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In this paper, we investigate the capacity of a multiple-inputmultiple-output (MIMO) optical intensity channel (OIC) under per-antenna peak-and average-intensity constraints. We first consider the case where the averageintensities of input are required to be equal to preassigned constants due tothe requirement of illumination quality and color temperature. When the channelgraph of the MIMO OIC is strongly connected, we prove that the strongesteigen-subchannel must have positive channel gains, which simplifies thecapacity analysis. Then we derive various capacity bounds by utilizing linearprecoding, generalized entropy power inequality, and QR decomposition, etc.These bounds are numerically verified to approach the capacity in the low orhigh signal-to-noise ratio regime. Specifically, when the channel rank is oneless than the number of transmit antennas, we derive an equivalent capacityexpression from the perspective of convex geometry, and new lower bounds arederived based on this equivalent expression. Finally, the developed results areextended to the more general case where the average intensities of input arerequired to be no larger than preassigned constants.

Capacity Results for Multiple-Input Multiple-Output Optical Wireless Communication With Per-Antenna Intensity Constraints