Robust Joint Linear Precoding for AF MIMO Relay Broadcast Systems with Limited Feedback

Jun ZOU  Ming DING  Hanwen LUO  

IEICE TRANSACTIONS on Communications   Vol.E94-B   No.3   pp.848-851
Publication Date: 2011/03/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.848
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
precoding,  MIMO relay,  MMSE,  limited feedback,  

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This letter proposes a robust joint linear precoding scheme based on the minimum mean squared error (MMSE) criterion for amplify-and-forward (AF) multiple-input multiple-output (MIMO) relay broadcast systems with limited feedback, where only the quantized channel direction information (CDI) of the forward channel is available for the base station (BS) and the relay station (RS). The proposed scheme employs an iterative algorithm which alternately optimizes the BS and RS precoders to jointly minimize the expected MSE conditioned on the quantized CDI.