The design of an improved matched filter in DSSS-GMSK system

This paper introduces the principle of DSSS-GMSK system, analyses the superiority of GMSK modulation over MSK modulation. Accord that the method of de-spread before demodulation can effectively improve the capability of the system with spread spectrum gain, this paper researches an improved method w...

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Bibliographic Details
Published inJournal of physics. Conference series Vol. 679; no. 1; pp. 12024 - 12029
Main Authors Wei-tong, Mao, Lin-hua', Zheng, Liang-jun, Xiang, Tan, Wang
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 29.02.2016
Subjects
Demodulation
Matched filters
Modulation
Physics
Spread spectrum
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Summary:This paper introduces the principle of DSSS-GMSK system, analyses the superiority of GMSK modulation over MSK modulation. Accord that the method of de-spread before demodulation can effectively improve the capability of the system with spread spectrum gain, this paper researches an improved method with matched filter to de-spread and demodulate the DSSS signals. The local PN code is modulated with GMSK modulation before being correlated with received signal, then we can get the synchronous PN code, de-spread and demodulate the signal. MATLAB simulation shows that this method is more efficient than the method of demodulation before despread in low SNR environment.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/679/1/012024