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Distributed MISO system capacity over Rayleigh flat fading channels’

Castanheira, D. ; Gameiro, A.

Distributed MISO system capacity over Rayleigh flat fading channels’, Proc IEEE International Symp. on Personal, Indoor and Mobile Radio Commun - PIMRC , Cannes, France, Vol. *, pp. 1 - 5, September, 2008.

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For a Distributed Multiple Input Single Output (DMISO) system a terminal can be connected to all system antennas, but this leads, obviously, to a high processing capacity requirement which is not practical. Since the capacity increase only slightly with the connection of the terminal to more antennas, it is important to evaluate the number of antennas that a terminal must be connected to. Thus in this paper we study the ergodic capacity, for the single-user case, and the respective capacity increase by the user connection to K new antennas, over a Rayleigh flat fading channel. For each case we provide an exact closed-form expression and simple to compute upper/lower bounds. Results show that symmetry in the antenna configuration is good since maintains the capacity increase curve approximately flat. They also show that the maximum capacity increase by the connection to K new antennas is obtained when we have all mean SNR's equal, which happens when all antennas are collocated, and not distributed.