CN101567719B - Method for obtaining frequency hopping synchronization by using baseband decoding - Google Patents
Method for obtaining frequency hopping synchronization by using baseband decoding Download PDFInfo
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- CN101567719B CN101567719B CN200810052888A CN200810052888A CN101567719B CN 101567719 B CN101567719 B CN 101567719B CN 200810052888 A CN200810052888 A CN 200810052888A CN 200810052888 A CN200810052888 A CN 200810052888A CN 101567719 B CN101567719 B CN 101567719B
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Abstract
The invention relates to a method for obtaining frequency hopping synchronization by using baseband decoding, which comprises the following steps: firstly, radio-frequency signals of a GSM base station are obtained by a coupler, a baseband decoding module digitally decodes and demodulates the radio-frequency signals of the GSM base station; secondly, the baseband decoding module transmits the information to a micro control unit (MCU); and thirdly, the MCU synchronously maintains frame heads and frequency points through a local clock, thereby obtaining the frequency hopping synchronization synchronizing with the radio-frequency signals of the GSM base station. The invention can effectively improve the wireless network quality, reduces the interference of relay signals to the base station and the interference among the frequency points under GSM frequency hopping, improves the use reliability, has stronger practicability, is suitable for a GSM mobile network optimizing device and can greatly improve the quality of a GSM wireless network.
Description
Technical field
The invention belongs to communication technical field, especially a kind of method of using baseband decoding to obtain frequency hopping synchronization.
Background technology
Present expansion along with 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; When using the quantity showed increased of travelling carriage in the zone, regular meeting runs 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 limited original frequency distributes, produce 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 to the base station of using frequency hopping; Trunking can't obtain accurate frequency hopping synchronization control; Also can't change, adopt usually all frequencies of participating in frequency hopping are all amplified simultaneously, thereby influenced the effect of GSM network use frequency hopping with the variation of base station signal frequency; 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 deficiency of prior art, provide a kind of and can improve quality of wireless network, effectively reduce repeating signal obtains frequency hopping synchronization to the interference between base station interference and the frequency and the use baseband decoding that can improve dependability method.
The present invention solves its technical problem and realizes through following technical scheme:
A kind of method of using baseband decoding to obtain frequency hopping synchronization the steps include:
(1). adopt coupler to obtain GSM base station radio-frequency signal, the baseband decoding module is carried out digital demodulation and decoding to GSM base station radio-frequency signal, with the frame head temporal information of the GSM frame that obtains the base station frequency hopping and the frame information of current GSM frame;
(2). the baseband decoding module sends above-mentioned information to microcontroller, obtains the frame head precise time and the employed frequency of next GSM frame through this microcontroller computing;
(3). microcontroller carries out synchronizing frame head through local clock and frequency is kept, thus the frequency hopping synchronization of acquisition and GSM base station radio-frequency signal Synchronization.
And said GSM base station radio-frequency signal is that wireless mode is from signal of base station, or through the signal of wired mode from base station coupling.
And described baseband decoding module is made up of radio frequency chip and digital baseband chip, or gsm module.
And described coupler is CMTCP900, and microcontroller is arm7 or C8051f.
And described radio frequency chip is QS500, and digital baseband chip is SC6600, and gsm module is U603.
Advantage of the present invention and beneficial effect are:
1. the present invention carries out demodulation and decoding with the radio signal transmission of coupler to the mode of baseband decoding module; Thereby obtain temporal information and the frame information of current GSM frame of the frame head of GSM frame; For the calculating of next step microcontroller has improved the data guarantee, make that frequency hopping control is more accurate.
2. the present invention's frame head precise time and employed frequency of adopting microcontroller to calculate next GSM frame carries out the signal lag compensation; And carry out synchronizing frame head and frequency is kept through local clock; Thereby realize and base station radio-frequency signal frequency hopping synchronization that the method makes network optimization trunking can realize the frequency hopping relaying to the base station radio-frequency signal, thereby has significantly reduced the interference to the base station; Reduce the interference between the frequency, improved the quality of wireless network.
3. the present invention can effectively improve quality of wireless network, reduces repeating signal to the interference between base station interference and the frequency, improves dependability, and practicality is stronger, is applicable to GSM mobile network optimization equipment, can greatly improve the quality of gsm wireless network.
Description of drawings
Fig. 1 is GSM signal frame head of the present invention and protection sketch map at interval;
Fig. 2 realizes the sketch map of frequency hopping control for baseband decoding module of the present invention;
Fig. 3 realizes the sketch map of frequency hopping control for radio-frequency module of the present invention and digital baseband block;
Fig. 4 realizes the sketch map of frequency hopping control for gsm module of the present invention;
Fig. 5 is the application sketch map of the present invention in direct discharging station.
Embodiment
Through specific embodiment the present invention is made further detailed description below in conjunction with accompanying drawing, following examples are descriptive, are not determinate, can not limit protection scope of the present invention with this.
A kind of method of using baseband decoding to obtain frequency hopping synchronization may further comprise the steps:
(1). adopt coupler to obtain GSM base station radio-frequency signal, the baseband decoding module is carried out digital demodulation and decoding to GSM base station radio-frequency signal, with the frame head temporal information of the GSM frame that obtains the base station frequency hopping and the frame information of current GSM frame;
(2). the baseband decoding module sends above-mentioned information to microcontroller (MCU), obtains the frame head precise time and the employed frequency of next GSM frame through this microcontroller computing;
(3). microcontroller carries out synchronizing frame head through local clock and frequency is kept, thus the frequency hopping synchronization of acquisition and GSM base station radio-frequency signal Synchronization.
