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Signal Canceller in the Carrier Super-positioning Satellite Networks

Lars Berlemann1, Stefan Mangold2, Guido R. Hiertz3, and Bernhard H. Walke3
1. Lars Berlemann
2. Swisscom Innovations, Berne, Switzerland
3. RWTH Aachen University, Faculty 6, Germany

Abstract— Spectrum regulation will undergo elementarychanges in the near future allowing a less restricted andmore flexible access to radio spectrum. Intelligent radios, socalledcognitive radios, will realize the dynamic usage offrequency bands on an opportunistic basis, by identifyingand using under-utilized spectrum. Such a flexible spectrumusage requires changes in regulation towards a more openspectrum. Policies which determine when spectrum isconsidered as opportunity and which define the possibilitiesof using these spectrum opportunities are needed. First, thisarticle discusses an approach that intends to enabledistributed QoS support in open spectrum. This algorithm isspecified as policy in a machine-understandable policydescription language, such that the cognitive radio iscapable of reasoning about spectrum usage. Policies thatenable a software defined medium access are the secondfocus of this article. We discuss a step towards therealization of such cognitive radios at the example of thewell-known Enhanced Distributed Channel Access of IEEE802.11e. This channel access protocol is here specified in amachine understandable policy language, instead of lengthytextual description. Such a machine-understandabledescription of the protocol enables cognitive radios tooperate in distributed environments according to the802.11(e) standard.

Index Terms— Cognitive Radio Networks, EDCA, IEEE802.11e, Policy Description Language, Spectrum Navigation

Cite: Lars Berlemann, Stefan Mangold, Guido R. Hiertz, and Bernhard H. Walke, "Signal Canceller in the Carrier Super-positioning Satellite Networks," Journal of Communications, vol. 1, no. 1, pp. 1-12, 2006.