On Limits of Wireless Communications in a Fading Environment when UsingMultiple Antennas
Wireless Personal Communications: An International Journal
Transmitter optimization and optimality of beamforming for multiple antenna systems
IEEE Transactions on Wireless Communications
Capacity scaling in MIMO wireless systems under correlated fading
IEEE Transactions on Information Theory
Efficient use of side information in multiple-antenna data transmission over fading channels
IEEE Journal on Selected Areas in Communications
Optimization and tradeoff analysis of two-way limited feedback beamforming systems
IEEE Transactions on Wireless Communications
An upper bound for limited rate feedback MIMO capacity
IEEE Transactions on Wireless Communications
Design and analysis of MIMO joint source channel coding (JSCC) with limited feedback
IEEE Transactions on Wireless Communications
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
Performance analysis of RVQ-based limited feedback beamforming codebooks
ISIT'09 Proceedings of the 2009 IEEE international conference on Symposium on Information Theory - Volume 4
IEEE Transactions on Information Theory
MIMO spatial multiplexing systems with uplink pilot and LDPC codec
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Novel switched interleaving techniques with limited feedback for DS-CDMA systems
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Trellis coded beamforming vector quantization with fractional bits per antenna
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
Limited feedback for temporally correlated MIMO channels with other cell interference
IEEE Transactions on Signal Processing
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We consider a single-user, point-to-point communication system with M transmit and N receive antennas with independent flat Rayleigh fading between antenna pairs. The mutual information of the multi-input/multi-output (MIMO) channel is maximized when the transmitted symbol vector is a Gaussian random vector with covariance matrix Q. The optimal Q depends on how much channel state information is available at the transmitter. Namely, in the absence of any channel state information, the optimal Q is full-rank and isotropic, whereas with perfect channel knowledge, the optimal Q has columns which are the eigenvectors of the channel, and has rank at most min{M, N}. We assume that the receiver can feed back B bits to the transmitter (per codeword). The feedback bits are used to choose the columns of Q from a random set of i.i.d. vectors. We compute the mutual information as a function of both B and the rank of Q. Our results are asymptotic in the number of antennas, and show how much feedback is needed to achieve a rate, which is close to the capacity with perfect channel knowledge at the transmitter.