CN101754480B - Global system for mobile communication (GSM) repeater and self-adaption interference cancellation method thereof - Google Patents
Global system for mobile communication (GSM) repeater and self-adaption interference cancellation method thereof Download PDFInfo
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Abstract
The invention discloses a global system for mobile communication (GSM) repeater and a self-adaption interference cancellation method thereof, comprising a donor antenna, an overlay antenna, a radio frequency module, a digital down-conversion module, a digital up-conversion module, a self-adaption interference cancellation module, a physical layer processing module and a high layer processing module. The physical layer processing module and the high layer processing module are connected with the self-adaption interference cancellation module through a parallel data line and a serial control line. The self-adaption interference cancellation module is respectively connected with the digital down-conversion module and the digital up-conversion module through a serial data and a control line. The radio frequency module is respectively connected with the digital down-conversion module and the digital up-conversion module through a SAM port, and the radio frequency module is connected with the donor antenna and the overlay antenna. In the invention, communication channels between a base station and a mobile station are detected, and narrow-band self-adaption interference cancellation algorithm is carried out on the communication channels, thereby the occurrence of self-excitation is reduced, interference among a plurality of repeater equipment can not occur, and the complexity of installation and debugging of equipment is simultaneously reduced.
Description
Technical field:
The present invention relates to the adaptive interference cancelling technology in wireless relay field; Relating in particular to a kind of gsm communication that is used for carries out the selectivity amplification, transmits uplink and downlink signals; Utilize the narrowband self-adaption interference cancellation method to eliminate the technology of self-excitation problem simultaneously, belong to wireless communication field.
Background technology:
The repeater is to be mainly used in the weak excessively area of base station signal, plays the wireless relay apparatus of signal humidification.Amplify the repeating base station signal through the repeater, can enlarge base station range effectively, fill coverage hole.The repeater is the duplexing repeater of a transmitted in both directions simultaneously, and one the tunnel receives base station signal, after amplifying, is forwarded to travelling carriage; The signal of another road receiving mobile is forwarded to the base station after amplifying.The repeater operation principle is as shown in Figure 1.
In modern times in the GSM; The repeater is the effective scheme that enlarges the communication network covering power; Compare with the base station, it has simple in structure, small investment, advantage such as easy for installation, can be widely used in base station coverage hole or weak district; Like places such as elevator, subway, tunnel, parking lot, skyscrapers, to improve problems such as communication quality, solution call drop.At present, the transmission signals branch is pressed in the repeater, and GSM repeater, CDMA repeater, 3G repeater etc. are arranged; By the transmission means branch, wireless discharging-directly station and optical fiber repeater are arranged, wherein wireless discharging-directly station divides wireless intra-frequency repeater and wireless frequency-shift repeater again.
As shown in Figure 2, wireless intra-frequency repeater is to resend away after the signal of receiving is amplified, and the signal that donor antenna receives is consistent with the signal frequency that cover antenna is launched again, and the equipment that is characterized in is simple.But make noise increase, cause interference easily; Thereby influence the sensitivity of base station, in addition, the space isolation that needs between donor antenna and the cover antenna is difficult to realize; If Installation and Debugging are improper or donor antenna and cover antenna isolation are not high, will cause self-excitation.Present wireless intra-frequency repeater is mainly used in remote districts or indoor zone among a small circle.Wireless frequency-shift repeater is made up of a near-end machine and some remote terminations, and is therefore less demanding to space isolation because dual-mode antenna adopts different frequency, but its cost is high, also needs the outer frequency resource of occupying volume simultaneously.Along with being widely used of wireless intra-frequency repeater and wireless frequency-shift repeater, also can interfere with each other between the repeater, influence signal quality, cause that the call drop phenomenon is frequent, the access success rate is low, thereby influence the normal operation of whole network.Optical fiber repeater is that base station signal is sent to far-end through optical fiber; Amplifying emission again after opto-electronic conversion; Its advantage is an air interference of having avoided wireless discharging-directly station to cause; Do not exist donor antenna and cover antenna between the isolation problem, shortcoming is to consider delay problem, equipment manufacturing cost is also high.
Summary of the invention:
The purpose of this invention is to provide a kind of new method that is different from the solution cellular cell covering problem of traditional GSM repeater; At first receive the signal of communication between base station and the travelling carriage; Confirm the communication channel between base station and the travelling carriage through analyzing signaling; Only on these channels, carry out the self-adaption interference cancellation method of arrowband then, just can eliminate the self-excitation problem, reduce to disturb.
