Opportunistic Downlink Sum-Rate with Multiple Feedback Thresholds

Sandrasegaran, K; Patachaianand, R; Madani, FM

Opportunistic Downlink Sum-Rate with Multiple Feedback Thresholds

Sandrasegaran, K

Patachaianand, R Madani, FM

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Publisher:: IEEE
Publication Type:: Conference Proceeding
Citation:: The 2010 International Conference on Computer Applications & Industrial Electronics (ICCAIE 2010), 2010, pp. 441 - 444
Issue Date:: 2010-01

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Field	Value	Language
dc.contributor.author	Sandrasegaran, K https://orcid.org/0000-0003-1270-5756	en_US
dc.contributor.author	Patachaianand, R	en_US
dc.contributor.author	Madani, FM	en_US
dc.contributor.editor	Habibah Hashim	en_US
dc.date	2010-12-05	en_US
dc.date.issued	2010-01	en_US
dc.identifier.citation	The 2010 International Conference on Computer Applications & Industrial Electronics (ICCAIE 2010), 2010, pp. 441 - 444	en_US
dc.identifier.isbn	978-1-4244-9053-0	en_US
dc.identifier.uri	http://hdl.handle.net/10453/16403
dc.description.abstract	The achievable sum-rate capacity in multiuser systems grows as an increasing function of the number of users when opportunistic scheduling is employed. The scheduling requires the knowledge of channel state information (CSI) which is generated and sent from the users. It has been verified that the sum-rate capacity of a multiuser system with one-bit CSI feedback scheme by which each user whose channel quality is above an optimally selected threshold sends one-bit feedback has the same growth rate as that with the full CSI. However, the one-bit feedback scheme introduces non-negligible capacity loss to the achievable sum-rate. In this paper, a feedback reduction technique with multiple feedback thresholds is presented and analysed. The analysis yields closed-form expressions of the achievable sum-rate and its lower bound. The numerical results show that approximately 84% of the capacity loss can be eliminated in the system employing three optimally selected feedback thresholds. The lower-bound of the achievable sum-rate approaches the full-CSI sum-rate as the number of thresholds increases.	en_US
dc.publisher	IEEE	en_US
dc.relation.ispartof	The 2010 International Conference on Computer Applications & Industrial Electronics (ICCAIE 2010)	en_US
dc.relation.ispartof	International Conference on Computer Applications & Industrial Electronics	en_US
dc.rights	© 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.	en_US
dc.title	Opportunistic Downlink Sum-Rate with Multiple Feedback Thresholds	en_US
dc.type	Conference Proceeding
utslib.location	Kuala Lumpur, Malaysia	en_US
utslib.location.activity	Kuala Lumpur, Malaysia	en_US
utslib.for	0906 Electrical and Electronic Engineering	en_US
dc.location.activity	Kuala Lumpur, Malaysia	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Electrical and Data Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CRIN - Realtime Information Networks
utslib.copyright.status	open_access
pubs.consider-herdc	true	en_US
pubs.place-of-publication	Kuala Lumpur, Malaysia	en_US
pubs.start-date	2010-12-05	en_US

Abstract:

The achievable sum-rate capacity in multiuser systems grows as an increasing function of the number of users when opportunistic scheduling is employed. The scheduling requires the knowledge of channel state information (CSI) which is generated and sent from the users. It has been verified that the sum-rate capacity of a multiuser system with one-bit CSI feedback scheme by which each user whose channel quality is above an optimally selected threshold sends one-bit feedback has the same growth rate as that with the full CSI. However, the one-bit feedback scheme introduces non-negligible capacity loss to the achievable sum-rate. In this paper, a feedback reduction technique with multiple feedback thresholds is presented and analysed. The analysis yields closed-form expressions of the achievable sum-rate and its lower bound. The numerical results show that approximately 84% of the capacity loss can be eliminated in the system employing three optimally selected feedback thresholds. The lower-bound of the achievable sum-rate approaches the full-CSI sum-rate as the number of thresholds increases.

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http://hdl.handle.net/10453/16403