CN101883418B - Automatic gain control method of high-speed frequency hopping - Google Patents
Automatic gain control method of high-speed frequency hopping Download PDFInfo
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- CN101883418B CN101883418B CN 201010155832 CN201010155832A CN101883418B CN 101883418 B CN101883418 B CN 101883418B CN 201010155832 CN201010155832 CN 201010155832 CN 201010155832 A CN201010155832 A CN 201010155832A CN 101883418 B CN101883418 B CN 101883418B
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Abstract
The invention discloses an automatic gain control method of high-speed frequency hopping, which comprises the following steps that: a low-speed synchronous signal and a high-speed data communication signal are received by different channels, and the low-speed synchronous signal measures signal power in the process of synchronous receiving and sets an AGC initial value; a baseband demodulates the low-speed synchronous signal, if not, the synchronization fails, then the signal is judged as an interference signal, the AGC initial value is adjusted according to the power of the signal, if the synchronization is successful, the signal is judged as a target signal, and the AGC initial value is adjusted according to the power of the signal; and after the synchronization of the low speed synchronous signal is successful, the channel is switched to the receiving channel of the high-speed data communication signal. The invention improves control accuracy and control speed.
Description
Technical field
The present invention relates to receiver, especially relate to a kind of automatic gain control method of high-speed frequency hopping of receiver.
Background technology
In the existing receiver AGC technology, synchronizing signal and data traffic signals are in same passage, to receive, and are not that subchannel receives.In the receiving course of synchronizing signal, need adjustment AGC.AGC maybe be according to the response of interference signal mistake, and robustness reduces synchronously.For the modulation signal of high peak-to-average force ratio, in signals transmission, adjust AGC, can cause secondary modulation to signal.
In the existing receiver AGC technology, most to fixed communication frequently, can satisfy the needs of arrowband frequency hopping.If be applied to wide interval frequency hopping communication, because the frequency selective attenuation and the high-speed frequency-hopping of channel, intermediate frequency output signal jitter is bigger.
Summary of the invention
The purpose of this invention is to provide a kind of automatic gain control method of high-speed frequency hopping that improves control precision and control rate, solve the AGC control rate problem and the precision problem of broadband high-speed frequency hopping.
In order to achieve the above object, the present invention adopts following technical scheme: a kind of automatic gain control method of high-speed frequency hopping, and its method is:
(1), low-speed synchronous signal and high-speed data communication signal subchannel receive, low-speed synchronous signal is measured signal power in the process that receives synchronously, sets the AGC initial value;
(2), the base band demodulating low-speed synchronous signal, if can not demodulation synchronization failure then, judge that then this signal is an interference signal, with the power adjustment AGC initial value of this signal, if success synchronously then is judged as echo signal, with the power adjustment AGC initial value of this signal;
(3), after the low-speed synchronous signal success synchronously, switch to the receive path of high-speed data communication signal.
The invention has the beneficial effects as follows:
1, low-speed synchronous signal and high-speed data communication signal adopt the different received passage to receive.Guarantee the robustness that communication synchronization is set up.
2, the present invention calculates the AGC initial value according to the power measurement values of " substantial synchronization signal ", has improved control precision.And before data communication, obtained the AGC initial value, faster than the initial value that traditional numerical control AGC obtains, satisfy the time requirement of high-speed frequency-hopping.
3, traditional receiver does not possess the compensation of wideband frequency selective attenuation, can only narrowband applications (can not cross over a plurality of octaves)." broadband " has the frequency selective attenuation problem of space channel.Propagate identical distance, the decay of high-frequency signal is greater than low frequency signal, and traditional AGC broadband reception will produce the problem of signal jitter.This method has solved the problem of broadband signal shake to each frequency independence iterative computation AGC controlled quentity controlled variable;
4, the present invention supports quick user to switch.Need adjustment AGC earlier before the tradition receiver receives synchronously, and the user is switched, and just needs adjustment AGC.Traditional approach synchronizing signal time of reception is longer than this programme.Also promptly solved the near-far problem that far and near user is switched the reception signal of generation.
5, the present invention mainly solves the AGC control rate problem and the precision problem of broadband high-speed frequency hopping.
6, the present invention calculates the AGC initial value according to the power measurement values of " the substantial synchronization signal " measured in the synchronizing process, has improved control precision and control rate, satisfies the time requirement of high-speed frequency-hopping.
7, the present invention is directed to each frequency independence iterative computation AGC controlled quentity controlled variable, solved the wideband frequency selective attenuation and the problem of the signal jitter that causes.
Description of drawings
The present invention will explain through example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is a data communication channel digital AGC scheme block diagram of the present invention.
