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Joint channel synchronization under interference limited conditions
SES ASTRA, Chateau de Betzdorf, Betzdorf, L-6815 Luxembourg.
KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre. KTH, School of Electrical Engineering (EES), Signal Processing.ORCID iD: 0000-0003-2298-6774
SES ASTRA, Chateau de Betzdorf, Betzdorf, L-6815 Luxembourg.
2007 (English)In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 6, no 10, 3781-3789 p.Article in journal (Refereed) Published
Abstract [en]

Spectral efficiency is of great concern in the return channel of satellite based broadband systems. In [1] the feasibility of increased efficiency by reducing channel spacing below the Symbol Rate was demonstrated using joint detection and decoding for a synchronized system. We extend this work by addressing the critical synchronization problem in the presence of adjacent channel interference (ACI) which limits performance as carrier spacing is reduced. A pilot sequence aided joint synchronization scheme for a multi-frequency time division multiple access (MF-TDMA) system is proposed. Based on a maximum likelihood (ML) criterion, the channel parameters, including frequency, time and phase are jointly estimated for the channel of interest and the adjacent channels. The impact of ACI on the synchronization and detection performance is investigated. It is shown that joint channel parameter estimation outperforms single carrier synchronization with reasonable additional computational complexity in the receiver. Based on the proposed synchronization scheme in conjunction with an appropriate joint detection mechanism, see [1], carrier spacing can be reduced significantly compared to current systems providing a substantial increase in spectral efficiency.

Place, publisher, year, edition, pages
IEEE , 2007. Vol. 6, no 10, 3781-3789 p.
Keyword [en]
data-aided synchronization, interference, multi-frequency time division multiple access (MF-TDMA), multi-user synchronization, frequency estimation, cancellation, performance, signals
National Category
Telecommunications Communication Systems
Identifiers
URN: urn:nbn:se:kth:diva-17038DOI: 10.1109/twc.2007.060099ISI: 000250177700037Scopus ID: 2-s2.0-35448956443OAI: oai:DiVA.org:kth-17038DiVA: diva2:335081
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2012-05-31Bibliographically approved

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Ottersten, Björn

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