CN101247162A - TD-SCDMA indoor distribution system simulating intermediate frequency - Google Patents
TD-SCDMA indoor distribution system simulating intermediate frequency Download PDFInfo
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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 information source is assigned on each indoor spaced antenna by low-loss radio frequency cable, passive minute mixer, coupler, when loss of signal is excessive, then compensates loss by trunk amplifier.
But, for the TD-SCDMA 3-G (Generation Three mobile communication system) of using the 2GHz frequency range, 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, the number that then needs to increase the power output of trunk amplifier or increase trunk amplifier, thus 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, the spaced antenna of this covering scheme to the loss of information source generally more than 20dB, being positioned at the portable terminal that covers fringe region must will increase system interference like this with very big transmitting power connecting system, 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 literature CN1832358A, be downconverted to intermediate frequency and in radio frequency cable, transmit by many nets being closed information source behind the road, the cable far-end receives and is raised to radio frequency by frequency converter behind this signal and exports antenna again to, or antenna receive signal by 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, does not have feasibility for the TD-SCDMA system.
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
Purpose of the present 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 by 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 be achieved through the following technical solutions:
The TD-SCDMA indoor distributed system of this analog intermediate frequency comprises intermediate frequency access module, intermediate frequency expansion module and radio-frequency module, it is characterized in that:
Zoom out connection between intermediate frequency access module, intermediate frequency expansion module and the radio-frequency module of A, independent setting separately, realize the processing of TD-SCDMA downlink Signal Processing and up received signal.
B, described intermediate frequency 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 access module, far-end RF module is that radiofrequency signal is launched by the antenna that is attached thereto by 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 by antenna and send to the intermediate frequency expansion module, the intermediate frequency expansion module sends to the intermediate frequency access module after the upward signal that receives is closed road and gain adjustment, the intermediate frequency 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 received signal and handles the path.
Described intermediate frequency access module adopts 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 group radio-frequency module that radio-frequency module comprised adopts how point-to-point the connection with the intermediate frequency expansion module.
Zoom out by the wire transmission media between described intermediate frequency access module and the intermediate frequency expansion module and be connected, described wire transmission media comprises optical fiber, arrowband coaxial cable.
Zoom out by 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.
Also comprise a TD-SCDMA clock recovery module in described intermediate frequency access module or the intermediate frequency expansion module, obtain TD-SCDMA frame synchronizing signal and reference clock by the descending intermediate-freuqncy signal of demodulation, frame synchronizing signal provides TDD transmitting-receiving switching controls for indoor distributed system, and reference clock provides reference clock for radio-frequency module.
Described intermediate frequency access module or intermediate frequency expansion module comprise that also a radio-frequency module for far-end provides the power distribution module of remote power feeding.
Described intermediate frequency access module comprises modules such as the FSK modulating/demodulating of intermediate frequency switch, uplink and downlink gain controlling, middle frequency division, mixer, microcontroller, pilot signal and uplink and downlink duplexer, also comprises optical transceiver module when adopting optical fiber to be connected with the intermediate frequency expansion module; On wherein time-multiplexed/descending analog if signal 4 and information source link to each other with intermediate frequency switch 5 in the intermediate frequency access module; Descending analog if signal is selected to link to each other with descending gain control module through intermediate frequency switch, gaining, it is synthetic with the descending pilot signal frequency division multiplexing in descending duplexer through the FSK debugging from the output of FSK modulation/demodulation modules to adjust the back, 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 by the arrowband coaxial cable respectively; When intermediate frequency access module and intermediate frequency expansion module adopted narrow band fiber to be connected, four road signals were converted to light signal through four optical transceiver modules respectively and transmit in narrow band fiber; The intermediate frequency access module receives the up pilot signal of up analog if signal from the frequency division multiplexing of each intermediate frequency expansion module through the arrowband coaxial cable or by optical transceiver module through narrow band fiber, in mixer, close the road, mixer links to each other with up duplexer, 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 modulation/demodulation modules, up analog if signal links to each other with up gain control module, after gain is adjusted, be connected, carry