In this paper, we propose an indoor visible light communication (VLC) system which makes use of Walsh precoding and multiple\nlight-emitting diodes (LEDs) at the transmitter for multiplexing the data. The proposed VLC system is based on intensity\nmodulation and uses the notion of spatial modulation for communicating the positive and negative values of the synthesized\ntransmit signal using signal processing technique at the transmitter. We also illustrate the flexibility, ability, and easiness of the\nsystem to configure well in a multiuser environment. We have also developed a near-maximum likelihood (ML) detection\ntechnique for efficiently decoding the data bits at the receiver. The proposed near-ML reduces the search space involved in ML\ntechnique by using the initial ZF solution. The results of the simulation studies illustrate that the proposed technique offers a\nhigher data rate and good bit error rate (BER) performance in indoor VLC environments.
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