The invention relates to the technical field of rail
train communication, in particular to a rail
train multiple-input-multiple-output
wireless optical communication system. The
system comprises a vehicle-mounted network unit and a
signal box. At least two light receiving devices are arranged on the outer side of the top of each
train compartment. An optical splitter and at least two light emitting devices are arranged on a cross arm of each overhead
contact system hard crossing supporting column above the rail, a
signal box is arranged on any overhead
contact system hard crossing supporting column in every N overhead
contact system hard crossing supporting columns, and a train-mounted network unit is arranged in a train
carriage. According to the invention, the light beams emitted by thetwo light emitting devices on the cross arm of the same
overhead line system hard cross strut carry the same
data stream; the
frequency spectrum utilization rate is doubled compared with a diversity mode, the light beams emitted by the light emitting devices on the cross arms of the different
overhead line system hard crossing supporting columns carry different data streams, the wavelengths are different, and the problem of interference between
wireless light beams is effectively solved.