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Opportunistic multichannel access with decentralized channel state information
KTH, Skolan för elektro- och systemteknik (EES), Reglerteknik.
Vise andre og tillknytning
2015 (engelsk)Inngår i: Wireless Communications & Mobile Computing, ISSN 1530-8669, E-ISSN 1530-8677, Vol. 15, nr 2, s. 322-339Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

This paper considers multiaccess control for the uplink in orthogonal frequency division multiple access wireless networks. To avoid the extensive information exchange associated with centralized approaches, we formulate the decentralized access control problem with the contention power constraint as a Bayesian game, mapping time-varying channel state information into contention strategies. By exploiting the problem structure, a strategy where users access the channels with probability one if the observed channel gain is above a predetermined threshold is shown to be optimal. It is also shown that the energy consumption of the threshold strategy will not exceed that of randomized strategies. The game is then equivalently reformulated as one of finding the threshold value in a distributed manner, and the existence and uniqueness of Bayesian Nash equilibria is established. A distributed algorithm based on Lagrange duality is proposed to approach the unique equilibrium, and the algorithm is shown to be globally stable. In a homogeneous system, the performance loss of the proposed scheme is proved to be bounded compared with a centralized channel allocation scheme. Contrary to other proposals, our method allows for heterogeneous channel state information and achieves a comparable throughput with reduced power.

sted, utgiver, år, opplag, sider
2015. Vol. 15, nr 2, s. 322-339
Emneord [en]
distributed multiaccess control, channel state information, fading channel, game theory
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-159966DOI: 10.1002/wcm.2348ISI: 000347719500009Scopus ID: 2-s2.0-84921858279OAI: oai:DiVA.org:kth-159966DiVA, id: diva2:793163
Merknad

QC 20150306

Tilgjengelig fra: 2015-03-06 Laget: 2015-02-12 Sist oppdatert: 2018-01-11bibliografisk kontrollert

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