Feasibility of Interference Alignment of Measured MIMO-OFDM Channels

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Executive Summary

Interference Alignment (IA) has been shown to provide all users of an interference channel with half the capacity achievable in an interference free point-to-point link resulting in linear sum capacity scaling with the number of users in the high SNR regime. The linear scaling is achieved by cooperatively precoding transmitted signals to align interference subspaces at the receivers, effectively reducing the number of discernible interferers. The theory of IA was derived under assumptions about the richness of the propagation channel; practical channels do not guarantee such ideal characteristics. This paper presents the first experimental study of IA in measured Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) interference channels.

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