New Detection Methods of DS-CDMA Signal at Lower SNR

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Executive Summary

Direct Sequence-Code Division Multiple Access (DS-CDMA) has broad application in the GPS system, low-orbit satellite communication systems, wireless sensor networks and 3G networks. The blind detection of DS-CDMA signals has a major significance on information monitoring and military communication confrontation. Due to its low power spectral density, the Direct Spread Spectrum Sequence (DSSS) signal always floods in the background noise, bringing difficulties to the conventional method. There have been blind detection methods of DSSS, such as double frequency method, correlation detection method, rate-line detection method, cycle-stationary method, spectrum-reprocessing method, cepstrum method and so on.

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