Coherent Optical Wireless Link Employing Phase Estimation with Multiple-Beam, Multiple-Aperture, for Increased Tolerance to Turbulence

We present a BPSK coherent optical wireless link in a multiple-beam, multiple-aperture configuration. The data are recovered using the signal obtained by the coherent addition of a set of maximum likelihood optical phase estimates and a select-largest stage. The proposal offers higher performance than the combining methods commonly used in optical wireless systems with diversity transmission and coherent detection.