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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Journal ArticleDOI
Hybrid Coherent/Energy Detection for Cognitive Radio Networks
TL;DR: A hybrid coherent/energy detection scheme for spectrum sensing which exploits both the pilot and the data symbols transmitted by the primary user and which outperforms both energy detection and coherent detection even if the positions of the pilot symbols are not known a priori.
Proceedings ArticleDOI
Performance of Energy Detection: A Complementary AUC Approach
TL;DR: A new measure, Complementary AUC (CAUC), is introduced as a proxy for the overall detection capability of energy detectors with the help of receiver operating characteristics (ROC) curve and area under the ROC curve (AUC).
Journal ArticleDOI
Optimizing Voting Rule for Cooperative Spectrum Sensing Through Learning Automata
TL;DR: A learning automata-based algorithm is proposed to derive the optimal voting rule for decision fusion in cooperative spectrum sensing and it is shown that the proposed algorithm generally does not need to run many times and can work at a low cost in practice.
Posted Content
Energy-Efficient Delay-Constrained Transmission and Sensing for Cognitive Radio Systems
TL;DR: In this article, the authors proposed a low-complexity rate-adaptation policy that achieves comparable performance as the optimal policy with the low complexity policy, and quantified the impact of energy-overheads (including the power consumption for spectrum sensing and compulsory idling) on SU transmission strategy.
Journal ArticleDOI
Channel Exploration and Exploitation with Imperfect Spectrum Sensing in Cognitive Radio Networks
TL;DR: The problem of opportunistic channel sensing and access in cognitive radio networks when the sensing is imperfect and a secondary user can access up to a limited number of channels at a time is investigated and channel access rules are derived and theoretically proved to have asymptotically finite regret.
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.