Date Added: Sep 2012
This paper focuses on turbo packet combining for multi-relay systems operating over Multiple-Input-Multiple-Output (MIMO) broadband channels. The authors consider a relaying protocol that represents a generalization of the classical point-to-point hybrid Automatic Repeat reQuest (ARQ). In this protocol, relays play the role of packet re-transmitters instead of the source. Packet combining has been widely studied for the point-to-point hybrid ARQ, and it has been shown that the virtual-antenna-concept-based combining strategy exhibits BLock Error Rate (BLER) performance that is very close to the matched filter bound. However, the extension of this combining strategy to cooperative communications operating under the framework of broadband MIMO channels is not straightforward.