Diversity performance of quantized unitary precoders
Proceedings of the 2006 international conference on Wireless communications and mobile computing
Optimal limited feedback technique for small size and low rate MIMO systems
Proceedings of the 2006 international conference on Wireless communications and mobile computing
A diversity guarantee and SNR performance for unitary limited feedback MIMO systems
EURASIP Journal on Advances in Signal Processing
Feedback quantization for linear precoded spatial multiplexing
EURASIP Journal on Advances in Signal Processing
EURASIP Journal on Wireless Communications and Networking
EUNICE '09 Proceedings of the 15th Open European Summer School and IFIP TC6.6 Workshop on The Internet of the Future
Optimized non-unitary linear precoding for orthogonal space-time block codes
IEEE Communications Letters
Combining beamforming and space-time coding using noisy quantized feedback
IEEE Transactions on Communications
Limited feedback beamforming over temporally-correlated channels
IEEE Transactions on Signal Processing
Transmit equal gain precoding in Rayleigh fading channels
IEEE Transactions on Signal Processing
IEEE Transactions on Wireless Communications
Closed-loop cross-layer SDMA designs with outdated CSIT
IEEE Transactions on Wireless Communications
Progressive refinement of beamforming vectors for high-resolution limited feedback
EURASIP Journal on Advances in Signal Processing - Multiuser MIMO Transmission with Limited Feedback, Cooperation, and Coordination
Network beamforming using relays with perfect channel information
IEEE Transactions on Information Theory
WSEAS Transactions on Signal Processing
IEEE Transactions on Information Theory
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Using limited feedback in power allocation design for a two-hop relay OFDM system
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Event-driven optimal feedback control for multiantenna beamforming
IEEE Transactions on Signal Processing
On distributed antenna systems with limited feedback precoding: opportunities and challenges
IEEE Wireless Communications
Optimization of Feedback for Adaptive MIMO Transmissions Over Time Varying Channels
Wireless Personal Communications: An International Journal
Exploiting channel angular domain information for precoder design in distributed antenna systems
IEEE Transactions on Signal Processing
Differential feedback of MIMO channel gram matrices based on geodesic curves
IEEE Transactions on Wireless Communications
Wireless Personal Communications: An International Journal
Hi-index | 35.82 |
Orthogonal space-time block codes (OSTBCs) are a class of easily decoded space-time codes that achieve full diversity order in Rayleigh fading channels. OSTBCs exist only for certain numbers of transmit antennas and do not provide array gain like diversity techniques that exploit transmit channel information. When channel state information is available at the transmitter, though, precoding the space-time codeword can be used to support different numbers of transmit antennas and to improve array gain. Unfortunately, transmitters in many wireless systems have no knowledge about current channel conditions. This motivates limited feedback precoding methods such as channel quantization or antenna subset selection. This paper investigates a limited feedback approach that uses a codebook of precoding matrices known a priori to both the transmitter and receiver. The receiver chooses a matrix from the codebook based on current channel conditions and conveys the optimal codebook matrix to the transmitter over an error-free, zero-delay feedback channel. A criterion for choosing the optimal precoding matrix in the codebook is proposed that relates directly to minimizing the probability of symbol error of the precoded system. Low average distortion codebooks are derived based on the optimal codeword selection criterion. The resulting design is found to relate to the famous applied mathematics problem of subspace packing in the Grassmann manifold. Codebooks designed by this method are proven to provide full diversity order in Rayleigh fading channels. Monte Carlo simulations show that limited feedback precoding performs better than antenna subset selection.