Experimental Demonstration of Compressive Sensing-Based Channel Estimation for MIMO-OFDM VLC

Bangjiang Lin*, Zabih Ghassemlooy, Junxiang Xu, Qiwei Lai, Xiaohuan Shen, Xuan Tang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The combination of optical multiple inputs multiple outputs (MIMO) and orthogonal frequency division multiplexing (OFDM) is a viable option to overcome the bandwidth limitation and increase the transmission data rate in visible light communications (VLC). In MIMO-VLC systems with pre-coders and equalizers it is essential to know the perfect channel state information. Traditional channel estimation (CE) techniques such as least square (LS) are widely used in MIMO-VLC systems. However, the LS algorithm is subject to noise enhancement, which results in lower estimation accuracy. Besides, the pilot tones between different transmitters should be orthogonal either in time or frequency domains, which increase the overhead. Since the physical VLC channel model exhibits strong sparsity, we propose a CE method based on compressive sensing (CS) for MIMO-OFDM VLC systems. The feasibility of the proposed CS-CE method is verified by experimental demonstration of a 2\times 2 MIMO-OFDM VLC system. The experimental results show that, the proposed method offers improved bit error rate performance with reduced overhead compared with the LS-CE scheme.

Original languageEnglish
Article number9027817
Pages (from-to)1027-1030
Number of pages4
JournalIEEE Wireless Communications Letters
Volume9
Issue number7
Early online date9 Mar 2020
DOIs
Publication statusPublished - 9 Jul 2020

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