CN101247162B - TD-SCDMA indoor distribution system simulating intermediate frequency - Google Patents
TD-SCDMA indoor distribution system simulating intermediate frequency Download PDFInfo
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- CN101247162B CN101247162B CN2007100375159A CN200710037515A CN101247162B CN 101247162 B CN101247162 B CN 101247162B CN 2007100375159 A CN2007100375159 A CN 2007100375159A CN 200710037515 A CN200710037515 A CN 200710037515A CN 101247162 B CN101247162 B CN 101247162B
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Abstract
A TD-SCDMA indoor distributed system of analog intermediate frequency includes intermediate frequency access module, intermediate frequency spreading module and radio-frequency module, its character is: process of transmitted signal and ascending receive signal is realized through far connection between intermediate frequency access module, intermediate frequency spreading module and radio-frequency module which are mounted independently; descending intermediate frequency signal accessing intermediate frequency access module receives source executes branch path process, and for synthesizing or partial loading with descending supervisory signal at different circuit which is transmitted to intermediate frequency spreading module; and intermediate frequency spreading module executes gain compensation and branch path spreading for descending signal, far-end radio frequency module is changed to radiofrequency signal through receiving descending signal from intermediate frequency spreading module, and is transmitted by connected antennae; far-end radio frequency module receives ascending signal by antennae, intermediate frequency is transmitted to intermediate frequency spreading module, after ascending signal received by intermediate frequency spreading module is executed with mixing and gain adjusting , ascending signal is transmitted to intermediate frequency access module which mix ascending signal, then analog intermediate frequency signal is transmitted to information source.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of TD-SCDMA indoor distributed system of analog intermediate frequency, belong to a kind of analog intermediate frequency indoor distributed system in the 3G (Third Generation) Moblie.
Background technology
Mobile communication such as GSM, cdma system generally adopt outdoor macro base station to add the mode of directed antenna in the indoor covering of medium and small building, utilize penetrating with the diffraction characteristic of radio wave to cover.The degree of depth that has then adopted indoor distributed antenna to carry out signal in the indoor covering of heavy construction covers; Promptly be assigned to information source on each indoor spaced antenna through low-loss radio frequency cable, passive minute mixer, coupler, when loss of signal is excessive, then compensate loss through trunk amplifier.
But; For the TD-SCDMA 3-G (Generation Three mobile communication system) of application 2 ghz band; Because radio wave diffraction ability and penetration capacity are significantly less than 800MHz and the 900MHz frequency range of GSM, CDMA, the loss of cable is also than GSM and CDMA frequency range high 7 to 8dB etc.If adopt traditional indoor coverage mode, then need increase the power output of trunk amplifier or the number of increase trunk amplifier, thereby increase network construction cost; Simultaneously owing to be subject to indoor distributed system transmission cable and passive deciliter road device, the consistency on the performance that the power output of spaced antenna is difficult to keep good, be easy to generate cover inhomogeneous, have a technical problem such as blind area; And the engineering construction of low loss cable and passive device is also quite complicated, and engineered more, follow-up subregion extended capability is also very poor.In addition; Generally more than 20dB, being positioned at the portable terminal that covers fringe region must will increase system interference with very big transmitting power connecting system to the loss of the spaced antenna of this covering scheme to information source like this; Reduce network capacity, also be unfavorable for user's health simultaneously.And transmit the TD-SCDMA system of a large amount of high-speed data services for needs, because the uplink loss is serious, make covering radius also can obviously reduce.
The indoor distributed system transmission method of the disclosed a kind of many net unifications of Chinese patent document CN1832358A; Be downconverted to intermediate frequency and in radio frequency cable, transmit through closing many nets information source behind the road; The cable far-end receives and is raised to radio frequency through frequency converter behind this signal and exports antenna again to, or antenna receive signal through frequency conversion after the anti-signal source end of delivering to.This method has just solved the indoor distribution signal transmission problem of FDD system, but not how explanation does not solve the transmitting-receiving switching controls of TDD system, unavoidably exists descendingly to up interference problem, for the TD-SCDMA system, does not have feasibility.
Therefore, proposing a kind of indoor distributed system that is applicable to the TD-SCDMA of analog intermediate frequency, has been the pressing issues that equipment manufacturers and operator face; Also be related to one of key issue that can the TD-SCDMA 3-G (Generation Three mobile communication system) come into the market smoothly.
Summary of the invention
The object of the invention: aim to provide the indoor covering scheme of a kind of TD-SCDMA cheaply; Not only reduce the installation cost of indoor distributed system, the carrier wave recovery problem in the solution TDD system; And directly cover compartment system through far-end RF module, not only help user's health but also can improve the uniformity that signal covers.
The objective of the invention is to realize through following technical scheme:
The TD-SCDMA indoor distributed system of this analog intermediate frequency comprises intermediate frequency AM access module, intermediate frequency expansion module and far-end RF module, it is characterized in that:
Zoom out connection between intermediate frequency AM access module, intermediate frequency expansion module and the far-end RF module of A, independent setting separately, realize TD-SCDMA downlink Signal Processing and up reception Signal Processing.
