Using an accurate exponential bound for the Gaussian <i>Q</i>-function, we derive simple approximate closed-form expressions for the average symbol error probability (ASEP) of a free-space optical communication link using subcarrier intensity modulation (SIM) with general-order rectangular quadrature amplitude modulation (QAM) over atmospheric turbulence channels. To model the atmospheric turbulence conditions, the log-normal and the gamma-gamma distribution are used. Extensive numerical and computer simulation results are presented in order to verify the accuracy of the proposed mathematical analysis.
© 2010 Optical Society of America
Original Manuscript: September 21, 2009
Revised Manuscript: November 12, 2009
Manuscript Accepted: December 11, 2009
Published: January 19, 2010
Kostas P. Peppas and Christos K. Datsikas, "Average Symbol Error Probability of General-Order Rectangular Quadrature Amplitude Modulation of Optical Wireless Communication Systems Over Atmospheric Turbulence Channels," J. Opt. Commun. Netw. 2, 102-110 (2010)