The objective of the invention is to overcome the shortcoming of above-mentioned prior art; A kind of GSM is provided the repeater, comprises donor antenna, cover antenna, radio-frequency module, Digital Down Converter Module, Digital Up Convert module, adaptive interference cancelling module, physical layer process module and high-rise processing module; Physical layer processing module is connected with the Serial Control line through parallel data line with the adaptive interference cancelling module with high-rise processing module; Said adaptive interference cancelling module is connected with the Digital Up Convert module with Digital Down Converter Module respectively with control line through serial data; Said radio-frequency module is connected with the Digital Up Convert module with Digital Down Converter Module respectively through the SMA mouth, and said radio-frequency module is connected with donor antenna and cover antenna; Said donor antenna is responsible for and base station interactive communication signal, and said cover antenna is responsible for and travelling carriage interactive communication signal.
Said radio-frequency module is used for the radiofrequency signal of communication is down-converted to analog if signal or analog if signal is up-converted to radiofrequency signal; Digital Down Converter Module is used for the analog if signal down-conversion and is the several baseband signal along separate routes; The Digital Up Convert module is used for the several baseband signal is closed the road and up-converted to analog if signal; The adaptive interference cancelling module is used to accomplish the signal that the self-adaption interference cancellation method of each roadbed band signal will monitor simultaneously and sends to the physical layer process module; The physical layer process module be used for synchronously and demodulate reception to signal, channel-decoding and to numeral up and down frequency-variable module and adaptive interference cancelling module send control signal, high-rise processing module is used for analyzing the information of the relevant channel allocation of signaling and informing the physical layer process module.
The self-adaption interference cancellation method of a kind of GSM repeater, according to following steps:
(1) initialization donor antenna, cover antenna, radio-frequency module, Digital Down Converter Module, Digital Up Convert module, adaptive interference cancelling module, physical layer process module and high-rise processing module; (2) carry out cell selecting; (3) flow process of starting working; (4) repeater soft reboot.
Said step (two) is according to following method:
(a) sending the search frequency by high-rise processing module orders to the physical layer process module; After the physical layer process module received this order, according to frequency of channel selective sequential of gsm protocol regulation, the digital intermediate frequency module was given in the concurrent order of losing one's life; The first via base band working frequency points of base station down signal in the Digital Down Converter Module is disposed frequency for this reason; The physical layer process module receives corresponding baseband signal then, extracts acknowledge(ment) signal intensity indication information wherein, preserves after treatment; The physical layer process module can select next frequency to carry out identical processing then, and preserves corresponding acknowledge(ment) signal intensity indication information, up to measuring all frequencies; The physical layer process module sends to high-rise processing module with these frequency point information and corresponding reception signal strength signal intensity indication information through the measurement report order;
(b) high-rise processing module receives after the physical layer process module sends measurement report; To carry out descending according to the size of received signal intensity indication; Select first frequency and by whether BCCH and synch command send it to the physical layer process module, detect by the physical layer process module whether this frequency is the broadcasting frequency of sub-district;
(c) the physical layer process module can dispose frequency for this reason with the first via base band working frequency points of base station down signal in the Digital Down Converter Module after whether receiving BCCH and synch command; Receive corresponding baseband signal then and carry out synchronous; If represent that then this frequency is the broadcasting frequency of a certain sub-district synchronously, otherwise be not; The physical layer process module through whether high-rise processing module is informed in the BCCH order, continues synchronized result and this cell synchronizing simultaneously;
(d) high-rise processing module receives the synchronized result of physical layer process module, if this frequency is not the broadcasting frequency, then high-rise processing module will be selected another frequency, and whether through BCCH and synch command send to the physical layer process module and carry out synchronously commentaries on classics (c); If this frequency is the broadcasting frequency, then high-rise processing module can be sent snoop command lets the physical layer process module receive the system message of this sub-district;
(e) after the physical layer process module receives snoop command, receive corresponding system message, and send it to high-rise processing module.Whether after high-rise processing module receives, analyzing this sub-district according to the regulation of gsm protocol is that optimum can insert the sub-district, if this sub-district is not that optimum can insert the sub-district, then reselects a frequency and sends synch command to the physical layer process module, changes (c); Otherwise insert this sub-district, and send the broadcasting frequency of ordering to the physical layer process module and carry out the adaptive disturbance inhibition, monitor the RACH of this sub-district simultaneously and it is carried out the adaptive disturbance inhibition this sub-district;
(f) after the physical layer process module receives this order; The adaptive interference cancelling module is controlled the adaptive interference cancelling process that starts corresponding Baseband Channel; Wherein roadbed band working frequency points with travelling carriage upward signal in the Digital Down Converter Module is configured to the RACH frequency and receives its corresponding base-band information simultaneously, and the reception signal strength signal intensity indication information corresponding with it sends to high-rise processing module together after demodulation, decoding.
