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Method for achieving deep spread spectrum and coherent fast frequency hopping based on DAGC diversity combining

A frequency hopping and spread spectrum technology, applied in the field of anti-interference, can solve the problems of inappropriate, non-coherent demodulation and diversity performance loss, difficult to maintain carrier phase continuity, etc., to improve the signal-to-noise ratio and enhance the anti-interference ability. Effect

Inactive Publication Date: 2013-11-27
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0013] The traditional fast frequency hopping system is difficult to maintain the continuity of the carrier phase when the frequency of the frequency hopping frequency hops, so the traditional fast frequency hopping system mostly uses the non-coherent diversity combination and demodulation method of MFSK. The non-coherent combination brings the non-coherent solution Harmonic and Diversity Merging Performance Loss
In recent years, coherent fast frequency hopping technology has become feasible. For the system combining deep spread spectrum and coherent fast frequency hopping, the traditional non-coherent diversity combining algorithm is no longer suitable.

Method used

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  • Method for achieving deep spread spectrum and coherent fast frequency hopping based on DAGC diversity combining
  • Method for achieving deep spread spectrum and coherent fast frequency hopping based on DAGC diversity combining
  • Method for achieving deep spread spectrum and coherent fast frequency hopping based on DAGC diversity combining

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Embodiment

[0081] The present invention will be further described below in conjunction with an example.

[0082] Assume a BPSK modulation depth spread spectrum and coherent fast frequency hopping hybrid spread spectrum communication system, the source information rate is 20Kbps, the direct spread pseudo code rate is 20Mcps, the frequency hopping rate is 100000hop / s, the total number of frequency hopping points is 2048, and the frequency hopping frequency The point interval is 100KHz. The spread spectrum ratio of the system is 1000, each source information bit has 5 frequency hopping frequency points, and the system sampling rate is 5 times of the symbol rate. For the convenience of discussion, it is assumed that the source sequence length is 32 bits.

[0083] The specific processing steps are as follows:

[0084] Step 1. Coherent fast hop spread signal modulation

[0085] According to the signal modulation process at the transmitter end, it is divided into the following steps:

[008...

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Abstract

The invention relates to a method for achieving deep spread spectrum and coherent fast frequency hopping based on DAGC diversity combining, and belongs to the technical field of interference resistance in spread spectrum digital communication. According to the method, through a coherent digital AGC diversity combining algorithm, for an anti-interference communication system with the deep spread spectrum and the coherent fast frequency hopping combined, the influence on other diversity by interference diversity signals in the coherent combining process is lowered, the signal-to-noise ratio of demodulation signals is improved, and the anti-interference capacity of the system is enhanced.

Description

technical field [0001] The invention relates to a method for realizing deep spectrum spreading and coherent fast frequency hopping based on DAGC diversity combination, and belongs to the technical field of anti-interference in spread spectrum digital communication. Background technique [0002] Spread spectrum communication (referred to as spread spectrum communication) technology has a series of advantages such as strong anti-interference ability, anti-multipath, anti-interception, multiple access multiplexing, good confidentiality, high ranging accuracy and easy networking. According to the different ways of spreading the spectrum, the spread spectrum communication technology mainly includes two ways: Direct Sequence Spread Spectrum (DSSS) and Frequency Hopping Spread Spectrum (FHSS). Direct-sequence spread spectrum technology has shortcomings such as "far-near effect", limited spread spectrum bandwidth, and large targeted interference. Frequency-hopping spread spectrum te...

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Application Information

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IPC IPC(8): H04B1/69H04B1/715H04K3/00
Inventor 刘策伦苏旭韩龙勃文霄杰
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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