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ARQ Protocols in Cognitive Decode-and-Forward Relay Networks: Opportunities Gain

Zongsheng Zhang,Qi-hui Wu,Jinlong Wang

Published 2015 in Radioengineering

ABSTRACT

In this paper, two novel automatic-repeat-request (ARQ) based protocols are proposed, which exploit coopera- tion opportunity inherent in secondary retransmission to cre- ate access opportunities. If the signal was not decoded cor- rectly by destination, another user can be acted as a relay to reduce retransmission rounds by relaying the signal. For comparison, we also propose a Direct ARQ Protocol. Specif- ically, we derive the exact closed-form outage probability of three protocols, which provides an effective means to evalu- ate the effects of several parameters. Moreover, we propose a new metric to evaluate the performance improvement for cognitive networks. Finally, Monte Carlo simulations were presented to validate the theory analysis, and a comparison is made among the three protocols.

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