An algorithm to reconstruct the constellations based on the superposed character in the Multi-dimensional transmission VLC system

Abstract

In the Intensity Modulation and Direct Detection (IM-DD) based Multi-dimensional Visible Light Communication (VLC) system, we display different kinds of constellations by using superposed character. An algorithm named Cyclic Delay Diversity (CDD) is used to reduce the superposed signal order at the transmitter, it improves the data rate to 1.6 Gbps with the Bit Error Rate (BER) under the threshold in the Multiple Input Single Output (MISO) VLC system. Although CDD is a common method used in the Physical Downlink Shared Channel (PDSCH) in Long Term Evolution (LTE), it brings an unexpected result in the VLC system. To our acknowledge, this is the first time to discuss the superposed constellations issue detailly and may provide a bran-new idea in the Multiple Input Multiple Output (MIMO)/MISO VLC system or IM-DD system in the following researches.