Adaptive multiple-input multiple-output mode switching for indoor visible light communication system

• 作 者: 郭心悦 李鑫 黄如意
• 机 构: Shanghai Key Lab of Modern Optical System,School of Optical-Electrical and Computing Engineering,Uni
• 出 处: Chinese Optics Letters
• 发表日期: 2017年11期
• 关键词: multiplexing transmit switching indoor correction visible validate receiver adap

We propose and experimentally demonstrate an adaptive multiple-input multiple-output(MIMO) mode switching scheme for an indoor visible light communication system combined with orthogonal frequency division multiplexing modulation.Only requiring 1 bit feedback from the receiver,the MIMO mode at the transmitter switches between spatial multiplexing and transmit diversity adapting to the channel correlation.In such a way,we can take advantage of both spatial multiplexing and transmit diversity,where the spatial multiplexing benefits for its multiplexing gain in the low channel correlation environment,and the transmit diversity is robust to high channel correlation.Experimental results validate the performance improvement over the pure spatial multiplexing or transmit diversity system.With the increasing of the channel correlation,the measured bit error rates of the proposed system are below the 7% pre-forward error correction(pre-FEC) limit of 3.8 × 10~(-3)when the transmitted data rate is 50 Mb/s,and below the 20% pre-FEC threshold of 5.0 × 10~(-2) when the transmitted data rate is raised up to 100 Mb/s.

We propose and experimentally demonstrate an adaptive multiple-input multiple-output (MIMO) mode switching scheme for an indoor visible light communication system combined with orthogonal frequency division multiplexing modulation. Onely 1 bit feedback from the receiver, the MIMO mode at the transmitter switches between spatial multiplexing and transmit diversity adapting to the channel correlation.In such a way, we can take advantage of both spatial multiplexing and transmit diversity, where the spatial multiplexing benefits for its multiplexing gain in the low channel correlation environment, and the transmit diversity is robust to high channel correlation. Experimental results validate the performance improvement over the pure spatial multiplexing or transmit diversity system. With the increasing of the channel correlation, the measured bit error rates of the proposed system are below the 7% pre-forward error correction ( pre-FEC) limit of 3.8 × 10 -3 (when the transmitted data rate is 50 Mb / s, and below the 20% pre-FEC threshold of 5.0 × 10 -2 (when the transmitted data rate is raised up to 100 Mb / s.