A Detection Method of DS-CDMA Signal Based on the Quadratic Fourth-order Moment Chip

Abstract

DS-CDMA in the modern civil and military communications is widely used. Due to its low power spectral density, the DS-CDMA signal always floods in the background noise, bringing difficulties to the signalpsilas reconnaissance. Therefore, DS-CDMA signal detection has attracted attention of researchers. Because the fourth-order moment chip is blind to the arbitrary Gaussian noise, the detection method based on the quadratic fourth-order moment chip of DS-CDMA is proposed. The proposed method can reduce the estimation error and computation complexity. Experimental results show that the detection performance of the method is better than that of the double frequency method, spectrum-reprocessing method and cepstrum method. When the false alarm probability is 1%, the detection probability of presented methods reaches above 90% at SNR -24dB.