A Novel Non-DC Biased Intensity Modulated Indoor MIMO-VLC System Using Walsh Precoder

P Muneer,Ali Algahtani,Amir Kessentini,Mohamed Abbas,Abdul Wase Mohammed,V P Thafasal Ijyas,Hassen Loukil

doi:10.1155/2020/1437049

Abstract

In this paper, we propose an indoor visible light communication (VLC) system which makes use of Walsh precoding and multiple light-emitting diodes (LEDs) at the transmitter for multiplexing the data. The proposed VLC system is based on intensity modulation and uses the notion of spatial modulation for communicating the positive and negative values of the synthesized transmit signal using signal processing technique at the transmitter. We also illustrate the flexibility, ability, and easiness of the system to configure well in a multiuser environment. We have also developed a near-maximum likelihood (ML) detection technique for efficiently decoding the data bits at the receiver. The proposed near-ML reduces the search space involved in ML technique by using the initial ZF solution. The results of the simulation studies illustrate that the proposed technique offers a higher data rate and good bit error rate (BER) performance in indoor VLC environments.

Highlights

Visible light communication (VLC) has recently emerged as a promising paradigm in wireless communication with multiple applications in various scenarios
The highlights of the contribution are summarized as follows: (i) We propose a visible light communication (VLC) system that makes use of intensity modulation and use the notion of spatial modulation for communicating the positive and negative values of the synthesized transmit signal using signal processing techniques at the transmitter (ii) The proposed system is highly flexible and easy to configure in both single and multiuser and environments (iii) We have shown the performance of the proposed modulation and demodulation technique by using zero forcing (ZF) and maximum likelihood (ML) detection scheme at the receiver
We developed a near-ML detection technique by reducing the search space involved in ML via initial ZF solution (iv) The results of the simulation studies illustrate that the proposed technique offers a higher data rate and good bit error rate (BER) performance under indoor VLC environments

Summary

Introduction

Visible light communication (VLC) has recently emerged as a promising paradigm in wireless communication with multiple applications in various scenarios. A spectrally efficient precoding/decoding scheme for optical-OFDM (OOFDM) is detailed in [18] It can be used for both single-input, single-output (SISO) and MIMO VLC systems. We propose an indoor visible light communication (VLC) system which makes use of the Walsh precoding and multiple light-emitting diodes (LEDs) at the transmitter for multiplexing the data. (i) We propose a VLC system that makes use of intensity modulation and use the notion of spatial modulation for communicating the positive and negative values of the synthesized transmit signal using signal processing techniques at the transmitter (ii) The proposed system is highly flexible and easy to configure in both single and multiuser and environments (iii) We have shown the performance of the proposed modulation and demodulation technique by using zero forcing (ZF) and maximum likelihood (ML) detection scheme at the receiver.

Proposed Intensity Modulation Technique

Equalization and Data Detection

Near ML-Based Detection Scheme for the Proposed Communication System

Computational Complexity

Simulation and Results

Conclusion