Capacity-achieving and Flicker-free FEC coding scheme for Dimmable Visible Light Communication Based on Polar Codes

TL;DR

This paper introduces a polar codes-based FEC scheme for dimmable VLC that enhances efficiency, reduces flicker, and supports lighting dimming without complex auxiliary coding.

Contribution

The proposed scheme is the first to combine capacity-achieving polar codes with flicker mitigation and dimming support in VLC, simplifying coding structure and improving performance.

Findings

Achieves about twofold higher coding efficiency than existing schemes.

Supports flicker-free operation with short run-length properties.

Provides about 3 dB higher coding gain than IEEE standard RS(64,32).

Abstract

Visible light communication (VLC) could provide short-range optical wireless communication together with illumination using LED lighting. However, conventional forward error correction (FEC) codes for reliable communication do not have the features for dimming support and flicker mitigation which are required in VLC for the main functionality of lighting. Therefore, auxiliary coding techniques are usually needed, which eventually reduce the coding efficiency and increase the complexity. In this paper, a polar codes-based FEC coding scheme for dimmable VLC is proposed to increase the coding efficiency and simplify the coding structure. Experimental results show that the proposed scheme has the following advantages: 1) equal probability of 1's and 0's in codewords, which is inherently supporting 50% dimming balance; 2) short run length property (about 90% bits have runs shorter than 5) which can avoid flickers and additional run-length limited line coding; 3) higher coding efficiency about twofold than that of other coding schemes; 4) capacity achieving error correction performance with low-complexity encoding and decoding, which is about 3 dB higher coding gain than that of RS(64,32) in IEEE standard for dimming ratio 50% and about 1 dB higher coding gain than that of LDPC codes for dimming ratio 25% (or 75%).