Above-mentioned baseband decoding module can be made up of radio frequency chip shown in Figure 3 and digital baseband chip, also can be gsm module as shown in Figure 4.
The coupler that the present invention adopted is CMTCP900, and microcontroller is arm7 or C8051f, and radio frequency chip is QS500 or QS1000, and digital baseband chip is SC6600, and gsm module is U603.
Fig. 5 is the concrete applying examples of the present invention in direct discharging station, following mask body narration.
Baseband decoding module and microcontroller MCU constitute frequency hopping control module in the present embodiment, and its formation can draw through operation principle:
GSM base station radio-frequency signal is transferred to the baseband decoding module through coupler with the road signal that is coupled out and carries out demodulation and decoding; Obtain the relevant information of base station frequency hopping; This baseband decoding module is transferred to microcontroller with the frame head temporal information of the GSM frame that obtains after demodulation and the decoding and the frame information of current GSM frame; Analyze above-mentioned information and calculate frame head precise time and the employed frequency of next GSM frame and the signal of time-delay is compensated (like Fig. 1) by microcontroller; And carry out synchronizing frame head and frequency is kept, thereby realize and GSM base station radio-frequency signal frequency hopping synchronization through local clock.
Microcontroller is controlled up frequency-selector, down frequency selection device through control signal, realizes frequency hopping synchronization.Up low noise amplifier, up frequency-selector, ascending power amplifier constitute up link; Descending low noise amplifier, down frequency selection device, downlink power amplifier constitute down link, and the uplink and downlink both link ends is connected on respectively on the different port of first duplexer, second duplexer, receive/send out antenna and link to each other through duplexer.Radiofrequency signal through up frequency-selector is launched from antenna through power amplifier and duplexer, and control realizes frequency hopping synchronization to the signal that same antenna receives through the down frequency selection device.
Said GSM base station radio-frequency signal can be wireless mode from signal of base station, also can be through the signal of wired mode from base station coupling.
Claims (5)
1. method of using baseband decoding to obtain frequency hopping synchronization is characterized in that: may further comprise the steps:
(1). adopt coupler to obtain GSM base station radio-frequency signal, the baseband decoding module is carried out digital demodulation and decoding to GSM base station radio-frequency signal, with the frame head temporal information of the GSM frame that obtains the base station frequency hopping and the frame information of current GSM frame;
(2). the baseband decoding module sends above-mentioned information to microcontroller, obtains frame head precise time and the employed frequency of next GSM frame and the signal of time-delay is compensated through this microcontroller computing;
(3). microcontroller carries out synchronizing frame head through local clock and frequency is kept, thus the frequency hopping synchronization of acquisition and GSM base station radio-frequency signal Synchronization.
2. use baseband decoding according to claim 1 obtains the method for frequency hopping synchronization, it is characterized in that: said GSM base station radio-frequency signal be wireless mode from signal of base station, or the signal that is coupled from the base station through wired mode.
3. use baseband decoding according to claim 1 obtains the method for frequency hopping synchronization, and it is characterized in that: described baseband decoding module is made up of radio frequency chip and digital baseband chip, or gsm module.
4. use baseband decoding according to claim 1 obtains the method for frequency hopping synchronization, and it is characterized in that: described coupler is CMTCP900, and microcontroller is arm7 or C8051f.
5. use baseband decoding according to claim 3 obtains the method for frequency hopping synchronization, and it is characterized in that: described radio frequency chip is QS500, and digital baseband chip is SC6600, and gsm module is U603.
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| CN200810052888A CN101567719B (en) | 2008-04-25 | 2008-04-25 | Method for obtaining frequency hopping synchronization by using baseband decoding |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111211861A (en) * | 2020-01-19 | 2020-05-29 | 成都立鑫新技术科技有限公司 | Signal interference method of mobile terminal |
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| CN106656385B (en) * | 2015-10-29 | 2019-03-05 | 华为技术有限公司 | The method for synchronizing time of eating dishes without rice or wine of relay system, equipment |
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| CN1719781A (en) * | 2005-07-08 | 2006-01-11 | 广州海格通信有限公司 | A kind of Ad hoc network TDMA slotted synchronous method |
| CN101014156A (en) * | 2007-01-22 | 2007-08-08 | 协同智迅通信技术（深圳）有限公司 | Digital cluster communication method with the control channel frequency hopping function |
| CN101018085A (en) * | 2006-12-08 | 2007-08-15 | 北京创毅视讯科技有限公司 | A method and system for providing the digital multi-media broadcast signal |
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Patent Citations (3)
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|---|---|---|---|---|
| CN1719781A (en) * | 2005-07-08 | 2006-01-11 | 广州海格通信有限公司 | A kind of Ad hoc network TDMA slotted synchronous method |
| CN101018085A (en) * | 2006-12-08 | 2007-08-15 | 北京创毅视讯科技有限公司 | A method and system for providing the digital multi-media broadcast signal |
| CN101014156A (en) * | 2007-01-22 | 2007-08-08 | 协同智迅通信技术（深圳）有限公司 | Digital cluster communication method with the control channel frequency hopping function |
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| 帖翊 等.跳频通信同步技术研究.《无线电通信技术》.2001,第27卷(第6期), * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111211861A (en) * | 2020-01-19 | 2020-05-29 | 成都立鑫新技术科技有限公司 | Signal interference method of mobile terminal |
| CN111211861B (en) * | 2020-01-19 | 2023-03-28 | 成都立鑫新技术科技有限公司 | Signal interference method of mobile terminal |
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