Abstract
This 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.
© 2016 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription