短波低速数传系统扩频序列设计

摘要

扩频序列的设计是短波扩频体制数传系统的关键技术之一。介绍了短波扩频体制的数传系统模型．针对该系统中扩频序列的设计要求，研究了walsh序列和m序列的原理和构造方法，并利用这2种序列的优点，设计了一个新的复合序列。对walsh序列、m序列和新的复合序列的自相关性和互相关性进行了MATLAB仿真，通过对仿真结果的比较，得出该复合序列具有较好的相关特性，因此更能满足通信的需求。%Design of spread spectrum sequence is one of the key technologies for HF-DS data transmission systems. According to the requirements for design of spread spectrum sequences, this paper introduces HF - DS data transmission , studies the principle and constructing means of walsh and m sequences, then designs a new complex sequence. The correlation of above sequences is simulated by MATLAB. By comparing the simulation results, the paper reaches the conclusion that the correlation of the complex sequence is better, which can satisfy the requirement of communication.