Joint Design and Separation Principle for Opportunistic Spectrum Access in the Presence of Sensing Errors

By Yunxia Chen, Qing Zhao, Ananthram Swami. IEEE Transactions on Information Theory, 2007

437 citations recorded by the source corpus.

Opportunistic spectrum access (OSA) that allows secondary users to independently search for and exploit instantaneous spectrum availability is considered. The design objective is to maximize the throughput of a secondary user while limiting the probability of colliding with primary users. Integrated in the joint design are three basic components: a spectrum sensor that identifies spectrum opportunities, a sensing strategy that determines which channels in the spectrum to sense, and an access strategy that decides whether to access based on potentially erroneous sensing outcomes. This joint design is formulated as a constrained partially observable Markov decision process (POMDP), and a separation principle is established. The separation principle reveals the optimality of myopic policies for the design of the spectrum sensor and the access strategy, leading to closed-form optimal solutions. Furthermore, it decouples the design of the sensing strategy from that of the spectrum sensor and the access strategy, and reduces the constrained POMDP to an unconstrained one. Numerical examples are provided to study the tradeoff between sensing time and transmission time, the interaction between the physical layer spectrum sensor and the MAC layer sensing and access strategies, and the robustness of the ensuing design to model mismatch.

Subfields: Computer Networks and Communications, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/ea0e3ed5d33d50c2d92c1bcca4af2ebbb8aae0d4

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Citations in the corpus

Opportunistic Scheduling with Reliability Guarantees in Cognitive Radio Networks (2008, background): “Similar models have been considered in [ 11 ], [12].”
Advances in cognitive radio networks: A survey (2011, background): “A separation principle [107] reveals the optimality of myopic policies for the spectrum sensor design and access strategy, and reduces the complexity of the POMDP formulation by decoupling the design of sensing strategy from the design of the access strategy.”
Indexability of Restless Bandit Problems and Optimality of Whittle Index for Dynamic Multichannel Access (2008, background): “Related Work Multichannel opportunistic access in the context of cognit ive radio systems has been studied in [17], [18] where the problem is formulated as a Partially O bservable Markov Decision Process (POMDP) to take into account potential correlations among c hannels.”
Cognitive radio networking and communications: an overview (2011, background): “[95], the authors show that a separation principle exists, which”
A Survey of Dynamic Spectrum Access (2007, positive): “For the OSA network example, a separation principle based on a POMDP framework has been established in [23] and [24] that leads to a closed-form characterization of the optimal access strategy jointly designed with the sensing strategy for any operating point δ ∈ (0, 1) of the spectrum detector.”