LED Selection and MAP Detection for Generalized LED Index Modulation

TL;DR

This paper introduces LED selection and a simplified MAP detection method for generalized LED index modulation in visible light communication, improving performance for larger MIMO configurations.

Contribution

It extends LED selection and MAP detection techniques to generalized MIMO systems with OFDM in VLC, including a simplified MAP implementation for even numbers of LEDs.

Findings

MAP and LED selection outperform other algorithms for large LED arrays.

Performance gains are demonstrated in simulations for 4x4 and larger MIMO configurations.

Simplified MAP detection is effective for even numbers of LEDs greater than four.

Abstract

In this paper, we propose light-emitting diode (LED) selection that can be applied not only to the conventional Multiple-Input Multiple-Output (MIMO) case, but also to a larger MIMO configuration of generalized LED index modulation (GLIM) system with optical orthogonal frequency division multiplexing (OFDM) in visible light communication (VLC). Moreover, we derive a simplified implementation of the maximum a posteriori (MAP) detector when the number of LEDs is an even number larger than four. Simulation results show that the performance of MAP and LED selection is better than other detection algorithms for larger even numbers of LEDs and conventional GLIM for $4\times4$ transmission, respectively.