DSSS信号在低SNR下的同步捕获算法

Synchronization Acquisition Algorithm for DSSS in Low SNR

同步捕获与信号识别是DSSS系统的关键技术。给出了一种频差与扩频码同步联合捕获的方法,提出了一种基于峰值窗口的噪声与干扰估计算法,基于此估计,在信号识别中采用了相对门限。还对该算法的虚警概率、漏检概率、误捕率性能进行了仿真,为其应用提供了依据。该方法针对二进制DSSS/MPSK系统,但同样也适用于多进制正交扩频系统。

Synchronization acquisition and signal recognition are key technologies in DSSS. A scheme for joint frequency offset and spread spectrum code time delay acquisition was proposed, and the noise and interference estimation algorithm was put forward based on peak windows. Based on the estimation, relative threshold was applied in signal recognition. The performances of the algorithm were simulated, including false detect probability, missed detect probability and false acquisition probability, The useful data for its practical application was provided. The algorithm aims at binary DSSS/MPSK signal, but also can be applicable for m-ary orthogonal spread spectrum system.