基于DSSS信號相位特性的參數(shù)估計
A Novel Parameter Estimation Approach to the DS-SS Signal with Low Signal Noise Ratio
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摘要: 利用DS-SS信號符號間相位信息,提出了一種可工作于低信噪比下的直接序列擴譜(DS-SS)信號噪聲抑制方法.該方法在相參積累抑制噪聲的同時,還完整地保留了信號特征,并實現(xiàn)QPSK信號的I/Q分量分離.結(jié)合參數(shù)估計方法,可進行DS-SS信號載頻和碼速率估計.計算機仿真證明了該方法的有效性.Abstract: By exploring the phase information among symbols of the Direct Sequence Spread Spectrum （DS-SS） signal, a novel de-noising approach, used in low signal noise ratio environment, is presented. By coherent integration, this method can fully retain the signal characters and separate I/Q components of the QPSK signal while restraining noise. Combined with conventional parameter estimation methods, the carrier frequency and chip rate of the DS-SS signal can be estimated. Computer simulation confirms its effectiveness.
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