A Power efficient DST-based multicarrier and multiple access systems for VLC

Suseela Vappangi, V. V. Mani
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Abstract

Visible Light Communication (VLC) exploits cost-effective light emitting diodes (LEDs) to render ‘illumination’ and ‘communication’ contemporaneously and is envisioned to meet the unprecedented growth in mobile data traffic. However, the slow transient response of white phosphorescent LEDs limits the modulation bandwidth. Consequently, orthogonal frequency division multiplexing (OFDM) is utilized to impart high data rate communication at the expense of emergence of high peak to average power ratio (PAPR). Furthermore, the limited dynamic range of LEDs makes this issue more pronounced as it leads to the emergence of detrimental non-linear distortions. This paper proposes discrete sine transform (DST)-based spreading for DC biased optical OFDM (DST-S-DCO-OFDM) to reduce PAPR. Unlike discrete Fourier transform (DFT)-based DCO-OFDM, DST-based DCO-OFDM doesn’t require Hermitian symmetry criteria to attain a real signal transmission. Accordingly, there is a reduction in computational complexity as well as increase in spectral efficiency. In addition, single carrier frequency division multiple access (SC-FDMA) is expedited for reducing PAPR. Therefore, this work derives the analytical expressions for DST-based optical interleaved multiple access (DST-OFDMA) and optical localized frequency division multiple access (DST-OLFDMA). The simulation results evidences that PAPR is decreased drastically by enforcing spreading technique when compared with conventional DST-based DCO-OFDM system. Furthermore, as depicted by the simulation results, the reduction in PAPR is more significant in DST-OFDMA than DST-OLFDMA. However, DST-OFDMA and DST-OLFDMA outperforms DST-based optical orthogonal frequency division multiple access (DST-OOFDMA).
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一种高效的基于dst的多载波多址VLC系统
可见光通信(VLC)利用具有成本效益的发光二极管(led)同时提供“照明”和“通信”,并被设想为满足前所未有的移动数据流量增长。然而,白光磷光led缓慢的瞬态响应限制了调制带宽。因此,利用正交频分复用(OFDM)来实现高数据速率通信,但代价是出现高峰值平均功率比(PAPR)。此外,led有限的动态范围使得这个问题更加明显,因为它会导致有害的非线性失真的出现。针对直流偏置OFDM (DST- s - dco -OFDM),提出了一种基于离散正弦变换(DST)的扩频算法来降低PAPR。与基于离散傅里叶变换(DFT)的DCO-OFDM不同,基于dst的DCO-OFDM不需要厄米对称准则来实现真实的信号传输。因此,计算复杂度降低,频谱效率提高。此外,还加快了单载波频分多址(SC-FDMA)的速度以降低PAPR。因此,本文推导了基于dst的光交错多址(DST-OFDMA)和光局部频分多址(DST-OLFDMA)的解析表达式。仿真结果表明,与传统的基于dst的DCO-OFDM系统相比,采用扩频技术可以显著降低PAPR。此外,仿真结果表明,与DST-OLFDMA相比,DST-OFDMA对PAPR的降低更为显著。然而,DST-OFDMA和DST-OLFDMA优于基于dst的光正交频分多址(DST-OOFDMA)。
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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