Synchronisation algorithm based on zero correlation code pair for OFDM-based VLC systems

What is it about?

Visible light communication (VLC) system based on orthogonal frequency division multiplexing (OFDM) is promising for its ability to link a huge number of devices with high reliability and low latency. However, OFDM-based VLC systems are very sensitive to the symbol timing offsets. Thus, synchronization algorithm is very important for OFDM-based VLC system. In this paper, we firstly propose zero correlation code pair (ZCC pair) and investigate the periodical impulse-shaped correlation property of ZCC pair. Then we propose a novel timing offset estimation algorithm based on ZCC pair. The preamble is processed via peak-to-average power ratio (PAPR) reduction algorithms to overcome the PAPR problem in VLC systems. This algorithm achieves high accuracy and has low synchronization error probability. The effectiveness of our proposed algorithm has been demonstrated using computer simulation under non-light-of-sight (NLoS) VLC and Gaussian channels. The results show that our algorithm outperforms the Schmidl Cox’s and Park’s algorithms in terms of synchronization error probability and MSE of timing error.

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