A Simple and Accurate Approximation to the SEP of Rectangular QAM in Arbitrary Nakagami-m Fading Channels

Recently, Karagiannidis presented a closed-form solution for an integral which can be used to compute the average symbol error probability of general order rectangular quadrature amplitude modulation (QAM) in Nakagami-m fading channels with integer fading parameters. In this letter, using an accurate exponential bound for the Gaussian Q-function, we derive a simple approximate solution for that integral. In particular, the solution can be used to compute the average SEP of general order rectangular QAM over arbitrary Nakagami-m fading. Numerical results are presented to verify the accuracy of the solution