out up-downgoing analog if signal time division multiplexing by intermediate frequency switch with intermediate frequency switch 5; Pilot signal 7 is connected with microcontroller with information source, and microcontroller links to each other with the FSK modulation/demodulation modules, on the one hand the system descending pilot signal is sent to the FSK modulation/demodulation modules 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 the intermediate frequency access module; Wherein the descending composite signal from the intermediate frequency access module is connected with descending duplexer through the arrowband coaxial cable, when intermediate frequency 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 modulation/demodulation modules, isolated descending analog if signal is connected with synchronous and clock recovery unit with the loss compensating module respectively, entering descending gain control module through the descending analog if signal of loss compensation gains and is connected to power supply after adjusting, clock, synchronous sub-signal road device, reaching the clock recovery unit synchronously extracts TD-SCDMA synchronizing signal and reference clock and is connected to power supply from descending analog if signal, clock, synchronous sub-signal road device, outside 220V AC or-the 48VDC power supply is connected to power module, the power supply that the generation radio-frequency module needs also is connected to power supply, clock, synchronous sub-signal road device, power supply, clock, sub-signal road device is power supply synchronously, descending analog if signal, reference clock, synchronizing signal respectively is divided into eight the tunnel, and is 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 up duplexer, in up duplexer, carry out frequency division multiplexing with up pilot signal from the FSK modulation/demodulation modules, be transferred to the intermediate frequency access module by the arrowband coaxial cable, when adopting narrow band fiber to connect, must be converted to behind the light signal intermediate frequency access module by optical transceiver module by the narrow band fiber transmission; Microcontroller also links to each other with each adapter, receive and the uplink and downlink pilot signal that sends radio-frequency module, microcontroller also links to each other with the FSK modulation/demodulation modules, 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 radio-frequency module comprises parts such as the compensation of intermediate frequency loss, power module, duplexer, intermediate frequency switch, uplink and downlink gain controlling, local oscillator, upper and lower frequency converter, descending power control module and power amplifier, low noise amplifier, radio-frequency (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 radio-frequency module by the RJ45 interface, and wherein pilot signal is connected with control unit with synchronous signal line, realizes the relevant control of radio-frequency module after control unit inside is to above-mentioned signal processing; 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 radio-frequency 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 intermediate frequency switch 5; Switch is isolated time-multiplexed descending, up analog if signal by 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, be converted to by upconverter and 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 radio-frequency (RF) switch 9, radio-frequency (RF) switch 9 is subjected to synchronizing signal control to receive and dispatch switching, send downlink radio-frequency signal to radio-frequency filter 10, being connected to antenna 3 after the filtering launches, when being connected to a plurality of antenna, radio-frequency filter 10 must be connected with antenna by dividing mixer; Antenna 3 also receives up radiofrequency signal, by minute mixer or be directly connected to radio-frequency filter, be connected to low noise amplifier by radio-frequency (RF) switch 9 after the filtering and carry out the signal amplification, and be connected with low-converter 11, in low-converter 11, be converted to 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 radio-frequency (RF) local oscillator that is locked in reference clock signal.
This system comprises an intermediate frequency expansion module and one group of radio-frequency module, described intermediate frequency expansion module by 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, time-multiplexed on/descending intermediate-freuqncy signal, pilot signal, reference clock, frame synchronizing signal and power supply is synthetic or respectively carrying with in each connection line.
At this moment, described intermediate frequency access module adopts being connected of point-to-multipoint with one group of radio-frequency module that radio-frequency module 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, by the analog if signal of TD-SCDMA with pilot signal, reference clock, frame synchronizing signal by 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.By extract frame synchronizing signal and reference clock from downstream signal, 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 does not need to provide independent synchronizing signal and reference clock from information source.Further meaning of the present invention is, by 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, improve the uniformity that signal covers on the other hand, made 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 schematic diagram for the intermediate frequency access module;
Fig. 3 constitutes schematic diagram for the intermediate frequency expansion module;
Fig. 4 constitutes schematic diagram for radio-frequency module;
Indoor distribution connection diagram during accompanying drawing 5 practical application of the present invention;
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 schematic diagram.
