CN101399595A - GSM repeater uplink noise suppressing method based on baseband signal processing - Google Patents
GSM repeater uplink noise suppressing method based on baseband signal processing Download PDFInfo
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- CN101399595A CN101399595A CNA2008102259369A CN200810225936A CN101399595A CN 101399595 A CN101399595 A CN 101399595A CN A2008102259369 A CNA2008102259369 A CN A2008102259369A CN 200810225936 A CN200810225936 A CN 200810225936A CN 101399595 A CN101399595 A CN 101399595A
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Abstract
The invention relates to a method for suppressing uplink noise of a GSM repeater based on baseband signal processing. Signal amplitudes of various channels are calculated according to the baseband signals, occupation conditions of various channels are decided by decision algorithm according to the calculation results, and at last the closing of the channels is decided according the occupation conditions. When a channel is not occupied, the channel is closed, which avoids the uplink noise entering a donor base station, thus suppressing the interference of the uplink noise of the GSM repeater on the donor base station. The method for suppressing the uplink noise is applicable to repeaters largely used in the GSM cellular network based on the digital intermediate frequency mode.
Description
Technical field
The present invention relates to a kind of GSM repeater uplink noise suppressing method based on base band signal process, this method is applicable to a large amount of repeaters based on digital intermediate frequency mode of using in the present GSM Cellular Networks.
Background technology
GSM is most widely used general, network size is maximum, the user is maximum a kind of technical standard in the second generation mobile communication system.It adopts time division multiple access (TDMA) technology, and this technology has formed a matrix on frequency-time relationship, and each channel is corresponding to a point on its frequency-time matrix.
GSM digital intermediate frequency mode repeater transforms to analog if signal through Receiver Module earlier with user's upward signal, after the ADC sampling, be converted to digital medium-frequency signal, again baseband signal is arrived in the digital medium-frequency signal Digital Down Convert, baseband signal is handled after (filtering, packing zoom out etc.) Digital Up Convert again to digital medium-frequency signal again, be converted to analog if signal through DAC, launch after transforming to radio frequency by radiofrequency emitting module at last.
GSM digital intermediate frequency mode repeater is the same with the traditional analog repeater, the upstream noise of self also can be introduced into donor base station, thereby reduce the receiving sensitivity of donor base station receiver, influence to network is that up coverage is diminished, also can make base station alarm when serious, even base station receiver be blocked and can't operate as normal.The factor that influences up output noise power has two: noise factor and complete machine gain, these two factors are to be mutually related, in use present actual repeater, generally be to make upstream noise be controlled in the zone of reasonableness that can accept the base station by turning up gain down, but the link balance when this method is difficult to reach high-power output.
Mainly introduce by up link the interference of donor base station the repeater.By analysis to upward signal, obtain the occupied information of channel, according to the break-make of the occupied information of channel control up link, can suppress the interference that the upstream noise of repeater produces effectively.
Summary of the invention
The invention provides a kind of GSM repeater uplink noise suppressing method based on base band signal process, this method is applicable to various digital intermediate frequency mode GSM repeater.By this method when guaranteeing the repeater operate as normal, can eliminate of the influence of GSM direct end uplink noise to donor base station, thereby improved the channel utilization of donor base station, under the situation of interference base station not, realized the uplink downlink balance of high-power output situation easily.
The technical solution adopted in the present invention:
A kind of GSM repeater uplink noise suppressing method based on base band signal process is characterized in that, comprising:
(A) user antenna receives the upward signal from user terminal, by the portable terminal duplexer, is input to Receiver Module, and Receiver Module is converted to analog if signal with upward signal;
(B) analog if signal is carried out the A/D sampling, obtain digital medium-frequency signal, baseband signal is arrived in the digital medium-frequency signal Digital Down Convert;
(C) range value that calculates each frequency signal according to the baseband I signal and the baseband Q signal of each channel;
(D) range value that calculates and threshold value are compared whether adjudicate this channel occupied;
(E) result according to judgement determines whether allowing the signal of this channel to pass through;
(F) when the result of judgement passes through for the signal that allows this channel, the baseband signal Digital Up Convert to digital medium-frequency signal, is carried out D/A with digital medium-frequency signal and handled, obtain analog if signal;
(G) with analog if signal input radio frequency transmitter module, radiofrequency emitting module output radiofrequency signal sends to donor base station through alms giver's terminal duplexer and donor antenna.
Wherein, between the range value of the size of described threshold value range value of making an uproar the end of at and useful signal.
Preferably, the size of the described threshold value range value of as far as possible making an uproar the end of near.
The described range value that calculates and threshold value are compared adjudicated this channel whether occupied step is comprised: when the range value that calculates during less than threshold value, adjudicating this channel does not have occupied.
