A New Approach of Overlay Method for Cognitive SW HARQ System

Çiçek, Metin; Akcam, Nursel

doi:10.1007/s11277-020-08059-7

Cited by 1 publication

(1 citation statement)

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“…Overlay means that SU only uses the empty spectrum of PU and has no power limit [18]. It is worth noting that a novel overlay method is proposed in [19], in which SU does not need to sense the spectrum because SU has access opportunities in each transmission cycle, regardless of whether the PU uses the spectrum.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of QoS-Oriented OFDMA Protocol Based on IEEE 802.11ax for Cognitive Radio Network

Yang

Gao

et al. 2023

Applied Sciences

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To improve the quality of service (QoS) on the internet of medical things, a cognitive radio (CR) protocol based on orthogonal frequency division multiple access (OFDMA) is proposed, named CR-OFDMA. In this protocol, we divide a complete channel into multiple orthogonal subchannels and enhance the subchannel assignment scheme, which achieves QoS improvement under consideration of priority and fairness. Furthermore, we improve spectrum resource utilization by fully utilizing the remaining subchannels, feedback slots, and backoff slots. Then, a two-dimensional Markov model is established to describe the dynamic characteristics of the protocol operation, where the backoff stage and the backoff counter value constitute the system state. By establishing the traffic conservation equations for the system operation, the transmission probability and collision probability are calculated, and expressions of system throughput, channel utilization, and fairness index are derived. Finally, numerical results validate the advantages of CR-OFDMA.

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Section: Introductionmentioning

confidence: 99%