Embodiment
Disclosed all characteristics in this specification, or the step in disclosed all methods or the process except mutually exclusive characteristic and/or the step, all can make up by any way.
Disclosed arbitrary characteristic in this specification (comprising any accessory claim, summary and accompanying drawing) is only if special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, only if special narration, each characteristic is an example in a series of equivalences or the similar characteristics.
A kind of automatic gain control method of high-speed frequency hopping, its method is:
(1), low-speed synchronous signal and high-speed data communication signal subchannel receive, low-speed synchronous signal is measured signal power in the process that receives synchronously, sets the AGC initial value;
(2), the base band demodulating low-speed synchronous signal, if can not demodulation synchronization failure then, judge that then this signal is an interference signal, with the power adjustment AGC initial value of this signal, if success synchronously then is judged as echo signal, with the power adjustment AGC initial value of this signal;
(3), after the low-speed synchronous signal success synchronously, switch to the receive path of high-speed data communication signal.
Low-speed synchronous signal and high-speed data communication signal adopt the different received passage to receive.In the process that receives synchronously, measure and calculate antenna place signal power.Base band demodulating is also estimated this signal quality.If can not demodulation, synchronization failure then be judged as interference signal, with the power adjustment AGC initial value of this signal; If success then is judged as echo signal synchronously, with the power adjustment AGC initial value of this signal.
After the success, switch to the receive path of data communication synchronously.Use the AGC initial value.In order to guarantee under the high-speed frequency-hopping reliability of data communication.The protection that the AGC adjustment only uses the frequency hopping frequency to switch is accomplished blanking time.That is to say the frequency hopping switching once, AGC upgrades once.
For the space channel frequency selective attenuation of compensating wide band frequency hopping,, revise the adjusted value of AGC to each frequency independence iterative computation AGC controlled quentity controlled variable.Use baseband I Q signal power statistic value, the controlled quentity controlled variable of negative feedback correction long-term communication AGC.
Fig. 1 is a data communication channel digital AGC scheme block diagram, adopts negative feedback structure.Pulse frequently, frequency hopping frequency, synchronizing signal power and baseband I Q power are changed in comprehensive utilization, calculate echo signal power, obtain the control signal of AGC.Hardware using high-speed figure chip, the reaction time is less than 10uS.In practical application, satisfy the high-speed frequency hopping system user demand of 2000 jumping/seconds.This method can be widely used in the frequency-hopping communication system of various frequencies and bandwidth.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature or any new combination that discloses in this manual, and the arbitrary new method that discloses or step or any new combination of process.
Claims (1)
1. automatic gain control method of high-speed frequency hopping is characterized in that its method is:
(1) low-speed synchronous signal and high-speed data communication signal subchannel receive respectively, and low-speed synchronous signal is measured signal power in the process that receives synchronously, set the AGC initial value;
(2) base band demodulating low-speed synchronous signal, if can not demodulation synchronization failure then, judge that then this signal is an interference signal, with the power adjustment AGC initial value of this signal; If success then is judged as echo signal synchronously, with the power adjustment AGC initial value of signal;
(3) after the low-speed synchronous signal success synchronously, switch to the receive path of high-speed data communication signal, use the AGC initial value in the step (2); The protection that said AGC adjustment uses modulation frequency to switch is accomplished blanking time.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101123595A (en) * | 2007-09-03 | 2008-02-13 | 北京天碁科技有限公司 | A method and system for gain calibration of digital receiver channel |
| CN201156809Y (en) * | 2007-08-24 | 2008-11-26 | 深圳哈达讯通信技术有限公司 | Wide-band digital middle -frequency software radio digital cluster base station transceiver |
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| US20040228417A1 (en) * | 2003-05-12 | 2004-11-18 | Mcnc Research And Development Institute | Communication system with adaptive channel correction |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201156809Y (en) * | 2007-08-24 | 2008-11-26 | 深圳哈达讯通信技术有限公司 | Wide-band digital middle -frequency software radio digital cluster base station transceiver |
| CN101123595A (en) * | 2007-09-03 | 2008-02-13 | 北京天碁科技有限公司 | A method and system for gain calibration of digital receiver channel |
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Effective date of registration: 20161128 Address after: 610207 Sichuan Chengdu Shuangliu Economic Development Zone Industrial Zone, Shuangliu District, Sichuan Province Patentee after: CHINA ELECTRONIC TECHNOLOGY CYBER SECURITY CO., LTD. Address before: 610041, No. 6, pioneering Road, hi tech Zone, Sichuan, Chengdu Patentee before: No.30 Inst., China Electronic Science & Technology Group Corp. |