Said step (three) is according to following method:
(1) after high-rise processing module receives the RACH information that the physical layer process module sends, analyzes and whether should insert the request service at random, if send snoop command then for the physical layer process module corresponding access grant channel is monitored to this;
(2) after the physical layer process module received snoop command, control adaptive interference cancelling module received corresponding information, after demodulation, decoding, sends to high-rise processing module;
(3) information of high-rise processing module analysis reception; Therefrom extract the immediate assignment order of the corresponding random access information that receives before; Obtain the channel information that the base station is distributed to travelling carriage,, then this information is informed the physical layer process module by snoop command with suppressing to order if be allocated successfully;
(4) after the physical layer process module receives corresponding snoop command and suppresses order; A wherein roadbed band working frequency points of base station down signal in the Digital Down Converter Module is configured to corresponding frequency; And a wherein roadbed band working frequency points of travelling carriage upward signal in the Digital Down Converter Module is configured to its corresponding frequency; Open corresponding adaptive interference cancelling module simultaneously and accept the corresponding base-band information of base station down signal, after demodulation, the decoding information is sent to high-rise processing module;
(5) signaling of high-rise processing module analysis reception stops snoop command and stops the inhibition order to this passage of physical layer process module release if the sign off signaling is then sent; If comprise new appointment order in the signaling; Then need to inform the physical layer process module by snoop command and inhibition order; Stop snoop command by transmission simultaneously and discharge passage before with stopping to suppress to order to the physical layer process module; The physical layer process module is revised the receiving channels of respective channel then; On new channel, continue reception, demodulation, the corresponding base-band information of decoding and carry out self-adaption interference cancellation method, up to the sign off of base station and travelling carriage;
(6) as if the sign off of base station and travelling carriage, high-rise processing module can be sent order and given the physical layer process module, with the channel resource release of correspondence, changes (1).
Said step (four) is according to following method: after the start, high-rise processing module is provided with a timer, interrupts if timer produces, and judges then whether current time has travelling carriage to be served, if a period of time of then delaying time is detected again; Otherwise, send the soft reboot order for the physical layer process module, the physical layer process module receives this order back and detects the channel resource that whether discharges, if having, a period of time of then delaying time is detected again; Otherwise, each system parameters of resetting, and send the professional order of accomplishing for high-rise processing module.
The present invention is through the communication channel of base stations detected and travelling carriage; Only on these communication channels, carry out the adaptive interference cancelling algorithm of arrowband then; Thereby reduced the generation of self-excitation, also can not produce the interference between a plurality of repeater equipments, also reduced the complexity of rigging up and debugging simultaneously.
Description of drawings:
Fig. 1 is the operation principle block diagram of existing repeater.
Fig. 2 is the sketch map of the three kinds of transmission meanss in existing repeater.
Fig. 3 is a GSM of the present invention repeater structural representation.
Fig. 4 is the structural representation of embodiment of the invention radio-frequency module.
Fig. 5 is the structural representation of embodiment of the invention Digital Down Converter Module.
Fig. 6 is the structural representation of embodiment of the invention Digital Up Convert module.
Fig. 7 is the structural representation of embodiment of the invention adaptive interference cancelling module.
Fig. 8 is mutual command list (CLIST) between physical layer process module and the high-rise processing module among the present invention.
Embodiment:
Below in conjunction with accompanying drawing the present invention is done and to describe in further detail:
Fig. 3 is the structured flowchart that the present invention discloses a kind of preferred embodiment of GSM repeater and self-adaption interference cancellation method thereof, comprises donor antenna, cover antenna, radio-frequency module, Digital Down Converter Module, Digital Up Convert module, adaptive interference cancelling module, physical layer process module and high-rise processing module; Physical layer processing module is connected with the Serial Control line through parallel data line with the adaptive interference cancelling module with high-rise processing module; Said adaptive interference cancelling module is connected with the Digital Up Convert module with Digital Down Converter Module respectively with control line through serial data; Said radio-frequency module is connected with the Digital Up Convert module with Digital Down Converter Module respectively through the SMA mouth, and said radio-frequency module is connected with donor antenna and cover antenna; Said donor antenna is responsible for and base station interactive communication signal, and said cover antenna is responsible for and travelling carriage interactive communication signal.