The described range value that calculates and threshold value are compared adjudicated this channel whether occupied step is comprised: when the range value that calculates during greater than threshold value, it is occupied to adjudicate this channel.
A kind of GSM direct end uplink noise suppressing system based on base band signal process, described upstream noise inhibition system comprises: user antenna, portable terminal duplexer, Receiver Module, A/D converter, digital down converter, baseband signal processing module, digital up converter, D/A converter, radiofrequency emitting module, alms giver's terminal duplexer, donor antenna is characterized in that, also comprise the upstream noise control module, described upstream noise control module comprises:
Computing unit, the range value that calculates each frequency signal according to the baseband I signal and the baseband Q signal of each channel;
Decision unit compares with the range value that calculates and threshold value whether adjudicate this channel occupied;
Output unit determines whether allowing the signal of this channel to pass through according to the result who adjudicates.
Wherein, between the range value of the size of described threshold value range value of making an uproar the end of at and useful signal.
Preferably, the size of the described threshold value range value of as far as possible making an uproar the end of near.
The described range value that calculates and threshold value are compared adjudicated this channel whether occupied step is comprised: when the range value that calculates during less than threshold value, adjudicating this channel does not have occupied.
The described range value that calculates and threshold value are compared adjudicated this channel whether occupied step is comprised: when the range value that calculates during greater than threshold value, it is occupied to adjudicate this channel.
The inhibition method that this method realizes than present analog form, have 1) low cost: all functions can realize with software, do not need to use modules such as frequency-selecting, detection to carry out channel separation and judgement, do not need to use radio-frequency (RF) switch to carry out the chain way switch yet; 2) suppress effective, closing on the baseband signal is more thorough than closing on the analog form;
Description of drawings
Fig. 1 is the system diagram of the GSM repeater of prior art;
Fig. 2 is the structure chart of GSM digital intermediate frequency mode direct end uplink link of the present invention;
Fig. 3 is the structure chart of upstream noise control module of the present invention.
Wherein:
1: donor antenna;
2: user antenna;
3: alms giver's terminal duplexer;
4: the portable terminal duplexer;
5: the upstream noise control module;
11: descending low noise amplifier;
12: digital intermediate frequency frequency-selecting module;
13: downlink power amplifier;
21: the ascending power amplifier;
22: digital intermediate frequency frequency-selecting module;
23: up low noise amplifier;
24: radiofrequency emitting module;
The 25:D/A transducer;
26: digital up converter;
27: baseband signal processing module;
28: digital down converter;
The 29:A/D transducer;
20: Receiver Module;
51: computing unit;
52: decision unit;
53: output unit;
Embodiment
The GSM direct discharging station of prior art as shown in Figure 1, donor antenna enters down link by the downstream signal of the donor base station that wireless network receives through the duplexer high pass, at first amplify through descending low noise amplifier, carry out carrier wave frequency-selecting and downlink power amplifier power amplification by digital intermediate frequency frequency-selecting module again, through the duplexer high pass, be emitted to portable terminal by user antenna at last.
In like manner, the upward signal of portable terminal emission, receive by wireless network by user antenna, after the duplexer low pass, amplify by up low noise amplifier, carry out carrier wave frequency-selecting and the amplification of ascending power booster output by digital intermediate frequency frequency-selecting module again, after the duplexer low pass, send back donor base station by donor antenna through wireless network at last.
For the upstream noise that prevents GSM digital intermediate frequency mode repeater is introduced into donor base station, thereby reduce the receiving sensitivity of donor base station receiver, the present invention proposes a kind of based on the GSM repeater uplink noise suppressing method that baseband signal is handled, the up link of GSM digital intermediate frequency mode repeater as shown in Figure 2, comprise user antenna, portable terminal duplexer, Receiver Module, A/D converter, digital down converter, baseband signal processing module, digital up converter, D/A converter, radiofrequency emitting module, alms giver's terminal duplexer, donor antenna, the upstream noise control module.
Described upstream noise control module is used for baseband signal is handled, and determines whether to allow the signal of this channel pass through according to baseband I signal and baseband Q signal.As shown in Figure 3, the upstream noise control module comprises: computing unit, the range value that calculates each frequency signal according to the baseband I signal and the baseband Q signal of each channel; Decision unit compares range value and the threshold value that calculates, and whether adjudicate this channel occupied; And output unit, determine whether allowing the signal of this channel pass through according to the result who adjudicates.
Between the range value that the size of described threshold value was made an uproar the end of at and the range value of useful signal.Preferably, the size of the described threshold value range value of as far as possible making an uproar the end of near.
