EURASIP Journal on Advances in Signal Processing
EURASIP Journal on Wireless Communications and Networking
Proceedings of the 2009 International Conference on Wireless Communications and Mobile Computing: Connecting the World Wirelessly
Mode switching for the multi-antenna broadcast channel based on delay and channel quantization
EURASIP Journal on Advances in Signal Processing - Multiuser MIMO Transmission with Limited Feedback, Cooperation, and Coordination
Bit-interleaved coded multiple beamforming with imperfect CSIT
IEEE Transactions on Communications
On source transmission over MIMO channels with limited feedback
IEEE Transactions on Signal Processing
Kerdock codes for limited feedback precoded MIMO systems
IEEE Transactions on Signal Processing
An upper bound for limited rate feedback MIMO capacity
IEEE Transactions on Wireless Communications
Robust precoder adaptation for MIMO links with noisy limited feedback
IEEE Transactions on Information Theory
Network beamforming using relays with perfect channel information
IEEE Transactions on Information Theory
WSEAS Transactions on Signal Processing
A fast encoding algorithm for a MIMO system with finite-bit feedback
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Capacity of a multiple-antenna fading channel with a quantized precoding matrix
IEEE Transactions on Information Theory
Limited feedback for temporally correlated MIMO channels with other cell interference
IEEE Transactions on Signal Processing
Differential feedback of MIMO channel gram matrices based on geodesic curves
IEEE Transactions on Wireless Communications
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This paper investigates the problem of transmit beamforming in multiple-antenna spatial multiplexing (SM) systems employing a finite-rate feedback channel. Assuming a fixed number of spatial channels and equal power allocation, we propose a new criterion for designing the codebook of beamforming matrices that is based on minimizing an approximation to the capacity loss resulting from the limited rate in the feedback channel. Using the criterion, we develop an iterative design algorithm that converges to a locally optimum codebook. Under the independent identically distributed channel and high signal-to-noise ratio (SNR) assumption, the effect on channel capacity of the finite-bit representation of the beamforming matrix is analyzed. Central to this analysis is the complex multivariate beta distribution and tractable approximations to the Voronoi regions associated with the code points. Furthermore, to compensate for the degradation due to the equal power allocation assumption, we propose a multimode SM transmission strategy wherein the number of data streams is determined based on the average SNR. This approach is shown to allow for effective utilization of the feedback bits resulting in a practical and efficient multiple-input multiple-output system design