Approximating Ergodic Mutual Information for Mixture Gamma Fading Channels With Discrete Inputs.

To evaluate the performance of wireless multi-path channels with discrete inputs, this letter investigates the ergodic mutual information (EMI) of a generalized fading type named mixture gamma distribution (MGD) under M-ary quadrature amplitude modulation (M-QAM) signaling. An accurate closed-form expression for the EMI is developed to approximate the exact value. The MGD fading can be specialized...