Spectrum utilization efficiency in CRNs with hybrid spectrum access and channel reservation: A comprehensive analysis under prioritized traffic

2021 ◽  
Author(s):  
Abd Ullah Khan ◽  
Ghulam Abbas ◽  
Ziaul Haq Abbas ◽  
Wali Ullah Khan ◽  
Muhammad Waqas
Keyword(s):  
Comprehensive Analysis ◽  
Utilization Efficiency ◽  
Spectrum Access ◽  
Spectrum Utilization ◽  
Channel Reservation

Development of mathematical model for multi-user coded-cooperation based cognitive radio system and its outage probability analysis

2021 ◽  
Author(s):  
Garima Singh ◽  
Gurjit Kaur
Keyword(s):  
Mathematical Model ◽  
Cognitive Radio ◽  
Outage Probability ◽  
Utilization Efficiency ◽  
Spectrum Efficiency ◽  
Spectrum Utilization ◽  
Radio System ◽  
Cognitive Radio System ◽  
Temperature Constraint ◽  
Coded Cooperation

Abstract In this paper, single and multi-user coded-cooperation based cognitive radio system is developed by designing its mathematical model where both source and relay will communicate to a single destination with the help of each other. Then all possible multi-user scenarios are developed and their end-to-end outage probability (Pout) is calculated for underlay mode of cognitive radio. The performance of the system is analyzed in the form of channel gain and interference temperature constraint for Rayleigh fading channel. The proposed system concludes that the coded cooperation with cognitive radio outperform the available techniques in the form of bandwidth, diversity, spectrum utilization efficiency and also improves the quality of communication. Furthermore, the theoretical analysis of the outage probability for both system models is validated by asymptotic analysis. The proposed system can set as a standard for all those cognitive radio applications which requires better spectrum efficiency even if there is a scarcity of multiple physical antennas.

scholarly journals Modeling of cognitive radio system for the improvement of spectrum utilization

2018 ◽  
Vol 7 (3.3) ◽  
pp. 231
Author(s):  
Meena M ◽  
Monish M ◽  
Sharanya C ◽  
Dr V Rajendran
Keyword(s):  
Dynamic Spectrum Access ◽  
Chain Process ◽  
Continuous Time Markov Chain ◽  
Spectrum Access ◽  
Mac Layer ◽  
Spectrum Utilization ◽  
Radio System ◽  
Network Applications ◽  
Proposed Model ◽  
Layer Technique

It’s well inferred that the MAC layer technique on wireless network is well established and many scientists elaborately worked on this technique till the updated 5G technology. However, the present study clearly says on spectrum-based parameters are becoming very popular and cognitive defined systems are found to be near best solution for many communication network applications. Hence this paper provides to develop an algorithm and policy engine makes a details model and study on dynamic spectrum access in cognitive system using continuous time Markov chain process. The detailed and outcome of results clearly shows a 96% of efficiency on the spectrum dynamics which came from our unique proposed model.  

scholarly journals Analysis of Cognitive Radio Spectrum Access with Optimal Channel Reservation

2007 ◽  
Vol 11 (4) ◽  
pp. 304-306 ◽  
Author(s):  
Xiaorong Zhu ◽  
Lianfeng Shen ◽  
Tak-shing Yum
Keyword(s):  
Cognitive Radio ◽  
Radio Spectrum ◽  
Spectrum Access ◽  
Channel Reservation

scholarly journals Cancel-Decode-Encode Processing on Two-Way Cooperative NOMA Schemes in Realistic Conditions

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Thu-Thuy Thi Dao ◽  
Pham Ngoc Son
Keyword(s):  
Interference Cancellation ◽  
Imperfect Information ◽  
Signal To Noise Ratio ◽  
Utilization Efficiency ◽  
System Throughput ◽  
Spectrum Utilization ◽  
Digital Network ◽  
Asymptotic Expressions ◽  
Outage Probabilities ◽  
Multiple Relay