B, described intermediate frequency AM access module receive the descending intermediate-freuqncy signal of TD-SCDMA information source and carry out the shunt processing, and are used for synthetic with descending pilot signal or are carried on different circuits respectively being transferred to the intermediate frequency expansion module; And by the intermediate frequency expansion module to carry out gain compensation and further along separate routes expansion from the descending intermediate-freuqncy signal of intermediate frequency AM access module; Far-end RF module is that radiofrequency signal is launched through the antenna that is attached thereto through descending intermediate-freuqncy signal and the frequency conversion that receives from the intermediate frequency expansion module, forms downlink Signal Processing path; Simultaneously far-end RF module is received up radiofrequency signal and is down-converted to intermediate frequency through antenna and send to the intermediate frequency expansion module; The intermediate frequency expansion module closes the upward signal that receives and sends to intermediate frequency AM access module after the road is adjusted with gain; Intermediate frequency AM access module is closed the road to the upward signal from the intermediate frequency expansion module; The analog if signal that closes behind the road sends information source to, forms up reception signal processing path.
Described intermediate frequency AM access module is adopted being connected of point-to-multipoint with each intermediate frequency expansion module that one group of intermediate frequency expansion module is comprised, and the far-end RF module that described each group far end radio-frequency module is comprised adopts how point-to-point the connection with the intermediate frequency expansion module.
Zoom out through the wire transmission media between described intermediate frequency AM access module and the intermediate frequency expansion module and be connected, described wire transmission media comprises optical fiber, arrowband coaxial cable.
Zoom out through wired transmission medium between described intermediate frequency expansion module and the far-end RF module and be connected, described wire transmission media comprises Ethernet cable and arrowband coaxial cable.
Also comprise a TD-SCDMA clock recovery module in described intermediate frequency AM access module or the intermediate frequency expansion module; Obtain TD-SCDMA frame synchronizing signal and reference clock through the descending intermediate-freuqncy signal of demodulation; Frame synchronizing signal is that indoor distributed system provides TDD transmitting-receiving switching controls, and reference clock is that far-end RF module provides reference clock.
Described intermediate frequency AM access module or intermediate frequency expansion module also comprise a power distribution module that remote power feeding is provided for far-end RF module.
Described intermediate frequency AM access module comprises modules such as FSK modulating/demodulating and the uplink and downlink duplexer of IF switch, uplink and downlink gain controlling, middle frequency division, mixer, microcontroller, pilot signal, when adopting optical fiber to be connected with the intermediate frequency expansion module, also comprises optical transceiver module; On wherein time-multiplexed/descending analog if signal 4 and information source link to each other with IF switch 5 in the intermediate frequency AM access module; Descending analog if signal is selected to link to each other with descending gain control module through IF switch; Gain adjustment back is synthetic with the descending pilot signal frequency division multiplexing in descending duplexer through the FSK debugging from the output of FSK modulator/demodulator; Descending duplexer is connected with splitter; Splitter is divided into four the tunnel with synthetic signal, and is transferred to the intermediate frequency expansion module that is attached thereto through the arrowband coaxial cable respectively; When intermediate frequency AM access module and intermediate frequency expansion module adopted narrow band fiber to be connected, four road signals converted light signal into through four optical transceiver modules respectively and in narrow band fiber, transmit; Intermediate frequency AM access module is coaxial cable or receive the up pilot signal of up analog if signal from the frequency division multiplexing of each intermediate frequency expansion module through narrow band fiber through optical transceiver module through the arrowband; In mixer, close the road; Mixer links to each other with the uplink dual multiplexer, and in duplexer, multiplexing signal is broken down into the up pilot signal and the up analog if signal of FSK modulation in duplexer; Wherein the up pilot signal of FSK modulation links to each other with the FSK modulator/demodulator; Up analog if signal links to each other with up gain control module, after the gain adjustment, is connected with IF switch 5, carries out up-downgoing analog if signal time division multiplexing through IF switch; Pilot signal 7 is connected with microcontroller with information source, and microcontroller links to each other with the FSK modulator/demodulator, on the one hand the system descending pilot signal is sent to the FSK modulator/demodulator to modulate, and receives the up pilot signal after this module demodulation on the other hand.
