CN104348537A - Microwave equipment-based quick transmitting system - Google Patents
Microwave equipment-based quick transmitting system Download PDFInfo
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- CN104348537A CN104348537A CN201410593712.9A CN201410593712A CN104348537A CN 104348537 A CN104348537 A CN 104348537A CN 201410593712 A CN201410593712 A CN 201410593712A CN 104348537 A CN104348537 A CN 104348537A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/403—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/024—Channel estimation channel estimation algorithms
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- Computer Networks & Wireless Communication (AREA)
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- Radio Relay Systems (AREA)
Abstract
The invention discloses a microwave equipment-based quick transmitting system, which is high in environmental adaptability. Real-time adaption to different data transmission rates can be performed, the transmitting speed is high, and the intelligence degree is high; meanwhile, due to the fact that a self-adapting interference eliminating unit is arranged, system self-oscillation interference and a signal deterioration phenomenon are avoided, synchronization with a base station is realized, the synchronization stability is improved, and the system has a practical beneficial effect.
Description
Technical field
The present invention relates to field of microwave communication, particularly relate to a kind of fast-forwarding system based on microwave equipment.
Background technology
Forward in the communication technology at traditional microwave relay, the TDMA technology of usual employing point-to-multipoint, data transmission rate is more fixing, generally arrange fixing data rate communications according to the change of communication distance and communication environment, this communication mode is more stable but changing capability with environment is poor, and data transmission rate is fixed, data retransmission speed is not high, can not meet higher communication quality, transfer rate conversion is complicated, to burst transfer bad adaptability.
In addition, there is comparatively serious self-interference problem and step-out problem in existing microwave repeater system.
Summary of the invention
The object of the invention is to be achieved through the following technical solutions.
According to the embodiment of the present invention, a kind of fast-forwarding system based on microwave equipment is proposed, described system comprises the bidirectional coupled component circuit (1) coupled successively, expansion carrier wave combiner circuit (2), non-expanding carrier wave combiner circuit (3), carrier wave adapter circuit (4), first intermediate frequency frequency changer circuit (5), second intermediate frequency frequency changer circuit (6), middle change adapter circuit (7), D/A converting circuit (8), automatic gain adjusting circuit (9), Gain filter circuit (10), analog to digital conversion circuit (11), baseband conversion circuit (12), ripple combiner circuit (13) is unloaded in expansion, non-expanding unloads ripple combiner circuit (14), second transfer rate adapter circuit (15) and power supply unit (17),
The data that described bidirectional coupled component circuit (1) inputs outside and clock signal carry out frame serioparallel exchange and add auxiliary redundancy forming serial trunk information, and bidirectional coupled component circuit (1) exports serial trunk information to expanding carrier wave combiner circuit (2) and non-expanding carrier wave combiner circuit (3);
Described expansion carrier wave combiner circuit (2) carries out carrier wave synthesis to serial trunk information and to export two-way bandwidth identical, the expansion carrier wave composite signal that expansion multiple is different;
Serial trunk information is carried out the synthesis of TURBO forward error correction coding carrier wave by described non-expanding carrier wave combiner circuit (3), exports two-way non-expanding carrier wave composite signal;
Described carrier wave adapter circuit (4) is carried out adaptation according to current data transmission rate to expansion carrier wave composite signal and non-expanding carrier wave composite signal and exports inphase quadrature two-way baseband signal;
Described inphase quadrature two-way baseband signal carries out the LIF frequency spectrum migration of 20M by the first intermediate frequency frequency changer circuit (5), and inphase quadrature two-way baseband signal carries out the LIF signal spectrum migration of 50M through the second intermediate frequency frequency changer circuit (6);
Signal after two-way spectrum offset exports LIF signal to D/A converting circuit (8) and automatic gain adjusting circuit (9) respectively by the adaptation of middle change adapter circuit (7);
RF unit is outputted to after the LIF signal that described D/A converting circuit (8) centering change adapter circuit (7) exports carries out digital to analog conversion;
Gain filter circuit (10) is input to after the LIF signal that middle change adapter circuit (7) inputs by described automatic gain adjusting circuit (9) and the 50MLIF signal that RF unit inputs carry out gain-adjusted;
