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Dynamic spectrum access using the interference temperature model

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Abstract

To combat spectral overcrowding, the FCC investigated new ways to manage RF resources. The idea was to let people use licensed frequencies, provided they can guarantee interference perceived by the primary license holders will be minimal. With advances in software and cognitive radio, practical ways of doing this are on the horizon. In 2003, the FCC released a memorandum seeking comment on the interference temperature model for controlling spectrum use. Analyzing the viability of this model and developing a medium access protocol around it are the main goals of this article. A model consisting of interference sources, primary licensed users, and secondary unlicensed users is modeled stochastically. If impact on licensed users is defined by a fractional decrease in coverage area, and this is held constant, the capacity achieved by secondary users is directly proportional to the number of unlicensed nodes, and is independent of the interference and primary users’ transmissions. Using the basic ideas developed in the system analysis, interference temperature multiple access, a physical and data-link layer implementing the interference temperature model, was formulated, analyzed, and simulated. A system implementing this model will measure the current interference temperature before each transmission. It can then determine what bandwidth and power it should use to achieve a desired capacity without violating an interference ceiling called the interference temperature limit. Ultimately, the resulting performance from the interference temperature model is low, compared to the amount of interference it can cause to primary users. Partly due to this research, in May 2007, the FCC rescinded its notice of proposed rule-making implementing the interference temperature model.

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Notes

  1. For simplicity, we do not examine partially overlapping signals. The analysis could be extended to account for this, but the notation becomes particularly awkward. Capacity would then become a continuous function of B.

  2. For the purposes of this section, we assume a path loss constant of 2, indicating simple free-space path loss. Typically, this value is larger, between 3 and 4, due to the effects of multipath fading. However, using any value other than 2 makes the integrals symbolically uncomputable. These model assumptions must be taken into account when evaluating the results of the analysis based on these models.

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Authors and Affiliations

  1. Electrical and Computer Engineering, University of Maryland, College Park, MD, USA

    T. Charles Clancy

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  1. T. Charles Clancy
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Correspondence to T. Charles Clancy.

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Portions of this work, specifically content from Section 2, have been previously published as [1, 2].

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Clancy, T.C. Dynamic spectrum access using the interference temperature model. Ann. Telecommun. 64, 573–592 (2009). https://doi.org/10.1007/s12243-009-0098-x

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  • DOI: https://doi.org/10.1007/s12243-009-0098-x

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