Described intermediate frequency expansion module comprises the FSK de/modulation device, power module, microcontroller of loss compensation, uplink and downlink gain controlling, the pilot signal of uplink and downlink duplexer, intermediate frequency, reaches clock recovery module synchronously; Up mixer, power supply/clock/synchronizing signal splitter and a plurality of adaptor module also comprise optical transceiver module when adopting narrow band fiber to be connected with intermediate frequency AM access module; Wherein coaxial cable is connected with descending duplexer through the arrowband from the descending composite signal of intermediate frequency AM access module; When intermediate frequency AM access module and intermediate frequency expansion module adopt narrow band fiber to be connected; After the optical transceiver module conversion, be connected with descending duplexer; The descending pilot signal of the FSK modulation that descending diplexer separates goes out is connected with the FSK modulator/demodulator; Isolated descending analog if signal is connected with synchronous and clock recovery unit with the loss compensating module respectively; Getting into descending gain control module through the descending analog if signal of loss compensation gains and is connected to power supply, clock, sub-signal road device synchronously after the adjustment; Synchronously and the clock recovery unit from descending analog if signal, extracts TD-SCDMA synchronizing signal and reference clock and is connected to power supply, clock, sub-signal road device synchronously, outside 220V AC or-the 48VDC power supply is connected to power module, produce far-end RF module need power supply also be connected to power supply, clock, synchronous sub-signal road device; Power supply, clock, synchronous sub-signal road device respectively are divided into octuple to power supply, descending analog if signal, reference clock, synchronizing signal, and are connected respectively in the adapter of each self-configuring; Each adapter also is connected with mixer; The up analog if signal that each adapter receives from ethernet line 2 closes mixer and is connected to the adjustment that gains of up gain control module behind the road; And be connected with the uplink dual multiplexer; In the uplink dual multiplexer, carry out frequency division multiplexing with up pilot signal from the FSK modulator/demodulator, be transferred to intermediate frequency AM access module through the arrowband coaxial cable; When adopting narrow band fiber to connect, must convert behind the light signal intermediate frequency AM access module into through optical transceiver module through the narrow band fiber transmission; Microcontroller also links to each other with each adapter; Receive and the uplink and downlink pilot signal that sends far-end RF module; Microcontroller also links to each other with the FSK modulator/demodulator, receive with send power supply that each adapter that descending and up pilot signal to this intermediate frequency expansion module has the identical functions structure is connected to adapter, reference clock, on/each differential lines centering that descending analog if signal, pilot signal, synchronizing signal synthesize or be carried on respectively ethernet line.
Described far-end RF module comprises parts such as the compensation of intermediate frequency loss, power module, duplexer, IF switch, uplink and downlink gain controlling, local oscillator, upper and lower frequency converter, descending power control module and power amplifier, low noise amplifier, RF switch, antenna filter, when supporting a plurality of antennas also to comprise a branch mixer when connecting; Its ethernet line 2 that is connected with the intermediate frequency expansion module is connected to far-end RF module through the RJ45 interface, and wherein pilot signal is connected with control unit with synchronous signal line, after control unit inside is to above-mentioned signal processing, realizes the relevant control of far-end RF module; Power supply, clock, on/descending analog if signal line links to each other with the loss module with power module respectively; Power module extracts power supply signal from circuit; For whole far-end RF module provides power supply, the cable transmission loss of loss module for compensating signal, and be connected with duplexer; Diplexer separates goes out clock signal and is connected with the local oscillator module, and for the local oscillator module provides reference clock, duplexer is also isolated analog if signal and is connected with IF switch 5; Switch is isolated time-multiplexed descending, up analog if signal through synchronizing signal control, and links to each other with up gain control module with descending gain control module respectively; The descending analog if signal of descending gain control module output is connected to upconverter; Convert into through upconverter and to be connected to descending power control and power amplifier module behind the downlink radio-frequency signal; This module controls down transmitting power, and be connected to RF switch 9, RF switch 9 receives synchronizing signal control to receive and dispatch switching; Send downlink radio-frequency signal to radio-frequency filter 10; Be connected to antenna 3 after the filtering and launch, when being connected to a plurality of antenna, radio-frequency filter 10 must be connected with antenna through dividing mixer; Antenna 3 also receives up radiofrequency signal; Through minute mixer or be directly connected to radio-frequency filter; Be connected to low noise amplifier through RF switch 9 after the filtering and carry out the signal amplification; And be connected with low-converter 11, in low-converter 11, convert into and be connected to the adjustment that gains of up gain control module behind the up analog if signal, export analog intermediate frequency switch 5 at last to; The local oscillator module also connects with upper and lower frequency converter 8,11 respectively, for upper and lower frequency conversion provides the RF local oscillator that is locked in reference clock signal.
This system comprises an intermediate frequency expansion module and a group far end radio-frequency module; Described intermediate frequency expansion module through one group of wired transmission medium with each independently far-end RF module be connected; The wire transmission media can be that Ethernet cable also can be a coaxial cable, time-multiplexed on/descending intermediate-freuqncy signal, pilot signal, reference clock, frame synchronizing signal and power supply is synthetic or carry with in each connection line respectively.
At this moment, described intermediate frequency AM access module is adopted being connected of point-to-multipoint with each radio-frequency module that a group far end radio-frequency module is comprised.
Above-mentioned TD-SCDMA indoor distributed system, described radiofrequency signal frequency range is 1880MHz～1920MHz, 2010～2015MHz and 2300～2400MHz.
Above-mentioned TD-SCDMA indoor distributed system, its frequency of described intermediate-freuqncy signal is between 50MHz～190MHz.
The TD-SCDMA indoor distributed system of this analog intermediate frequency is proposed according to above technical scheme; Through the analog if signal of TD-SCDMA with pilot signal, reference clock, frame synchronizing signal through narrow band fiber, coaxial cable or the indoor covering of ethernet line transmission carrying out cheaply; Reduced the construction cost of indoor covering, the destruction of having reduced aspect the network construction to building.Through from downstream signal, extracting frame synchronizing signal and reference clock, the transmitting-receiving switching controls and the carrier wave in the conversion process that have solved the TDD system recover problem simultaneously, and the system that makes need not provide independent synchronizing signal and reference clock from information source.Further meaning of the present invention is; Through far-end each independently the adjustable radio-frequency module of power output directly cover; Greatly reduce the uplink transmission power that accesses terminal on the one hand; Help improving power system capacity and user's health, improved the uniformity that signal covers on the other hand, make things convenient for the network planning of indoor distributed system.