Described Gain filter circuit (10) is sent to analog to digital conversion circuit (11) after carrying out the filtering of frequency band gate gain to gain amplifying signal;
Filtered for frequency band gate gain signal is carried out data sampling and becomes digital signal by analog-digital conversion circuit as described (11), and digital signal is sent to baseband conversion circuit (12);
Above-mentioned digital signal is converted to two-way zero intermediate frequency signals and outputs to expansion respectively and unload ripple combiner circuit (13) and non-expanding and unload ripple combiner circuit (14) and carry out unloading ripple synthesis by described baseband conversion circuit (12);
Described expansion is unloaded ripple combiner circuit (13) and non-expanding and is unloaded ripple combiner circuit (14) signal after unloading ripple synthesis is outputted to the second transfer rate adapter circuit (15), described second transfer rate adapter circuit (15) according to current reverse data transmission rate to above-mentioned expansion unload that ripple combiner circuit (13) and non-expanding unload that ripple combiner circuit (14) exports unload ripple synthesize after signal carry out transfer rate adaptation;
Described second transfer rate adapter circuit (15) exports to unload ripple synthesis clock information and unload ripple generated data code and carries out frame parallel-serial conversion to bidirectional coupled component circuit (1) and recover serial trunk information and clock information;
Described second transfer rate adapter circuit (15) also will unload ripple composite signal and export carrier wave adapter circuit to.
According to the preferred embodiment of the present invention, described carrier wave adapter circuit comprises: information feedback circuit, first transfer rate adapter circuit, and phase shift circuitry, the ripple that unloads that described information feedback circuit is used for sending according to the second transfer rate adapter circuit (15) synthesizes the estimation that LLR information carries out channel condition information, and the channel condition information estimated is sent to the first transfer rate adapter circuit, described first transfer rate adapter circuit is according to the channel condition information estimated in real time and the channel condition information prestored, transfer rate, and the mapping relations of carrier wave synthesis mode perform the adaptation of current transmission rate, and export the signal after adaptation to phase shift circuitry, signal after adaptation is carried out phase transition by described phase shift circuitry, export homophase and orthogonal two paths of signals.
According to the preferred embodiment of the present invention, described information feedback circuit specifically comprises:
Least square LS estimation unit, is configured to unload according to received the LS estimated value that ripple composite signal calculates channel;
Signal-to-noise ratio (SNR) estimation unit, is configured to the signal to noise ratio estimating described channel;
Channel parameter estimation unit, is configured to estimate the channel parameter relevant to the delay spread of described channel;
Transition matrix selected cell, is configured to the select linear least mean-square error transition matrix according to estimated signal to noise ratio and estimated channel parameter;
Linear minimum mean-squared error transition element, the linear minimum mean-squared error transition matrix be configured to selected by using carries out linear minimum mean-squared error filtering to described LS estimated value; And
Output unit, is configured to filter result to export as channel-estimation information.
According to the preferred embodiment of the present invention, described middle change adapter circuit comprises: band interference probe unit and LIF adaptation unit, described band interference probe unit carries out Real-Time Monitoring to 20M and the 50MLIF frequency band run, determine current existence interference or available LIF frequency band, described LIF adaptation unit, according to the result of detection of band interference probe unit, carries out adaptation to the LIF signal of transmission.
According to the preferred embodiment of the present invention, the described data forwarding system based on microwave equipment also comprises Adaptive interference cancellation unit, and described Adaptive interference cancellation unit comprises the subtraction device module, decorrelation time delay module, delay cell module, time delay estimation module, gain estimation module and the accumulator module that connect successively.
According to the embodiment of the present invention, the described data forwarding system based on microwave equipment also comprises adaptive demodulation lock unit, for guaranteeing the real-time Complete Synchronization of repeater system and base station, described adaptive demodulation lock unit specifically comprises: the amplitude information that connects successively obtains and Waveform adjusting circuit and Digital Signal Processing and synchronous control unit, wherein amplitude information obtains and is connected with the second transfer rate adapter circuit with Waveform adjusting circuit, and Digital Signal Processing and synchronous control unit are connected to the uplink downlink of repeater system.
