CN101568175B - Method for implementing frequency selection of GSM frequency selector by using frequency hopping synchronization - Google Patents
Method for implementing frequency selection of GSM frequency selector by using frequency hopping synchronization Download PDFInfo
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- CN101568175B CN101568175B CN2008100528873A CN200810052887A CN101568175B CN 101568175 B CN101568175 B CN 101568175B CN 2008100528873 A CN2008100528873 A CN 2008100528873A CN 200810052887 A CN200810052887 A CN 200810052887A CN 101568175 B CN101568175 B CN 101568175B
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Abstract
The invention relates to a method for implementing frequency selection of a GSM frequency selector by using frequency hopping synchronization, which comprises the following steps: firstly, radio-frequency signals are coupled to a frequency hopping synchronization control module, and frequency hopping synchronization information is obtained; secondly, the frequency hopping synchronization control module changes parameters of a frequency synthesizer according to the frequency point time series, the frequency synthesizer controls voltage controlled oscillators, and the voltage controlled oscillators output intrinsic signals; thirdly, the frequency hopping synchronization control module controls a switch at a time slot among GSM frames to switch between the two voltage controlled oscillators so as to output different intrinsic signals to be provided for intrinsic input ports of an upper mixer and a lower mixer so that the GSM frequency selector selectively receives the radio-frequency signals. The invention can improve the wireless network quality, effectively reduces the interference to a base station and the interference among the frequency points, improves the use reliability and has stronger practicability.
Description
Technical field
The invention belongs to communication technical field, especially a kind of method of using frequency hopping to realize the frequency-selecting of GSM frequency-selector synchronously.
Background technology
At present along with the expansion of GSM digital mobile communication network capacity, in many areas, it is more and more nervous that frequency resource becomes, and with the fixed frequency emission with accept short-wave signal regular meeting and run into the channel block problem.A kind of method that solves the nervous problem of said frequencies resource at present is for adopting the channeling technology, can greatly alleviate frequency resource contradiction in short supply, increase number of users and power system capacity greatly, from distributing, limited original frequency produces almost unlimited usable frequency, it is the excellent way of realization system limitless volumes, but the interference problem of this method between also can the frequency of occurrences causes the deterioration of network quality, therefore normally introduces frequency hopping and addresses the above problem.
Frequency hopping is one of the most frequently used spread spectrum mode, and specifically it is a kind of carrier frequency of receiving-transmitting sides transmission signals is carried out Discrete Change according to predetermined rule a communication mode.Utilize the frequency diversity of frequency hopping and the characteristics of interference diversity, can improve network quality, reduce artificial disturbance, strengthen the fail safe of using, and under the soft congested situation about not rising of network, can guarantee littler channeling degree, reduce influence again as far as possible network quality.The GSM network optimization equipment, particularly trunking are indispensable in network as the important supplement of GSM networking base station, because frequency hopping is introduced in the base station, so in networking, the radiofrequency signal trunking also must adapt to frequency hopping.At present at the base station of using frequency hopping, trunking can't obtain accurate frequency hopping Synchronization Control, also can't change with the variation of base station signal frequency, usually adopt all frequencies that participate in frequency hopping are all amplified simultaneously, thereby influenced the effect that the GSM network uses frequency hopping, making to disturb between the frequency increases, and can influence the operate as normal of base station uplink downlink when serious.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of and can improve quality of wireless network, effectively reduce the interference between base station interference and the frequency, the use frequency hopping that improves dependability realizes the method for GSM frequency-selector frequency-selecting synchronously.
The present invention solves its technical problem and is achieved through the following technical solutions:
A kind of method of using frequency hopping to realize the frequency-selecting of GSM frequency-selector synchronously, comprising following steps:
(1). radiofrequency signal is coupled to frequency hopping synchronization control module, and frequency hopping synchronization control module obtains the frame head precise time and the employed frequency of the GSM frame of base station Frequency Hopping Signal, and obtains accurate radiofrequency signal frequency hopping frequency time series;
(2). frequency hopping synchronization control module changes the frequency synthesizer parameter according to the frequency time series, and the frequency synthesizer controls voltage controlled oscillator is by voltage controlled oscillator output local oscillation signal;
(3). frequency hopping synchronization control module is at the time slot of GSM interframe, control switch, between two voltage controlled oscillators, switch the different local oscillation signal of output, local oscillation signal offers the local oscillator input port of upper frequency mixer and down-conversion mixer simultaneously, down-conversion mixer becomes the input port that intermediate-freuqncy signal outputs to filter with local oscillation signal, filter carries out Filtering Processing to intermediate-freuqncy signal and outputs to upper frequency mixer, upper frequency mixer is reduced to local oscillation signal with intermediate-freuqncy signal, realizes that the GSM frequency-selector passes through the selectivity of radiofrequency signal.