Description of drawings
Fig. 1 is the structural representation of indoor distributed system of the present invention;
Fig. 2 constitutes sketch map for intermediate frequency AM access module;
Fig. 3 constitutes sketch map for the intermediate frequency expansion module;
Fig. 4 constitutes sketch map for far-end RF module;
Indoor distribution during accompanying drawing 5 practical application of the present invention connects sketch map;
Accompanying drawing 6 is ethernet line transmission sketch map;
Accompanying drawing 7 is an another kind of structural representation of the present invention;
Accompanying drawing 8 is that traditional TD-SCDMA indoor distributed system is used sketch map.
Among the figure: on 1-arrowband coaxial cable or the optical fiber 2-ethernet line 3-antenna 4-/descending analog if signal 5-IF switch 6-optical fiber/coaxial cable 7-pilot signal 8-upconverter 9-RF switch 10-antenna filter 11-low-converter 12-arrowband, arrowband coaxial cable 13-optical fiber 14-coupler 15-power splitter 16-trunk amplifier 17-low-loss radio frequency cable 18-reveals cable
Embodiment
Core of the present invention is to adopt the analog intermediate frequency transmission means to realize the indoor covering of TD-SCDMA signal; Through from downstream signal, extracting the mode of frame synchronization and reference clock; Solve the problem of TD-SCDMA indoor distributed system TDD transmitting-receiving switching controls and carrier synchronization; And system business signal, reference clock, pilot signal realized transmission with the mode of frequency division multiplexing in an arrowband coaxial cable or two fibre circuits; Then transmit all signals that comprise power supply signal at far-end, reduced the covering cost with single ethernet line.
TD-SCDMA indoor distributed system of the present invention is the Distributed Active Antennas system, and concrete structure is as shown in Figure 1, comprising:
The TD-SCDMA information source: indoor little base station or repeater for indoor distributed system provides descending analog if signal, receive the up analog if signal from the indoor distributed system of intermediate frequency AM access module.
Intermediate frequency AM access module: carry out the transmission of up-downgoing analog if signal through single arrowband coaxial cable time division multiplexing or a pair of arrowband coaxial cable and information source; Link to each other modules such as this module comprises that the gain adjustment, intermediate frequency deciliter road, transmit-receive switch of intermediate-freuqncy signal are switched, the FSK modulating/demodulating of pilot signal and duplexer with the intermediate frequency expansion module through narrow band fiber or arrowband coaxial cable.When directly linking to each other, comprise that also frame synchronization is extracted and reference clock recovers module with radio-frequency module.
Intermediate frequency expansion module (IHU): link to each other with intermediate frequency AM access module through arrowband coaxial cable or optical fiber; Receive and transmission up-downgoing analog if signal and pilot signal; And is connected with radio-frequency module through ethernet line, this module comprises that intermediate frequency loss compensation AGC amplifier, intermediate frequency divide that mixer, transmit-receive switch switch, the FSK de/modulation device of pilot signal, duplexer, power distribution module and frame synchronization extraction and reference clock recovery module.
Radio-frequency module (IAU): link to each other with the intermediate frequency expansion module through ethernet line; Receive and transmission up-downgoing analog if signal, pilot signal, frame synchronizing signal, reference clock and power supply, and pass through 1 to 4 antenna transmitting downstream radiofrequency signal and receive up radiofrequency signal.This module comprises intermediate frequency loss compensation AGC, local oscillator, goes up parts such as down conversion module, descending power control module and power amplifier, low noise amplifier, and the transmitting-receiving that is used for radiofrequency signal is handled.
The TD-SCDMA indoor distributed system of this analog intermediate frequency comprises intermediate frequency AM access module, intermediate frequency expansion module and radio-frequency module, it is characterized in that:
Zoom out connection between intermediate frequency AM access module, intermediate frequency expansion module and the radio-frequency module of A, independent setting separately, realize TD-SCDMA downlink Signal Processing and up reception Signal Processing.
B, described intermediate frequency AM access module receive the descending intermediate-freuqncy signal of information source and carry out the shunt processing, and are used for synthetic with descending pilot signal or are carried on different circuits respectively being transferred to the intermediate frequency expansion module; And by the intermediate frequency expansion module to carry out gain compensation and further along separate routes expansion from the descending intermediate-freuqncy signal of intermediate frequency AM access module; Far-end RF module is that radiofrequency signal is launched through the antenna that is attached thereto through descending intermediate-freuqncy signal and the frequency conversion that receives from the intermediate frequency expansion module, forms downlink Signal Processing path; Simultaneously far-end RF module is received up radiofrequency signal and is down-converted to intermediate frequency through antenna and send to the intermediate frequency expansion module; The intermediate frequency expansion module closes the upward signal that receives and sends to intermediate frequency AM access module after the road is adjusted with gain; Intermediate frequency AM access module is closed the road to the upward signal from the intermediate frequency expansion module; The analog if signal that closes behind the road sends information source to, forms up reception signal processing path.
Described intermediate frequency AM access module is adopted being connected of point-to-multipoint with each intermediate frequency expansion module that one group of intermediate frequency expansion module is comprised, and the radio-frequency module that described each group far end radio-frequency module is comprised adopts how point-to-point the connection with the intermediate frequency expansion module.