Radio-frequency module realizes that block diagram is as shown in Figure 4; Its effect is that the radiofrequency signal that donor antenna and cover antenna receive is down-converted to analog intermediate frequency and sends into Digital Down Converter Module, or will be modulated to corresponding RF spot from the analog if signal of Digital Up Convert module and send through respective antenna.Radio-frequency module has the antenna of two transmission-receiving functions: donor antenna and cover antenna have certain isolation between two antennas, wherein donor antenna and base station interactive communication signal, and cover antenna and travelling carriage interactive communication signal.Donor antenna is connected to duplexer A, and cover antenna is connected to duplexer B, and the working method of two duplexers all is a mode of frequency division duplexing, is used to separate base station down signal and travelling carriage upward signal.The base station down signal that donor antenna receives; Get into low noise amplifier A through duplexer A; Radiofrequency signal down-converts to analog if signal behind frequency mixer A1 and filter A1 then; This analog if signal is admitted to Digital Down Converter Module, after a series of processing, sends radio-frequency module back to through the Digital Up Convert module, and this signal up-converts to radiofrequency signal through frequency mixer A2 and filter A2 with analog if signal then; After power amplifier A, duplexer B launch through cover antenna.The travelling carriage upward signal that receives for cover antenna; It gets into low noise amplifier B through duplexer B; Radiofrequency signal down-converts to analog if signal behind frequency mixer B1 and filter B1 then; This signal is admitted to Digital Down Converter Module equally and after a series of processing, sends radio-frequency module back to through the Digital Up Convert module; This signal up-converts to radiofrequency signal through frequency mixer B2 and filter B2 with analog if signal then, after power amplifier B, duplexer A launch through donor antenna.
Digital Down Converter Module realizes that block diagram is as shown in Figure 5, and its effect is that analog if signal is down-converted to base band, and exports the baseband sampling signal to the adaptive interference cancelling module.Its input is the control signal 2 of physical layer process module, and from the two-way analog if signal of radio-frequency module, is respectively base station down signal and travelling carriage upward signal.Wherein the analog if signal of base station down is sent into A/D sampler 1 behind variable gain amplifier A; Signal after the sampling is a digital medium-frequency signal; Be divided into two-way also obtains corresponding channel respectively behind digital mixer NCO1, NCO2 and digital filter A1, A2 baseband sampling signal; This signal comprises I road, Q road and RSSI (received power index signal) signal, sends into the adaptive interference cancelling module.Equally; The up analog if signal of travelling carriage is sent into A/D sampler 2 behind variable gain amplifier B; Signal after sampling is a digital medium-frequency signal; Be divided into two-way also respectively through obtaining the baseband sampling signal of corresponding channel behind digital mixer NCO3, NCO4 and digital filter B1, the B2, this signal comprises I road, Q road and RSSI (received power index signal) signal, sends into the adaptive interference cancelling module.Wherein the frequency of four digital mixers is passed through control signal 2 respectively by the physical layer process block configuration.
The Digital Up Convert module realizes that block diagram is as shown in Figure 6; Its effect is that four road IQ baseband sampling signals that the adaptive interference cancelling resume module is good close the road and up-convert to the two-way analog if signal; Send into radio-frequency module then, launch through donor antenna and cover antenna respectively.Its input is four road IQ baseband sampling signals from the adaptive interference cancelling module.Its output is the two-way analog if signal, sends into donor antenna respectively and cover antenna is sent by radio-frequency module.In four road IQ baseband sampling signals; Two-way is arranged from the base band downstream signal, respectively behind digital interpolation and filtering A1, A2, be combined into one the tunnel after being modulated to correspondent frequency through digital mixer NCO1, NCO2; Convert analog if signal into through D/A converter 1 then, send into radio-frequency module; Two-way baseband sampling signal is from the travelling carriage upward signal in addition; Respectively behind digital interpolation and filtering B1, B2; Be combined into one the tunnel after being modulated to corresponding frequencies through digital mixer NCO3, NCO4, convert analog if signal into through D/A converter 2 then, send into radio-frequency module.Wherein the frequency of four digital mixers is passed through control signal 3 respectively by the physical layer process block configuration.
The adaptive interference cancelling module is the emphasis in the system, realizes that block diagram is as shown in Figure 7, and its main purpose is the self-excitation of elimination system, and the signal after will receiving, handling sends the physical layer process module to.This module realizes in FPGA; Its input is that its output is to send into physical layer process module and Digital Up Convert module after the baseband sampling signal processing of control signal 1 with respective channel according to the physical layer process module from the four roadbed band sampled signals (comprising I, Q and RSSI signal) of Digital Down Converter Module and from the control signal 1 of physical layer process module.Each roadbed band signal all can be through an interference cancellation algorithm module, this module whether need start with and the output signal whether need send to the physical layer process module by control signal 1 configuration.In addition, in order to guarantee slot synchronization, need a slot timing device module.