Fast-forwarding system environments based on microwave equipment of the present invention is adaptable, adapted in real time can be carried out for different data transmission rates, forwarding speed is high, intelligent high, simultaneously by arranging Adaptive interference cancellation unit, avoid the generation of system self-oscillation interference and signal corruptions, and it is synchronous to achieve with base station, improve the stability of synchronization, there is useful real effect.
Accompanying drawing explanation
By reading hereafter detailed description of the preferred embodiment, various other advantage and benefit will become cheer and bright for those of ordinary skill in the art.Accompanying drawing only for illustrating the object of preferred implementation, and does not think limitation of the present invention.And in whole accompanying drawing, represent identical parts by identical reference symbol.In the accompanying drawings:
Figure 1 show the fast-forwarding system configuration schematic diagram based on microwave equipment according to embodiment of the present invention;
Figure 2 illustrate the carrier wave adapter circuit structural representation according to embodiment of the present invention;
Figure 3 show according to becoming adapter circuit structural representation in embodiment of the present invention;
Fig. 4 illustrate and unload ripple combiner circuit structural representation according to the expansion of embodiment of the present invention;
Fig. 5 illustrate the Adaptive interference cancellation cellular construction schematic diagram according to embodiment of the present invention;
Figure 6 show the adaptive demodulation lock unit structural representation according to embodiment of the present invention;
Figure 7 show the automatic gain adjusting circuit structural representation according to embodiment of the present invention.
Embodiment
Below with reference to accompanying drawings illustrative embodiments of the present disclosure is described in more detail.Although show illustrative embodiments of the present disclosure in accompanying drawing, however should be appreciated that can realize the disclosure in a variety of manners and not should limit by the execution mode of setting forth here.On the contrary, provide these execution modes to be in order to more thoroughly the disclosure can be understood, and complete for the scope of the present disclosure can be conveyed to those skilled in the art.
According to the embodiment of the present invention, a kind of fast-forwarding system based on microwave equipment is proposed, as shown in Figure 1, described system comprises the bidirectional coupled component circuit (1) coupled successively, expansion carrier wave combiner circuit (2), non-expanding carrier wave combiner circuit (3), carrier wave adapter circuit (4), first intermediate frequency frequency changer circuit (5), second intermediate frequency frequency changer circuit (6), middle change adapter circuit (7), D/A converting circuit (8), automatic gain adjusting circuit (9), Gain filter circuit (10), analog to digital conversion circuit (11), baseband conversion circuit (12), ripple combiner circuit (13) is unloaded in expansion, non-expanding unloads ripple combiner circuit (14), transfer rate adapter circuit 15 and power supply unit (17),
The data that described bidirectional coupled component circuit (1) inputs outside and clock signal carry out frame serioparallel exchange and add auxiliary redundancy forming serial trunk information, and bidirectional coupled component circuit (1) exports serial trunk information to expanding carrier wave combiner circuit (2) and non-expanding carrier wave combiner circuit (3);
Described expansion carrier wave combiner circuit (2) carries out carrier wave synthesis to serial trunk information and to export two-way bandwidth identical, the expansion carrier wave composite signal that expansion multiple is different; Preferably, described expansion carrier wave combiner circuit adopts direct sequence spread spectrum;
Serial trunk information is carried out the synthesis of TURBO forward error correction coding carrier wave by described non-expanding carrier wave combiner circuit (3), exports two-way non-expanding carrier wave composite signal; Preferably, described non-expanding carrier wave composite signal is single channel signal;
Described carrier wave adapter circuit (4) is carried out adaptation according to current data transmission rate to expansion carrier wave composite signal and non-expanding carrier wave composite signal and exports inphase quadrature two-way baseband signal;
Described inphase quadrature two-way baseband signal carries out LIF (intermediate frequency) the frequency spectrum migration of 20M by the first intermediate frequency frequency changer circuit (5), and inphase quadrature two-way baseband signal carries out the LIF signal spectrum migration of 50M through the second intermediate frequency frequency changer circuit (6);
Signal after two-way spectrum offset exports LIF signal to D/A converting circuit (8) and automatic gain adjusting circuit (9) respectively by the adaptation of middle change adapter circuit (7);