Among the figure: on 1-arrowband coaxial cable or the optical fiber 2-ethernet line 3-antenna 4-/descending analog if signal 5-intermediate frequency switch 6-optical fiber/coaxial cable 7-pilot signal 8-upconverter 9-radio-frequency (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, by 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 in 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 comprises as shown in Figure 1:
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 access module.
Intermediate frequency access module: carry out the transmission of up-downgoing analog if signal by 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 by 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 the intermediate frequency access module by arrowband coaxial cable or optical fiber, receive and transmission up-downgoing analog if signal and pilot signal, and be connected with radio-frequency module by ethernet line, this module comprises that intermediate frequency loss compensation AGC amplifier, intermediate frequency divide that mixer, transmit-receive switch switch, FSK de/modulation device, duplexer, power distribution module and the frame synchronization of pilot signal are extracted and reference clock recovers module.
Radio-frequency module (IAU): link to each other with the intermediate frequency expansion module by 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 access module, intermediate frequency expansion module and radio-frequency module, it is characterized in that:
Zoom out connection between intermediate frequency access module, intermediate frequency expansion module and the radio-frequency module of A, independent setting separately, realize the processing of TD-SCDMA downlink Signal Processing and up received signal.
B, described intermediate frequency 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 access module, far-end RF module is that radiofrequency signal is launched by the antenna that is attached thereto by 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 by antenna and send to the intermediate frequency expansion module, the intermediate frequency expansion module sends to the intermediate frequency access module after the upward signal that receives is closed road and gain adjustment, the intermediate frequency 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 received signal and handles the path.
Described intermediate frequency access module adopts 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 group radio-frequency module that radio-frequency module comprised adopts how point-to-point the connection with the intermediate frequency expansion module.
Zoom out by the wire transmission media between described intermediate frequency access module and the intermediate frequency expansion module and be connected, described wire transmission media comprises narrow band fiber, arrowband coaxial cable.
Zoom out by 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.
Also comprise a TD-SCDMA clock recovery module in described intermediate frequency access module or the intermediate frequency expansion module, obtain TD-SCDMA frame synchronizing signal and reference clock by the descending intermediate-freuqncy signal of demodulation, frame synchronizing signal provides TDD transmitting-receiving switching controls for indoor distributed system, and reference clock provides reference clock for radio-frequency module.
Described intermediate frequency access module or intermediate frequency expansion module also comprise a power distribution module, for the radio-frequency module of far-end provides remote power feeding.
Also comprise the down transmitting power controlled function in the described radio-frequency module, be used to adjust down transmitting power.
As the improvement of above-mentioned basic scheme, the invention provides another kind of TD-SCDMA indoor distributed system, comprise an intermediate frequency access module, one group of intermediate frequency expansion module and organize radio-frequency module more; Each intermediate frequency expansion module independently that a described intermediate frequency access module is connected to that one group of intermediate frequency expansion module comprises by 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 in the mode of frequency division multiplexing; Described each intermediate frequency expansion module is connected with each group radio-frequency module by 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 carry respectively and in each connection line.
At this moment, described intermediate frequency access module adopts 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 group radio-frequency module that radio-frequency module comprised adopts how point-to-point the connection with the intermediate frequency expansion module.
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 one group of radio-frequency module, described intermediate frequency expansion module by 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 respectively carrying with in each connection line.
At this moment, described intermediate frequency access module adopts being connected of point-to-multipoint with one group of radio-frequency module that radio-frequency module 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 case of the present invention uses as shown in Figure 1, and its basic functional principle is:
The intermediate frequency access module is used to finish 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 access module and the IHU and up-downgoing intermediate-freuqncy signal adopt the mode of frequency division multiplexing to be connected by transmitting-receiving a pair of arrowband cable or optical fiber; Also can connect by an arrowband coaxial cable, up-downgoing this moment analog if signal adopts time-multiplexed mode.The intermediate frequency 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 the intermediate frequency access module, from signal, extract frame synchronizing signal and reference clock, and be distributed to the radio-frequency module (IAU) that inserts IHU by 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 and is transmitted to the intermediate frequency access module with up pilot signal after the road is adjusted with gain; 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 in the RS-485 mode.
