Real World Feasibility of Interference Alignment Using MIMO-OFDM Channel Measurements


Omar El Ayach and Steven W. Peters and Robert W. Heath, Jr.


Proceedings of IEEE Military Communication Conference (MILCOM), Boston, MA, October. 2009.


Interference alignment (IA) has been shown to achieve linear sum capacity growth, at high SNR, with the number of users in the interference channel by cooperatively precoding transmitted signals to align interference subspaces at the receivers. The theory of IA was derived under assumptions about the richness of the propagation channel; practical channels do not guarantee such ideal decorrelation. This paper presents the first experimental study of IA in measured interference channel and shows that IA achieves the claimed scaling factors in a variety of measured channel settings for a 3 user, 2 antennas per node setup.

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