RF unit is outputted to after the LIF signal that described D/A converting circuit (8) centering change adapter circuit (7) exports carries out digital to analog conversion;
Gain filter circuit (10) is input to after the LIF signal that middle change adapter circuit (7) inputs by described automatic gain adjusting circuit (9) and the 50MLIF signal that RF unit inputs carry out gain-adjusted;
Described Gain filter circuit (10) is sent to analog to digital conversion circuit (11) after carrying out the filtering of frequency band gate gain to gain amplifying signal;
Filtered for frequency band gate gain signal is carried out data sampling and becomes digital signal by analog-digital conversion circuit as described (11), and digital signal is sent to baseband conversion circuit (12);
Above-mentioned digital signal is converted to two-way zero intermediate frequency signals and outputs to expansion respectively and unload ripple combiner circuit (13) and non-expanding and unload ripple combiner circuit (14) and carry out unloading ripple synthesis by described baseband conversion circuit (12);
Described expansion is unloaded ripple combiner circuit (13) and non-expanding and is unloaded ripple combiner circuit (14) signal after unloading ripple synthesis is outputted to the second transfer rate adapter circuit (15), described second transfer rate adapter circuit (15) according to current reverse data transmission rate to above-mentioned expansion unload that ripple combiner circuit (13) and non-expanding unload that ripple combiner circuit (14) exports unload ripple synthesize after signal carry out transfer rate adaptation; What described expansion unloaded that ripple combiner circuit (13) and non-expanding unload ripple combiner circuit (14) unloads the inverse process that ripple synthesis mode is said carrier building-up process;
Described second transfer rate adapter circuit (15) exports to unload ripple synthesis clock information and unload ripple generated data code and carries out frame parallel-serial conversion to bidirectional coupled component circuit (1) and recover serial trunk information and clock information;
Described second transfer rate adapter circuit (15) also will unload ripple composite signal and export carrier wave adapter circuit to.
According to the preferred embodiment of the present invention, described carrier wave adapter circuit comprises, as shown in Figure 2: information feedback circuit, first transfer rate adapter circuit, and phase shift circuitry, the ripple that unloads that described information feedback circuit is used for sending according to the second transfer rate adapter circuit (15) synthesizes the estimation that LLR information carries out channel condition information, and the channel condition information estimated is sent to the first transfer rate adapter circuit, described first transfer rate adapter circuit is according to the channel condition information estimated in real time and the channel condition information prestored, transfer rate, and the mapping relations of carrier wave synthesis mode perform the adaptation of current transmission rate, such as determine adaptive expansion carrier wave combiner circuit (2) or the output signal of non-expanding carrier wave combiner circuit (3), and export the signal after adaptation to phase shift circuitry, signal after adaptation is carried out phase transition by described phase shift circuitry, export homophase and orthogonal two paths of signals.
According to the preferred embodiment of the present invention, described information feedback circuit specifically comprises:
Least square LS estimation unit, is configured to unload according to received the LS estimated value that ripple composite signal calculates channel;
Signal-to-noise ratio (SNR) estimation unit, is configured to the signal to noise ratio estimating described channel;
Channel parameter estimation unit, is configured to estimate the channel parameter relevant to the delay spread of described channel;
Transition matrix selected cell, is configured to the select linear least mean-square error transition matrix according to estimated signal to noise ratio and estimated channel parameter;
Linear minimum mean-squared error transition element, the linear minimum mean-squared error transition matrix be configured to selected by using carries out linear minimum mean-squared error filtering to described LS estimated value; And
Output unit, is configured to filter result to export as channel-estimation information.
The effect of described information feedback circuit is when not needing to add additional redundancy, the real time status of channel is estimated thus determines different data transmission rates, thus channel capacity is utilized more fully, finally improve communication efficiency.
According to the preferred embodiment of the present invention, described middle change adapter circuit comprises, as shown in Figure 3: band interference probe unit and LIF adaptation unit, described band interference probe unit carries out Real-Time Monitoring to 20M and the 50MLIF frequency band run, determine current existence interference or available LIF frequency band, described LIF adaptation unit, according to the result of detection of band interference probe unit, carries out adaptation to the LIF signal of transmission.
