Total least‐square‐based receiver for asymmetrically clipped optical‐orthogonal frequency divisional multiplexing visible light communication system

Abstract

This study proposes a receiver for an asymmetrically clipped optical orthogonal frequency‐division multiplexing system that utilises the total least‐squares (TLS) technique. Commonly used estimation techniques such as least squares, diversity combining, minimum‐mean‐square‐error, and pairwise maximum likelihood ignore the perturbation present while estimating the received signal, which causes the estimated signal to be inaccurate. In this study, a TLS‐based receiver is proposed, which takes into consideration the errors present in both the data matrix (channel) and the observation matrix (received signal). While this technique is suboptimal, it is shown that with reasonable computational complexity it has an acceptable performance in a scenario with low processing capability and low battery power. Simulations are carried out for both line‐of‐sight and non‐line‐of‐sight optical channels and the performance is analysed on the basis of bit error rate versus E b / N 0 where E b is the energy received per information bit and N 0 is the noise power spectral density.