Performance Analysis of Orthogonal Multiuser Short Reference Differential Chaos Shift Keying Communication System
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摘要: 针对差分混沌移位键控系统传输速率和能量效率低的缺点，该文提出一种正交多用户短参考差分混沌移位键控(OMU-SR-DCSK)通信系统。系统将参考信号长度缩短为每个信息承载信号长度的1/P，并在参考时隙后增加了两路连续的信息时隙，每个信息时隙内，N个用户信息在Walsh码正交特性作用下同时传输，利用Walsh码的正交特性可完全消除用户间干扰，从而改善系统误码性能。推导了OMU-SR-DCSK在加性高斯白噪声(AWGN)信道和Rayleigh衰落信道下的理论比特误码率(BER)公式并进行了仿真。仿真结果和理论推导的吻合证明了理论推导的正确性，从而为OMU-SR-DCSK应用于多用户串行传输系统提供了理论依据。Abstract: An Orthogonal MultiUser Short Reference Differential Chaos Shift Keying (OMU-SR-DCSK) communication system is proposed to overcome the dominant drawbacks of DCSK system relating to low transmission rate and energy efficiency. The proposed system shortens the reference signal to 1/P of information bearing signal. Two consecutive information time slots are added after the reference time slot. Due to the excellent features of Walsh codes, the system sends information from N users in one information time slot. Meanwhile, the use of orthogonality of the Walsh code eliminates completely intra-signal interference and enhances the performance of Bit Error Rate (BER) better. The theoretical BER formula of OMU-SR-DCSK over Additive White Gaussian Noise (AWGN) channel and Rayleigh fading channel are derived and simulations are carried out respectively. The coincidence between the simulation results and the theoretical derivations proves the correctness of the theoretical derivation, providing a theoretical basis for the application of OMU-SR-DCSK to multiuser serial transmission system.
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表 1 OMU-SR-DCSK, SRMR-DCSK, VHE-DCSK和MC-DCSK系统的能量效率及传输速率
系统名称 传输速率(${R_B}$) 能量效率(${E_\eta }$) OMU-SR-DCSK ${{2N} / {(R + 2\beta )}}$ ${{2N\beta } / {(R + 2N\beta )}}$ SRMR-DCSK ${N / {(R + \beta )}}$ ${{N\beta } / {(R + N\beta )}}$ VHE-DCSK ${N / {(2\beta }})$ ${N / {(1 + N)}}$ MC-DCSK ${N / \beta }$ ${N / {(1 + N)}}$ 
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