Interpolation Based Unitary Precoding for Spatial Multiplexing MIMO-OFDM With Limited Feedback | IEEE Journals & Magazine | IEEE Xplore

Interpolation Based Unitary Precoding for Spatial Multiplexing MIMO-OFDM With Limited Feedback


Abstract:

Spatial multiplexing with linear precoding is a simple technique for achieving high spectral efficiency in multiple-input multiple-output orthogonal frequency division m...Show More

Abstract:

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).
Published in: IEEE Transactions on Signal Processing ( Volume: 54, Issue: 12, December 2006)
Page(s): 4730 - 4740
Date of Publication: 31 December 2006

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