Optimal multi-channel cooperative sensing in cognitive radio networks
Rongfei Fan,Hai Jiang +1 more
TLDR
In this paper, optimal multi-channel cooperative sensing strategies in cognitive radio networks are investigated and a polynomial-complexity algorithm is proposed to solve the problem optimally.Abstract:
In this paper, optimal multi-channel cooperative sensing strategies in cognitive radio networks are investigated. A cognitive radio network with multiple potential channels is considered. Secondary users cooperatively sense the channels and send the sensing results to a coordinator, in which energy detection with a soft decision rule is employed to estimate whether there are primary activities in the channels. An optimization problem is formulated, which maximizes the throughput of secondary users while keeping detection probability for each channel above a pre-defined threshold. In particular, two sensing modes are investigated: slotted-time sensing mode and continuous-time sensing mode. With a slotted-time sensing mode, the sensing time of each secondary user consists of a number of mini-slots, each of which can be used to sense one channel. The initial optimization problem is shown to be a nonconvex mixed-integer problem. A polynomial-complexity algorithm is proposed to solve the problem optimally. With a continuous-time sensing mode, the sensing time of each secondary user for a channel can be any arbitrary continuous value. The initial nonconvex problem is converted into a convex bilevel problem, which can be successfully solved by existing methods. Numerical results are presented to demonstrate the effectiveness of our proposed algorithms.read more
Citations
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Proceedings ArticleDOI
Optimal multi-slot spectrum sensing and transfer in multichannel cognitive radio
TL;DR: An optimization problem is formulated that maximizes the SU's aggregate throughput by jointly allocating the optimal number of sensing time slots and transfer power to each subchannel.
Proceedings ArticleDOI
Cognitive Wireless Network with Cooperative and Selfish Nodes
TL;DR: It is shown in this work that cooperation can be an emergent phenomenon with a considerable costs and Coalitional Games is applied to cognitive wireless networks to show that coalitional attitude both in sensing and transmission data can give a very good gain.
Book ChapterDOI
Analysis of the Classical Spectrum Sensing Algorithm Based on Transmitter
TL;DR: Detailed description of the classical algorithm, and through the simulation to compare the performance of three algorithms, put forward the suitable application scenario, provide some reference for researchers of the algorithm.
Journal ArticleDOI
Optimal non-identical sensing setting for multi channels in cognitive radio networks
Wenjie Zhang,Chai Kiat Yeo +1 more
TL;DR: Simulation results show that the optimal multiple channels cooperative spectrum sensing setting in non-identical environment is highly effective in improving the achievable throughput and delay sensitivity.
Proceedings ArticleDOI
Cooperative spectrum sensing with sensing task allocation in cognitive radio networks
TL;DR: A greedy search algorithm is proposed with which have comparable performance with that of brute-force search and have much less computational complexity, validating the advantage of sensing task allocation.
References
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Book
Convex Optimization
Stephen Boyd,Lieven Vandenberghe +1 more
TL;DR: In this article, the focus is on recognizing convex optimization problems and then finding the most appropriate technique for solving them, and a comprehensive introduction to the subject is given. But the focus of this book is not on the optimization problem itself, but on the problem of finding the appropriate technique to solve it.
Journal ArticleDOI
Cognitive radio: brain-empowered wireless communications
TL;DR: Following the discussion of interference temperature as a new metric for the quantification and management of interference, the paper addresses three fundamental cognitive tasks: radio-scene analysis, channel-state estimation and predictive modeling, and the emergent behavior of cognitive radio.
Journal ArticleDOI
Sensing-Throughput Tradeoff for Cognitive Radio Networks
TL;DR: This paper designs the sensing duration to maximize the achievable throughput for the secondary network under the constraint that the primary users are sufficiently protected, and forms the sensing-throughput tradeoff problem mathematically, and uses energy detection sensing scheme to prove that the formulated problem indeed has one optimal sensing time which yields the highest throughput.
Journal ArticleDOI
Decentralized cognitive MAC for opportunistic spectrum access in ad hoc networks: A POMDP framework
TL;DR: An analytical framework for opportunistic spectrum access based on the theory of partially observable Markov decision process (POMDP) is developed and cognitive MAC protocols that optimize the performance of secondary users while limiting the interference perceived by primary users are proposed.