For the interference cancellation algorithm module in the adaptive interference cancelling module, it realizes that block diagram is as shown in Figure 7.Normal reception signal is s (n); Simultaneously transmitting antenna transmit for s ' (n) because the isolation problem of reception antenna and transmitting antenna, the power leakage that transmitting antenna has few part arrives reception antenna; Its signal be ks ' (n-n0); N0 is a loop time delay, and k is a loop gain, and then the actual signal that receives of reception antenna is that (n)+ks ' (n-n0) for x (n)=s.Vital task of the present invention is exactly that leakage power in is to received signal estimated and offset.
At first estimate loop time delay; Its method of estimation is following: the pseudo random sequence of storing a GMSK modulation mode at adaptive interference cancelling module place; When sending to the Digital Up Convert module, it receives data; To receive data and mate with the transmission data, the peak value position of getting matching result is the estimation n0_est of loop time delay.
The system handles time delay will be about 10us, and just the length of three code elements can think that the s (n) and the s ' degree of correlation (n) are little.According to minimum mean square error criterion can push away being estimated as of loop gain
Its hardware is realized as shown in Figure 7; Emission data after receiving data and delaying time are carried out related operation; The statistical average process can realize through low pass filter; Obtain after the loop gain k_est and s ' and (n-n0_est) multiply each other and be the estimation that transmitting antenna is leaked to the reception antenna signal, from receive signal, cut the purpose that this value can realize Interference Cancellation.
High-rise processing module is the control centre of system; Main task is to accomplish the analysis of signaling; Inform that physical layer should receive which frame of which frequency in the ensuing time and the logic channel kind of which time slot and each reception piece makes the physical layer process module can select suitable channel decoding de-interweaving method to obtain data link layer packets.
The physical layer process module is mainly accomplished work such as the demodulation, decoding, deinterleaving of level detection, Frequency Synchronization, FCCH detection, time synchronized, channel estimating, reception data.
High-rise processing module and physical layer process module can realize in DSP; Its input is the four roadbed band signals (comprising I, Q and RSSI signal) from the adaptive interference cancelling module; Its output is the control signal that adaptive interference cancelling module and numeral is gone up down conversion module; Control signal 1 to the adaptive interference cancelling module comprises the adaptive interference cancelling algorithm that whether starts respective channel, the baseband signal that whether receives respective channel; And to the adjustment of slot timing device, to numeral up and down the control signal 3,2 of frequency-variable module mainly be the working frequency points of configuration respective channel.
The control signal of physical layer process module adopts 32 serial signal, and through the transmission of SPI transmission means, wherein high 16 is the command id position, and low 16 is command word.
If the command id position in the control signal is 0x01, then represent this order to send to the adaptive interference cancelling module.High two be the command name position in this moment command word, when the command name position is 00b, representes that this order is used to adjust the slot timing device, and wherein hanging down 14 in the command word is slot timing device adjusted value; When the command name position is 01b; Represent that this order is used to control each passage and whether will carries out self-adapting interference suppression method; Wherein low 4 interference that are respectively each passage suppress the position in the command word; Be 1 and represent this passage need carry out the adaptive interference cancelling algorithm, be 0 and represent this passage need not carry out the adaptive interference cancelling algorithm; When the command name position is 10b; Represent that this order is used to control each passage and whether will monitors; Wherein hang down 4 monitoring positions that are respectively each passage in the command word; Be 1 and represent this channel data need receive and send to the physical layer process module, be 0 and represent this channel data need not send to the physical layer process module.The adaptive interference cancelling module will trigger corresponding operation after receiving corresponding command and parsing.
If the command id position in the control signal is 0x02, then represent this order to send to Digital Down Converter Module, it mainly acts on is the working frequency points of each channel mixer of respective chip in the configuration Digital Down Converter Module.This moment command word in high 4 be the gap marker position; Such as; When the gap marker position is that this order of 0001b interval scale sends to passage 1 in the Digital Down Converter Module, low 12 be channel in the command word, according to definite frequency of each channel correspondence of gsm protocol.Digital Down Converter Module can be transferred to the working frequency points of respective channel frequency mixer on the corresponding frequencies after receiving this order.
If the command id position in the control signal is 0x03, then represent this order to send to the Digital Up Convert module, it mainly acts on is the working frequency points of each channel mixer of respective chip in the configuration Digital Up Convert module.Equally, high 4 be the gap marker position this moment in the command word, such as, when the gap marker position is that this order of 0001b interval scale sends to passage 1 in the Digital Up Convert module, hanging down 12 in the command word is channel.The Digital Up Convert module can be transferred to its working frequency points of respective channel mixing on the corresponding frequencies after receiving this order.
