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首页> 外文会议>IEEE International Conference on Communications >Low-Complexity and Robust PAPR Reduction and LED Nonlinearity Mitigation for UACO-OFDM LiFi Systems
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Low-Complexity and Robust PAPR Reduction and LED Nonlinearity Mitigation for UACO-OFDM LiFi Systems

机译：UACO-OFDM LiFi系统的低复杂度和鲁棒的PAPR降低以及LED非线性缓解

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摘要

We propose a low-complexity and highperformance joint peak-to-average power ratio (PAPR) reduction and light emitting diode (LED) nonlinearity mitigation approach for unipolar asymmetrically clipped optical-orthogonal frequency division multiplexing (UACO-OFDM) based light fidelity (LiFi) systems. This is the first reported work to apply nonlinear compression based on μ-law companding for UACO-OFDM LiFi systems to reduce PAPR. In order to avoid the effect of the nonlinearity of LED, the transmitted signals are compressed further linearly. The signal distortion caused by nonlinear and linear compression is compensated for using multiple LEDs for simultaneous transmission. The proposed joint PAPR reduction and LED nonlinearity mitigation approach provides low complexity, searching is not required. Also, it is spectrum- and energy-efficient, requiring no pilot and consuming no extra transmission power. Simulation results show that the proposed approach significantly outperforms the state-of-the-art methods in terms of complementary cumulative distribution function (CCDF) and bit error rate (BER), and that it is more robust against the LED nonlinearity than conventional UACO-OFDM LiFi systems and other methods in the literature.
机译：我们针对基于单极非对称削波的光正交频分复用（UACO-OFDM）的光保真度（LiFi）提出了一种低复杂度和高性能的联合峰均功率比（PAPR）降低和发光二极管（LED）非线性缓解方法）系统。这是第一个报告的工作，该工作将基于μ律压缩的非线性压缩应用于UACO-OFDM LiFi系统以降低PAPR。为了避免LED非线性的影响，传输的信号被进一步线性压缩。非线性和线性压缩引起的信号失真可以通过使用多个LED同时传输来补偿。提出的联合PAPR降低和LED非线性缓解方法提供了低复杂度，不需要搜索。而且，它具有频谱和能量效率，不需要导频，也不需要消耗额外的传输功率。仿真结果表明，在互补累积分布函数（CCDF）和误码率（BER）方面，该方法明显优于最新方法，并且与传统的UACO-相比，该方法对LED非线性的鲁棒性更高OFDM LiFi系统和文献中的其他方法。

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