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LDPC-Coded CAP with Spatial Diversity for UVLC Systems over Generalized-Gamma Fading Channel

机译:通用伽玛衰落信道上用于UVLC系统的具有空间分集的LDPC编码CAP

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摘要

In this paper, low-density parity-check (LDPC)-coded carrierless amplitude and phase (CAP) modulation with spatial diversity is proposed to mitigate turbulence-induced fading in an underwater visible-light communication (UVLC) channel. Generalized-gamma (GG) distribution was used to model the fading, as this model is valid for weak- and strong-turbulence regimes. On the basis of the characteristic function (CHF) of GG random variables, we derived an approximated bit-error rate (BER) for the CAP modulation scheme with spatial diversity and equal-gain combining (EGC). Furthermore, we simulated the performance of the CAP system with diversity and LDPC for various turbulence conditions and validated the analysis. Obtained results showed that the combination of LDPC and spatial diversity is effective in mitigating turbulence-induced fading, especially when turbulence strength is strong.
机译:在本文中,提出了一种具有空间分集的低密度奇偶校验(LDPC)编码的无载波幅度和相位(CAP)调制,以减轻湍流引起的水下可见光通信(UVLC)信道中的衰落。广义伽玛(GG)分布用于对衰落进行建模,因为该模型适用于弱湍流和强湍流状态。基于GG随机变量的特征函数(CHF),我们导出了具有空间分集和等增益合并(EGC)的CAP调制方案的近似误码率(BER)。此外,我们模拟了具有多样性和LDPC的CAP系统在各种湍流条件下的性能,并验证了分析结果。所得结果表明,LDPC和空间分集的组合可有效减轻湍流引起的衰落,特别是在湍流强度较强的情况下。

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