MIMO channel capacity for the distributed antenna

We examine the multi-input multi-output (MIMO) channel capacity where one side of the link constitutes a largely spaced antenna array, e.g. distributed antenna system (DAS), which prompts the need to model the channel that has both microscopic and macroscopic fading. Specifically, we consider a MIMO system comprising M antennas co-located at one side of the link and N largely separated ports each with L antennas colocated within a port at the other, named as generalized distributed antenna system (GDAS). We assume independent macroscopic and microscopic fading between ports and common macroscopic but independent microscopic fading at each antenna in a port. Using a simple composite fading channel model, a Rayleigh-lognormal composite fading, the influence of the macroscopic diversity as well as the microscopic diversity on the channel capacity, especially the outage capacity, of the MIMO GDAS is investigated for both the uplink and the downlink.