Zoom out through the wire transmission media between described intermediate frequency AM access module and the intermediate frequency expansion module and be connected, described wire transmission media comprises narrow band fiber, arrowband coaxial cable.
Zoom out through wired transmission medium between described intermediate frequency expansion module and the far-end RF module and be connected, described wire transmission media comprises Ethernet cable and arrowband coaxial cable.
Also comprise a TD-SCDMA clock recovery module in described intermediate frequency AM access module or the intermediate frequency expansion module; Obtain TD-SCDMA frame synchronizing signal and reference clock through the descending intermediate-freuqncy signal of demodulation; Frame synchronizing signal is that indoor distributed system provides TDD transmitting-receiving switching controls, and reference clock is that far-end RF module provides reference clock.
Described intermediate frequency AM access module or intermediate frequency expansion module also comprise a power distribution module, for far-end RF module provides remote power feeding.
Also comprise the down transmitting power controlled function in the described far-end RF module, be used to adjust down transmitting power.
As the improvement of above-mentioned basic scheme, the present invention provides another kind of TD-SCDMA indoor distributed system, comprises an intermediate frequency AM access module, one group of intermediate frequency expansion module and many group far ends radio-frequency module; Each intermediate frequency expansion module independently that a described intermediate frequency AM access module is connected to that one group of intermediate frequency expansion module comprises through one group of circuit, time-multiplexed on/descending intermediate-freuqncy signal, pilot signal, reference clock and frame synchronizing signal be carried on respectively in each connection line with the mode of frequency division multiplexing; Described each intermediate frequency expansion module is connected with each group radio-frequency module through one group of transmission line respectively, time-multiplexed on/descending intermediate-freuqncy signal, pilot signal, reference clock, frame synchronizing signal and power supply is synthetic or carrying and in each connection line respectively.
At this moment; Described intermediate frequency AM access module is adopted being connected of point-to-multipoint with each intermediate frequency expansion module that one group of intermediate frequency expansion module is comprised, and described each intermediate frequency expansion module adopts being connected of point-to-multipoint with each radio-frequency module that each group far end radio-frequency module is comprised respectively.
Another improvement as above-mentioned basic scheme; The present invention also provides a kind of TD-SCDMA indoor distributed system; Comprise an intermediate frequency expansion module and a group far end radio-frequency module; Described intermediate frequency expansion module through one group of wired transmission medium and far-end each independently radio-frequency module be connected; The wire transmission media can be that Ethernet cable also can be the arrowband coaxial cable, time-multiplexed on/descending intermediate-freuqncy signal, pilot signal, reference clock, frame synchronizing signal and power supply is synthetic or carry with in each connection line respectively.
At this moment, described intermediate frequency AM access module is adopted being connected of point-to-multipoint with each radio-frequency module that a group far end radio-frequency module is comprised.
Above-mentioned TD-SCDMA indoor distributed system, described radiofrequency signal frequency range is 1880MHz～1920MHz, 2010～2015MHz and 2300～2400MHz.
Above-mentioned TD-SCDMA indoor distributed system, its frequency of described intermediate-freuqncy signal is between 50MHz～190MHz.
Approximately can to cover 1～3 layer, radius according to the structure of actual building be 20～50 meters scope to the coverage of each radio-frequency module in the foregoing invention.
Typical application of the present invention is as shown in Figure 1, and its basic functional principle is:
Intermediate frequency AM access module is used to accomplish indoor distributed system and deciliter road of the intermediate-freuqncy signal that is connected, is connected to intermediate frequency expansion module (IHU) of information source (indoor base station) and the monitoring of interface processing and system, and pilot signal that transmits between intermediate frequency AM access module and the IHU and up-downgoing intermediate-freuqncy signal adopt the mode of frequency division multiplexing to be connected through transmitting-receiving a pair of arrowband cable or optical fiber; Also can connect through an arrowband coaxial cable, up-downgoing this moment analog if signal adopts time-multiplexed mode.Intermediate frequency AM access module has the interface of 4 IHU at most, allows maximum 4 IHU to insert.
IHU carries out the loss compensation to the descending analog if signal that receives from intermediate frequency AM access module; From signal, extract frame synchronizing signal and reference clock, and be distributed to the far-end RF module (IAU) that inserts IHU through ethernet line with the power supply signal that the power distribution module produces; IHU also receives from the up analog if signal of IAU and closes the road and is transmitted to intermediate frequency AM access module with gain adjustment back with up pilot signal; IHU has 8 IAU interfaces at most, allows maximum 8 IAU to insert.
Fig. 5 be IHU with IAU between adopt ethernet line to be connected signal transmit example; Wherein power supply, clock and uplink and downlink intermediate-freuqncy signal are multiplexed in a pair of netting twine; Pilot signal uses a pair of netting twine with the half-duplex mode of RS-485, and frame synchronizing signal or transmitting-receiving switching signal use a pair of netting twine to transmit with the RS-485 mode.
