EURASIP Journal on Applied Signal Processing
On the constrained stochastic gradient algorithm: model, performance, and improved version
IEEE Transactions on Signal Processing
Robust cognitive beamforming with partial channel state information
IEEE Transactions on Wireless Communications
Conversion of the spatio-temporal correlation from uplink to downlink in FDD systems
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
Multicell multicast beamforming with delayed SNR feedback
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Robust precoding with Bayesian error modeling for limited feedback MU-MISO systems
IEEE Transactions on Signal Processing
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The downlink channel covariance matrix (DCCM) is of vital importance in determining downlink beamforming weights for base station (BS) antenna array systems. For the frequency-division-duplex (FDD) mode, DCCM is difficult to obtain due to a lack of direct measurement of downlink channel responses. In this paper, a novel technique is proposed for estimating DCCM using uplink channel responses only, which does not need direction-of-arrival (DOA) estimation and its association. The downlink beamforming scheme is then proposed for wireless DS-CDMA systems, using the obtained DCCM information together with the so-called virtual uplink beamforming and power control technique. Computer simulations show that using the BS antenna array together with this new beamforming technique can provide larger system capacity than traditional DOA-based approaches, which just direct the main beam toward the desired user