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The prospect of base station (BS) cooperation leading to joint combining atwidely separated antennas has led to increased interest in macrodiversitysystems, where both sources and receive antennas are geographicallydistributed. In this scenario, little is known analytically about channelcapacity since the channel matrices have a very general form where each pathmay have a different power. Hence, in this paper we consider the ergodic sumcapacity of a macrodiversity MIMO system with arbitrary numbers of sources andreceive antennas operating over Rayleigh fading channels. For this system, wecompute the exact ergodic capacity for a two-source system and a compactapproximation for the general system, which is shown to be very accurate over awide range of cases. Finally, we develop a highly simplified upper-bound whichleads to insights into the relationship between capacity and the channelpowers. Results are verified by Monte Carlo simulations and the impact oncapacity of various channel power profiles is investigated

Ergodic Sum Capacity of Macrodiversity MIMO Systems in Flat Rayleigh Fading