And described GSM frequency-selector is provided with N path, and the span of N is 1≤N≤64.
And described frequency hopping synchronization control module is CETP100.
Advantage of the present invention and beneficial effect are:
1. this use frequency hopping realizes that synchronously the method for GSM frequency-selector frequency-selecting adopts frequency hopping synchronization control module can obtain the synchronous of Frequency Hopping Signal accurately, and obtain accurate radiofrequency signal frequency hopping frequency time series, thereby accurately control the frequency synthesizer parameter of GSM frequency-selector, change the local oscillation signal of voltage controlled oscillator output, for realizing that frequency hopping provides safeguard synchronously.
2. this use frequency hopping realizes that synchronously the method for GSM frequency-selector frequency-selecting adopts the time slot of frequency hopping synchronization control module in GSM interframe, control switch, between two voltage controlled oscillators, switch the different local oscillation signal of output, local oscillation signal offers the local oscillator input port of upper frequency mixer and down-conversion mixer simultaneously, down-conversion mixer becomes the input port that intermediate-freuqncy signal outputs to filter with local oscillation signal, filter carries out Filtering Processing to intermediate-freuqncy signal and outputs to upper frequency mixer, upper frequency mixer is reduced to local oscillation signal with intermediate-freuqncy signal, realizes that the GSM frequency-selector passes through the selectivity of radiofrequency signal.The method makes network optimization trunking can realize the frequency hopping relaying to radiofrequency signal, thereby has significantly reduced the interference to the base station, has reduced the interference between the frequency, has improved the quality of wireless network.
3. the present invention can improve quality of wireless network, effectively reduces the interference between base station interference and the frequency, improves dependability, is the method that the stronger use frequency hopping of a kind of practicality realizes the frequency-selecting of GSM frequency-selector synchronously.
Description of drawings
Fig. 1 is GSM frequency-selector one a paths block diagram;
Fig. 2 is that the GSM frequency-selector is realized the block diagram that frequency hopping is synchronous in the repeater.
Embodiment
The invention will be further described below by specific embodiment, and following examples are descriptive, is not determinate, can not limit protection scope of the present invention with this.
A kind of method of using frequency hopping to realize the frequency-selecting of GSM frequency-selector synchronously, comprising following steps:
(1). radiofrequency signal is coupled to frequency hopping synchronization control module, and frequency hopping synchronization control module obtains the frame head precise time and the employed frequency of the GSM frame of base station Frequency Hopping Signal, and obtains accurate radiofrequency signal frequency hopping frequency time series;
(2). frequency hopping synchronization control module changes the frequency synthesizer parameter according to the frequency time series, and the frequency synthesizer controls voltage controlled oscillator is by voltage controlled oscillator output local oscillation signal;
(3). frequency hopping synchronization control module is at the time slot of GSM interframe, control switch, between two voltage controlled oscillators, switch the different local oscillation signal of output, local oscillation signal offers the local oscillator input port of upper frequency mixer and down-conversion mixer simultaneously, down-conversion mixer becomes the input port that intermediate-freuqncy signal outputs to filter with local oscillation signal, filter carries out Filtering Processing to intermediate-freuqncy signal and outputs to upper frequency mixer, upper frequency mixer is reduced to local oscillation signal with intermediate-freuqncy signal, realizes that the GSM frequency-selector passes through the selectivity of radiofrequency signal.
The said GSM frequency-selector can be provided with N path, and the span of N is 1≤N≤64, and present embodiment accompanying drawing 1 is GSM frequency-selector one a paths schematic diagram.
