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Information Technology Journal

Year: 2011 | Volume: 10 | Issue: 7 | Page No.: 1325-1333
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Authors

Li Dezhi

Gu Xuemai

Guo Qing

Keywords

Research Article

Anti-Detection Performance of Code-Hopping Direct Sequence Spread Spectrum System

Li Dezhi, Gu Xuemai and Guo Qing
In wireless communications especially satellite communications, as blind detection technologies developing, traditional Direct Sequence Spread Spectrum (DSSS) system is no longer secure enough. Code-Hopping (CH) DSSS system is considered as an evolution for its dynamization. CH-DSSS system gets rid of periodical cycle characteristic with its variable and unpredictable spreading sequence. Therefore, CH-DSSS signal is harder to be detected unauthorized. Theoretical analysis and simulations are carried out on both signal parameters and data demodulation. Results indicate that the anti-detection performance of CH-DSSS system improves logarithmically as the number of hopping codes increases. Considering the limited code sequence resource, the performance curve is given, from which a cost-effective codes number could be chosen.
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