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室内可见光通信OFDM自适应比特功率加载算法性能分析

Performance Analysis of Optical OFDM Adaptive Bit-Power Loading in Indoor Visible Light Communications

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摘要

室内光无线信道可以看作准静态、具有低通特性的多径信道, 并且可见光通信通常是功率受限系统。为了充分利用信道频谱资源及节约能量, 提出将Chow、Hughes-Hartogs、Fischer自适应比特-功率加载算法应用于非对称限幅光正交频分复用(ACO-OFDM)系统, 介绍了自适应比特功率加载过程, 并比较了自适应ACO-OFDM和自适应直流偏置光OFDM(DCO-OFDM)的性能。结果表明, 在保证误码率性能时, 相比等比特加载方法, 自适应算法能节约15%的光功率和30%的电功率, 其中Fischer算法最节约功率, 而Hughes-Hartogs算法需要的功率最多。在信息速率相同时, 自适应ACO-OFDM比DCD-OFDM更节约功率。

Abstract

The indoor optical wireless channel can be considered as quasi-static multipath channel with inherently low-pass characteristic. Moreover, the visible light communication is usually a power limited system. In order to make full use of the channel spectrum resources and save the energy, the adaptive bit-power loading algorithms of Chow, Hughes-Hartogs and Fischer are applied to the asymmetrically-clipped optical orthogonal frequency division multiplexing (ACO-OFDM) system is proposed. The process of adaptive bit-power loading is introduced, and the performance of the adaptive ACO-OFDM is compared with that of the adaptive direct current optical OFDM (DCO-OFDM). The results show that, compared with the equal bit loading method, the adaptive load algorithm can save about 15% for the optical power and about 30% for the electric power when the performance of bit error rate is guaranteed. Fischer algorithm can save the most optical and electrical power, while Hughes-Hartogs algorithm needs more power. At the same transmit rate, the adaptive ACO-OFDM is more economical than the adaptive DCO-OFDM.

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中图分类号:TN929.12

DOI:10.3788/lop56.030603

所属栏目:光纤光学与光通信

基金项目:国家自然科学基金(61461026)

收稿日期:2018-07-05

修改稿日期:2018-08-11

网络出版日期:2018-08-24

作者单位    点击查看

贾科军:兰州理工大学计算机与通信学院, 甘肃 兰州 730050
靳斌:兰州理工大学计算机与通信学院, 甘肃 兰州 730050
郝莉:西南交通大学信息编码与传输省重点实验室, 四川 成都 610031

联系人作者:贾科军(kjjia@lut.cn)

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引用该论文

Jia Kejun,Jin Bin,Hao Li. Performance Analysis of Optical OFDM Adaptive Bit-Power Loading in Indoor Visible Light Communications[J]. Laser & Optoelectronics Progress, 2019, 56(3): 030603

贾科军,靳斌,郝莉. 室内可见光通信OFDM自适应比特功率加载算法性能分析[J]. 激光与光电子学进展, 2019, 56(3): 030603

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