Far-end RF module is realized the transmitting-receiving of wireless signal; Wherein low noise amplifier, down-conversion mould device are accomplished the reception and the frequency conversion of up-link wireless signal; Up-conversion mould device and power amplifier are accomplished frequency conversion and the power amplification of descending intermediate-freuqncy signal and are launched through built-in aerial or 1 to 4 external antenna, to increase area coverage.Loss compensates and to the adjustment that gains of up-downgoing intermediate-freuqncy signal inner gain control module to cable transmission; The local oscillator module realizes carrier synchronization and for upper and lower frequency converter signal source is provided that the descending power control module is set down transmitting power as required according to reference clock.
Above-mentioned indoor distributed system carries out oam through intermediate frequency AM access module, promptly realizes monitoring, fault detect and the operating frequency configuration and the power control etc. of power supply, has greatly made things convenient for the centralized management and the maintenance of system.
The present invention is based on above-mentioned operation principle, an intermediate frequency AM access module maximum can connect the indoor covering that 32 far-end RF modules are realized the TD-SCDMA signal.The far-end RF module that can certainly connect proper number according to the needs of area coverage.
Convenient for installation application, the structure that intermediate frequency AM access module of the present invention and intermediate frequency expansion module are designed to standard places in the rack of information source such as little base station, also can adopt other mounting meanss such as wall hanging.
Far-end RF module among the present invention adopts the design of miniaturization, and it is interior Anywhere that distribution is installed on the building that needs covering, only need link to each other with the intermediate frequency expansion module by 1 netting twine.
The present invention is an interface with the analog intermediate frequency information source; Adopt that narrowband intermediate frequency cable and ethernet line are realized indoor covering cheaply; Relatively with radio frequency coaxial-cable, installation is all very convenient, and the while has also been saved the radio frequency and the high power circuit of information source end; Extraction and transmission problem that transmitting-receiving is switched have been solved, for the indoor covering of TD-SCDMA provides good solution.
The present invention has solved the clock and the synchronizing signal transmission problem of TD-SCDMA intermediate frequency indoor distributed system simultaneously owing to adopt narrow band transmission media cheaply to reduce the cost of TD-SCDMA indoor distributed system.
Above-described TD-SCDMA indoor distributed system instance is merely an embodiment of the present invention, but protection scope of the present invention is not limited thereto.
Claims (13)
1. the TD-SCDMA indoor distributed system of an analog intermediate frequency comprises intermediate frequency AM access module, intermediate frequency expansion module and far-end RF module, it is characterized in that:
Zoom out connection between intermediate frequency AM access module, intermediate frequency expansion module and the far-end RF module of A, independent setting separately, realize TD-SCDMA downlink Signal Processing and up reception Signal Processing;
B, described intermediate frequency AM access module receive the descending intermediate-freuqncy signal of TD-SCDMA information source and carry out the shunt processing, and are used for synthetic with descending pilot signal or are carried on different circuits respectively being transferred to the intermediate frequency expansion module; And by the intermediate frequency expansion module to carry out gain compensation and further along separate routes expansion from the descending intermediate-freuqncy signal of intermediate frequency AM access module; Far-end RF module is that radiofrequency signal is launched through the antenna that is attached thereto through descending intermediate-freuqncy signal and the frequency conversion that receives from the intermediate frequency expansion module, forms downlink Signal Processing path; Described far-end RF module receives up radiofrequency signal and is down-converted to intermediate frequency through antenna and sends to the intermediate frequency expansion module simultaneously; The intermediate frequency expansion module closes the upward signal that receives and sends to intermediate frequency AM access module after the road is adjusted with gain; Intermediate frequency AM access module is closed the road to the upward signal from the intermediate frequency expansion module; The analog if signal that closes behind the road sends information source to, forms up reception signal processing path.
2. the TD-SCDMA indoor distributed system of a kind of analog intermediate frequency as claimed in claim 1; It is characterized in that: described intermediate frequency AM access module is adopted being connected of point-to-multipoint with each intermediate frequency expansion module that one group of intermediate frequency expansion module is comprised, and described each intermediate frequency expansion module adopts being connected of point-to-multipoint with each far-end RF module that each group far end radio-frequency module is comprised respectively.
3. the TD-SCDMA indoor distributed system of a kind of analog intermediate frequency as claimed in claim 1; It is characterized in that: zoom out through the wire transmission media between described intermediate frequency AM access module and the intermediate frequency expansion module and be connected, described wire transmission media comprises narrow band fiber, arrowband coaxial cable.
4. the TD-SCDMA indoor distributed system of a kind of analog intermediate frequency as claimed in claim 1; It is characterized in that: zoom out through wired transmission medium between described intermediate frequency expansion module and the radio-frequency module and be connected, described wire transmission media comprises Ethernet cable and arrowband coaxial cable.
5. the TD-SCDMA indoor distributed system of a kind of analog intermediate frequency as claimed in claim 1; It is characterized in that: also comprise a TD-SCDMA clock recovery module in described intermediate frequency AM access module or the intermediate frequency expansion module; Obtain TD-SCDMA frame synchronizing signal and reference clock through the descending intermediate-freuqncy signal of demodulation; Frame synchronizing signal is that indoor distributed system provides TDD transmitting-receiving switching controls, and reference clock is that radio-frequency module provides reference clock.