This paper considers the effects of perfect/imperfect successive interference cancellation (SIC) and perfect/imperfect ` information (CSI) in a multiple-relay two-way cooperative network using nonorthogonal multiple access (NOMA) and digital network coding (DNC). In this model, a relay is selected by maximizing estimated channel gains to enhance the decoding capacity of the nearer source and minimize the collection time of imperfect CSI. Spectrum utilization efficiency is enhanced two times by a mixture of the SIC and DNC techniques at the selected relay (called as the SIC-2TS protocol). The system performance is considered through analysis of the exact and asymptotic expressions of the system outage probabilities and throughput. The major thing is exposed as the proposed SIC-2TS protocol can reach the best performance at optimal positions of the selected relay. Besides, the system throughput of the proposed protocol outperforms a SIC-utilized two-way relaying scheme without the DNC (called as the SIC-3TS protocol) and a conventional two-way scheme (called as the CONV-4TS protocol) for all signal-to-noise ratio regions. Lastly, the validity of the analytical expressions is verified by the Monte Carlo simulation results.

scholarly journals Modeling Study on Dynamic Spectrum Sharing System Under Interference Temperature Constraints in Underground Coal Mines

2015 ◽  
Vol 8 (1) ◽  
pp. 140-148
Author(s):  
Chen Guizhen ◽  
Ding Enjie ◽  
Wang Gang ◽  
Xue Xue
Keyword(s):  
Spectrum Sharing ◽  
Dynamic Spectrum Access ◽  
Coal Mines ◽  
Dynamic Spectrum ◽  
Utilization Efficiency ◽  
Spectrum Access ◽  
Secondary Users ◽  
Dynamic Spectrum Sharing ◽  
Interference Temperature ◽  
Access System

This paper proposes a dynamic spectrum access system for underground wireless communication——a dynamic spectrum sharing system under interference temperature constrains. It can make the best of spectrum resources and improve the utilization efficiency. Then, a multi-dimensional Markov chain is used to model the system. On the basis, the secondary users’ performance under interference temperature constrains is obtained. As two important performance indexes to measure secondary users’ performance, cognitive users’ interrupting probability and blocking probability are calculated. Finally, cognitive users’ performance under different users’ access is analyzed, and the performances in dynamic spectrum access system and overlay access system are compared. Simulation results indicate that the dynamic spectrum sharing access system under interference temperature constrains is superior to the overlay access system and helpful to improve the spectrum sharing system in coal mines.

scholarly journals Analysis of Efficient Spectrum Handoff in a Multi-Class Hybrid Spectrum Access Cognitive Radio Network Using Markov Modelling

Sensors ◽  
2019 ◽  
Vol 19 (19) ◽  
pp. 4120 ◽  
Author(s):  
Atif Shakeel ◽  
Riaz Hussain ◽  
Adeel Iqbal ◽  
Irfan Latif Khan ◽  
Qadeer ul Hasan ◽  
...  
Keyword(s):  
Cognitive Radio ◽  
Substantial Improvement ◽  
System Throughput ◽  
Spectrum Access ◽  
Spectrum Utilization ◽  
Markov Modelling ◽  
Spectrum Handoff ◽  
Delay Sensitive ◽  
Primary Network ◽  
The Impact

Cognitive radio networks (CRNs) rely on sensing of the licensed spectrum of a primary network to dynamically ascertain underutilized portion of the spectrum, thus affording additional communication opportunities. In a CRN, a single homogeneous spectrum access, such as interweave only deprives the secondary users (SUs) of channel access during handoff, particularly at high primary network traffic. Therefore, providing quality-of-service (QoS) to multi-class SUs with diverse delay requirements during handoff becomes a challenging task. In this paper, we have evolved a Markov-based analytical model to ascertain the gain in non-switching spectrum handoff scheme for multi-class SUs employing hybrid interweave-underlay spectrum access strategy. To satisfy the QoS requirements of the delay-sensitive traffic, we have analyzed the impact of hybrid spectrum access scheme for prioritized multi-class SUs traffic. The results show substantial improvement in spectrum utilization, average system throughput and extended data delivery time compared to conventional CRN using interweave only spectrum access. This demonstrates the suitability of the proposed scheme towards meeting QoS requirements of the delay-sensitive SU traffic while improving the overall performance for delay-tolerant SU traffic as well.

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