In addition, physical layer process module and high-rise processing module need interactive information, and the interactive command tabulation between it is like Fig. 8.The order that the physical layer process module sends to high-rise processing module comprise measurement report, whether broadcasting channel (BCCH), monitor and fail, suppress successfully, suppress failure, professional completion, signaling, measurement report 2.The order that high-rise processing module sends to the physical layer process module comprise the search frequency, whether broadcasting channel (BCCH) and synchronously, soft reboot order, monitors, stops to monitor, suppresses, stops inhibition, the measurement of idle frequency.The concrete form and the brief description thereof of order can be referring to Fig. 8.
The concrete workflow of present embodiment is following:
(1) sending the search frequency by high-rise processing module orders to the physical layer process module; After the physical layer process module received this order, according to frequency of channel selective sequential of gsm protocol regulation, the digital intermediate frequency module was given in the concurrent order of losing one's life; The first via base band working frequency points of base station down signal in the Digital Down Converter Module is disposed frequency for this reason; The physical layer process module receives corresponding baseband signal then, extracts reception signal strength signal intensity indication (RSSI) information wherein, preserves after treatment.The physical layer process module can select next frequency to carry out identical processing then, and preserves corresponding signal strength signal intensity indication (RSSI) information that receives, up to measuring all frequencies.The physical layer process module sends to high-rise processing module with these frequency point information and corresponding reception signal strength signal intensity indication (RSSI) information through the measurement report order.
(2) high-rise processing module receives after the physical layer process module sends measurement report; To carry out descending according to the size that receives signal strength signal intensity indication (RSSI); Select first frequency and through whether BCCH and synch command send it to the physical layer process module, judge by the physical layer process module whether this frequency is the broadcasting frequency of certain sub-district.
(3) the physical layer process module can dispose frequency for this reason with the first via base band working frequency points of base station down signal in the Digital Down Converter Module after whether receiving BCCH and synch command; Receive corresponding baseband signal then and carry out synchronous; If represent that then this frequency is the broadcasting frequency of a certain sub-district synchronously, otherwise be not.The physical layer process module through whether high-rise processing module is informed in the BCCH order, continues synchronized result and this cell synchronizing simultaneously.
(4) high-rise processing module receives the synchronized result of physical layer process module, if this frequency is not the broadcasting frequency, then high-rise processing module will be selected another frequency, and whether through BCCH and synch command send to the physical layer process module and carry out synchronously commentaries on classics (3); If this frequency is the broadcasting frequency, then high-rise processing module can be sent snoop command lets the physical layer process module receive the system message of this sub-district.
(5) after the physical layer process module receives snoop command, receive corresponding system message, and send it to high-rise processing module.Whether after high-rise processing module receives, analyzing this sub-district according to the regulation of gsm protocol is that optimum can insert the sub-district, if this sub-district is not that optimum can insert the sub-district, then reselects a frequency and sends synch command to the processing layer processing module, changes (3); Otherwise insert this sub-district, and send inhibition to the physical layer process module and order broadcasting frequency to carry out the adaptive disturbance inhibition, monitor the RACH (RACH) of this sub-district simultaneously this sub-district.
(6) after the physical layer process module receives this order; The adaptive interference cancelling module is controlled the adaptive interference cancelling process that starts corresponding Baseband Channel; Wherein roadbed band working frequency points with travelling carriage upward signal in the Digital Down Converter Module is configured to the RACH frequency and receives its corresponding base-band information simultaneously, and the reception signal strength signal intensity indication information corresponding with it sends to high-rise processing module together after demodulation, decoding.
(1) after high-rise processing module receives the RACH information that the physical layer process module sends, analyzes and whether should insert the request service at random, if send snoop command then for the physical layer process module access grant channel (AGCH) is monitored to this.
(2) after the physical layer process module received snoop command, control adaptive interference cancelling module received corresponding information, after demodulation, decoding, sends to high-rise processing module.
(3) information of high-rise processing module analysis reception; Therefrom extract the immediate assignment order of the corresponding random access information that receives before; Obtain the channel information that the base station is distributed to travelling carriage,, then this information is informed the physical layer process module through snoop command with suppressing to order if distribute successfully.
(4) after the physical layer process module receives corresponding snoop command and suppresses order; A wherein roadbed band working frequency points of base station down signal in the Digital Down Converter Module is configured to corresponding frequency; And a wherein roadbed band working frequency points of travelling carriage upward signal in the Digital Down Converter Module is configured to its corresponding frequency; Open corresponding adaptive interference cancelling module simultaneously and accept the corresponding base-band information of base station down signal, after demodulation, the decoding information is sent to high-rise processing module.
