Performance Analyze for Multiuser-DCSK Communication System Based on Hilbert Transform
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摘要: 针对差分混沌移位键控(DCSK)传输速率低的问题，该文提出一种基于希尔伯特变换的多用户DCSK(HMU-DCSK)通信系统。在固定阶数的Walsh码条件下，通过希尔伯特变换将正交基信号集合提高1倍，并确保分配给每个用户的载波信号正交。推导了在Rayleigh衰落信道下的误码率公式并进行仿真。结果表明，相同N值下HMU-DCSK系统的传输速率是传统多用户DCSK系统的2倍；相同传输速率下HMU-DCSK系统的误码性能明显优于传统多用户DCSK系统。Abstract: A multiuser Differential Chaos Shift Keying (DCSK) communication system based on Hilbert transform is proposed (HMU-DCSK), to solve the problem of low transmission rate of DCSK. Under the condition of fixed-order Walsh codes, the set of orthogonally-based signals is doubled by the Hilbert transform and the carrier signals assigned to each user are guaranteed to be orthogonal. The Bit-Error-Rate (BER) formula in Rayleigh fading channel is derived and numerous simulations are conducted. The simulation results show that the transmission rate of HMU-DCSK system is twice that of traditional multiuser DCSK system under the same N value, meanwhile, the BER performance of HMU-DCSK system is obviously better than the traditional multi-user DCSK system under the same transmission rate.
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Key words:
- Chaotic communication /
- Multiuser /
- Walsh codes /
- Hilbert transform /
- Transmission rate
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