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Improved Error Protection for Uplink Control Signaling in 3GPP-LTE via Complex-Field Coding
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, The Institute of Technology.
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, The Institute of Technology.
Ericsson Research.
2010 (English)In: Proceedings of the IEEE Vehicular Technology Conference (VTC), 2010Conference paper (Refereed)
Abstract [en]

We study the uplink control signaling in 3GPP-Long Term Evolution (LTE) systems. Specifically, we propose a precoding method that uses complex-field coding (CFC) to improve the performance of the PUCCH format 2 control signaling. In the case of perfect channel state information (CSI) at the receiver and with a single receive antenna, the proposed method offers significant gains compared to the coding currently used in 3GPP-LTE. However the gains are marginal with two receive antennas. In order to examine the impact of channel estimation errors, we also derive the optimal detector for the case of imperfect receiver CSI, both for conventional coding and for the proposed CFC method.

Place, publisher, year, edition, pages
, IEEE Vehicular Technology Conference, ISSN 1550-2252
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-53651DOI: 10.1109/VETECS.2010.5493842ISBN: 978-1-4244-2518-1OAI: diva2:290524
IEEE 71st Vehicular Technology Conference, May 16-19, Taipei, Taiwan
©2010 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEEAvailable from: 2010-05-27 Created: 2010-01-27 Last updated: 2011-05-27Bibliographically approved
In thesis
1. Improved Techniques for Retransmission and Relaying in Wireless Systems
Open this publication in new window or tab >>Improved Techniques for Retransmission and Relaying in Wireless Systems
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The last three decades have seen significant advances in the wireless communication field. As the data rates of wireless systems are increasing, the demand for mobile services also is increasing rapidly. Like other natural resources, radio spectrum suitable for mobile wireless communications is also limited. In order to keep up with this ever increasing demand, there is a requirement of new signal processing algorithms.

Diversity is a technique used in wireless systems to combat the effects of fading and thereby improve reliability of data transfer. There are many ways in which algorithms can exploit diversity in wireless channels. Hybrid-automatic repeat request (H-ARQ) schemes and relaying mechanisms are two such diversity extracting techniques. Even though these diversity achieving techniques have been well understood in theory, there are many ways in which one can optimize these techniques for specific application scenarios.In this thesis, we focus on improving the performance of retransmission schemes and relaying systems.

In the first part of the thesis, we improve the performance of H-ARQ schemes in the 3GPP- long term evolution (LTE) system by improving the performance of feedback signaling. We employ complex-field coding to extract the inherent frequency diversity available in the resources. Next, we provide a sub-optimal solution to the outage-optimal power allocation problem in incremental redundancy based H-ARQ system, whose performance is practically the same as that of the optimal solution.

In the later part of the thesis, we propose a retransmission scheme based on superposition coding (SPC) for the symmetric relaying scenario. We provide packet error probability (PEP) expressions and solutions for the optimal fraction of power allocated for the partners' data. Finally, we study the optimal bits-to-symbol mappings for SPC and its effect on an H-ARQ scheme and the symmetric relaying scenario using SPC.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2011. 19 p.
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1494
Hybrid-ARQ, relaying schemes, superposition coding, 3GPP- LTE
National Category
Engineering and Technology
urn:nbn:se:liu:diva-68289 (URN)978-91-7393-144-1 (ISBN)
2011-06-17, Visionen, Hus B, Campus Valla, Linköpings universitet, Linköping, 13:15 (English)
Available from: 2011-05-27 Created: 2011-05-17 Last updated: 2011-05-27Bibliographically approved

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