Efficient demodulation scheme for multilevel modulation based optical camera communication

TL;DR

This paper introduces a hybrid coding scheme and novel algorithms to improve multilevel optical camera communication, achieving higher data rates and robustness against signal issues.

Contribution

It presents a new hybrid code structure, an RRT algorithm, and an adaptive sampling method to enhance multilevel OCC performance.

Findings

Achieved data rate of 8.4 Kbit/s with the proposed methods.

Demonstrated effectiveness of the algorithms in experimental setups.

Improved robustness against SPO in OCC systems.

Abstract

We proposed and experimentally demonstrated a new hybrid code structure based on the overlapping of two light sources to produce the effect of multi-voltage amplitudes. And we also proposed an efficient polarity reversal threshold (RRT) algorithm for multilevel based OCC system. Then taking the issue of SPO into account, a novel adaptive sampling method (ASM) is proposed, which can effectively alleviate the problem of SPO and further enhance the performance of multilevel OCC. It is demonstrated that a data rate of 8.4 Kbit/s can be achieved by applying the proposed two algorithms.