6. the TD-SCDMA indoor distributed system of a kind of analog intermediate frequency as claimed in claim 1, it is characterized in that: described intermediate frequency AM access module or intermediate frequency expansion module also comprise a power distribution module that remote power feeding is provided for the radio-frequency module of far-end.
7. the TD-SCDMA indoor distributed system of a kind of analog intermediate frequency as claimed in claim 1; It is characterized in that: described intermediate frequency AM access module comprises the FSK modulator/demodulator and the uplink and downlink duplexer module of IF switch, uplink and downlink gain controlling, middle frequency division, mixer, microcontroller, pilot signal, when adopting optical fiber to be connected with the intermediate frequency expansion module, also comprises optical transceiver module; Wherein, IF switch (5) is connected with descending gain control module and up gain control module, on time-multiplexed/descending analog if signal (4) switches, descending gain control module is carried out gain controlling to descending intermediate-freuqncy signal; Descending gain control module is connected with descending duplexer respectively with the FSK modulator/demodulator; The fsk modulated signal of the descending analog if signal of descending gain control module output and the output of FSK modulator/demodulator closes the downstream signal of road output frequency division multiplexing in descending duplexer; Descending duplexer is connected with splitter; The downstream signal of frequency division multiplexing is divided into four the tunnel through splitter, and is transferred to the intermediate frequency expansion module that is attached thereto through arrowband coaxial cable (6) respectively; When intermediate frequency AM access module and intermediate frequency expansion module adopted narrow band fiber to be connected, four road signals converted light signal into through four optical transceiver modules respectively and in narrow band fiber (6), transmit; Also coaxial cable or optical transceiver module receive the upward signal from the frequency division multiplexing of each intermediate frequency expansion module output through the arrowband in intermediate frequency AM access module.Optical transceiver module or arrowband cable are connected with splitter with mixer respectively; Mixer and uplink dual multiplexer downlink connection; The uplink dual multiplexer is isolated fsk modulated signal and up analog if signal from upward signal; The FSK modulator/demodulator is connected with the uplink dual multiplexer respectively with up gain control module, and the FSK modulator/demodulator demodulates up pilot signal, and up gain control module is adjusted the gain of up analog if signal; Pilot signal (7) is connected with microcontroller with information source; Microcontroller links to each other with the FSK modulator/demodulator; Microcontroller on the one hand sends to the FSK modulator/demodulator with the system descending pilot signal and modulates, and receives the up pilot signal after this module demodulation on the other hand.
8. the TD-SCDMA indoor distributed system of a kind of analog intermediate frequency as claimed in claim 1; It is characterized in that: described intermediate frequency expansion module comprises the FSK de/modulation device, power module, microcontroller of loss compensating module, uplink and downlink gain control module, the pilot signal of uplink and downlink duplexer, intermediate frequency, reaches clock recovery module synchronously; Up combiner, power supply/clock/synchronizing signal shunt and a plurality of adaptor module also comprise optical transceiver module when adopting narrow band fiber to be connected with intermediate frequency AM access module; Wherein coaxial cable (6) exports descending duplexer to through the arrowband from the downstream signal of intermediate frequency AM access module; When intermediate frequency AM access module and intermediate frequency expansion module adopt narrow band fiber to be connected; Downstream signal exports descending duplexer to after the optical transceiver module conversion; Descending duplexer respectively with the loss compensating module, reach the clock recovery unit synchronously and be connected with the FSK modulator/demodulator; Descending diplexer separates goes out the descending analog if signal and the fsk modulated signal of frequency division multiplexing; The loss compensating module compensates the cable/fiber transmission attenuation of descending analog if signal, reaches the clock recovery unit synchronously and from descending analog if signal, extracts TD-SCDMA synchronizing signal and reference clock, and the FSK modulator/demodulator demodulates descending pilot signal and exports micro controller module to from fsk modulated signal; Descending gain control module is connected with the loss compensating module, is used to adjust the level of descending analog if signal; Power module with 220V AC or-48V DC power supply is converted to the needed voltage of far-end RF module; Power supply, the synchronous shunt of clock are respectively with power module, descending gain control module with reach the clock recovery unit synchronously and be connected; Power supply, descending analog if signal, reference clock, synchronizing signal respectively are divided into octuple; And output to respectively in each adapter, and transfer to far-end RF module by the ethernet line (2) that is connected to each adapter; Each adapter also is connected with combiner with microcontroller; Microcontroller is connected with the FSK modulator/demodulator; Adapter receives up analog if signal and up pilot signal from each far-end RF module from ethernet line (2); Up analog if signal closes the road in combiner, export FSK modulator/demodulator module after up pilot signal is encoded to and carry out the FSK modulation in microcontroller; Described combiner is connected with up gain control module, closes the adjustment that in up gain control module, gains of up analog if signal behind the road; Described FSK modulator/demodulator and up gain control module be connected with the uplink dual multiplexer respectively, the up pilot signal of adjusted up analog if signal and the FSK modulation that gains is carried on behind the frequency division multiplexing in the uplink dual multiplexer and is back to intermediate frequency AM access module in the arrowband coaxial cable; When adopting narrow band fiber to connect, must be converted to behind the optical signal intermediate frequency AM access module by optical transceiver module by the narrow band fiber transmission.
