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首页> 外文期刊>Wireless Communications Letters, IEEE >Enhanced Optical OFDM/OQAM for Visible Light Communication Systems
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Enhanced Optical OFDM/OQAM for Visible Light Communication Systems

机译：增强光学OFDM / OQAM用于可见光通信系统

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摘要

Orthogonal frequency division multiplexing/offset quadrature amplitude modulation (OFDM/OQAM) has the advantage of high spectral efficiency due to non-requirement of cyclic prefix (CP) and guard band. However, the high direct current (DC) used in OFDM/OQAM is power inefficient for visible light communication (VLC). In this letter, an enhanced OFDM/OQAM (EO-OFDM/OQAM) scheme is proposed for VLC, which is inspired by the idea of the pulse-amplitude-modulation based hybrid optical OFDM (PHO-OFDM) scheme. In this system, the half of subcarriers of the normal branch carry useful data while the remaining subcarriers are selected to carry negative clipping noise instead of useful data for improving the power efficiency, and a flexible power allocation method is introduced. The simulation results show that compared with the PHO-OFDM, the proposed scheme has a better bit error rate (BER) performance under the same average bit rate without additional operations of interference regeneration and cancellation.
机译：正交频分复用/偏移正交调制（OFDM / OQAM）具有由于循环前缀（CP）和保护频带的不要求而具有高光谱效率的优点。然而，OFDM / OQAM中使用的高直流电流（DC）是可见光通信（VLC）的功率低效。在这封信中，提出了一种增强的OFDM / OQAM（EO-OFDM / OQAM）方案，该方案是由脉冲幅度调制的混合光学OFDM（PHO-OFDM）方案的思想的启发。在该系统中，正常分支的子载波的一半携带有用的数据，同时选择剩余的子载波以携带负剪切噪声而不是用于提高功率效率的有用数据，并且引入了灵活的功率分配方法。仿真结果表明，与PHO-OFDM相比，所提出的方案在相同的平均比特率下具有更好的误码率（BER）性能，而无需额外的干扰再生和取消操作。

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