Radio-frequency module is realized the transmitting-receiving of wireless signal, wherein low noise amplifier, down-conversion mould device are finished the reception and the frequency conversion of up-link wireless signal, up-conversion mould device and power amplifier are finished the frequency conversion of descending intermediate-freuqncy signal and power amplification and are launched by 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 according to reference clock and for upper and lower frequency converter provides signal source, the descending power control module is set down transmitting power as required.
Above-mentioned indoor distributed system carries out oam by the intermediate frequency 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 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.
Use conveniently for installing, the structure that intermediate frequency 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.
Radio-frequency 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 and radio frequency coaxial-cable, installation is all very convenient, the radio frequency and the high power circuit of information source end have also been saved simultaneously, 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 example is a specific embodiment of the present invention only, 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 access module, intermediate frequency expansion module and radio-frequency module, it is characterized in that:
Zoom out connection between intermediate frequency access module, intermediate frequency expansion module and the radio-frequency module of A, independent setting separately, realize the processing of TD-SCDMA downlink Signal Processing and up received signal;
B, described intermediate frequency 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 access module, far-end RF module is that radiofrequency signal is launched by the antenna that is attached thereto by 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 by antenna and sends to the intermediate frequency expansion module simultaneously, the intermediate frequency expansion module sends to the intermediate frequency access module after the upward signal that receives is closed road and gain adjustment, the intermediate frequency 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 received signal and handles the 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 access module adopts 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 group radio-frequency module that radio-frequency module comprised adopts how point-to-point the connection with the intermediate frequency expansion module.
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 by the wire transmission media between described intermediate frequency 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 by 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 access module or the intermediate frequency expansion module, obtain TD-SCDMA frame synchronizing signal and reference clock by the descending intermediate-freuqncy signal of demodulation, frame synchronizing signal provides TDD transmitting-receiving switching controls for indoor distributed system, and reference clock provides reference clock for radio-frequency module.
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 access module or intermediate frequency expansion module comprise that also a radio-frequency module for far-end provides the power distribution module of remote power feeding.
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 access module comprises modules such as the FSK modulating/demodulating of intermediate frequency switch, uplink and downlink gain controlling, middle frequency division, mixer, microcontroller, pilot signal and uplink and downlink duplexer, also comprises optical transceiver module when adopting optical fiber to be connected with the intermediate frequency expansion module; On wherein time-multiplexed/descending analog if signal (4) and information source link to each other with intermediate frequency switch (5) in the intermediate frequency access module; Descending analog if signal is selected to link to each other with descending gain control module through intermediate frequency switch, gaining, it is synthetic with the descending pilot signal frequency division multiplexing in descending duplexer through the FSK debugging from the output of FSK modulation/demodulation modules to adjust the back, 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 by the arrowband coaxial cable respectively; When intermediate frequency access module and intermediate frequency expansion module adopted narrow band fiber to be connected, four road signals were converted to light signal through four optical transceiver modules respectively and transmit in narrow band fiber; The intermediate frequency access module receives the up pilot signal of up analog if signal from the frequency division multiplexing of each intermediate frequency expansion module through the arrowband coaxial cable or by optical transceiver module through narrow band fiber, in mixer, close the road, mixer links to each other with up duplexer, 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 modulation/demodulation modules, up analog if signal links to each other with up gain control module, after gain is adjusted, be connected, carry out up-downgoing analog if signal time division multiplexing by intermediate frequency switch with intermediate frequency switch (5); Pilot signal (7) is connected with microcontroller with information source, and microcontroller links to each other with the FSK modulation/demodulation modules, on the one hand the system descending pilot signal is sent to the FSK