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In this paper, we propose an iterative transceiver design in a multi-relay multi-user multiple-input multiple-output (MIMO) system. The design criterion is to minimize sum mean squared error (SMSE) under relay sum power constraint (RSPC) where only local channel state information (CSI)s are available at relays. Local CSI at a relay is defined as the CSI of the channel between BS and the relay in the 1 st hop link, and the CSI of the channel between the relay and all users in the 2 nd hop link.doi:10.3837/tiis.2013.11.004 fatcat:zfqashfeb5eltlzg5cciydcvly