Uplink cell capacity of cognitive radio networks with peak interference power constraints

Xuemin Hong, Cheng Xiang Wang, John Thompson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

A cognitive radio (secondary) network can reuse the under-utilized spectrum licensed to a primary network on a non-interruptive basis. In this paper, we study the uplink capacity of a secondary network where a secondary base station (BS) is located at the center while multiple secondary users are uniformly distributed within a circular cell of radius R. Primary users are assumed to be distributed in the same plane according to a Poisson point process with a density parameter ?p. To protect primary services, secondary users can only transmit under a peak interference power constraint which guarantees that the instantaneous interference power perceived by any primary user is not larger than a certain threshold. In addition, we assume an opportunistic scheduler at the BS which exploits multi-user diversity among M secondary users and stochastically maximize the cell capacity. We first study the capacity with a simple channel model considering only the path loss and derive the closed-form cumulative distribution function (CDF) of the capacity. We then study the capacity with realistic fading channel models using a semi-analytical approach. The impacts of the parameters R, ?p, and M on the capacity are quantified and discussed. Moreover, we find that shadowing and fading only have limited impacts on the distribution of the capacity. ©2008 IEEE.

Original languageEnglish
Title of host publication2008 International Conference on Communications, Circuits and Systems Proceedings, ICCCAS 2008
Pages372-377
Number of pages6
DOIs
Publication statusPublished - 2008
Event2008 International Conference on Communications, Circuits and Systems - Xiamen, Fujian Province, China
Duration: 25 May 200827 May 2008

Conference

Conference2008 International Conference on Communications, Circuits and Systems
Abbreviated titleICCCAS 2008
Country/TerritoryChina
CityXiamen, Fujian Province
Period25/05/0827/05/08

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