Indoor Wavelet OFDM VLC-MIMO System: Performance Evaluation

• Published in: Symmetry (Basel) Vol. 13; no. 2; p. 270
• Main Authors: Badawi, Waleed K., El-Hossary, Marwa G., Aly, Moustafa H.
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.02.2021
• Subjects: Antennas; Bandwidths; Bit error rate; Contours; Data transmission; Efficiency; Equalization; Fast Fourier transformations; Fourier transforms; Frequency domain analysis; imaging angle diversity receiver (ImADR); imaging receiver (ImR); Light; Light emitting diodes; MIMO communication; Optical communication; Orthogonal Frequency Division Multiplexing; orthogonal frequency division multiplexing (OFDM); Performance enhancement; Performance evaluation; pre-equalization; Radio frequency; Signal to noise ratio; Spectrum allocation; Transmitters; visible light communication (VLC); Wavelet transforms; wavelet-OFDM; Wireless communications
• ISSN: 2073-8994; 2073-8994
• DOI: 10.3390/sym13020270

Both light emitting diode (LED) characteristics for illumination and communication simultaneously have made visible light communication-orthogonal frequency division multiplexing (VLC-OFDM) a strong competitive to radio frequency (RF). In this juncture, to improve signal to noise ratio (SNR) and coverage contour, the wavelet-OFDM is suggested for indoor VLC systems. In this paper, a wavelet VLC-OFDM is proposed for imaging multiple-input multiple-output (MIMO) systems. The proposed wavelet-OFDM is exploited for a hybrid space-frequency domain pre-equalization technique instead of the traditional fast Fourier transform (FFT)-OFDM technique. The Meyer filter is selected and employed in the proposed technique. A comparable achievement is elaborated for several numbers of channels to achieve the enhanced performance in terms of bit rate and coverage contour. In addition, a useful comparison is executed between our wavelet VLC-OFDM and the traditional FFT-OFDM for a hybrid space-frequency domain pre-equalization technique. The simulation results emphasize the superiority point of wavelet VLC-OFDM MIMO system by improving the coverage contour by ~20% over the traditional OFDM at a 10−3 bit error rate (BER) target. Hence, the proposed technique can be potentially executed in indoor VLC-MIMO systems.