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This paper studies bandwidth-efficient transmission protocol for a two-hop communication network with one source, one destination, and two assisting relays. The two-path successive relaying protocol is considered where the source/destination transmits/receives continuously in time, and two half-duplex relays both operating in a Time-Division-Duplex (TDD) mode successively in turn forward messages from source to destination. By mimicking a full-duplex relay with two alternating half-duplex relays, this protocol ideally achieves the same bandwidth efficiency. However, a major issue for this protocol to be effectively implemented is to tackle the Inter-Relay Interference (IRI), which occurs when one relay listens to the source, it is interfered with by the other relay that transmits to the destination.
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