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Impulse Response Shortening for OFDM in a Single Frequency Network
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
1998 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Orthogonal Frequency Division Multiplexing (OFDM) is considered and effctive technique in high speed digital transmission under frequency selective multipath fading. With the insertion of a guard time of a sufficient duration it becomes possible to cope with the severe articifial self interference in a spectral efficient Single Frequency Network (SFN). No intersymbol interference is caused in channels whose impulse response is shorter than the guard time. One solution to restore the degradation due to this interference is to employ additional equalization.

In this thesis different time-domain equalization approachs attempting to cancel echos exceeding the guard time are studied. New equalizations structures which are adapted to the special channel conditions in a SFN are proposed. The symbol error probability for systems with those equalizers is comprared to conventional receiver performance and is shown that the proposed equalizer structures are suitable to reduce the error probability at the receiver. Furthermore the equalization effects on the coverage properties of a SFN are also addressed in this thesis.

Place, publisher, year, edition, pages
1998. , 57 p.
TRITA-S3-RST, ISSN 1400-9137
National Category
Computer and Information Science
URN: urn:nbn:se:kth:diva-28147OAI: diva2:384014
Available from: 2011-03-11 Created: 2011-01-07 Last updated: 2014-10-15Bibliographically approved

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