  The research presents a procedure of the closed-form average bit error rate
evaluation for wireless communication systems in the presence of multipath
fading. A generalization of the classical moment generating function is
applied, and a connection between the Hankel-type contour-integral
representation of the Marcum Q-function and Gauss Q-function is obtained and
applied to the analytic derivation of the quadrature amplitude modulated signal
average bit error rate in the presence of Nakagami-m fading. The correctness of
the obtained solution was verified, and its computational efficiency (in terms
of accuracy and time gain), compared with the prevailing approximation, was
demonstrated. The proposed methodology can be extended to a wide variety of
composite channels.