9. the TD-SCDMA indoor distributed system of a kind of analog intermediate frequency as claimed in claim 1; It is characterized in that: described radio-frequency module comprises intermediate frequency loss compensating module, power module, duplexer, IF switch, uplink and downlink gain controlling, local oscillator, upper and lower frequency converter, descending power control module and power amplifier, low noise amplifier, RF switch, antenna filter, when supporting a plurality of antennas also to comprise a branch mixer when connecting; Far-end RF module is connected through ethernet line (2) with the intermediate frequency expansion module; The ethernet line that wherein carries pilot signal and synchronizing signal is connected with control unit through RJ45, and control unit is handled the back to pilot signal and synchronizing signal and realized the relevant control of radio-frequency module; Carry power supply, clock, on/ethernet line of descending analog if signal links to each other with the loss module with power module respectively through RJ45; Power module is extracted as the power supply of whole radio-frequency module power supply from circuit; Loss module for compensating clock, on/the cable transmission loss of descending analog if signal, and be connected with duplexer; Duplexer is connected with IF switch (5) local oscillator module respectively, and diplexer separates goes out clock signal and exports the local oscillator module to, isolates descending analog if signal and exports IF switch to; Described IF switch is connected with the uplink and downlink gain control module respectively; Descending gain control module is connected with upconverter (8), and upconverter also is connected with descending power control and power amplifier module with the local oscillator module, and descending power control and power amplifier module are connected to RF switch (9); RF switch is connected to radio-frequency filter (10); Radio-frequency filter is connected to antenna (3), when connecting a plurality of antenna, when radio-frequency filter must be connected with antenna through dividing mixer; Descending analog if signal is launched through antenna through converting radiofrequency signal into after the above-mentioned module; Antenna also receives up radiofrequency signal and through minute mixer or directly get into radio-frequency filter; After the filtering through exporting RF switch to; RF switch is connected with low noise amplifier, and low noise amplifier is connected with low-converter (11), and low-converter is connected with up gain control module with local oscillator; Up gain control module is connected with IF switch, and the local oscillator module is that upper and lower frequency converter provides the RF local oscillator that is locked in reference clock signal.
10. the TD-SCDMA indoor distributed system of a kind of analog intermediate frequency as claimed in claim 1; It is characterized in that: this system comprises an intermediate frequency expansion module and one group of radio-frequency module; Described intermediate frequency expansion module through one group of wired transmission medium and far-end each independently radio-frequency module be connected; The wire transmission media can be that Ethernet cable also can be a coaxial cable; On time-multiplexed/descending intermediate-freuqncy signal, pilot signal, reference clock, frame synchronizing signal carry with the wire transmission media in transmit, each independently radio-frequency module through intermediate frequency expansion module remote power feeding.
11. the TD-SCDMA indoor distributed system of a kind of analog intermediate frequency as claimed in claim 10 is characterized in that: the radio-frequency module that is comprised in described intermediate frequency AM access module and the one group of radio-frequency module adopts being connected of point-to-multipoint.
12. the TD-SCDMA indoor distributed system of a kind of analog intermediate frequency as claimed in claim 1 is characterized in that: described radiofrequency signal frequency range is 1880MHz～1920MHz, 2010～2015MHz and 2300～2400MHz.
13. the TD-SCDMA indoor distributed system of a kind of analog intermediate frequency as claimed in claim 1 is characterized in that: above-mentioned TD-SCDMA indoor distributed system, its frequency of described intermediate-freuqncy signal is between 50MHz～190MHz.
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| CN101247162B true CN101247162B (en) | 2012-04-25 |
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| CN102098688A (en) * | 2009-12-09 | 2011-06-15 | 中国移动通信集团公司 | Method, system and device for realizing MIMO (multiple input multiple output) of indoor distribution system |
| CN102842017B (en) * | 2012-07-10 | 2015-10-28 | 深圳市捷顺科技实业股份有限公司 | A kind of extended method of read head, device and system |
| CN103379674B (en) * | 2013-07-24 | 2016-04-20 | 三维通信股份有限公司 | A kind of multimode numeral DAS system supporting multiple source to access |
| KR102238709B1 (en) * | 2014-09-12 | 2021-04-12 | 삼성전자주식회사 | Radio frequency processing apparatus and method |
| CN104796974B (en) * | 2015-03-10 | 2018-03-13 | 浙江金天地通讯工程有限公司 | Multi-service compartment system and system gain control method based on ROF technologies |
| CN105450237B (en) * | 2015-11-11 | 2018-10-12 | 中国电子科技集团公司第四十一研究所 | A kind of digital intermediate frequency dynamic rage extension method |
| TWI664869B (en) * | 2017-06-09 | 2019-07-01 | 翌勤通訊股份有限公司 | Distributed Communication Method and System Thereof |
| US20220158857A1 (en) * | 2019-03-20 | 2022-05-19 | Commscope Technologies Llc | Systems and methods for infrastructure management system based power sourcing equipment power allocation |
| CN111934698B (en) * | 2019-05-13 | 2021-12-03 | 大唐移动通信设备有限公司 | Radio frequency signal receiving method, radio frequency signal sending method and device |
| CN116647853B (en) * | 2023-07-26 | 2023-09-22 | 赛尔通信服务技术股份有限公司 | DAS end passive device for enhancing 5G signal power |
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