifier amplifies, again the intermediate-freuqncy signal of output DCS and WCDMA after second intermediate frequency amplifier amplifies.
The up link of this first decay frequency-variable module, the second decay frequency-variable module, first frequency-variable module, second frequency-variable module: the intermediate-freuqncy signal IF of DCS and WCDMA carries out intermediate frequency filtering through the second intermediate frequency SAW filter earlier to be handled;, the 3rd intermediate frequency amplifier upconverts to the RF signal through the second high linear mixer again after amplifying; Amplify the last RF signal of exporting DCS and WCDMA again through one the 3rd dielectric filter filtering after the mixing again through the second dielectric filter filtering and signal amplifier.
Wherein phase-locked loop adopts the LMX2531 chip; It is the integrated chip of a VCO+PLL; The clock that its reference clock must adopt digital signal processing module to provide, to guarantee signal Synchronization, the output of 2 phase-locked loops is connected respectively to the first high linear mixer and the second high linear mixer.CPU is responsible for phase-locked loop is locked control mutually.
In sum; The bimodule digital radio frequency stretch system that the present invention is based on software and radio technique is to adopt standard C PRI interface; The powerful FPGA device of language function carries out the digital filtering processing to DCS after the digitlization and WCDMA signal respectively; To far-end, utilize the far end radio frequency extension unit through Optical Fiber Transmission, realize the covering of zooming out of DCS and WCDMA base station signal signal regeneration, amplification.System supports the star-like and 6 grades of chrysanthemum chain networking capabilities of 4 tunnel parallel connections; The carrier capacity that can handle DCS and WCDMA is respectively the carrier number of two-way 8 road 200KHz bandwidth and two-way 3 road 3.84MHz bandwidth; The total bandwidth of each carrier wave is not less than 40MHz; Leave the protection interval of 5MHz between DCS and WCDMA signal; Wherein system possesses noise suppressing function to 8 tunnel up DCS standard signals, effectively resolution system each far-end upward signal problem serious to the noise storage of same sub-district when drags many networkings.
Claims (4)
1. bimodule digital radio frequency stretch system; Comprise near-end machine and remote termination; It is characterized in that: scattered control system DCS and WCDMA base station signal are coupled to the said near-end machine from base transceiver station through coupler respectively; Transmit to the digitized processing of signal and by the signal of standard universal public radio interface CPRI agreement after through system digitlization; DCS and WCDMA base station signal are transferred to the remote termination of each overlay area respectively; Said remote termination is with signal regeneration, amplification; Realize the covering of zooming out of DCS and WCDMA base station signal, said near-end machine comprises a WCDMA dielectric duplexer, a DCS dielectric duplexer, the first decay frequency-variable module that links to each other with a WCDMA dielectric duplexer, second frequency-variable module of decaying that links to each other with a DCS dielectric duplexer, and is connected to first decay first digital signal processing module of frequency-variable module of frequency-variable module and second of decaying; Powerful first power amplifier and first LNA that said remote termination comprises the 2nd WCDMA duplexer, the 2nd DCS duplexer, links to each other respectively with the 2nd WCDMA duplexer; Powerful second power amplifier and second LNA that link to each other respectively with the 2nd DCS duplexer; First frequency-variable module that links to each other with first power amplifier and first LNA, second frequency-variable module that links to each other with second power amplifier and second LNA, and second digital signal processing module that is connected to first frequency-variable module and second frequency-variable module; First digital signal processing module of said near-end machine is connected to second digital signal processing module of remote termination through optical fiber;
The down link of this bimodule digital radio frequency stretch system is: DCS and WCDMA downstream signal are coupled to a WCDMA dielectric duplexer and a DCS dielectric duplexer of near-end machine respectively from the base transceiver station main antenna through coupler; Through first the decay frequency-variable module down-conversion with fading to the WCDMA intermediate-freuqncy signal under the WCDMA signal; Through second the decay frequency-variable module down-conversion with fading to the DCS intermediate-freuqncy signal under the DCS signal; Reach opereating specification but respectively DCS and WCDMA intermediate-freuqncy signal are carried out the A/D bandpass sampling by first digital signal processing module then, be packaged into second digital signal processing module of Serial Data Transfer Mode to remote termination after respectively the DCS after the digitlization and WCDMA intermediate-freuqncy signal being carried out Digital Down Convert and carried out multistage low-pass filtering treatment more again by the CPRI standard frame format; After second digital signal processing module of remote termination is received after the data it is separated frame, configuration by the CPRI agreement; The process Digital Up Convert is also carried out multistage low-pass filtering treatment; Respectively the signal after DCS and the WCDMA digitlization is reverted to intermediate-freuqncy signal by 2 road D/A again; The up-conversion of warp first frequency-variable module is with fading to radiofrequency signal on the WCDMA signal again; The up-conversion of warp second frequency-variable module is with fading to radiofrequency signal on the DCS signal, and the WCDMA radiofrequency signal that recovers is at last amplified, is emitted to the overlay area through the 2nd WCDMA duplexer from retransmitting antenna through first power amplifier respectively; The DCS radiofrequency signal that recovers is at last amplified, is emitted to the overlay area through the 2nd DCS duplexer from retransmitting antenna through second power amplifier;
