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Summary: 1
Beamforming with Limited Feedback in
Amplify-and-Forward Cooperative Networks
Yi Zhao, Raviraj Adve and Teng Joon Lim
Dept. of Electrical and Computer Engineering,
University of Toronto,
M5S3G4, Canada.
E-mail: zhaoyi, rsadve, limtj@comm.utoronto.ca.
Abstract-- A relay selection approach has previously been
shown to outperform repetition-based scheduling for both
amplify-and-forward (AF) and decode-and-forward (DF) coop-
erative networks. The selection method generally requires some
feedback from the destination to the relays and the source, raising
the issue of the interplay between performance and feedback
rate. In this letter, we treat selection as an instance of limited-
feedback distributed beamforming in cooperative AF networks,
and highlight the differences between transmit beamforming
in a traditional multi-input single-output (MISO) system and
the distributed case. Specifically, Grassmannian line packing
(GLP) is no longer the optimal codebook design, and orthogonal
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