The described range value that calculates and threshold value are compared adjudicated this channel whether occupied step is comprised: when the range value that calculates during less than threshold value, adjudicating this channel does not have occupied; When the range value that calculates during greater than threshold value, it is occupied to adjudicate this channel.
The present invention is based on the course of work of GSM digital intermediate frequency mode direct discharging station, comprise the signals transmission of up link.
The signals transmission of described up link is:
(A) user antenna receives the upward signal from user terminal, by the portable terminal duplexer, is input to Receiver Module, and Receiver Module is converted to analog if signal with upward signal;
(B) analog if signal is carried out the A/D sampling, obtain digital medium-frequency signal, baseband signal is arrived in the digital medium-frequency signal Digital Down Convert;
(C) range value that calculates each frequency signal according to the baseband I signal and the baseband Q signal of each channel;
(D) range value that calculates and threshold value are compared whether adjudicate this channel occupied;
(E) result according to judgement determines whether allowing the signal of this channel to pass through;
(F) when the result of judgement passes through for the signal that allows this channel, the baseband signal Digital Up Convert to digital medium-frequency signal, is carried out D/A with digital medium-frequency signal and handled, obtain analog if signal;
(G) with analog if signal input radio frequency transmitter module, radiofrequency emitting module output radiofrequency signal sends to donor base station through alms giver's terminal duplexer and donor antenna.
Between the range value that the size of described threshold value was made an uproar the end of at and the range value of useful signal.Preferably, the size of the described threshold value range value of as far as possible making an uproar the end of near.
The described range value that calculates and threshold value are compared adjudicated this channel whether occupied step is comprised: when the range value that calculates during less than threshold value, adjudicating this channel does not have occupied; When the range value that calculates during greater than threshold value, it is occupied to adjudicate this channel.
The present invention is on the basis that guarantees the normal operation in GSM digital intermediate frequency mode repeater, utilize the upstream noise control module, control the interference of direct end uplink noise to donor base station, the present invention controls the control of the break-make or the uplink gain of up link by the situation that takies of the channel of each carrier frequency.When the channel of up link is occupied, keep up link to open, guarantee the proper communication of mobile subscriber and donor base station; When the channel of up link is unoccupied, disconnect up link, avoid the upstream noise of repeater to be introduced into donor base station.
Claims (10)
1, a kind of GSM repeater uplink noise suppressing method based on base band signal process is characterized in that, comprising:
(A) user antenna receives the upward signal from user terminal, by the portable terminal duplexer, is input to Receiver Module, and Receiver Module is converted to analog if signal with upward signal;
(B) analog if signal is carried out the A/D sampling, obtain digital medium-frequency signal, baseband signal is arrived in the digital medium-frequency signal Digital Down Convert;
(C) range value that calculates each frequency signal according to the baseband I signal and the baseband Q signal of each channel;
(D) range value that calculates and threshold value are compared whether adjudicate this channel occupied;
(E) result according to judgement determines whether allowing the signal of this channel to pass through;
(F) when the result of judgement passes through for the signal that allows this channel, the baseband signal Digital Up Convert to digital medium-frequency signal, is carried out D/A with digital medium-frequency signal and handled, obtain analog if signal;
(G) with analog if signal input radio frequency transmitter module, radiofrequency emitting module output radiofrequency signal sends to donor base station through alms giver's terminal duplexer and donor antenna.
2, the method for claim 1 is characterized in that, between the range value that the size of threshold value was made an uproar the end of at and the range value of useful signal.
3, method as claimed in claim 2 is characterized in that, the range value that the size of threshold value is made an uproar the end of near as far as possible.
4, the method for claim 1 is characterized in that, the described range value that calculates and threshold value are compared adjudicated this channel whether occupied step is comprised: when the range value that calculates during less than threshold value, adjudicating this channel does not have occupied.
5, the method for claim 1 is characterized in that, the described range value that calculates and threshold value are compared adjudicated this channel whether occupied step is comprised: when the range value that calculates during greater than threshold value, it is occupied to adjudicate this channel.
6, a kind of GSM direct end uplink noise suppressing system based on base band signal process, described upstream noise inhibition system comprises: user antenna, portable terminal duplexer, Receiver Module, A/D converter, digital down converter, baseband signal processing module, digital up converter, D/A converter, radiofrequency emitting module, alms giver's terminal duplexer, donor antenna is characterized in that, also comprise the upstream noise control module, described upstream noise control module comprises:
Computing unit, the range value that calculates each frequency signal according to the baseband I signal and the baseband Q signal of each channel;
Decision unit compares with the range value that calculates and threshold value whether adjudicate this channel occupied;
Output unit determines whether allowing the signal of this channel to pass through according to the result who adjudicates.
