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Appl Opt. 1973 Nov 1;12(11):2616-24. doi: 10.1364/AO.12.002616.

Photocounting array receivers for optical communication through the lognormal atmospheric channel. 1: optimum and suboptimum receiver structures.


The structure of the optimum direct detection array receiver is obtained for a system consisting of an amplitude-stabilized optical source, a lognormal channel, and a bank of photocounting detectors. Additive independent background radiation and detector dark current are taken into account. Both orthogonal and nonorthogonal M-ary signaling formats are considered. Attention is given to detection intervals small in comparison with the correlation time of the atmospherically induced fluctuations. A saddlepoint integration provides an excellent approximation to the optimum processor, resulting in a considerably simplified structure. Suboptimum aperture integration and maximum a posteriori (MAP) receivers are also considered. The performance in related papers (Parts 2 and 3).

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