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Average symbol error rate for M-ary quadrature amplitude modulation in generalized atmospheric turbulence and misalignment errors
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机译：Average symbol error rate for M-ary quadrature amplitude modulation in generalized atmospheric turbulence and misalignment errors
A framework is presented for the analysis of average symbol error rate (SER) for M-ary quadrature amplitude modulation in a free-space optical communication system. The standard probability density function (PDF)-based approach is extended to evaluate the average SER by representing the Q-function through its Meijer's G-function equivalent. Specifically, a converging power series expression for the average SER is derived considering the zero-boresight misalignment errors in the receiver side. The analysis presented here assumes a unified expression for the PDF of channel coefficient which incorporates the M-distributed atmospheric turbulence and Rayleigh-distributed radial displacement for the misalignment errors. The analytical results are compared with the results obtained using Q-function approximation. Further, the presented results are supported by the Monte Carlo simulations. (C) 2016 Society of Photo-Optical Instrumentation Engineers (SPIE)
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