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Low-delay sensing and transmission in wireless sensor networks
KTH, School of Electrical Engineering (EES), Communication Theory.
2008 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

With the increasing popularity and relevance of ad-hoc wireless sensor networks, cooperative transmission is more relevant than ever. In this thesis, we consider methods for optimization of cooperative transmission schemes in wireless sensor networks. We are in particular interested in communication schemes that can be used in applications that are critical to low-delays, such as networked control, and propose suitable candidates of joint source-channel coding schemes. We show that, in many cases, there are significant gains if the parts of the system are jointly optimized for the current source and channel. We especially focus on two means of cooperative transmission, namely distributed source coding and relaying.

In the distributed source coding case, we consider transmission of correlated continuous sources and propose an algorithm for designing simple and energy-efficient sensor nodes. In particular the cases of the binary symmetric channel as well as the additive white Gaussian noise channel are studied. The system works on a sample by sample basis yielding a very low encoding complexity, at an insignificant delay. Due to the source correlation, the resulting quantizers use the same indices for several separated intervals in order to reduce the quantization distortion.

For the case of relaying, we study the transmission of a continuous Gaussian source and the transmission of an uniformly distributed discrete source. In both situations, we propose design algorithms to design low-delay source-channel and relay mappings. We show that there can be significant power savings if the optimized systems are used instead of more traditional systems. By studying the structure of the optimized source-channel and relay mappings, we provide useful insights on how the optimized systems work. Interestingly, the design algorithm generally produces relay mappings with a structure that resembles Wyner-Ziv compression.

Place, publisher, year, edition, pages
2008.
Series
Trita-EE, ISSN 1653-5146 ; 2008:059
Keyword [en]
Cooperative communication, wireless sensor networks, low-delay transmission, joint source-channel coding, estimation, quantization
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-9697OAI: oai:DiVA.org:kth-9697DiVA: diva2:127007
Presentation
2008-12-18, Q26, Osquldas väg 6B, KTH, Stockholm, 13:15 (English)
Opponent
Supervisors
Available from: 2008-11-28 Created: 2008-11-27 Last updated: 2011-11-10
List of papers
1. Distributed Quantization over Noisy Channels
Open this publication in new window or tab >>Distributed Quantization over Noisy Channels
2009 (English)In: IEEE Transactions on Communications, ISSN 0090-6778, E-ISSN 1558-0857, Vol. 57, no 6, 1693-1700 p.Article in journal (Refereed) Published
Abstract [en]

The problem of designing simple and energyefficient sensor nodes in a wireless sensor network is considered from a joint source-channel coding perspective. An algorithm for designing distributed scalar quantizers for orthogonal channels is proposed and evaluated. In particular the cases of the binary symmetric channel as well as the additive white Gaussian noise channel are studied. It is demonstrated that correlation between sources can be useful in order to reduce quantization distortion as well as protecting data when being transmitted over nonideal channels. It is also demonstrated that the obtained system is robust against channel SNR mismatch.

Place, publisher, year, edition, pages
IEEE Communications Society, 2009
Keyword
Source coding, quantization, channel coding, correlation
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-8444 (URN)10.1109/TCOMM.2009.06.070482 (DOI)000266990500026 ()2-s2.0-67650675055 (Scopus ID)
Note
QC 20100908. Uppdaterad från Accepted till Published (20100908)Available from: 2008-11-27 Created: 2008-11-27 Last updated: 2017-12-14Bibliographically approved
2. Optimized low-delay source-channel-relay mappings
Open this publication in new window or tab >>Optimized low-delay source-channel-relay mappings
2010 (English)In: IEEE Transactions on Communications, ISSN 0090-6778, E-ISSN 1558-0857, Vol. 58, no 5, 1397-1404 p.Article in journal (Refereed) Published
Abstract [en]

The three-node relay channel with a Gaussian source is studied for transmission subject to a low-delay constraint. A joint source-channel coding design algorithm is proposed and numerically evaluated. The designed system is compared with reference systems, based on modular source and channel coding, and the distortion-rate function for the Gaussian source using known achievable rates for the relay channel. There is a significant gain, in terms of decreased power, in using the optimized systems compared with the reference systems. The structure of the resulting source encoder and the relay mapping is visualized and discussed in order to gain understanding of fundamental properties of optimized systems. Interestingly, the design algorithm generally produces relay mappings with a structure that resembles Wyner-Ziv compression.

Place, publisher, year, edition, pages
IEEE Press, 2010
Keyword
Estimation, joint source-channel coding, relay channel, quantization, sensor networks
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-9681 (URN)10.1109/TCOMM.2010.05.080595 (DOI)000277771000013 ()2-s2.0-77952564533 (Scopus ID)
Funder
EU, FP7, Seventh Framework Programme, 223866
Note
© 2010 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. QC 20110207Available from: 2011-12-21 Created: 2008-11-27 Last updated: 2017-12-14Bibliographically approved
3. Design and performance of optimized relay mappings
Open this publication in new window or tab >>Design and performance of optimized relay mappings
2010 (English)In: IEEE Transactions on Communications, ISSN 0090-6778, E-ISSN 1558-0857, Vol. 58, no 9, 2718-2724 p.Article in journal (Refereed) Published
Abstract [en]

We look at the three-node relay channel and the transmission of an information symbol from the source node to the destination node. We let the relay be a memoryless function and formulate necessary conditions for the optimality of the relay mapping and the detector. Based on these, we propose a design algorithm to find relay mappings such that the symbol error rate at the destination is minimized. The optimized relay mappings are illustrated for different scenarios and the dependency between the relay mapping and the link qualities is discussed in detail. Furthermore, the performance is compared with existing schemes, such as detect-and-forward, amplify-and-forward, and estimate-and-forward. It is shown that there is a significant gain in terms of decreased symbol error rate if the optimized relay mapping is used.

Keyword
Cooperative transmission, relay channel, relay mapping, modulation, detection, sensor networks.
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-9696 (URN)10.1109/TCOMM.2010.071410.080475 (DOI)000283588700027 ()2-s2.0-77956929922 (Scopus ID)
Note
QC 20110207Available from: 2008-11-27 Created: 2008-11-27 Last updated: 2017-12-14Bibliographically approved

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