基于喷泉码的强抗干扰跳频传输设计及性能

Transmission Design and Performances of a Strong Anti-Jamming Frequency Hopping System Based on Fountain Codes

针对跳频系统在一半跳频频点失效时系统瘫痪而无法通信,而喷泉码具有无码率、低复杂度、易于硬件实现等优势,考虑将喷泉编码用于强抗干扰跳频通信系统中.本文在对喷泉码编码原理及算法进行深入分析基础上,研究了基于喷泉编码的连续和随机频点部分频带干扰情况下的高效传输和译码性能.Matlab仿真表明,采用高码率LDPC预编码能有效降低译码开销.此外,还给出了一些重要结论以及译码参数计算公式,对实际跳频系统具有重要的指导意义.

When half of the carriers of a frequency hopping system fails, the system will be paralyzed and unable to realize communication. The characteristics of fountain codes of rateless, low complexity and easy to implement for hardware have been widely applied. Thus, fountain codes can be applied to combat strong jamming and interferences. After in-depth analysis for fountain codes and its decoding algorithms, it is found that the transmission efficiency of fountain codes were influenced under partial band interferences i. e. the sequential and random frequency interferences were discussed. Simulations show that using high data rate LDPC precocling overhead can effectively reduce the decoding cost. Some essential conclusions about the decoding and its parameters were presented, and also some important guidances were given for the actual frequency hopping systems.