The Outage Performance of Realtime Transmission in Multiple Asynchronous Relays Enhanced OFDM System

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This paper considers the outage performance of multiple relays transmission in Orthogonal Frequency Division Multiplexing (OFDM) systems. Relaying has been suggested in general to improve the reliability of wireless systems significantly and is therefore a candidate for wireless industrial communication systems that need to meet tough latency and outage requirements. Different from previous works, this paper takes synchronization mismatch of hardware processing time at multiple relays into account and characterizes the performance impact of such asynchronous relays on the reliability of the system. The authors focus especially on the case where the transceivers do not have instantaneous channel state information but still need to fulfill tough reliability and latency constraints.