R-OFDM for RGBA-LED-Based Visible Light Communication With Illumination Constraints
2016; Institute of Electrical and Electronics Engineers; Volume: 34; Issue: 23 Linguagem: Inglês
10.1109/jlt.2016.2613891
ISSN1558-2213
AutoresLei Kong, Wei Xu, Hua Zhang, Chunming Zhao, Xiaohu You,
Tópico(s)Semiconductor Lasers and Optical Devices
ResumoThis paper proposes a reshaped orthogonal frequency division multiplexing (R-OFDM) scheme for intensity modulation/direct detection visible light communication (VLC) systems, where an LED consisting of red, green, blue, and amber chips (RGBA-LED) is adopted as the transmitter. In R-OFDM, the signal is adjusted by signal separation and biasing after clipping (BAC)/scaling before clipping (SBC) operations for transmitting in the RGBA-LED. We optimize both biasing and scaling factors for the BAC and SBC operations, respectively. Correspondingly, a direct detection algorithm is developed for data recovery at receiver. Theoretical bit error rate (BER) performance of the proposed R-OFDM scheme is further analyzed. Specifically for the multicolor LED transmission, a low complexity parallel interference cancellation algorithm is also proposed for eliminating the interference caused by cross-talk in multicolor VLC channels. Numerical results over practical optical channels are presented to validate the advantage of the proposed R-OFDM scheme. It is revealed that the R-OFDM achieves noticeable performance gain in term of BER than the conventional Flip-OFDM and ACO-OFDM.
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