Advanced A-law employing nonlinear distortion reduction in DCO-OFDM systems

2015 IEEE/CIC International Conference on Communications in China - Workshops (CIC/ICCC) Pub Date : 2015-11-01 DOI:10.1109/ICCChinaW.2015.7961604

Xiaojing Zhang, Peng Liu, Jiang Liu, Song Liu

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引用次数: 5

Abstract

In this paper, an advanced A-law nonlinear companding algorithm is employed to reduce the nonlinear distortions from the light emitting diode (LED) on visible light communication (VLC) systems. The nonlinear transfer characteristics of LEDs are not identical. But the transfer effect of an LED can be modeled as a linear transfer range with the maximum and minimum forward voltages. Therefore, the signal will be truncated when the signal amplitude is larger than the maximum limit or smaller than the minimum limit. The advanced A-law companding algorithm can concentrate the signal amplitude to the limited linear transfer range and decrease the truncation distortion. We evaluate the performance of the proposed advanced A-law companding algorithm comparing with typical A-law and uncompanded schemes via simulations in the direct current biased optical orthogonal frequency division multiplexing (DCO-OFDM) system. Experimental results demonstrate that the advanced A-law companding algorithm can effectively alleviate the nonlinear distortion of the DCO-OFDM system in terms of system bit error ratio (BER) performances.

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DCO-OFDM系统中采用非线性失真抑制的先进a律

本文采用一种先进的a律非线性压缩算法来减小可见光通信系统中发光二极管(LED)的非线性失真。led的非线性传递特性是不相同的。但是LED的转移效应可以用最大和最小正向电压的线性转移范围来建模。因此，当信号幅度大于最大限制或小于最小限制时，信号将被截断。先进的a律压缩算法可以将信号幅度集中到有限的线性传输范围内，减小截断失真。我们通过在直流偏置光正交频分复用(DCO-OFDM)系统中的仿真，比较了所提出的先进a律压缩算法与典型a律压缩和无压缩方案的性能。实验结果表明，从系统误码率(BER)性能的角度来看，改进的a律扩展算法可以有效地缓解DCO-OFDM系统的非线性失真。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

2015 IEEE/CIC International Conference on Communications in China - Workshops (CIC/ICCC)

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