(5) signaling of high-rise processing module analysis reception stops snoop command and stops the inhibition order to this passage of physical layer process module release if the sign off signaling is then sent; If comprise new appointment order in the signaling; Then need to inform the physical layer process module through snoop command and inhibition order; Stop snoop command through transmission simultaneously and discharge passage before with stopping to suppress to order to the physical layer process module; The physical layer process module is revised the receiving channels of respective channel then, on new channel, continues reception, demodulation, the corresponding base-band information of decoding and carries out self-adaption interference cancellation method, up to the sign off of base station and travelling carriage.
(6) as if the sign off of base station and travelling carriage, high-rise processing module can be sent order and given the physical layer process module, with the channel resource release of correspondence.
Step 4, system's soft reboot.Behind the system boot, high-rise processing module is provided with a timer, interrupts if timer produces, and judges then whether current time has travelling carriage to be served, if a period of time of then delaying time is detected again; Otherwise, send the soft reboot order for the physical layer process module, the physical layer process module receives this order back and detects the channel resource that whether discharges, if having, a period of time of then delaying time is detected again; Otherwise, each system parameters of resetting, and send the professional order of accomplishing for high-rise processing module.High-rise processing module is restarted new flow process from step 1 after receiving the business completion order of physical layer process module transmission.
Above content is to combine concrete preferred implementation to further explain that the present invention did; Can not assert that embodiment of the present invention only limits to this; Those of ordinary skill for technical field under the present invention; Under the prerequisite that does not break away from the present invention's design, can also make some simple deduction or replace, all should be regarded as belonging to the present invention and confirm scope of patent protection by claims of being submitted to.
Claims (3)
1. the self-adaption interference cancellation method of a GSM repeater is characterized in that, according to following steps:
(1) initialization is provided with donor antenna, cover antenna, radio-frequency module, Digital Down Converter Module, Digital Up Convert module, adaptive interference cancelling module, physical layer process module and high-rise processing module; (2) carry out cell selecting; (3) flow process of starting working; (4) repeater soft reboot;
Said step (two) is according to following method:
(a) sending the search frequency by high-rise processing module orders to the physical layer process module; After the physical layer process module received this order, according to frequency of channel selective sequential of gsm protocol regulation, the digital intermediate frequency module was given in the concurrent order of losing one's life; The first via base band working frequency points of base station down signal in the Digital Down Converter Module is disposed frequency for this reason; The physical layer process module receives corresponding baseband signal then, extracts acknowledge(ment) signal intensity indication information wherein, preserves after treatment; The physical layer process module can select next frequency to carry out identical processing then, and preserves corresponding acknowledge(ment) signal intensity indication information, up to measuring all frequencies; The physical layer process module sends to high-rise processing module with these frequency point information and corresponding reception signal strength signal intensity indication information through the measurement report order;
(b) high-rise processing module receives after the physical layer process module sends measurement report; To carry out descending according to the size of received signal intensity indication; Select first frequency and by whether BCCH and synch command send it to the physical layer process module, detect by the physical layer process module whether this frequency is the broadcasting frequency of sub-district;
(c) the physical layer process module can dispose frequency for this reason with the first via base band working frequency points of base station down signal in the Digital Down Converter Module after whether receiving BCCH and synch command; Receive corresponding baseband signal then and carry out synchronous; If represent that then this frequency is the broadcasting frequency of a certain sub-district synchronously, otherwise be not; The physical layer process module through whether high-rise processing module is informed in the BCCH order, continues synchronized result and this cell synchronizing simultaneously;
(d) high-rise processing module receives the synchronized result of physical layer process module, if this frequency is not the broadcasting frequency, then high-rise processing module will be selected another frequency, and whether through BCCH and synch command send to the physical layer process module and carry out synchronously commentaries on classics (c); If this frequency is the broadcasting frequency, then high-rise processing module can be sent snoop command lets the physical layer process module receive the system message of this sub-district;
(e) after the physical layer process module receives snoop command, receive corresponding system message, and send it to high-rise processing module; Whether after high-rise processing module receives, analyzing this sub-district according to the regulation of gsm protocol is that optimum can insert the sub-district, if this sub-district is not that optimum can insert the sub-district, then reselects a frequency and sends synch command to the physical layer process module, changes (c); Otherwise insert this sub-district, and send the broadcasting frequency of ordering to the physical layer process module and carry out the adaptive disturbance inhibition, monitor the RACH of this sub-district simultaneously and it is carried out the adaptive disturbance inhibition this sub-district;
(f) after the physical layer process module receives this order; The adaptive interference cancelling module is controlled the adaptive interference cancelling process that starts corresponding Baseband Channel; Wherein roadbed band working frequency points with travelling carriage upward signal in the Digital Down Converter Module is configured to the RACH frequency and receives its corresponding base-band information simultaneously, and the reception signal strength signal intensity indication information corresponding with it sends to high-rise processing module together after demodulation, decoding.
