窄带通信系统中信道编码系统的改进

Improvement of Channel Coding System in Narrowband Communication System

由于卷积码具有编译复杂度低、易于实现的特点,在目前的实际通信系统中被广泛应用,但一些问题也随之而来。在需要长距离传输、通信质量要求很高的战术通信环境下,使用卷积码需要较高的发射功率,这导致了额外的能量损耗,限制了信息的传输距离,降低了通信系统的性能;而使用高性能信道编码可以在达到相同通信质量的同时降低所需的传输能量,进而改善系统整体性能。因此,通过研究Turbo码和LDPC码的基本原理,并结合实际通信系统的特点设定参数进行仿真,证明了Turbo码和LDPC码与卷积码相比,在相同的通信环境下具有更好的性能,能够有效地提高战术通信系统中信道编码系统的编码效率。

With the advantages of low complexity and easy implementation, convolution code is widely used in practical communication systems. However, the requirement of higher transmission power in tactical environment of long distance transmission and higher quality of communication, results in additional energy loss, limited transmission range and relatively high bit error rate in receiver. High quality channel coding can achieve the same communication quality with lower power consumption, improving the performance of the whole system. So the basic principles of Turbo code and LDPC code were studied. The results of simulation combined with the characteristics of actual communication system, show that Turbo code and LDPC code have better performances than convolution code under the same conditions and could be used to improve the channel coding efficiency in tactical communication system.