一种改进的混合DCSK通信方案及性能分析

混沌键控(CSK)按解调方式通常分为相干解调的CSK与非相干解调的CSK。相干解调的CSK一般需要混沌同步,后者被证明在实际噪声信道中没有足够的鲁棒性。非相干解调的CSK由于不需要混沌同步,具有较好的鲁棒性,缺点是误码率较高。现有的CSK中误码率最低的是差分混沌键控(DCSK),但缺点是带宽利用率低于一般CSK且不适用于保密通信。将基于回归映射的CSK与现有的DCSK相结合,提出一种改进的基于回归映射的混合DCSK方案。理论分析和仿真结果表明:混合DCSK比现有DCSK提高一倍带宽利用率,误码率比非相干解调的CSK低很多,且具有在保密通信领域应用的可能。

An Improved Regression Differential Chaos Shift Keying with Performance Analysis

Chaos Shift Keying (CSK) is generally divided into two categories by demodulation method as coherent detection CSK and non-coherent ones. Coherent detection CSK requires chaos synchronization, which is proved to have insufficient robustness in AWGN channel. Non-coherent detection CSK is robust due to the absence of chaos synchronization, while its BER is relatively high. Differential Chaos Shift Keying (DCSK) is proved to obtain the best BER performance. However, it doubles the bandwidth requirement comparing to CSK at the same bit rate and not suitable to security communication. An improved regression based approach of hybrid DCSK is presented, which combines conventional DCSK with regression based non-coherent detection CSK. The new approach doubles the efficiency of bandwidth of DCSK. Comparing to non-coherent detection CSK, the hybrid approach has a much better performance in BER.