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Superposition Modulation Based Symmetric Relaying with Hybrid ARQ: Analysis and Optimization
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.ORCID iD: 0000-0002-7599-4367
2011 (English)In: IEEE Transactions on Vehicular Technology, ISSN 0018-9545, E-ISSN 1939-9359, Vol. 60, no 8, 3667-3683 p.Article in journal (Refereed) Published
Abstract [en]

We present a retransmission scheme based on superposition modulation for the symmetric relaying scenario when the number of retransmissions for a data packet is limited. We consider both diversity combining based as well as code combining based retransmission schemes. Under the assumption that the receiver implements a mechanism that can use all accumulated received mutual information when decoding the message, we derive the packet error probability (PEP) expressions for the proposed retransmission scheme for the case when only one retransmission is allowed. Based on the PEP expressions derived, we provide a closed-form solution for the optimal superposition ratio (the fraction of power used for the relaying operation). Simulation results show that the proposed retransmission scheme offers significant gains compared to a retransmission scheme based on classical decode-and-forward (DF) relaying.

Place, publisher, year, edition, pages
IEEE , 2011. Vol. 60, no 8, 3667-3683 p.
Keyword [en]
Cooperative communications, hybrid ARQ, superposition modulation, outage probability
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-68288DOI: 10.1109/TVT.2011.2162971ISI: 000296021300011OAI: oai:DiVA.org:liu-68288DiVA: diva2:417410
Note
Funding agencies|Swedish Foundation for Strategic Research and the Excellence Center at Linkoping-Lund in Information Technology||Knut and Alice Wallenberg Foundation through a Royal Swedish Academy of Sciences||Available from: 2011-05-17 Created: 2011-05-17 Last updated: 2016-08-31
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.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1494
Keyword
Hybrid-ARQ, relaying schemes, superposition coding, 3GPP- LTE
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-68289 (URN)978-91-7393-144-1 (ISBN)
Presentation
2011-06-17, Visionen, Hus B, Campus Valla, Linköpings universitet, Linköping, 13:15 (English)
Opponent
Supervisors
Available from: 2011-05-27 Created: 2011-05-17 Last updated: 2016-08-31Bibliographically approved

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