On the Nakagaini-m crosscorrelation function

The generic-order crosscorrelation function between two non-identically distributed Nakagami-m fading processes is derived assuming a space-frequency diversity scenario with horizontally spaced omnidirectional antennas at the mobile station. Our result allows for distinct fading parameters, power imbalance, antenna, spacing/angle, and frequency separation. Based on it, the coherence bandwidth and the coherence time/distance of the Nakagami-m channel are also obtained. The latter is found to be practically identical to the coherence time/distance of the Rayleigh channel.