Free Space Optical Communication Based on V_BLAST

V-BLAST is a technology combined space multiplexing with space diversity. It has high spectrum efficiency, so, it is available to free space optical communication. In this paper, according to the characteristic of atmosphere channel, channel model in the free space optical communication is described, and the coding and decoding principle of V-BLAST fit for free space optical communication is proposed and its channel capacity was analyzed. Moreover, the V-BLAST channel capacity and error rate was compared to the system which did not use V-BLAST structure by emulation experiment. The result shows that when the number of receiver antenna is more than the number of transmit antenna, the channel capacity will be improved direct proportion with transmit antenna number, and the BER capability will be improved effectively. It has better performance to overcome the scintilla effect caused by atmospheric turbulence.