According to the preferred embodiment of the present invention, described expansion is unloaded ripple combiner circuit and is comprised, as shown in Figure 4: the first low-pass filter circuit, the second low-pass filter circuit, 4K direct sequence spread spectrum unload ripple combiner circuit, 90K linear frequency modulation unloads ripple combiner circuit and 650K linear frequency modulation unloads ripple combiner circuit, in-phase signal is outputted to the first low-pass filter circuit by baseband conversion circuit, orthogonal signalling are outputted to the second low-pass filter circuit by baseband conversion circuit, first low-pass filter circuit and the second low-pass filter circuit carry out low-pass filtering according to spread bandwidth respectively to inphase quadrature two paths of signals and obtain inphase quadrature two-way baseband signal, inphase quadrature two-way baseband signal is sent into direct sequence spread spectrum and unloads ripple combiner circuit, 90k linear frequency modulation unloads ripple combiner circuit and 650K linear frequency modulation and unloads ripple combiner circuit and carry out unloading ripple synthesis process and obtain corresponding unloading ripple generated data code, unload ripple synthesis clock information, and send into the second transfer rate adapter circuit (15) and carry out adaptation.
According to the embodiment of the present invention, the described data forwarding system based on microwave equipment also comprises Adaptive interference cancellation unit, and as shown in Figure 5, described Adaptive interference cancellation unit specifically comprises:
Subtraction device module, its role is to input signal that Jiang Yilu is set as being superimposed with the useful signal of feedback signal and deducts the difference signal exporting after another road is set as the input signal of the feedback signal estimated and be set as eliminating signal after feedback;
Decorrelation time delay module, its role is to carry out time delay processing to input signal;
Delay cell module, its role is to the desired signal producing the different CHIP of time delay;
Time delay estimation module, its role is to utilize cross-correlation technique and the desired signal of the different CHIP of the time delay exported according to delay cell module and subtraction device module export eliminate feedback after signal produce corresponding adaptive filter coefficient and export;
Gain estimation module, its role is to according to the desired signal of the different CHIP of time delay and the adaptive filter coefficient of correspondence and utilizes LMS algorithm to produce the feedback signal of corresponding estimation;
Accumulator module, its role is to carry out accumulation process to multiple input signal and export accumulation result;
One of described subtraction device module is set as that the input of the useful signal being superimposed with feedback signal is connected to the output of converter unit, another of subtraction device module is set as the output of the input termination accumulator module of the feedback signal estimated, after being set as of subtraction device module eliminates feedback, the output of signal is connected to decorrelation time delay module and time delay estimation module respectively; One output of decorrelation time delay module connects the input of converter unit, and another output of decorrelation time delay module connects delay cell module and time delay estimation module respectively; Be provided with the desired signal that limited little delay cell module produces time delay limited CHIP respectively in delay cell module, the output of delay cell module is connected to the input of time delay estimation module; The output of time delay estimation module is connected to the input of gain estimation module, is provided with limited little gain estimation module and utilizes LMS algorithm to produce the feedback signal of corresponding estimation according to the desired signal of the corresponding CHIP of time delay and corresponding adaptive filter coefficient respectively in gain estimation module; The output of gain estimation module is connected to the input of accumulator module.
According to the embodiment of the present invention, the described data forwarding system based on microwave equipment also comprises adaptive demodulation lock unit, and for guaranteeing the real-time Complete Synchronization of repeater system and base station, as shown in Figure 6, described adaptive demodulation lock unit specifically comprises:
The amplitude information that connects successively obtains and Waveform adjusting circuit and Digital Signal Processing and synchronous control unit, wherein amplitude information obtains and is connected with the second transfer rate adapter circuit with Waveform adjusting circuit, and Digital Signal Processing and synchronous control unit are connected to the uplink downlink of repeater system;
Described amplitude information obtains and comprises sampling hold circuit and real-time comparator circuit with Waveform adjusting circuit, and described sampling hold circuit receives the signal that the second transfer rate adapter circuit exports, and flows to described real-time comparator circuit after process.
Described Digital Signal Processing and synchronous control unit comprise that the characteristic value arithmetic element, the frame synchronization head that are connected successively catch with generation unit, local frame synchronization head produces and correcting unit, synchronous control signal generation unit and microprocessor unit, and described characteristic value arithmetic element exports the seizure of frame synchronization head and generation unit to after the digital signal that real-time for prime comparator circuit exports is carried out characteristic value computing.
