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Author
Title Interference alignment in real world environments
URL
Publication Date
Date Accessioned
Discipline/Department Electrical and Computer Engineering
University/Publisher University of Texas – Austin
Abstract 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 precoding transmitted signals to align interference subspaces at the receivers, given channel knowledge of all transmit-receive pairs, 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. We show that IA achieves the claimed scaling factors in a wide variety of measured channel settings for a 3 user, 2 antennas per node setup. In addition to verifying the claimed performance, we characterize the effect of several realistic system imperfections such as channel estimation error, feedback delay, and channel spatial correlation, on sum rate performance.
Subjects/Keywords Interference; Interference channel; MIMO; Interference alignment; Measurements
Contributors Heath, Robert W., Ph. D. (advisor); Sanghavi, Sujay (committee member)
Language en
Country of Publication us
Record ID handle:2152/ETD-UT-2010-05-988
Repository texas
Date Retrieved
Date Indexed 2018-10-22
Note [] text; [department] Electrical and Computer Engineering;

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