On the beamforming design for efficient interference alignment

Authors:
Sang Won Choi;Syed A. Jafar;Sae-Young Chung
Affiliations:
Dept. of EE, KAIST, Daejeon, South Korea;Dept. of EECS, University of California, Irvine, CA;Dept. of EE, KAIST, Daejeon, South Korea
Venue:
IEEE Communications Letters
Year:
2009

Citing 3
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Optimization of interference alignment beamforming vectors

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Abstract

An efficient interference alignment (IA) scheme is developed for K-user single-input single-output frequency selective fading interference channels. The main idea is to steer the transmit beamforming matrices such that at each receiver the subspace dimensions occupied by interference-free desired streams are asymptotically the same as those occupied by all interferences. Our proposed scheme achieves a higher multiplexing gain at any given number of channel realizations in comparison with the original IA scheme, which is known to achieve the optimal multiplexing gain asymptotically.