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Turbo Equalization for HSPA
Linköping University, Department of Electrical Engineering, Communication Systems.
2010 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesisAlternative title
Turboutjämning för HSPA (Swedish)
Abstract [en]

New high quality mobile telecommunication services are offered everyday and the demand for higher data rates is continuously increasing. To maximize the uplink throughput in HSPA when transmission is propagated through a dispersive channel causing self-interference, equalizers are used. One interesting solution, where the equalizer and decoder exchange information in an iterative way, for improving the equalizer performance is Turbo equalization.

In this thesis a literature survey has been performed on Turbo equalization methods and a chosen method has been implemented for the uplink HSPA standard to evaluate the performance in heavily dispersive channels. The selected algorithm has been adapted for multiple receiving antennas, oversampled processing and HARQ retransmissions. The results derived from the computer based link simulations show that the implemented algorithm provide a gain of approximately 0.5 dB when performing up to 7 Turbo equalization iterations. Gains up to 1 dB have been obtained by disabling power control, not using retransmission combining and utilizing a single receiver antenna. The algorithm has also been evaluated considering alternative dispersive channels, Log-MAP decoding, different code rates, number of Turbo equalization iterations and number of Turbo decoding iterations.

The simulation results do not motivate a real implementation of the chosen algorithm considering the increased computational complexity and small gain achieved in a full featured receiver system. Further studies are needed before concluding the HSPA uplink Turbo equalization approach.

Place, publisher, year, edition, pages
2010. , 94 p.
Keyword [en]
Turbo equalization, MMSE, HSPA, ISI, decoding, equalization, low complexity, HARQ
National Category
Telecommunications Telecommunications
URN: urn:nbn:se:liu:diva-54640ISRN: LiTH-ISY-EX- -10/4301- - SEOAI: diva2:321458
Subject / course
Data Transmission
2010-03-15, Algoritmen, B-huset, Linköpings Universitet, Linköping, 10:00 (English)
Available from: 2010-06-08 Created: 2010-03-29 Last updated: 2012-06-18Bibliographically approved

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