The analog voltage range signal that second transfer rate adapter circuit exports by described sampling hold circuit keeps process through over-sampling, when the digital signal processing unit in sampling hold circuit captures synchronous head, producing a synchronous control signal makes sampling hold circuit be in sample states at descending time slot, is in hold mode at ascending time slot;
Sampling hold circuit is outputed signal access real-time comparator by described real-time comparator circuit, it is made to convert TTL digital signal to, the core of this processing procedure is the self-adaptative adjustment of the comparison threshold realizing real-time comparator, the range signal specifically exported by sampling hold circuit is through an integrating circuit, and regulate the charging-discharging cycle of integrating circuit, the alternating current voltage component making it output signal is very little, namely the mean value of range signal is obtained, and using the comparison threshold of this mean value as real-time comparator circuit.
The digital signal that real-time for prime comparator circuit exports is carried out characteristic value computing by described characteristic value arithmetic element, find out the moment at the descending pilot frequency time slot place of each 5ms subframe, and produce a marking signal in this moment, this marking signal is exported to frame synchronization head and catch and generation unit;
The marking signal produced through characteristic value arithmetic element is carried out judgement with generation unit and processes by the seizure of frame synchronization head, when the time interval of 3 marking signals of adjacent generation is all 5ms, can judge that produced marking signal is effective, and marking signal produces frame synchronization head signal thus, and export the generation of local frame synchronization head and correcting unit to; Otherwise the marking signal that prime produces is invalid, does not produce frame synchronization head signal;
Local frame synchronization head produces and correcting unit first passes through the 5ms periodic frame synchronous head signal that internal counter timing produces a standard, when prime captures frame synchronization head through characteristic value computing, namely clear operation is carried out to the counter of local frame synchronization head generation and correcting unit, and the initial time using this moment as local frame synchronization head exports again, to realize the object correcting local frame synchronization head, local frame synchronization head signal is made to keep Complete Synchronization with the frame format signal received, then the frame synchronization head signal through overcorrect is exported to synchronous control signal generation unit,
Synchronous control signal generation unit be the frame synchronization head signal that exports with prime for benchmark, and in conjunction with the second time slot switching point information that microprocessor unit provides, produce and export the synchronous control signal needed for modules unit of direct discharging station;
Second time slot switching point information is delivered to synchronous control signal generation unit by microprocessor unit; Meanwhile, frame synchronization head catches, with generation unit, the seizure situation of synchronous head is flowed to microprocessor unit, and judges whether amplitude demodulation synchronization module is in desynchronizing state with this, and by this information reporting.
The advantage of the amplitude demodulation synchronization module of TD-SCDMA repeater system of the present invention is: compared with existing demodulation simultaneous techniques, present invention achieves the adjustment of real-time comparator threshold adaptive, substantially increases synchronous input power dynamic range; In Digital Signal Processing and synchronous control unit, have employed correcting scheme, further increase the stability of synchronization.
According to the preferred embodiment of the present invention, the specific design structure of described automatic gain adjusting circuit is, as shown in Figure 7: comprise variable-gain amplification circuit micro-processor interface circuit U1 and operational amplification circuit micro-processor interface circuit U2, the output of described variable-gain amplification circuit micro-processor interface circuit U1 is connected to the input of described operational amplification circuit micro-processor interface circuit U2, and the output of described operational amplification circuit micro-processor interface circuit U2 is connected to the gain control end VC of described variable-gain amplification circuit micro-processor interface circuit U1, also comprise diode D1, resistance R1-R4, electric capacity CC and CH, wherein, the signal input positive ending grounding of described variable-gain amplification circuit micro-processor interface circuit U1, signal input negative terminal connects input audio signal, the output of described variable-gain amplification circuit micro-processor interface circuit U1 is connected to the signal input anode of described operational amplification circuit micro-processor interface circuit U2, resistance R4 mono-termination DC reference voltage end VR, the signal input negative terminal of operational amplification circuit micro-processor interface circuit U2 described in another termination, the signal that described electric capacity CC is connected to described operational amplification circuit micro-processor interface circuit U2 inputs between negative terminal and output thereof, the output terminating diode D1 anode of described operational amplification circuit micro-processor interface circuit U2, the gain control end VC of described variable-gain amplification circuit micro-processor interface circuit U1 respectively with described resistance R1-R3, electric capacity CH one end is connected, the resistance R1 other end is connected with biased electrical pressure side V-, resistance R2 and electric capacity CH other end ground connection, the resistance R3 other end is connected with diode D1 negative terminal.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection range of claim.
