Wireless Communications: Principles and Practice
Wireless Communications: Principles and Practice
Exploiting medium access diversity in rate adaptive wireless LANs
Proceedings of the 10th annual international conference on Mobile computing and networking
Fundamentals of wireless communication
Fundamentals of wireless communication
Optimizing transmission rate in wireless channels using adaptive probes
SIGMETRICS '06/Performance '06 Proceedings of the joint international conference on Measurement and modeling of computer systems
Optimal channel probing and transmission scheduling for opportunistic spectrum access
Proceedings of the 13th annual ACM international conference on Mobile computing and networking
Distributed opportunistic scheduling for ad-hoc communications: an optimal stopping approach
Proceedings of the 8th ACM international symposium on Mobile ad hoc networking and computing
Opportunistic spectral usage: bounds and a multi-band CSMA/CA protocol
IEEE/ACM Transactions on Networking (TON)
Distributed spectrum sensing and access in cognitive radio networks with energy constraint
IEEE Transactions on Signal Processing
Optimal selection of channel sensing order in cognitive radio
IEEE Transactions on Wireless Communications
IEEE Transactions on Information Theory
Optimality of myopic sensing in multichannel opportunistic access
IEEE Transactions on Information Theory
Optimal Transmission Strategies for Dynamic Spectrum Access in Cognitive Radio Networks
IEEE Transactions on Mobile Computing
Extended Knowledge-Based Reasoning Approach to Spectrum Sensing for Cognitive Radio
IEEE Transactions on Mobile Computing
Distributed opportunistic scheduling for ad-hoc communications under delay constraints
INFOCOM'10 Proceedings of the 29th conference on Information communications
Sequential and cooperative sensing for multi-channel cognitive radios
IEEE Transactions on Signal Processing
Distributed learning in multi-armed bandit with multiple players
IEEE Transactions on Signal Processing
Cognitive Medium Access: Exploration, Exploitation, and Competition
IEEE Transactions on Mobile Computing
IEEE Transactions on Information Theory
Sensing-Throughput Tradeoff for Cognitive Radio Networks
IEEE Transactions on Wireless Communications
Optimal spectrum sensing framework for cognitive radio networks
IEEE Transactions on Wireless Communications
On myopic sensing for multi-channel opportunistic access: structure, optimality, and performance
IEEE Transactions on Wireless Communications - Part 2
Distributed opportunistic scheduling for ad hoc communications with imperfect channel information
IEEE Transactions on Wireless Communications - Part 2
IEEE Transactions on Information Theory
Decentralized cognitive MAC for opportunistic spectrum access in ad hoc networks: A POMDP framework
IEEE Journal on Selected Areas in Communications
HC-MAC: A Hardware-Constrained Cognitive MAC for Efficient Spectrum Management
IEEE Journal on Selected Areas in Communications
Simple Channel Sensing Order in Cognitive Radio Networks
IEEE Journal on Selected Areas in Communications
Cooperative Sensing With Imperfect Reporting Channels: Hard Decisions or Soft Decisions?
IEEE Transactions on Signal Processing
Wireless Personal Communications: An International Journal
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In this paper, we exploit channel diversity for opportunistic spectrum access (OSA). Our approach uses instantaneous channel quality as a second criterion (along with the idle/busy status of the channel) in selecting channels to use for opportunistic transmission. The difficulty of the problem comes from the fact that it is practically infeasible for a cognitive radio (CR) to first scan all channels and then pick the best among them, due to the potentially large number of channels open to OSA and the limited power/hardware capability of a CR. As a result, the CR can only sense and probe channels sequentially. To avoid collisions with other CRs, after sensing and probing a channel, the CR needs to make a decision on whether to terminate the scan and use the underlying channel or to skip it and scan the next one. The optimal use-or-skip decision strategy that maximizes the CR's average throughput is one of our primary concerns in this study. This problem is further complicated by practical considerations, such as sensing/probing overhead and sensing errors. An optimal decision strategy that addresses all the above considerations is derived by formulating the sequential sensing/probing process as a rate-of-return problem, which we solve using optimal stopping theory. We further explore the special structure of this strategy to conduct a ''second-round'' optimization over the operational parameters, such as the sensing and probing times. The aggregate throughput performance when a network of CRs coexist with primary radios is evaluated under homogeneous and heterogeneous spectrum environments, respectively. We show through simulations that significant throughput gains (e.g., about 100%) are achieved using our joint sensing/probing scheme over the conventional one that uses sensing alone.