Performance Improvement of Dimmable OFDM-Visible Light Communication using Subcarrier Index Modulation and Reed Solomon Encoding

TL;DR

This paper introduces a novel RS-OFDM-IM scheme for VLC that enhances spectral efficiency and reduces clipping noise by combining Reed-Solomon encoding with subcarrier index modulation, showing superior performance over traditional methods.

Contribution

The paper proposes a new RS-OFDM-IM scheme that integrates Reed-Solomon encoding with subcarrier index modulation for improved VLC system performance.

Findings

BER performance is improved under practical clipping conditions.

Spectral efficiency is enhanced compared to traditional OFDM schemes.

Simulation results confirm the superiority of the proposed method.

Abstract

In this paper, we propose a new subcarrier index modulation scheme for orthogonal frequency division multiplexing (OFDM), which incorporates the Reed-Solomon (RS) encoding in a visible light communication (VLC) system. In this scheme, the incoming bits are first encoded using the RS encoder, then a set of symbols in the resulting RS codeword are punctured, and the remaining symbols are modulated and mapped onto the OFDM subcarriers. This system is referred to as RS-OFDM-IM. Unlike the traditional subcarrier index modulation (SIM) schemes, the proposed scheme operates based on conveying extra information by inactivating the selected subcarriers, which facilitates simultaneous clipping noise reduction and spectral efficiency enhancement in OFDM-VLC. The bit error rate (BER) and throughput of the proposed technique is theoretically and numerically analyzed. The simulation results show the superiority of the proposed technique as compared to the coded DCO-OFDM without SIM and the classical SIM in OFDM-VLC in a system with practical clipping conditions.