I. Introduction
The growing demand for data communications require bandwidth-efficient transmission techniques. A serious challenge to reliable communication in wireless systems is the time-varying multipath fading environment, which causes the received SNR to vary randomly. The fading distribution depends on the environment. For example, if a line of site (LOS) exists between the transmitter and the receiver in addition to the multipath reception, the fading process can be modeled by a Rician distribution [1]. Another popular fading model is the Nakagami distribution [2], which provides a family of distributions that match measurements in different propagation environments [3].