IEEE Transactions on Signal Processing
IEEE Transactions on Signal Processing
Multiple peer-to-peer communications using a network of relays
IEEE Transactions on Signal Processing
Joint optimization of a dynamic queue scheduling scheme for the provision of QoS in WLAN
Proceedings of the 5th International ICST Mobile Multimedia Communications Conference
Generalized co-phasing for multiple transmit and receive antennas
IEEE Transactions on Wireless Communications
On multicast beamforming for minimum outage
IEEE Transactions on Wireless Communications
Quasi-convex designs of max-min linear BC precoding with outage QoS constraints
ISWCS'09 Proceedings of the 6th international conference on Symposium on Wireless Communication Systems
Robust cognitive beamforming with bounded channel uncertainties
IEEE Transactions on Signal Processing
IEEE Transactions on Signal Processing
EURASIP Journal on Advances in Signal Processing
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A new approach to multi-antenna downlink beam- forming is proposed that provides an improved robustness against uncertainty in the downlink channel covariance matrices caused by errors between the actual and estimated channel values. The proposed method uses the knowledge of the statistical distribution of such a covariance uncertainty to minimize the total downlink transmit power under the constraint that the outage probability does not exceed a certain threshold value. Although our approach initially leads to a non-convex optimization problem, it can be reformulated in a convex form using the semidefinite relaxation technique. The resulting convex optimization problem can be solved efficiently using the well-established interior point methods. Computer simulations verify performance improvements of the proposed technique as compared to the robust transmit beamforming method based on the worst-case performance optimization with judicious selection of the upper bounds on channel covariance errors.