DPI DCSK调制与BCJR解码

Ziqiang Zhu, Pingping Chen, Zhijian Lin, Haoyu Chen, Yi Fang, Yong Li
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引用次数: 0

摘要

本文提出了一种新颖的[公式:见文本]——基于bhl - cocke - jelin - raviv (BCJR)解码(DPI-DCSK-BCJR)的任意差分排列索引(DPI)差分混沌移位键控(DCSK)。利用混沌信号的差分调制和准正交特性,DPI-DCSK-BCJR可以提供两个以上的计算能量来确定传输位。对多径瑞利衰落信道的误码率进行了理论分析,并进行了仿真验证。结果表明,该方案比传统的DPI-DCSK方案的性能高出2[公式:见文]dB。这种性能增益在高延迟信道上尤其明显。此外,在实际的超宽带(UWB)无线信道上验证了所提出的调频DPI-DCSK-BCJR的优势。此外,我们还研究了DPI-DCSK-BCJR在更广泛的多用户通信中的应用。仿真结果表明,与传统的PI-DCSK和DPI-DCSK相比,DPI-DCSK- bcjr在两用户和三用户系统中都可以获得高达5 dB的性能增益[公式:见文本]。因此,所提出的DPI-DCSK-BCJR可以被认为是低复杂性和高速率基于混沌的无线通信的低成本替代方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
DPI DCSK Modulation with BCJR Decoding
This paper proposes a novel [Formula: see text]-ary differential permutation index (DPI) differential chaos shift keying (DCSK) by using the Bahl–Cocke–Jeline–Raviv (BCJR) decoding (DPI-DCSK-BCJR) for chaos-based communications. By exploiting the characteristics of differential modulation and quasi-orthogonality of chaotic signals, the proposed DPI-DCSK-BCJR can provide two more calculated energies to decide the transmitted bits. Theoretical analysis of bit-error-rate (BER) is carried out over multipath Rayleigh fading channel and then validated via simulations. The proposed scheme is demonstrated to outperform the conventional DPI-DCSK by 2[Formula: see text]dB for different [Formula: see text]. This performance gain is especially increased over high-delay channels. Furthermore, the advantage of the proposed frequency-modulated DPI-DCSK-BCJR is verified over practical ultra-wideband (UWB) wireless channels. In addition, we investigate the proposed DPI-DCSK-BCJR for more generalized multiuser communications. The simulation result shows that DPI-DCSK-BCJR can achieve performance gains up to 5[Formula: see text]dB as compared to the conventional PI-DCSK and DPI-DCSK for both two and three user systems. Consequently, the proposed DPI-DCSK-BCJR can be considered as a low-cost alternative for low-complexity and high-rate chaotic-based wireless communication.
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