Interference Modeling for Next Generation Wireless Networks

  • In a wireless communication environment characterized by dynamic channels, high influence of interference, bandwidth shortage and strong demand for quality of service (QoS) support, the challenge for achieving maximal spectral efficiency and high data rate is unprecedented. The data rate achievable now with most practical systems is in the range of tens of megabits per second. As discussed by Shannon, the channel capacity limit is not dependent on the transmitter/ receiver technologies but on the properties of the communication channel. The SIR in the presence of multipath fading, shadowing and path loss is a very important parameter for studying the capacity of a wireless system. This thesis presents a statistical analysis of the SIR for next generation wireless networks. First a new analytical formula for the PDF of the signal to interference ratio for a single interferer is presented. Monte Carlo simulation is used to validate the analytical formula. However in a realistic environment there are often more than one active interferers in a given cell. Two distinct approaches are used to study the effect of multiple interferers on the statistics of the SIR. The sum of random vector approach is used to find the PDF of the SIR for the multiple interference scenario. Laguerre polynomial approximations are used to simplify the problem of finding the PDF of the SIR. A new algorithm is proposed to find the optimum free parameter for the Laguerre approximation. However even with the optimum free parameter, the computational burden required to approximate the PDF of the SIR for multiple interferers with a Laguerre polynomial was impractical. Therefore an alternative characteristics function approach was proposed in this thesis. In this approach the path loss, shadowing and multipath fading are assumed to be dependent random variables. The statistical analysis of the SIR is used to study the TDD inter-cell interference in a self-organizing user deployed femtocell systems.

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Publishing Institution:IRC-Library, Information Resource Center der Jacobs University Bremen
Granting Institution:Jacobs Univ.
Author:Abdurazak Mudesir
Referee:Harald Haas, Mathias Bode, Kit Wong
Advisor:Harald Haas
Persistent Identifier (URN):urn:nbn:de:101:1-2013052410977
Document Type:PhD Thesis
Date of Successful Oral Defense:2010/11/05
Date of First Publication:2010/12/27
PhD Degree:Electrical Engineering
School:SES School of Engineering and Science
Other Countries Involved:United Kingdom
Library of Congress Classification:T Technology / TK Electrical engineering. Electronics. Nuclear engineering / TK5101-6720 Telecommunication. Including telegraphy, telephone, radio, radar, television [and positioning technology] / TK5101-5105.8887 Telecommunication / TK5103.2-5103.4885 Wireless communication systems. Mobile communication systems
Call No:Thesis 2010/34

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