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Adaptive two-way relaying and outage analysis

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4 Author(s)
Qiang Li ; Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore ; See Ho Ting ; Pandharipande, A. ; Yang Han

This paper analyzes the outage performance of cooperative protocols for the two-way relaying model in which a half-duplex relay assists in the bi-directional communication of two terminals. We first define the outage events and derive closed form results for the outage probabilities of conventional nonadaptive amplify-and-forward (AF) and decode-and-forward (DF) two-way relaying protocols.We then consider a simple adaptive protocol in the two-way relaying scenario, which switches between AF and DF depending on the decodability of the two bi-directional data streams at the relay. We also derive the outage probability for this adaptive scheme in closed form expressions, and our results show that it always outperforms the non-adaptive schemes. All the closed form results derived in this paper are applicable to arbitrary channel gains between terminals.

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Wireless Communications, IEEE Transactions on  (Volume:8 ,  Issue: 6 )