TDDM扩频信号的直捕算法研究

Study on Direct Acquisition Method on TDDM Diffused Signals

时分数据调制(TDDM)作为一种新的调制方式受到广泛关注,文中以BOC信号的TDDM调制为例,研究了该调制方式的产生机理及特性.利用其与BOC信号频谱特性的相似性,进而通过研究现有BOC信号捕获算法及其优缺点,结合TDDM扩频方式的特殊性,设计了基于TDDM调制方式的同步捕获算法.对该捕获算法进行建模,并在不同的信噪比条件下,利用MATLAB7.1完成对捕获算法的同步仿真,验证了该直捕算法的可行性和有效性.

As a new modulation fashion, time division data modulation （TDDM） gets extensive attention. With the example of BOC signals＇TDDM modulation, its mechanism and characteristics are studied in this paper. By using its similarity to BOC signal, studying the merits and demerits of BOC signal acquisition algorithms and combining the particularity of TDDM spread frequency fashion, the direct acquisition method is designed on the basis of TDDM modulation signal and simulated in Matlab 7.1. The validity and feasibility of acquisition method are proved in different Signal-to-Noise of received signals.