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Title: Cooperative diversity in wireless networks : frameworks and analysis
Author: Jardine, Allan
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2007
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In spatial diversity, independently fading signals can be received by antenna elements separated by a small distance. Combining of the received signals can lead to an increase in the capacity and reliability of communications over the wireless channel. Spatial diversity can be achieved in a cellular network by sharing information between Mobile Terminals (MTs) where one MT acts as a relay supporting the data transmitted from the source in the first instance by forwarding information to the destination in the second instance. Due to the cooperation between MTs this is termed cooperative diversity. Initially this thesis considers the effect of cooperative diversity in an environment where MTs are equipped with two antenna elements, effectively combining the fast-fading combating techniques of cooperative diversity and multiple-antennas. Cooperative diversity transmission can be performed by a number of different protocols, which are termed Protocols I-V. Imposing system constraints on the network in order to make a fair comparison between the protocols, in-particular the traditional single-hop channel, allows the benefits of cooperative diversity to fully be established. An information theory approach is developed using multiple antenna techniques to provide a framework for cooperative diversity. It is shown that cooperative diversity can offer significant improvements in terms of probability of outage and capacity. In-particular, an adaptive cooperative diversity protocol is developed to select the optimal protocol dependent on channel conditions which shows a 4.25dB increase in capacity, at the 5% outage level, for a single user.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available