可见光通信
正交频分复用
算法
计算机科学
误码率
发射机
频道(广播)
电子工程
物理
发光二极管
解码方法
电信
光学
工程类
作者
Ying-Dong Zang,Jian Zhang,Ling-Han Si-Ma
出处
期刊:IEEE Photonics Journal
日期:2018-04-01
卷期号:10 (2): 1-9
被引量:14
标识
DOI:10.1109/jphot.2017.2785798
摘要
For high-speed visible light communication (VLC) with weak signals such as in underwater environment, dc-biased optical orthogonal frequency-division multiplexing (DCO-OFDM) based on single-photon avalanche diodes (SPADs) is viewed as a promising scheme. Since the channel noise is Poisson distributed, the maximum likelihood (ML) detection is mathematically intractable for DCO-OFDM, and the ML-detection-based minimum distance criterion originally for Gaussian channels is applied to SPAD-based DCO-OFDM. However, the error performance is degraded. For this reason, we propose an Anscombe root (AR) DCO-OFDM by using the existing AR transformation before fast Fourier transformation at the receiver side and a square operation at the transmitter. For the proposed AR-DCO-OFDM, the channel noise is well approximated to be Gaussian distributed, and thus, the asymptotically optimal detection is based on the low-complexity minimum-distance criterion. Extensive simulations indicate that our proposed AR-DCO-OFDM can substantially improve the conventional DCO-OFDM with minimum-distance detection for SPAD-based VLC systems, and the attained gain is above 5 dB at the bit error rate of 10 -4 for numerous scenarios.
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