Opportunistic spectrum access in unslotted primary systems

We consider the design of opportunistic spectrum access (OSA) strategies that allow secondary users to search for and exploit spectrum opportunities in unslotted primary systems. The traffic of the primary system in each channel is modeled by a continuous time Markov process. We formulate the joint...

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Bibliographic Details
Published in:Journal of the Franklin Institute 2012-04, Vol.349 (3), p.985-1010
Main Authors: Tehrani, Pouya, Liu, Keqin, Zhao, Qing
Format: Article
Language:English
Subjects:
Applied sciences
Channels
Decision theory. Utility theory
Design engineering
Exact sciences and technology
False alarms
Markov processes
Mathematical models
Mathematics
Operational research and scientific management
Operational research. Management science
Probability and statistics
Probability theory and stochastic processes
Radiocommunications
Sciences and techniques of general use
Searching
Separation
Strategy
Telecommunications
Telecommunications and information theory
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Summary:We consider the design of opportunistic spectrum access (OSA) strategies that allow secondary users to search for and exploit spectrum opportunities in unslotted primary systems. The traffic of the primary system in each channel is modeled by a continuous time Markov process. We formulate the joint design of OSA as a constrained discrete-time partially observable Markov decision process (POMDP). A separation principle for the joint design of OSA is established under certain conditions on the probability of false alarm of the spectrum sensor. This result extends the separation principle for OSA in slotted primary systems to unslotted primary systems. Furthermore, we show that the myopic sensing policy has a simple and robust structure under certain conditions on the probability of false alarm.
ISSN:0016-0032
1879-2693
DOI:10.1016/j.jfranklin.2011.12.003