基于正交混沌载波的多用户 DCSK 系统性能分析

摘要

现有的多用户差分混沌移位键控（multiple-user differential chaos shift keying，MU-DCSK）算法存在用户间干扰、误码性能不理想等问题。为了提高误码性能，提出一种基于正交混沌载波的多用户差分混沌移位键控（MU-DCSK based on orthogonal chaotic carrier，OMU-DCSK）通信系统。该系统通过设计一种正交混沌信号发生器，利用其转换特性和正交特性，有效降低平均比特能量和彻底消除多址干扰。推导出在瑞利信道中的比特误码率公式并进行仿真。理论分析和仿真结果表明，OMU-DCSK 在较小牺牲系统复杂性的条件下，有效提高了系统的误码性能。%There are many defects in existing multi-user differential chaos shift keying (MU-DCSK)sys-tems,such as multi-user interference and undistinguished bit error rate (BER)performance.To improve BER performance,the MU-DCSK based on the orthogonal chaotic carrier (OMU-DCSK)system is proposed.By in-troducing an orthogonal chaotic signals generator,the average bit energy is reduced and multi-user interference components are eliminated.The BER over Rayleigh fading channels is derived and numerous simulations are worked.Theoretical analysis and simulation results show that the proposed system has superior BER perform-ance with a little cost in complexity.