Switching MIMO System with Adaptive OFDM Modulation for Indoor Visible Light Communication

摘要

In this paper, we propose and experimentally demonstrate a switching multiple input and multiple output (MIMO) system combining with adaptive orthogonal frequency division multiplexing (OFDM) modulation for high-speed indoor visible light communications.The adaptiveOFDMmodulation, which is realized by power and bit allocation onOFDMsubchannels, is utilized to achieve themaximum channel capacity under a given target bit error rate (BER).Meanwhile, the MIMOmode switches between spatial multiplexing and transmit diversity adapting to the channel correlation, where the modulation order solved by adaptive OFDMmodulation is chosen as the switching criterion.Experimental results validate data rates improvement over the pure spatial multiplexing and the pure transmit diversity system, where BERs are all below the 7% preforward error correction (pre-FEC) threshold of 3.8 × 10?3 in experiments.