LDPC-Coded CAP with Spatial Diversity for UVLC Systems over Generalized-Gamma Fading Channel

In this paper, low-density parity-check (LDPC)-coded carrierless amplitude and phase (CAP) modulation with spatial diversity is proposed to mitigate turbulence-induced fading in an underwater visible-light communication (UVLC) channel. Generalized-gamma (GG) distribution was used to model the fading, as this model is valid for weak- and strong-turbulence regimes. On the basis of the characteristic function (CHF) of GG random variables, we derived an approximated bit-error rate (BER) for the CAP modulation scheme with spatial diversity and equal-gain combining (EGC). Furthermore, we simulated the performance of the CAP system with diversity and LDPC for various turbulence conditions and validated the analysis. Obtained results showed that the combination of LDPC and spatial diversity is effective in mitigating turbulence-induced fading, especially when turbulence strength is strong

Editorial to the Special Issue on “Visible Light Communications, Networking, and Sensing”

The next generation wireless technology networks and beyond (i.e., fifth and sixth generation) are changing the global landscape for the interconnectivity of everything-toeverything. To this end, different communication technologies, including millimeter wave, terahertz, and optical wireless, are to be utilized. The latter includes the three spectral bands of ultraviolet, visible, and infrared. Recently, we have seen a growing interest in the potential use of the visible band in the front end of the access networks, mostly in indoor environments