一种新型MIMO-DCSK保密通信系统

摘要

Multi-input and multi-output (MIMO) technology can decrease channel noise and multipath fading without any increase of system bandwidth and transmitting power. The modified differential chaos shift keying (DCSK) has better performances of security and channel utilization. Combined with the advantages of both technologies, a novel MIMO-DCSK secure communication system is designed. The proposed new system is analyzed in detail, and the emphasis is focused on the bit error rate (BER) performance under white Gaussian noise channel. The theoretical analysis and simulation results are well consistent and show that the overall performance of the novel MIMO-DCSK secure communication system is greatly superior to that of conventional DCSK communication system. The prospects of the new system in real application are studied also.%MIMO技术能够抑制信道噪声和多径衰落，无需增加系统带宽和发送功率，而改进型差分混沌键控(DCSK)拥有更好的保密性和信道利用率，结合两者的优势设计出一种新的MIMO-DCSK混沌保密通信系统。对新系统着重在高斯白噪声信道下的误码性能进行了深入研究。仿真结果表明：新型MIMO-DCSK保密通信系统的综合性能比传统DCSK通信系统更为优越，与理论分析的结果一致。