The up link of this bimodule digital radio frequency stretch system is: the WCDMA upward signal is through after the 2nd WCDMA duplexer Filtering Processing of remote termination; Amplify through first low noise amplifier, the WCDMA signal after the amplification gets into first frequency-variable module with changing to intermediate-freuqncy signal under the WCDMA signal; The DCS upward signal is through after the 2nd DCS duplexer Filtering Processing of remote termination; Amplify through second low noise amplifier; DCS signal after the amplification gets into second frequency-variable module with changing to intermediate-freuqncy signal under the DCS signal; Respectively it is carried out the A/D bandpass sampling by second digital signal processing module then; Again to WCDMA after the digitlization and DCS: intermediate-freuqncy signal is carried out Digital Down Convert and multistage low-pass filtering treatment, wherein the DCS signal is accomplished noise suppressing function and handles, and WCDMA and DCS signal is packaged into first digital signal processing module that transfers to the near-end machine after the serial data by the CPRI standard frame format again; After first digital signal processing module of near-end machine is received after the data it is separated frame, configuration by the CPRI agreement; The process Digital Up Convert is also carried out multistage low-pass filtering treatment; Respectively the signal after WCDMA and the DCS digitlization is reverted to intermediate-freuqncy signal by 2 road D/A again; The up-conversion of the warp first decay frequency-variable module is with fading to radiofrequency signal on the WCDMA signal again; The up-conversion of the warp second decay frequency-variable module is with fading to radiofrequency signal on the DCS signal, at last through through coupler WCDMA and DCS signal being coupled respectively to base transceiver station again after a WCDMA dielectric duplexer, the DCS dielectric duplexer filtering;
The structure and the operation principle of said first digital signal processing module and second digital signal processing module are all identical; Said first digital signal processing module and second digital signal processing module include 2 D/A converter modules, 2 analog-to-digital conversion modules, a digital processing element, a Sedes module, an optical fiber transceiver module, a central control unit MCU; And one clock produce and distribution module; The input of said 2 D/A converter modules is connected respectively to digital processing element; The output of 2 analog-to-digital conversion modules is connected respectively to digital processing element; MCU controls 2 D/A converter modules, 2 analog-to-digital conversion modules, digital processing element, Sedes module simultaneously; And clock generating and distribution module, clock generating and distribution module are respectively 2 D/A converter modules, 2 analog-to-digital conversion modules, digital processing element and Sedes modules provide reference clock;
The signal input link of this first digital signal processing module and second digital signal processing module is: after WCDMA and DCS intermediate-freuqncy signal are passed through the bandpass sampling of analog-to-digital conversion module respectively; Through digital processing element the digital signal after the analog-to-digital conversion module sampling is carried out Digital Down Convert and multistage low-pass filtering treatment; Wherein the DCS downstream signal is carried out the envelope detection of power; The synchronizing clock signals of obtaining former base station is as the up time division signal of DCS is carried out synchronously; And the power of each data feedback channel detected respectively in real time; When detecting the reference thresholds that signal power surpass to be provided with, then immediately this passage being carried out passage during current time slots opens and handles; Otherwise this passage remains closed condition WCDMA and the DCS signal arrives baseband signal through Digital Down Convert, by standard C PRI frame format data is carried out framing and packing and through the Sedes module serial data is sent to remote termination through the optical fiber transceiver module then;
The signal output link of this first digital signal processing module and second digital signal processing module is: the serial data that the optical fiber transceiver module is received is through the Sedes module and by digital processing element it is carried out CPRI and separate frame and transfer WCDMA and each carrier wave of DCS to baseband signal; Then through Digital Up Convert and multistage LPF; WCDMA and each carier restoration of DCS are arrived corresponding frequency; Then carry out the carrier data stack, respectively WCDMA and DCS signal are reduced to intermediate-freuqncy signal through 2 way mould modular converters at last.
