Tan Jiandong, Wang Zhaocheng, Wang Qi, Dai Linglong
Opt Express. 2016 Mar 7;24(5):4573-4581. doi: 10.1364/OE.24.004573.
Visible light communication (VLC) is recommended for indoor transmissions in 5G network, whereby DC-biased optical orthogonal frequency division multiplexing (DCO-OFDM) is adopted to eliminate the inter-symbol interference (ISI) but suffers from considerable performance loss induced by clipping distortion. In this paper, bit-interleaved coded modulation with iterative demapping and decoding (BICM-ID) scheme for clipped DCO-OFDM is investigated to enhance the performance of VLC systems. In order to further mitigate the clipping distortions, a novel soft demapping criterion is proposed, and a simplified demapping algorithm is developed to reduce the complexity of the proposed criterion. Simulation results illustrate that the enhanced demapping algorithm achieves a significant performance gain.
可见光通信（VLC）被推荐用于5G网络中的室内传输，其中采用直流偏置光正交频分复用（DCO-OFDM）来消除符号间干扰（ISI），但会因削波失真而遭受相当大的性能损失。本文研究了用于削波DCO-OFDM的具有迭代解映射和解码的比特交织编码调制（BICM-ID）方案，以提高VLC系统的性能。为了进一步减轻削波失真，提出了一种新颖的软解映射准则，并开发了一种简化的解映射算法以降低所提准则的复杂度。仿真结果表明，增强型解映射算法实现了显著的性能提升。
