QoS Analysis of Cognitive Radios Employing HARQ
Sami Akin, Marwan Hammouda, J\"urgen Peissig

TL;DR
This paper analyzes the performance of cognitive radio systems using HARQ protocols under QoS constraints, considering imperfect sensing and hybrid spectrum access strategies, providing analytical models and numerical validation.
Contribution
It introduces a novel analytical framework for modeling cognitive radios with HARQ under QoS, incorporating imperfect sensing and hybrid spectrum access techniques.
Findings
Derived state-transition probabilities for the system
Calculated packet-loss rates under various conditions
Validated analytical results with numerical simulations
Abstract
Recently, the demand for faster and more reliable data transmission has brought up complex communications systems. As a result, it has become more difficult to carry out closed-form solutions that can provide insight about performance levels. In this paper, different from the existing research, we study a cognitive radio system that employs hybrid-automatic-repeat-request (HARQ) protocols under quality-of-service (QoS) constraints. We assume that the secondary users access the spectrum by utilizing a strategy that is a combination of underlay and interweave access techniques. Considering that the secondary users imperfectly perform channel sensing in order to detect the active primary users and that there is a transmission deadline for each data packet at the secondary transmitter buffer, we formulate the state-transition model of the system. Then, we obtain the state-transition…
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Taxonomy
TopicsCognitive Radio Networks and Spectrum Sensing · Advanced Queuing Theory Analysis · Wireless Communication Networks Research