2. bimodule digital radio frequency stretch system as claimed in claim 1 is characterized in that: said digital processing element adopts fpga chip.
3. bimodule digital radio frequency stretch system as claimed in claim 1; It is characterized in that: the structure and the operation principle of the first decay frequency-variable module of said near-end machine, first frequency-variable module of second decay frequency-variable module and remote termination, second frequency-variable module are all identical; The structure of the first decay frequency-variable module, the second decay frequency-variable module, first frequency-variable module, second frequency-variable module comprises first dielectric filter, the first high linear mixer, first intermediate frequency amplifier, the first intermediate frequency SAW filter, second intermediate frequency amplifier, the second intermediate frequency SAW filter, the 3rd intermediate frequency amplifier, the second high linear mixer, second dielectric filter, signal amplifier, the 3rd dielectric filter, CPU respectively; And 2 phase-locked loops; The output of said 2 phase-locked loops is connected respectively to the first high linear mixer and the second high linear mixer, and CPU is responsible for phase-locked loop is locked control mutually;
The down link of this first decay frequency-variable module, the second decay frequency-variable module, first frequency-variable module, second frequency-variable module: the RF signal of DCS and WCDMA is come in the back through after the first dielectric filter filtering; Be down-converted to intermediate-freuqncy signal IF through the first high linear mixer earlier; Intermediate-freuqncy signal is carried out the intermediate frequency filtering processing through the first intermediate frequency SAW filter again after first intermediate frequency amplifier amplifies, again the intermediate-freuqncy signal of output DCS and WCDMA after second intermediate frequency amplifier amplifies;
The up link of this first decay frequency-variable module, the second decay frequency-variable module, first frequency-variable module, second frequency-variable module: the intermediate-freuqncy signal IF of DCS and WCDMA carries out intermediate frequency filtering through the second intermediate frequency SAW filter earlier to be handled;, the 3rd intermediate frequency amplifier upconverts to the RF signal through the second high linear mixer again after amplifying; Amplify the last RF signal of exporting DCS and WCDMA again through one the 3rd dielectric filter filtering after the mixing again through the second dielectric filter filtering and signal amplifier.
4. bimodule digital radio frequency stretch system as claimed in claim 3; It is characterized in that: said phase-locked loop adopts the LMX2531 chip; Be the integrated chip of a VCO+PLL, the clock that its reference clock adopts first digital signal processing module or second digital signal processing module to provide.
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| CN104320791A (en) * | 2014-03-04 | 2015-01-28 | 同济大学 | Far-end unit of mobile communication micropower digital multi-point indoor cover system |
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| CN105717501B (en) * | 2016-01-27 | 2018-12-07 | 中国人民解放军国防科学技术大学 | The range-measurement system and its method of optical fiber long distance transmission are directly sampled based on radio frequency |
| CN111629395B (en) * | 2019-02-28 | 2022-06-10 | 大唐移动通信设备有限公司 | Multi-mode communication antenna unit, system and method |
| CN113260096B (en) * | 2021-04-30 | 2022-10-28 | 上海守正通信技术有限公司 | 4G/5G dual-mode distributed base station radio frequency unit system architecture and signal processing method |
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