On the Capacity of Multiple Antenna Systems in Rician Fading

Details On the Capacity of Multiple Antenna Systems in Rician Fading On the Capacity of Multiple Antenna Systems in Rician Fading

2005-01-21

arxiv.org/abs/cs/0501051v1

Computer Science

Information Theory

22 pages, 9 figures, to be published in IEEE Transaction in Wireless Communications

Scientific paper

The effect of Rician-ness on the capacity of multiple antenna systems is investigated under the assumption that channel state information (CSI) is available only at the receiver. The average-power-constrained capacity of such systems is considered under two different assumptions on the knowledge about the fading available at the transmitter: the case in which the transmitter has no knowledge of fading at all, and the case in which the transmitter has knowledge of the distribution of the fading process but not the instantaneous CSI. The exact capacity is given for the former case while capacity bounds are derived for the latter case. A new signalling scheme is also proposed for the latter case and it is shown that by exploiting the knowledge of Rician-ness at the transmitter via this signalling scheme, significant capacity gain can be achieved. The derived capacity bounds are evaluated explicitly to provide numerical results in some representative situations.

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