Claims (6)
1. the fast-forwarding system based on microwave equipment, described system comprises the bidirectional coupled component circuit (1) coupled successively, expansion carrier wave combiner circuit (2), non-expanding carrier wave combiner circuit (3), carrier wave adapter circuit (4), first intermediate frequency frequency changer circuit (5), second intermediate frequency frequency changer circuit (6), middle change adapter circuit (7), D/A converting circuit (8), automatic gain adjusting circuit (9), Gain filter circuit (10), analog to digital conversion circuit (11), baseband conversion circuit (12), ripple combiner circuit (13) is unloaded in expansion, non-expanding unloads ripple combiner circuit (14), second transfer rate adapter circuit (15) and power supply unit (17),
The data that described bidirectional coupled component circuit (1) inputs outside and clock signal carry out frame serioparallel exchange and add auxiliary redundancy forming serial trunk information, and bidirectional coupled component circuit (1) exports serial trunk information to expanding carrier wave combiner circuit (2) and non-expanding carrier wave combiner circuit (3);
Described expansion carrier wave combiner circuit (2) carries out carrier wave synthesis to serial trunk information and to export two-way bandwidth identical, the expansion carrier wave composite signal that expansion multiple is different;
Serial trunk information is carried out the synthesis of TURBO forward error correction coding carrier wave by described non-expanding carrier wave combiner circuit (3), exports two-way non-expanding carrier wave composite signal;
Described carrier wave adapter circuit (4) is carried out adaptation according to current data transmission rate to expansion carrier wave composite signal and non-expanding carrier wave composite signal and exports inphase quadrature two-way baseband signal;
Described inphase quadrature two-way baseband signal carries out the LIF frequency spectrum migration of 20M by the first intermediate frequency frequency changer circuit (5), and inphase quadrature two-way baseband signal carries out the LIF signal spectrum migration of 50M through the second intermediate frequency frequency changer circuit (6);
Signal after two-way spectrum offset exports LIF signal to D/A converting circuit (8) and automatic gain adjusting circuit (9) respectively by the adaptation of middle change adapter circuit (7);
RF unit is outputted to after the LIF signal that described D/A converting circuit (8) centering change adapter circuit (7) exports carries out digital to analog conversion;
Gain filter circuit (10) is input to after the LIF signal that middle change adapter circuit (7) inputs by described automatic gain adjusting circuit (9) and the 50MLIF signal that RF unit inputs carry out gain-adjusted;
Described Gain filter circuit (10) is sent to analog to digital conversion circuit (11) after carrying out the filtering of frequency band gate gain to gain amplifying signal;
Filtered for frequency band gate gain signal is carried out data sampling and becomes digital signal by analog-digital conversion circuit as described (11), and digital signal is sent to baseband conversion circuit (12);
Above-mentioned digital signal is converted to two-way zero intermediate frequency signals and outputs to expansion respectively and unload ripple combiner circuit (13) and non-expanding and unload ripple combiner circuit (14) and carry out unloading ripple synthesis by described baseband conversion circuit (12);
Described expansion is unloaded ripple combiner circuit (13) and non-expanding and is unloaded ripple combiner circuit (14) signal after unloading ripple synthesis is outputted to the second transfer rate adapter circuit (15), described second transfer rate adapter circuit (15) according to current reverse data transmission rate to above-mentioned expansion unload that ripple combiner circuit (13) and non-expanding unload that ripple combiner circuit (14) exports unload ripple synthesize after signal carry out transfer rate adaptation;
Described second transfer rate adapter circuit (15) exports to unload ripple synthesis clock information and unload ripple generated data code and carries out frame parallel-serial conversion to bidirectional coupled component circuit (1) and recover serial trunk information and clock information;
Described second transfer rate adapter circuit (15) also will unload ripple composite signal and export carrier wave adapter circuit to.
