Performance of Relaying Protocols

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Riihonen, Taneli
dc.contributor.author Le, Viet-Anh
dc.date.accessioned 2012-03-06T13:38:01Z
dc.date.available 2012-03-06T13:38:01Z
dc.date.issued 2009
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/3067
dc.description.abstract In wireless systems, cooperative diversity and relaying can exploit the benefit of spatial diversity and combat heavy pathloss without requiring multiple antennas at the receivers and transmitters. For practical networks, the use of relays is motivated by the need for simple, inexpensive terminals with limited power and a single antenna. The motivation for this thesis is to study and propose practical relaying protocols that can reduce the power consumption and ameliorate the performance with minimum additional complexity. Based on a dual-hop communication model, we exploit two upper bounds for the end-to-end SNR. These bounds further inspire us to propose new relaying protocols for wireless communication systems. We examine the case of a single user and relay under Rayleigh and Nakagami-m fading conditions. Based on the general upper bound, a new protocol is introduced: Clipped gain. This protocol makes it possible to save the transmit power by stopping the transmission when the quality of the first hop leads to an outage. We consider also user selection and user scheduling for dual-hop communication with multiple users and relays over a Rayleigh fading channel. We introduce new scheduling protocols based on one-bit feedback information. To the best of our knowledge, most of the available literature uses full channel state information to perform user selection and user scheduling. Interestingly, our protocols based on one bit feedback greatly improve the system performance while adding less additional complexity. To carry out rigorous comparison, close-form expressions are derived and analytical results used to assess the outage probability performance. en
dc.format.extent 125
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Helsinki University of Technology en
dc.publisher Teknillinen korkeakoulu fi
dc.title Performance of Relaying Protocols en
dc.type G2 Pro gradu, diplomityö fi
dc.contributor.school Elektroniikan, tietoliikenteen ja automaation tiedekunta fi
dc.subject.keyword cooperative diversity en
dc.subject.keyword multiple antennas en
dc.subject.keyword relay en
dc.subject.keyword dual-hop en
dc.subject.keyword relaying protocols en
dc.subject.keyword user selection en
dc.subject.keyword user scheduling en
dc.subject.keyword feedback en
dc.identifier.urn URN:NBN:fi:aalto-201203071298
dc.type.dcmitype text en
dc.programme.major Signaalinkäsittelytekniikka fi
dc.programme.mcode S-88
dc.type.ontasot Diplomityö fi
dc.type.ontasot Master's thesis en
dc.contributor.supervisor Wichman, Risto
dc.programme Elektroniikan ja sähkötekniikan tutkinto-ohjelma fi
dc.location P1 fi


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