  The fluctuating two-ray (FTR) fading model provides a much better fit than
other fading models for small-scale fading measurements in millimeter wave
communications. In this paper, using a mixture of gamma distributions, new
exact analytical expressions for the probability density and cumulative
distribution functions of the FTR distribution with arbitrary fading parameters
are presented. Moreover, the performance of digital communication systems over
the FTR fading channel is evaluated in terms of the channel capacity and the
bit error rate. The interaction between channel fading parameters and system
performance is further investigated. Our newly derived results extend and
complement previous knowledge of the FTR fading model.
