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Behaviour of outage probability in MISO systems with no channel state information at the transmitter

: Jorswieck, E.A.; Boche, H.

IEEE Information Theory Society:
IEEE Information Theory Workshop 2003. Proceedings : La Sorbonne, Paris, France, 31 March - 4 April 2003
Piscataway, NY: IEEE, 2003
ISBN: 0-7803-7799-0
Information Theory Workshop (ITW) <2003, Paris>
Conference Paper
Fraunhofer HHI ()

It is well known that in terms of the ergodic capacity, the optimum transmit strategy is to allocate equal power to all transmit antennas. In this work, we show that the transmit strategy to equally allocate power to all antennas is not the optimal one. The optimum strategy is to avoid using all available antennas. The optimal number of active antennas depends on the required rate and the SNR. We propose an algorithm which computes the optimum number of active antennas for given available number of transmit antennas, SNR, and rate R. We compare the optimum strategy to equal power allocation.