Cooperative HARQ protocols using semi-blind relays for underlay cognitive radio networks

Touati, Sami; Boujemâa, Hatem; Hussain, Musaed A. Al; Alturki, Fahd A.; Abed, Nazha

doi:10.1007/s11235-015-0120-8

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…Specifically, in [93]- [95], it is assumed that the CUs infer the activity of the PUs via observing their feedbacks flags. Touati et al [96] have performed the seminal performance analysis of ARQ-aided and relay-assisted CR systems. Yue et al [97], [98] have proposed an improved HARQ scheme for the family of CR systems by The family of ARQ techniques was studied in satellite communications [33].…”

Section: A Related Workmentioning

confidence: 99%

Delay and Throughput Analysis of Cognitive Go-Back-N HARQ in the Face of Imperfect Sensing

2017

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Abstract-In order to mitigate spectrum scarcity, the cognitive radio (CR) paradigm has been invoked for improving the overall exploitation of the licensed spectrum by identifying and filling the free spectrum holes without degrading the transmission of primary users (PUs). Hence, we conceive a CR communication scheme, which enables a cognitive user (CU) to sense the activity of the PUs over a primary radio (PR) channel, which is exploited to transmit data using the modified Go-Back-N hybrid automatic repeat request (GBN-HARQ) protocol, when PR channel is free from the PUs. This arrangement is termed as the cognitive GBN-HARQ (CGBN-HARQ), where the activity of PUs on the PR channel is modelled as a two-state Markov chain having 'ON' and 'OFF' states. However, the CU may wrongly detect the 'ON'/'OFF' activity of the PUs in the channel, hence resulting in false-alarm or misdetection. Therefore, the two-state Markov chain is extended to four states by explicitly considering all the wrong sensing decisions. In this paper, we analytically modelled the CGBN-HARQ scheme with the aid of a Discrete Time Markov Chain (DTMC). Explicitly, an algorithm is developed for deriving all the legitimate states and for eliminating the illegitimate states, which assists us in reducing both the dimensionality of the state transition matrix and the associated computational complexity. Furthermore, based on DTMC modelling, we derive closed-form expressions for evaluating the throughput, the average packet delay and the end-to-end packet delay of CGBN-HARQ in realistic imperfect sensing environment. The results are also validated by our simulations. Our performance results demonstrate that both the achievable throughput andThe authors are with the

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Section: A Related Workmentioning

confidence: 99%

Delay and Throughput Analysis of Cognitive Go-Back-N HARQ in the Face of Imperfect Sensing

2017

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“…In order to deploy NOMA in a range of wireless systems, it is needed to combine with cooperative communications. In recent years, there are a lot of researches about cooperative communications to improve diversity capacity, and hence to increase the coverage and rate of wireless networks [7][8][9][10]. In the first timeslot, the sources broadcast their data to the relays while in the second timeslot, the relays assist the sources to transfer the received signals to the destinations by solutions as amplify-and-forward (AF) and decode-and-forward (DF) relaying techniques [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Exact Outage Probability of Two-Way Decode-and-Forward NOMA Scheme with Opportunistic Relay Selection

Huynh¹,

Vozňák²

2019

KSII TIIS

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In this paper, we propose a two-way relaying scheme using non-orthogonal multiple access (NOMA) technology. In this scheme, two sources transmit packets with each other under the assistance of the decode-and-forward (DF) relays, called as a TWDFNOMA protocol. The cooperative relays exploit successive interference cancellation (SIC) technique to decode sequentially the data packets from received summation signals, and then use the digital network coding (DNC) technique to encrypt received data from two sources. A max-min criterion of end-to-end signal-to-interference-plus-noise ratios (SINRs) is used to select a best relay in the proposed TWDFNOMA protocol. Outage probabilities are analyzed to achieve exact closed-form expressions and then, the system performance of the proposed TWDFNOMA protocol is evaluated by these probabilities. Simulation and analysis results discover that the system performance of the proposed TWDFNOMA protocol is improved when compared with a conventional three-timeslot two-way relaying scheme using DNC (denoted as a TWDNC protocol), a four-timeslot two-way relaying scheme without using DNC (denoted as a TWNDNC protocol) and a two-timeslot two-way relaying scheme with amplify-and-forward operations (denoted as a TWANC protocol). Particularly, the proposed TWDFNOMA protocol achieves best performances at two optimal locations of the best relay whereas the midpoint one is the optimal location of the TWDNC and TWNDNC protocols. Finally, the probability analyses are justified by executing Monte Carlo simulations.

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Opportunistic spectrum access for cooperative unlicensed femtocells in two-tier heterogeneous networks utilizing HARQ feedback

Karar

Barman

2017

Computer Networks

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Cooperative HARQ protocols using semi-blind relays for underlay cognitive radio networks

Cited by 3 publications

References 24 publications

Delay and Throughput Analysis of Cognitive Go-Back-N HARQ in the Face of Imperfect Sensing

Delay and Throughput Analysis of Cognitive Go-Back-N HARQ in the Face of Imperfect Sensing

Exact Outage Probability of Two-Way Decode-and-Forward NOMA Scheme with Opportunistic Relay Selection

Opportunistic spectrum access for cooperative unlicensed femtocells in two-tier heterogeneous networks utilizing HARQ feedback

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