Proceedings ArticleDOI
Quantized cooperative spectrum sensing for Cognitive Radio
Warit Prawatmuang,Daniel K. C. So +1 more
- pp 585-589
TLDR
This paper investigates the energy detection based cooperative spectrum sensing technique as it offers low complexity and significantly improves the sensing performance for CR and proposes a low complexity scheme based on an approximation of the cumulative density function.Abstract:
Cognitive Radio (CR) is proposed to maximize spectrum utilization. When the licensed user is not using the spectrum, CR will then use it to communicate among each other. Hence, spectrum sensing, a procedure to observe primary user's existence, is important to CR. In this paper, we investigate the energy detection based cooperative spectrum sensing technique as it offers low complexity and significantly improves the sensing performance for CR. Conventional soft decision combining (SDC) scheme assumes that CR's local observation is perfectly forwarded to the fusion center. This forwarding procedure requires bandwidth, and increasingly so with more sensing nodes. By carefully applying quantization to this local observation, we could significantly reduce the number of bits required for this communication and thus reduce the overall system overhead. Uniform and non-uniform quantization approaches for SDC are investigated. We further propose a low complexity scheme based on an approximation of the cumulative density function. Simulation results show that these schemes can achieve a good detection performance comparable to the conventional SDC scheme, with reduced communication overhead.read more
Citations
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Journal Article
Cooperative Spectrum Sensing in Cognitive Radio Networks
TL;DR: Cooperative spectrum sensing in cognitive radio(CR) networks is analyzed and detection probability to primary users can be improved by multi-cooperative users in multi-user networks.
Journal ArticleDOI
Energy-Efficient Cooperative Spectrum Sensing: A Survey
TL;DR: This work tries to classify the possible directions in energy efficientCSS and presents a limited set of works introducing new ideas to an energy efficient CSS algorithm.
Journal ArticleDOI
HML-Based Smart Positioning of Fusion Center for Cooperative Communication in Cognitive Radio Networks
TL;DR: This letter addresses the problem of the fusion center (FC) positioning based on the novel approach of hierarchical maximum likelihood clustering for cooperative communication by using the proposed scheme, which can be made closer to the dense clusters.
Journal ArticleDOI
A novel approach of power allocation for secondary users in cognitive radio networks
Amrit Mukherjee,Sagarika Choudhury,Pratik Goswami,Gezahegn Abdissa Bayessa,Sumarga Kumar Sah Tyagi +4 more
TL;DR: A simple and robust method based on Euclidean Distance (ED) is implemented which measures the Autocorrelation Error (AE) of the Power spectra of the channel at different instants, which refers to the shortest path between the two active nodes or users.
Proceedings ArticleDOI
A survey on energy detection schemes in cognitive radios
TL;DR: This paper aims at providing an insight into various energy detection schemes for spectrum sensing, primarily owned by Primary Users, which if vacant, can be temporarily utilized by various Secondary Users.
References
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Journal ArticleDOI
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Proceedings ArticleDOI
Cooperative spectrum sensing in cognitive radio networks
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TL;DR: In this paper, the authors illustrate the benefits of cooperation in cognitive radio and show that by allowing the cognitive radios operating in the same band to cooperate, they can reduce the detection time and thus increase their agility.
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