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 1st hop link, and the CSI of the channel between the relay and all users in the 2nd hop link. Exploiting BS transmitter structure which is concatenated with block diagonalization (BD) precoder, each relay's precoder can be determined using local CSI at the relay. The proposed scheme is based on sequential iteration of two stages; stage 1 determines BS transmitter and relay precoders jointly with SMSE duality, and stage 2 determines user receivers. We verify that the proposed scheme outperforms simple amplify-and-forward (SAF), minimum mean squared error (MMSE) relay, and an existing good scheme of  in terms of both SMSE and sum-rate performances.
|Number of pages||20|
|Journal||KSII Transactions on Internet and Information Systems|
|Publication status||Published - 2013 Nov 29|
All Science Journal Classification (ASJC) codes
- Information Systems
- Computer Networks and Communications