Expanded Capacity Orthogonal Noise Suppression Multi-level Differential Chaotic Shift Keying Communication System
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摘要: 针对多进制差分混沌移位键控系统传输速率较小且误码率(BER)较差的缺点，该文提出一种扩容型正交抑噪多进差分混沌移位键控(DCSK)通信系统。在该系统的发送端设计了一种改进型混沌基信号发生器，可产生4组正交的混沌基信号，使得通信容量极大提升。定义综合效用函数，并引入粒子群算法对系统各参数优化。对该系统在加性高斯白噪声(AWGN)和Rayleigh衰落信道下理论误码率公式进行推导及系统仿真同时对比不同系统的综合效用函数。结果表明，该系统具有更低的误码率和更优综合效用，具有较好的实际应用价值。Abstract: To address the disadvantages of small transmission rate and poor Bit Error Rate (BER) of M-ary differential chaos shift keying. An expanded capacity orthogonal noise suppression multi-level Differential Chaotic Shift Keying (DCSK) communication system is proposed. An improved orthogonal chaotic signal generator is designed at the transmitter of the system. It can generate four sets of orthogonal chaos-based signals, which can greatly increase the communication capacity. An integrated utility function is defined and a particle swarm algorithm is introduced to optimize each parameter of the system. The theoretical BER equation is derived and the system simulation is analyzed under the Additive White Gaussian Noise (AWGN) channel and Rayleigh fading channel. The integrated utility functions of different systems are also compared. The results show that the system has a lower BER and better integrated utility compared, and has a better practical application.
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表 1 ECO-NS-MDCSK系统的映射规则(M=4)
二进制比特(${b_1},{b_2}$) 传输系数(${a_{1,1}},{a_{2,1}},{a_{3,1}},{a_{4,1}}$) 0 0 1 0 0 0 0 1 0 1 0 0 1 0 0 0 1 0 1 1 0 0 0 1 
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表 2 信道增益取值表
$L$ 情况1下的$E[\lambda _l^2]$ 情况2下的$E[\lambda _l^2]$ $L = 2$ 1/2,1/2 1/11,10/11 $L = 3$ 1/3,1/3,1/3 1/111,10/111,100/111
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