Combining beamforming and space-time coding using noisy quantized feedback
IEEE Transactions on Communications
Outage probability-based power and time optimization for relay networks
IEEE Transactions on Signal Processing
On multicast beamforming for minimum outage
IEEE Transactions on Wireless Communications
Outage probability of multiple-input single-output (MISO) systems with delayed feedback
IEEE Transactions on Communications
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We study optimal transmission strategies in terms of minimum outage probability for a fading channel with multiple transmit antennas and a single receive antenna. We consider two cases of imperfect channel state information (CSI) feedback: mean feedback and covariance feedback. In both cases, the optimum strategy is shown to be transmission of multiple data streams to the same directions as when maximizing the ergodic channel capacity, but with different power allocation strategies which are closely related to the target rate. In the mean feedback case, the optimal power allocation strategy is also related to the accuracy of the feedback CSI, which affects significantly the achievable outage capacity.