短波低速数据传输关键技术

摘要

To meet the request of military communication in severe environment, a scheme for DS-8PSK HF low-speed data transmission is designed. On the transmitting end, m-ary orthogonal spread spectrum is used to resolve the contradiction between the bandwidth and the data transmission velocity, and a composite spreading sequence is designed to improve the antijamming capacity of the systemj on the receiving end, an improved Rake receiver is designed to achieve diversity reception and enhance the ability of anti-multipath fading. The data transmission system is simulated and tested with Matlab. The simulation results indicate that the scheme is effective.%针对恶劣环境下的军事通信需求,设计了一个直扩-八进制相移键控(DS-8PSK)短波低速数据传输方案.在发送端,用多进制正交扩频来解决频带与信息传输速率之间的矛盾,设计了一个复合扩频序列提高系统抗干扰性,在接收端,设计了一种改进型Rake接收机来实现分集接收,提高了系统抗多径衰落的能力.最后,用Matlab对数传系统的性能进行仿真验证,仿真结果验证了该方案的有效性.