Link adaption with limited feedback for future wireless networks

Patachaianand, R

Link adaption with limited feedback for future wireless networks

Patachaianand, R

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Publication Type:: Thesis
Issue Date:: 2012

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Field	Value	Language
dc.contributor.author	Patachaianand, R
dc.date.accessioned	2015-06-10T02:56:57Z
dc.date.available	2015-06-10T02:56:57Z
dc.date.issued	2012
dc.identifier.uri	http://hdl.handle.net/10453/36055
dc.description	University of Technology, Sydney. Faculty of Engineering and Information Technology.	en_US
dc.description.abstract	Link adaptation technique (LAT) is one of the radio resource management (RRM) functions necessary for future wireless network to enhance the system capacity and provide an adequate quality of service to the end users. LAT requires knowledge of users’ received signal-to-noise ratio so that scheduling and adaptive modulation and coding scheme (MCS) can be performed to optimise the system performance. The received SNR is measured by the mobile users in the downlink transmission and converted to channel state information (CSI), which is sent via feedback channel in the uplink direction to the base station. The amount of feedback required for adaptive MCS and scheduling at the BS increases with the number of users which consumes significant amount of system resources. It is critical to provide an efficient feedback algorithm for LAT to achieve high utilisation of the system resources while maintaining the system performance close to the system with perfect knowledge of CSI. This thesis attempted to answer the following questions related to LAT with reduced CSI feedback load: a) Based on our current knowledge of feedback reduction techniques, can the feedback load be further reduced without scarifying the system performance? b) Do multiple threshold schemes perform better than single threshold schemes? c) How is it possible to develop a feedback technique(s) that can self-adjust the parameters associated with CSI reporting to suit the system conditions? d) Provided that a well-known scheduling technique creates significant delays in the scheduling process, is it possible to mitigate the delays without any need for additional feedback resources? e) Based on our current knowledge of CSI transmission on the uplink, can a more efficient media access control scheme for CSI reporting be developed?	en_US
dc.format	Thesis (PhD)	en_US
dc.language.iso	en	en_US
dc.relation	https://opus.lib.uts.edu.au/bitstream/10453/36055/7/02whole.pdf
dc.rights	The author owns the copyright in this thesis including all reproduction and reuse rights for the work. The work may not be altered without the permission of the copyright owner. Attribution is essential when quoting or paraphrasing from this thesis.
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	au.edu.uts.lib/ppc
dc.rights	© 2012 Rachod Patachaianand
dc.title	Link adaption with limited feedback for future wireless networks	en_US
dc.type	Thesis
utslib.copyright.status	open_access

Abstract:

Link adaptation technique (LAT) is one of the radio resource management (RRM) functions necessary for future wireless network to enhance the system capacity and provide an adequate quality of service to the end users. LAT requires knowledge of users’ received signal-to-noise ratio so that scheduling and adaptive modulation and coding scheme (MCS) can be performed to optimise the system performance. The received SNR is measured by the mobile users in the downlink transmission and converted to channel state information (CSI), which is sent via feedback channel in the uplink direction to the base station. The amount of feedback required for adaptive MCS and scheduling at the BS increases with the number of users which consumes significant amount of system resources. It is critical to provide an efficient feedback algorithm for LAT to achieve high utilisation of the system resources while maintaining the system performance close to the system with perfect knowledge of CSI. This thesis attempted to answer the following questions related to LAT with reduced CSI feedback load: a) Based on our current knowledge of feedback reduction techniques, can the feedback load be further reduced without scarifying the system performance? b) Do multiple threshold schemes perform better than single threshold schemes? c) How is it possible to develop a feedback technique(s) that can self-adjust the parameters associated with CSI reporting to suit the system conditions? d) Provided that a well-known scheduling technique creates significant delays in the scheduling process, is it possible to mitigate the delays without any need for additional feedback resources? e) Based on our current knowledge of CSI transmission on the uplink, can a more efficient media access control scheme for CSI reporting be developed?

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