基于DS-SS信号相位特性的参数估计

A Novel Parameter Estimation Approach to the DS-SS Signal with Low Signal Noise Ratio

利用DS-SS信号符号间相位信息,提出了一种可工作于低信噪比下的直接序列扩谱(DS-SS)信号噪声抑制方法。该方法在相参积累抑制噪声的同时,还完整地保留了信号特征,并实现QPSK信号的I/Q分量分离。结合参数估计方法,可进行DS-SS信号载频和码速率估计。计算机仿真证明了该方法的有效性。

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.