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Using cooperative transmission in wireless multihop networks
KTH, School of Electrical Engineering (EES), Communication Networks. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
KTH, School of Electrical Engineering (EES), Communication Networks. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.ORCID iD: 0000-0002-2764-8099
KTH, School of Electrical Engineering (EES), Communication Theory. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.ORCID iD: 0000-0002-7926-5081
2009 (English)In: IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, 2009, Vol. PIMRCConference paper (Refereed)
Abstract [en]

This paper investigates the efficiency of cooperative transmission when it is applied in wireless multihop networks. We consider regular linear networks and derive the achievable rate-delay tradeoff when selective relaying through a single relay node is used in each hop. We show that relaying achieves significant gain particularly in the high throughput - high delay regime.

Place, publisher, year, edition, pages
2009. Vol. PIMRC
Keyword [en]
Achievable rate, Cooperative transmission, High throughput, Relay node, Wireless multi-hop network, Radio communication, Wireless local area networks (WLAN), Linear networks
National Category
Computer and Information Science
URN: urn:nbn:se:kth:diva-30323DOI: 10.1109/PIMRC.2009.5449776ISI: 000305824602185ScopusID: 2-s2.0-77952842771ISBN: 9781424451234OAI: diva2:400064
2009 IEEE 20th Personal, Indoor and Mobile Radio Communications Symposium, PIMRC 2009

QC 20110224

Available from: 2011-02-24 Created: 2011-02-23 Last updated: 2013-05-17Bibliographically approved
In thesis
1. Cooperative and Cognitive Communication in Wireless Networks
Open this publication in new window or tab >>Cooperative and Cognitive Communication in Wireless Networks
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In the last decade, significant efforts and progress have been made by both the industry and academia to meet the rapidly growing demand for wireless applications and services. To achieve more flexible, dynamic and intelligent use of the limited wireless spectrum, cooperative transmission and cognitive networking are proposed as two of the key technologies for the next generation wireless communication systems, such as Long-Term Evolution Advanced. Cooperative transmission techniques, such as cooperative relaying and Multiple-Input and Multiple-Output (MIMO) can increase spectrum efficiency by utilizing the diversity of wireless channels, while cognitive transmitters tune their transmission parameters according to the environment to optimize network level performance. In this thesis, we provide performance modeling and analysis of different cooperative and cognitive communication techniques to exploit their potential.

In the first part of the thesis, we investigate the performance of hop-by-hop cooperative communication on a multihop transmission path applying spatial reuse time division multiplexing, where interference from simultaneous transmissions exists. Based on the models, we compare the performance of hop-by-hop cooperation with the performance of traditional simple multihopping schemes, and give the regimes where hop-by-hop cooperation achieves significant gain. Considering random networks, we propose cooperative geographic routing, the integration of hop-by-hop cooperation with traditional geographic routing, and evaluate the effects of the topology knowledge range and the network density.

In the second part of the thesis, we discuss how cooperative transmission techniques can be utilized in cognitive and hierarchical spectrum sharing networks, where the primary users have transmission guarantees, and the coexisting secondary users need to be cognitive and adjust their transmissions in the shared spectrum bands to conform constraints from the primary users. We consider large-scale coexisting primary and secondary networks, where concurrent primary and secondary transmissions are allowed, and the secondary users provide cooperative relaying for the primary ones and control the interference at the primary receivers by tuning the probability of transmitting and by forming a primary exclusive region around each primary receiver within which all secondary users have to be silent. We define a unified analytic framework to model the performance of cooperative spectrum sharing and cognitive transmission control, characterize their achievable gains, and show that both of the networks have strong incentives to participate in the collaboration.

Finally, we investigate spectrum sharing networks where both primary and secondary users have stochastic packet arrival. Under the constraint that the performance of primary users does not degrade, we find the dilemma for the secondary users. That is, if a secondary user chooses to cooperate, it can transmit immediately even if the primary queue is not empty, but has additional costs for relaying primary packets, such as increased power consumption. We propose a dynamic cooperation scheme for the secondary user so that it can make sequential decision on whether to cooperate or not in each time slot based on the state of the network. We show that optimal sequential decision is necessary to efficiently trade off the cooperation cost and the packet delay of the secondary user.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. vii, 54 p.
TRITA-EE, ISSN 1653-5146 ; 2013:18
National Category
urn:nbn:se:kth:diva-122277 (URN)978-91-7501-731-0 (ISBN)
Public defence
2013-06-05, Q2, Osquldas väg 10, KTH, Stockholm, 10:00 (English)

QC 20130517

Available from: 2013-05-17 Created: 2013-05-16 Last updated: 2014-02-11Bibliographically approved

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