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Simulation of wireless communications in underground tunnels
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
Abstract [en]

The new released 4G standard wireless communication reminds us that higher transmission data rate and more reliable service are required urgently. However, to fulfill the demand can face problems in a complex environment like mines. In this thesis, characterization of underground tunnel mines with the idea of combating intersymbol interference effect is presented.

           Ray tracing simulation method is applied to characterize channel impulse response in different positions of an underground tunnel. From this channel impulse response, we can obtain how intersymbol interference affects different wireless systems. Intersymbol interference occurs due to multipath propagation of time dispersion channel.

          Adaptive Equalization is the most effective way to compensate intersymbol interference. Adaptive filter adapts filter coefficients to compensate the channel so that the combination of the filter and channel offers a flat frequency response and linear phase. The bit error rate performance without using adaptive equalization is compared with using equalizer. Moreover, adaptive equalization approaches using RLS and LMS algorithms are compared with each other. The tradeoff between convergence rate, computation cost instability and ensemble averaged minimum squared errors are analyzed to determine how to select the optimum adaptive equalizer.

Place, publisher, year, edition, pages
2012. , 38 p.
Keyword [en]
time dispersion channels, intersymbol interference, adaptive equalization
National Category
URN: urn:nbn:se:hig:diva-11409Archive number: TEX110226OAI: diva2:488432
Subject / course
Educational program
Electronics/Telecommunications – master’s programme (two years) (swe or eng)
2012-01-26, 11:320, Kungsbäcksvägen 47, 801 76, Gävle, Sweden, 14:00 (English)
Available from: 2012-02-09 Created: 2012-02-01 Last updated: 2012-02-09Bibliographically approved

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