Predictive transmit beamforming for MIMO-OFDM in time-varying channels with limited feedback
IWCMC '07 Proceedings of the 2007 international conference on Wireless communications and mobile computing
Limited feedback beamforming over temporally-correlated channels
IEEE Transactions on Signal Processing
Closed-loop cross-layer SDMA designs with outdated CSIT
IEEE Transactions on Wireless Communications
Covariance based linear precoding in amplify-and-forward cooperative networks
ISCIT'09 Proceedings of the 9th international conference on Communications and information technologies
Simplified maximum-likelihood precoder selection for limited feedback spatial multiplexing systems
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Event-driven optimal feedback control for multiantenna beamforming
IEEE Transactions on Signal Processing
Statistical Transceiver Designs with ICI Reduction for MIMO-OFDM Systems
Wireless Personal Communications: An International Journal
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Spatial multiplexing with linear precoding is a simple technique for achieving high spectral efficiency in multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems. Linear precoding requires channel state information for each OFDM subcarrier, which can be achieved using feedback. To reduce the amount of feedback, this paper proposes a limited feedback architecture that combines precoder quantization with a special matrix interpolator. In the proposed system, the receiver sends information about a fraction of the precoding matrices to the transmitter and the transmitter reconstructs the precoding matrices for all the subcarriers. A new interpolator is proposed inspired by spherical interpolation that respects the orthogonal columns of the precoding matrices and the performance invariance to right multiplication by a unitary matrix. The interpolator is parameterized by a set of unitary matrices; a construction of a suitable set is briefly described. Simulations illustrate the performance of limited feedback precoding with coding, estimation or prediction error, and time variation for bit error rate (BER), mutual information, and mean squared error (MSE)