Spatial Multiplexing in Optical Wireless MIMO Communications Over Indoor Environment

Daisuke TAKASE  Tomoaki OHTSUKI  

Publication
IEICE TRANSACTIONS on Communications   Vol.E89-B   No.4   pp.1364-1371
Publication Date: 2006/04/01
Online ISSN: 1745-1345
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Optical Wireless Communications
Keyword: 
optical wireless multiple-input multiple-output (OMIMO),  subcarrier multiplexing (SCM),  nonlinearity of LD,  zero forcing (ZF),  intermodulation distortion (IMD),  optical modulation index (OMI),  

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Summary: 
We propose optical wireless multiple-input multiple-output (OMIMO) communications to achieve high speed transmission with a compact transmitter and receiver. In OMIMO, by using zero forcing (ZF), minimum mean square error (MMSE) or other detection techniques, we can eliminate the interference from the other optical transmit antennas. In this paper, we employ ZF as the detection technique. We analyze the signal-to-interference-plus-noise ratio (SINR) and the bit error rate (BER) of the proposed OMIMO with a linear array and a square array of optical transmit and receive antennas, where we employ subcarrier multiplexing (SCM) for each optical transmit antenna. Note that the proposed OMIMO is applicable to other arrangements of optical transmit and receive antennas. We show that the proposed OMIMO system can realize MIMO multiplexing and achieve high speed transmission by correctly aligning the optical transmit and receive antennas and the transmitter semiangle.