modulation/demodulation modules to modulate, 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 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 the intermediate frequency access module; Wherein the descending composite signal from the intermediate frequency access module is connected with descending duplexer through the arrowband coaxial cable, when intermediate frequency 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 modulation/demodulation modules, isolated descending analog if signal is connected with synchronous and clock recovery unit with the loss compensating module respectively, entering descending gain control module through the descending analog if signal of loss compensation gains and is connected to power supply after adjusting, clock, synchronous sub-signal road device, reaching the clock recovery unit synchronously extracts TD-SCDMA synchronizing signal and reference clock and is connected to power supply from descending analog if signal, clock, synchronous sub-signal road device, outside 220V AC or-the 48VDC power supply is connected to power module, the power supply that the generation radio-frequency module needs also is connected to power supply, clock, synchronous sub-signal road device, power supply, clock, sub-signal road device is power supply synchronously, descending analog if signal, reference clock, synchronizing signal respectively is divided into eight the tunnel, and is 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 up duplexer, in up duplexer, carry out frequency division multiplexing with up pilot signal from the FSK modulation/demodulation modules, be transferred to the intermediate frequency access module by the arrowband coaxial cable, when adopting narrow band fiber to connect, must be converted to behind the light signal intermediate frequency access module by optical transceiver module by the narrow band fiber transmission; Microcontroller also links to each other with each adapter, receive and the uplink and downlink pilot signal that sends radio-frequency module, microcontroller also links to each other with the FSK modulation/demodulation modules, 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.
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 parts such as the compensation of intermediate frequency loss, power module, duplexer, intermediate frequency switch, uplink and downlink gain controlling, local oscillator, upper and lower frequency converter, descending power control module and power amplifier, low noise amplifier, radio-frequency (RF) switch, antenna filter, when supporting a plurality of antennas also to comprise a branch mixer when connecting; The ethernet line (2) that it is connected with the intermediate frequency expansion module is connected to radio-frequency module by the RJ45 interface, and wherein pilot signal is connected with control unit with synchronous signal line, realizes the relevant control of radio-frequency module after control unit inside is to above-mentioned signal processing; 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 radio-frequency 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 intermediate frequency switch (5); Switch is isolated time-multiplexed descending, up analog if signal by 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, be converted to by upconverter and 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 radio-frequency (RF) switch (9), radio-frequency (RF) switch (9) is subjected to synchronizing signal control to receive and dispatch switching, send downlink radio-frequency signal to radio-frequency filter (10), being connected to antenna (3) after the filtering launches, when being connected to a plurality of antenna, radio-frequency filter (10) must be connected with antenna by dividing mixer; Antenna (3) also receives up radiofrequency signal, by minute mixer or be directly connected to radio-frequency filter, be connected to low noise amplifier by radio-frequency (RF) switch (9) after the filtering and carry out the signal amplification, and be connected with low-converter (11), be connected to the adjustment that gains of up gain control module after in low-converter (11), being converted to 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), for upper and lower frequency conversion provides the radio-frequency (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 by 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, time-multiplexed on/descending intermediate-freuqncy signal, pilot signal, reference clock, frame synchronizing signal and power supply is synthetic or respectively carrying with in each connection line.
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 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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| CN2007100375159A CN101247162B (en) | 2007-02-13 | 2007-02-13 | TD-SCDMA indoor distribution system simulating intermediate frequency |
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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 |
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| US5579341A (en) * | 1994-12-29 | 1996-11-26 | Motorola, Inc. | Multi-channel digital transceiver and method |
| CN100399842C (en) * | 2005-02-03 | 2008-07-02 | 芯通科技（成都）有限公司 | Middle-frequency transmission method and middle-frequency interface for base-station to realize radio-frequency zoom-out |
| CN100372265C (en) * | 2006-03-28 | 2008-02-27 | 华为技术有限公司 | Indoor distribution system and its netting method |
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| CN105450237A (en) * | 2015-11-11 | 2016-03-30 | 中国电子科技集团公司第四十一研究所 | Digital intermediate-frequency dynamic range expansion method |
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