Pre-Distorted Enhanced ADO-OFDM for Hybrid VLC Networks: A Mutual-Interference-Free Approach

Xuan Huang,Jian Song,Fang Yang,Changyong Pan

doi:10.1109/jphot.2020.2979776

Xuan Huang, Jian Song + Show 2 more

Open Access

https://doi.org/10.1109/jphot.2020.2979776

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Abstract

Mutual interference is a crucial issue for the visible light communication (VLC) systems to be addressed, including both co-channel interference (CCI) and inter-carrier interference (ICI). In this paper, to solve the CCI problem, a novel optical attocell network is introduced, which can be regarded as a hybrid network based on both single frequency network and multi-frequency network. Meanwhile, to eliminate the ICI, a pre-distorted enhanced asymmetrically clipped DC biased optical orthogonal frequency division multiplexing (PEADO-OFDM) approach is designed. In addition, the corresponding properties of PEADO-OFDM are analyzed, and different modulation schemes are employed for downlink and uplink in the same ADO-OFDM modulation framework to reduce the complexity of user processing. Simulation results indicate that the proposed PEADO-OFDM scheme outperforms the conventional ADO-OFDM approach in terms of bit error rate, while the processing latency and computational complexity are greatly reduced at the receiver.

Highlights

The shortage of spectrum has become a major problem in modern wireless communication networks
co-channel interference (CCI) is avoided by a novel optical attocell network which consists of two LED clusters using two different modulation schemes, which can be regarded as a hybrid network based on both multi-frequency network (MFN) and single frequency network (SFN)
It can be seen from the figure that the bit error rate (BER) performance of ACO-orthogonal frequency division multiplexing (OFDM) is almost identical for the conventional ADO-OFDM scheme and the PEADO-OFDM scheme because that the pre-distortion operation will not impact the demodulation process of ACO-OFDM

Summary

Introduction

The shortage of spectrum has become a major problem in modern wireless communication networks. Visible light communication (VLC) has a broad license-free bandwidth, it has been regarded as a candidate scheme of generation wireless networks [1], [2]. Some scholars have the thought of using the orthogonal frequency division multiplexing (OFDM) technology in the VLC systems owing to the inherent robustness against inter-symbol interference and the high spectrum efficiency [3]. The co-channel interference (CCI) will be a crucial problem which interferes the performance of the attocell. The inter-carrier interference (ICI) will exist in some VLC systems with special modulation schemes.

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