7, system as claimed in claim 6 is characterized in that, between the range value that the size of threshold value was made an uproar the end of at and the range value of useful signal.
8, system as claimed in claim 7 is characterized in that, the range value that the size of threshold value is made an uproar the end of near as far as possible.
9, system as claimed in claim 6 is characterized in that, the described range value that calculates and threshold value are compared adjudicated this channel occupied comprising whether: when the range value that calculates during less than threshold value, adjudicating this channel does not have occupied.
10, system as claimed in claim 6 is characterized in that, the described range value that calculates and threshold value are compared adjudicated this channel occupied comprising whether: when the range value that calculates during greater than threshold value, it is occupied to adjudicate this channel.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008102259369A CN101399595A (en) | 2008-11-07 | 2008-11-07 | GSM repeater uplink noise suppressing method based on baseband signal processing |
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| CNA2008102259369A CN101399595A (en) | 2008-11-07 | 2008-11-07 | GSM repeater uplink noise suppressing method based on baseband signal processing |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101977426A (en) * | 2010-10-26 | 2011-02-16 | 三维通信股份有限公司 | Method for reducing uplink noise of GSM (Global System for Mobile Communications) digital repeater |
| CN102196536A (en) * | 2010-03-17 | 2011-09-21 | 鼎桥通信技术有限公司 | Method for realizing signal scanning and analysis by utilizing base station |
| CN101594710B (en) * | 2009-07-09 | 2011-09-28 | 上海贝电实业股份有限公司 | Automatic shut-off method for uplink of TD repeater |
| CN101488812B (en) * | 2008-12-23 | 2012-04-25 | 福建先创电子有限公司 | Method and apparatus for eliminating uplink signal noise in GSM digital optical fiber repeater |
| CN106330384A (en) * | 2015-07-09 | 2017-01-11 | 福建澳瀚信息技术有限公司 | Frequency domain blocking type wireless signal blocking device and method |
| CN110927682A (en) * | 2019-11-28 | 2020-03-27 | 航天南湖电子信息技术股份有限公司 | Broadband channel interference classification and identification method |
| CN113949641A (en) * | 2021-09-17 | 2022-01-18 | 合肥润东通信科技股份有限公司 | System and method for analyzing and diagnosing uplink signal noise based on cable modem |
-
2008
- 2008-11-07 CN CNA2008102259369A patent/CN101399595A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101488812B (en) * | 2008-12-23 | 2012-04-25 | 福建先创电子有限公司 | Method and apparatus for eliminating uplink signal noise in GSM digital optical fiber repeater |
| CN101594710B (en) * | 2009-07-09 | 2011-09-28 | 上海贝电实业股份有限公司 | Automatic shut-off method for uplink of TD repeater |
| CN102196536A (en) * | 2010-03-17 | 2011-09-21 | 鼎桥通信技术有限公司 | Method for realizing signal scanning and analysis by utilizing base station |
| CN102196536B (en) * | 2010-03-17 | 2013-07-10 | 鼎桥通信技术有限公司 | Method for realizing signal scanning and analysis by utilizing base station |
| CN101977426A (en) * | 2010-10-26 | 2011-02-16 | 三维通信股份有限公司 | Method for reducing uplink noise of GSM (Global System for Mobile Communications) digital repeater |
| CN101977426B (en) * | 2010-10-26 | 2013-07-10 | 三维通信股份有限公司 | Method for reducing uplink noise of GSM (Global System for Mobile Communications) digital repeater |
| CN106330384A (en) * | 2015-07-09 | 2017-01-11 | 福建澳瀚信息技术有限公司 | Frequency domain blocking type wireless signal blocking device and method |
| CN106330384B (en) * | 2015-07-09 | 2019-03-08 | 福建澳瀚信息技术有限公司 | A kind of frequency domain blocking type wireless signal blocking-up method |
| CN110927682A (en) * | 2019-11-28 | 2020-03-27 | 航天南湖电子信息技术股份有限公司 | Broadband channel interference classification and identification method |
| CN110927682B (en) * | 2019-11-28 | 2021-06-18 | 航天南湖电子信息技术股份有限公司 | Broadband channel interference classification and identification method |
| CN113949641A (en) * | 2021-09-17 | 2022-01-18 | 合肥润东通信科技股份有限公司 | System and method for analyzing and diagnosing uplink signal noise based on cable modem |
| CN113949641B (en) * | 2021-09-17 | 2023-10-27 | 合肥润东通信科技股份有限公司 | System and method for analyzing and diagnosing uplink signal noise based on cable modem |
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Open date: 20090401 |