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IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, VOL. 26, NO. 8, OCTOBER 2008 1397 Grassmannian Beamforming for MIMO
 

Summary: IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, VOL. 26, NO. 8, OCTOBER 2008 1397
Grassmannian Beamforming for MIMO
Amplify-and-Forward Relaying
Behrouz Khoshnevis, Wei Yu, and Raviraj Adve
Abstract--We consider the problem of beamforming codebook
design for limited feedback half-duplex multiple-input multiple-
output (MIMO) amplify-and-forward (AF) relay system. In the
first part of the paper, the direct link between the source
and the destination is ignored. Assuming perfect channel state
information (CSI), we show that the source and the relay should
map their signals to the dominant right singular vectors of
the source-relay and relay-destination channels. For the limited
feedback scenario, we prove the appropriateness of Grassman-
nian codebooks as the source and relay beamforming codebooks
based on the distributions of the optimal source and relay
beamforming vectors. In the second part of the paper, the
direct link is considered in the problem model. Assuming perfect
CSI, we derive the optimization problem that identifies the
optimal source beamforming vector and show that the solution
to this problem is uniformly distributed on the unit sphere for

  

Source: Adve, Raviraj - Department of Electrical and Computer Engineering, University of Toronto

 

Collections: Engineering