Enhanced Signal Transmission Performance based on Multitap Equalization in Optical FBMC Burst

Abstract

Due to the impact of predominant inherent imaginary interference (IMI), for the first time in visible light communication (VLC) systems, 3-taps equalizer with flip-filter bank multicarrier (Flip-FBMC) burst is proposed to overcome the degradation performance along with 1-tap equalizer estimation. Over high delays channel profile, the proposed system offers 0.7 dB signal to noise ratio (SNR) gain at $10^{-3}$ of the symbol error rate (SER), while an identical error is obtained at high SNR region corresponding to SER $=10^{-4}$, compared to Flip-OFDM system. Moreover, the possibility to optimize its performance is developed through a tail-shortening mechanism, where $\approx$ 11% increment in its spectral efficiency is obtained when compared to the throughput obtained by Flip-CP-OFDM system. Besides, the theoretical analysis reveals that the induced IMI outside the first order neighbor zone, which cannot be controlled using IAM, has a negligible impact on the estimation accuracy, compared to DCO-FBMC format, where a significant reduction in estimating level is captured.