LDPC编码跳频抗干扰通信系统建模与仿真分析

为进一步提升跳频卫星通信系统的抗干扰能力,将LDPC信道编码与跳频技术相结合,建立一种基于LDPC码的跳频抗干扰通信系统模型,基于该模型进行了抗干扰性能仿真分析。首先结合BPSK调制方式,建立不同码率、不同码长的LDPC码跳频抗干扰通信系统模型;然后利用该模型,对不同码长、不同码率的LDPC码跳频抗干扰通信系统在不同干扰因子的部分频带干扰条件下进行抗干扰性能仿真,并对仿真结果进行对比分析。研究结果表明,LDPC码跳频抗干扰通信系统模型的仿真结果与理论分析相吻合。通过仿真分析,得到采用不同的编码参数在不同干扰条件下抗干扰性能的量化结果与结论,为基于LDPC码的跳频抗干扰系统设计和自适应抗干扰措施制定提供了理论基础。

Modeling and simulation of LDPC coded FH anti-jamming communication system

To further enhance the anti-jamming capability of the FH(frequency hopping) satellite communication system, combining FH system with channel coding, a low-density parity-check(LDPC) coded FH anti-jamming communication system was established in this paper, and the simulation of the anti-jamming performance was carried out. In the first place, an LDPC coded SFH/BPSK(slow frequency hopping/binary phase shift-keying) anti-jamming communication system was built, whose code lengths and code rates were different. Then, the anti-jamming capability against partial-band jamming (PBJ) with different partial-band jamming factors of the system was simulated and compared. All these prove that the performance of the LDPC coded SFH/BPSK anti-jamming system simulation model is available, which is in conformity with the theoretical analysis. Through simulation and analysis, the quantitative results of the anti-jamming performance were obtained based on different coding parameter under different jamming conditions. As a consequence, the results will provide technical basis for the design of LDPC coded FH anti-jamming system and the adaptive anti-jamming measures.