The concrete application example of the present invention in direct discharging station:
Up low noise amplifier, up GSM frequency-selector, ascending power amplifier constitute up link; Descending low noise amplifier, descending GSM frequency-selector, downlink power amplifier constitute down link, the two ends of uplink and downlink link are connected on respectively on the different port of first duplexer, second duplexer, coupler is connected with first duplexer and frequency hopping synchronization control module, frequency hopping synchronization control module is connected with up GSM frequency-selector, descending GSM frequency-selector respectively, receives/sends out antenna and link to each other by second duplexer; Coupler is coupled to the synchronizing information that frequency hopping synchronization control module obtains the base station Frequency Hopping Signal with a road of the radiofrequency signal that receives, and obtain accurate base station frequency hopping frequency time series, frequency hopping synchronization control module changes frequency synthesizer 1 parameter according to the frequency time series, frequency synthesizer 1 control voltage controlled oscillator 1 is by voltage controlled oscillator 1 output local oscillation signal; Frequency hopping synchronization control module is at the time slot of GSM interframe, control switch, connect voltage controlled oscillator 1, by voltage controlled oscillator 1 output local oscillation signal, this local oscillation signal offers the local oscillator input port of upper frequency mixer and down-conversion mixer simultaneously, down-conversion mixer becomes the input port that intermediate-freuqncy signal outputs to filter with local oscillation signal, filter carries out Filtering Processing to intermediate-freuqncy signal and outputs to upper frequency mixer, upper frequency mixer is reduced to local oscillation signal with intermediate-freuqncy signal, realizes that the GSM frequency-selector passes through the selectivity of radiofrequency signal.Radiofrequency signal through the GSM frequency-selector is launched from antenna by power amplifier and duplexer, and control realizes that frequency hopping is synchronous to the signal that same antenna receives through the GSM frequency-selector.
Above-mentioned radiofrequency signal can be wireless mode from signal of base station, also can be by the signal of wired mode from base station coupling.
Coupler of the present invention is CMTCP900, and frequency hopping synchronization control module is CETP100, and the GSM frequency-selector is H4NCS945.
Claims (3)
1. method of using frequency hopping to realize the frequency-selecting of GSM frequency-selector synchronously is characterized in that: may further comprise the steps:
(1). radiofrequency signal is coupled to frequency hopping synchronization control module, and frequency hopping synchronization control module obtains the frame head precise time and the employed frequency of the GSM frame of base station Frequency Hopping Signal, and obtains accurate radiofrequency signal frequency hopping frequency time series;
(2). frequency hopping synchronization control module changes two frequency synthesizer parameters according to the frequency time series, and two frequency synthesizers are controlled corresponding voltage controlled oscillator respectively, by voltage controlled oscillator output local oscillation signal;
(3). frequency hopping synchronization control module is at the time slot of GSM interframe, control switch, between two voltage controlled oscillators, switch the different local oscillation signal of output, local oscillation signal offers the local oscillator input port of upper frequency mixer and down-conversion mixer simultaneously, down-conversion mixer becomes the input port that intermediate-freuqncy signal outputs to filter with local oscillation signal, filter carries out Filtering Processing to intermediate-freuqncy signal and outputs to upper frequency mixer, upper frequency mixer is reduced to local oscillation signal with intermediate-freuqncy signal, realizes that the GSM frequency-selector passes through the selectivity of radiofrequency signal.
2. use frequency hopping according to claim 1 realizes the method for GSM frequency-selector frequency-selecting synchronously, it is characterized in that: described GSM frequency-selector is provided with N path, and the span of N is 1≤N≤64.
3. use frequency hopping according to claim 1 realizes the method for GSM frequency-selector frequency-selecting synchronously, it is characterized in that: described frequency hopping synchronization control module is CETP100.
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| CN102664673B (en) * | 2012-04-25 | 2014-12-31 | 四川邮科通信技术有限公司 | Digital processing system and method applied to repeater of global system for mobile communication (GSM) frequency hopping network |
| CN107505830A (en) * | 2017-08-31 | 2017-12-22 | 安徽四创电子股份有限公司 | A kind of microwave signal Hopping time measuring circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1691562A (en) * | 2004-04-19 | 2005-11-02 | 北京三星通信技术研究有限公司 | CDMA access method based on orthogonal time-frequency domain with variable spread spectrum and frequency hopping |
| CN1794603A (en) * | 2006-01-12 | 2006-06-28 | 北京飞利信电子技术有限公司 | Radio vote system using frequency hopping communication |
| CN101110607A (en) * | 2006-07-17 | 2008-01-23 | 展讯通信（上海）有限公司 | Frequency hopping communication method for digital non-center communication system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1691562A (en) * | 2004-04-19 | 2005-11-02 | 北京三星通信技术研究有限公司 | CDMA access method based on orthogonal time-frequency domain with variable spread spectrum and frequency hopping |
| CN1794603A (en) * | 2006-01-12 | 2006-06-28 | 北京飞利信电子技术有限公司 | Radio vote system using frequency hopping communication |
| CN101110607A (en) * | 2006-07-17 | 2008-01-23 | 展讯通信（上海）有限公司 | Frequency hopping communication method for digital non-center communication system |
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