2. the self-adaption interference cancellation method of a kind of according to claim 1 GSM repeater is characterized in that, said step (three) is according to following method:
(1) whether after high-rise processing module receives the RACH information that the physical layer process module sends, analyzing should be to inserting the request service, if send snoop command then for the physical layer process module corresponding access grant channel is monitored at random;
(2) after the physical layer process module received snoop command, control adaptive interference cancelling module received corresponding information, after demodulation, decoding, sends to high-rise processing module;
(3) information of high-rise processing module analysis reception; Therefrom extract the immediate assignment order of the corresponding random access information that receives before; Obtain the channel information that the base station is distributed to travelling carriage,, then this information is informed the physical layer process module by snoop command with suppressing to order if be allocated successfully;
(4) after the physical layer process module receives corresponding snoop command and suppresses order; A wherein roadbed band working frequency points of base station down signal in the Digital Down Converter Module is configured to corresponding frequency; And a wherein roadbed band working frequency points of travelling carriage upward signal in the Digital Down Converter Module is configured to its corresponding frequency; Open corresponding adaptive interference cancelling module simultaneously and accept the corresponding base-band information of base station down signal, after demodulation, the decoding information is sent to high-rise processing module;
(5) signaling of high-rise processing module analysis reception stops snoop command and stops the inhibition order to this passage of physical layer process module release if the sign off signaling is then sent; If comprise new appointment order in the signaling; Then need to inform the physical layer process module by snoop command and inhibition order; Stop snoop command by transmission simultaneously and discharge passage before with stopping to suppress to order to the physical layer process module; The physical layer process module is revised the receiving channels of respective channel then; On new channel, continue reception, demodulation, the corresponding base-band information of decoding and carry out self-adaption interference cancellation method, up to the sign off of base station and travelling carriage;
(6) as if the sign off of base station and travelling carriage, high-rise processing module can be sent order and given the physical layer process module, with the channel resource release of correspondence, changes (1).
3. the self-adaption interference cancellation method of a kind of according to claim 1 GSM repeater; It is characterized in that; Said step (four) is according to following method: after the start; High-rise processing module is provided with a timer; If producing, timer interrupts; Judge then whether current time has travelling carriage to be served, if a period of time of then delaying time is detected again; Otherwise, send the soft reboot order for the physical layer process module, the physical layer process module receives this order back and detects the channel resource that whether discharges, if having, a period of time of then delaying time is detected again; Otherwise, each systematic parameter of resetting, and send the professional order of accomplishing for high-rise processing module.
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| CN102082597A (en) * | 2010-09-17 | 2011-06-01 | 贾斌 | System and method for carrying out statistics on telephone traffic and drop call rate of GSM (global system for mobile communication) digital repeater |
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| EP2849372A4 (en) * | 2012-05-11 | 2015-05-27 | Fujitsu Ltd | Mobile station and wireless communication method |
| CN102833766B (en) * | 2012-08-02 | 2016-06-01 | 奥维通信股份有限公司 | Based on base station lock fixed system and the method for the continuous carrier wave of CDMA2000 |
| CN103716266B (en) * | 2012-09-29 | 2017-09-12 | 华为技术有限公司 | Signal processing method, apparatus and system |
| CN102984105B (en) * | 2012-11-15 | 2015-06-03 | 奥维通信股份有限公司 | System and method capable of achieving interference offset and basestation locking based on field programmable gate array (FPGA) |
| CN103117794B (en) * | 2013-03-11 | 2015-11-25 | 福建京奥通信技术有限公司 | A kind of radio frequency choosing band repeater of anti-self-excitation interference and the method for minimizing self-excitation interference |
| CN103427874B (en) * | 2013-09-03 | 2015-03-11 | 电子科技大学 | System and method for canceling high-transmission-power same-time same-frequency self-interference under multi-path environment |
| CN103427872B (en) * | 2013-09-03 | 2015-01-21 | 电子科技大学 | Same-time same-frequency full duplex multi-tap radio frequency self-interference offset system and method |
| CN104301367B (en) * | 2014-03-14 | 2017-11-07 | 同济大学 | Communication means between digital multipoint distribution system far-end unit and power amplifier |
| CN107659353A (en) * | 2014-08-29 | 2018-02-02 | 吴红平 | Using the relay transmission system based on short-range communication of bandpass filter |
| CN105827256A (en) * | 2016-04-11 | 2016-08-03 | 河海大学常州校区 | Mobile GSM (Global System for Mobile Communication) and GSM-R (GSM for railways) interference inhibition system and method based on digital filtering |
| CN107484237B (en) * | 2017-09-27 | 2024-03-15 | 北联技术股份有限公司 | Self-adaptive system and method for unbalance of uplink and downlink |
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