2. the system as claimed in claim 1, described carrier wave adapter circuit comprises: information feedback circuit, first transfer rate adapter circuit, and phase shift circuitry, the ripple that unloads that described information feedback circuit is used for sending according to the second transfer rate adapter circuit (15) synthesizes the estimation that LLR information carries out channel condition information, and the channel condition information estimated is sent to the first transfer rate adapter circuit, described first transfer rate adapter circuit is according to the channel condition information estimated in real time and the channel condition information prestored, transfer rate, and the mapping relations of carrier wave synthesis mode perform the adaptation of current transmission rate, and export the signal after adaptation to phase shift circuitry, signal after adaptation is carried out phase transition by described phase shift circuitry, export homophase and orthogonal two paths of signals.
3. a system as claimed in claim 2, described information feedback circuit specifically comprises:
Least square LS estimation unit, is configured to unload according to received the LS estimated value that ripple composite signal calculates channel;
Signal-to-noise ratio (SNR) estimation unit, is configured to the signal to noise ratio estimating described channel;
Channel parameter estimation unit, is configured to estimate the channel parameter relevant to the delay spread of described channel;
Transition matrix selected cell, is configured to the select linear least mean-square error transition matrix according to estimated signal to noise ratio and estimated channel parameter;
Linear minimum mean-squared error transition element, the linear minimum mean-squared error transition matrix be configured to selected by using carries out linear minimum mean-squared error filtering to described LS estimated value; And
Output unit, is configured to filter result to export as channel-estimation information.
4. the system as claimed in claim 1, described middle change adapter circuit comprises: band interference probe unit and LIF adaptation unit, described band interference probe unit carries out Real-Time Monitoring to 20M and the 50MLIF frequency band run, determine current existence interference or available LIF frequency band, described LIF adaptation unit, according to the result of detection of band interference probe unit, carries out adaptation to the LIF signal of transmission.
5. the system as claimed in claim 1, the described data forwarding system based on microwave equipment also comprises Adaptive interference cancellation unit, and described Adaptive interference cancellation unit comprises the subtraction device module, decorrelation time delay module, delay cell module, time delay estimation module, gain estimation module and the accumulator module that connect successively.
6. the system as claimed in claim 1, the described data forwarding system based on microwave equipment also comprises adaptive demodulation lock unit, for guaranteeing the real-time Complete Synchronization of repeater system and base station, described adaptive demodulation lock unit specifically comprises: the amplitude information that connects successively obtains and Waveform adjusting circuit and Digital Signal Processing and synchronous control unit, wherein amplitude information obtains and is connected with the second transfer rate adapter circuit with Waveform adjusting circuit, and Digital Signal Processing and synchronous control unit are connected to the uplink downlink of repeater system.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3914693A1 (en) * | 1988-05-05 | 1989-11-16 | Marconi Adret | TWO-STANDARD GENERATOR FOR FREQUENCY CONVERSION, IN PARTICULAR FOR A MADE-TO-BE TELEVISION NETWORK |
| CN101047421A (en) * | 2006-04-28 | 2007-10-03 | 华为技术有限公司 | Device and method for mobile communication using repeater station |
| CN202503509U (en) * | 2012-02-15 | 2012-10-24 | 京信通信***（中国）有限公司 | Microwave remote system |
| CN103067960A (en) * | 2012-12-17 | 2013-04-24 | 杭州网策通信技术有限公司 | Indoor distribution system antenna feeder monitoring method |
-
2014
- 2014-10-29 CN CN201410593712.9A patent/CN104348537B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3914693A1 (en) * | 1988-05-05 | 1989-11-16 | Marconi Adret | TWO-STANDARD GENERATOR FOR FREQUENCY CONVERSION, IN PARTICULAR FOR A MADE-TO-BE TELEVISION NETWORK |
| CN101047421A (en) * | 2006-04-28 | 2007-10-03 | 华为技术有限公司 | Device and method for mobile communication using repeater station |
| CN202503509U (en) * | 2012-02-15 | 2012-10-24 | 京信通信***（中国）有限公司 | Microwave remote system |
| CN103067960A (en) * | 2012-12-17 | 2013-04-24 | 杭州网策通信技术有限公司 | Indoor distribution system antenna feeder monitoring method |
Non-Patent Citations (1)
| Title |
|---|
| 李昌林: "数字微波收发信机（基带、中频）研究", 《中国优秀硕士学位论文全文数据库》 * |
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