Skip to main content Accessibility help
×
Home
Hostname: page-component-99c86f546-n7x5d Total loading time: 0.262 Render date: 2021-12-09T14:45:01.393Z Has data issue: true Feature Flags: { "shouldUseShareProductTool": true, "shouldUseHypothesis": true, "isUnsiloEnabled": true, "metricsAbstractViews": false, "figures": true, "newCiteModal": false, "newCitedByModal": true, "newEcommerce": true, "newUsageEvents": true }

6 - Multiuser scheduling

Published online by Cambridge University Press:  07 October 2011

Hong-Chuan Yang
Affiliation:
University of Victoria, Canada
Mohamed-Slim Alouini
Affiliation:
King Abdullah University of Science and Technology, Saudi Arabia
Get access

Summary

Introduction

Multiple antenna techniques can provide significant diversity benefit to wireless systems. In certain practical scenarios, however, it might be challenging to implement multiple antennas at the wireless terminals. In such a case, we can still extract the diversity bene?t by exploring the different fading channels corresponding to multiple users. Since users are separately located, different user channel will most likely experience independent fading [1, 2]. At any given time instant, it is highly probable that at least one user channel will have a favorable channel condition. The overall system performance will improve if the channel access is always granted to the users with the best instantaneous channel quality, usually the one with the highest SNR, resulting in the so-called multiuser diversity gain.

Both multiple antenna diversity and multiuser diversity try to improve the performance of wireless systems over fading channels. Their approaches, how-ever, are conceptually different. Antenna diversity targets at eliminating deep SNR fades by combining multiple diversity paths together, whereas multiuser diversity rides the SNR peaks of different users channels. As such, multiuser diversity exploits multipath fading rather than reducing it. In certain cases, fading might need to be intentionally introduced with some random beamforming approach [3]. Multiuser diversity enjoys several inherent advantages, including simpler receiver structures, as a single antenna per receiver is suffcient, and naturally independent fading channels, as users are usually geographically separated. On the other hand, multiuser diversity may require additional system resources to collect user channel state information, especially for non-reciprocal channels.

Type
Chapter
Information
Order Statistics in Wireless Communications
Diversity, Adaptation, and Scheduling in MIMO and OFDM Systems
, pp. 162 - 192
Publisher: Cambridge University Press
Print publication year: 2011

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Send book to Kindle

To send this book to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle.

Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

  • Multiuser scheduling
  • Hong-Chuan Yang, University of Victoria, Canada, Mohamed-Slim Alouini, King Abdullah University of Science and Technology, Saudi Arabia
  • Book: Order Statistics in Wireless Communications
  • Online publication: 07 October 2011
  • Chapter DOI: https://doi.org/10.1017/CBO9781139043328.008
Available formats
×

Send book to Dropbox

To send content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about sending content to Dropbox.

  • Multiuser scheduling
  • Hong-Chuan Yang, University of Victoria, Canada, Mohamed-Slim Alouini, King Abdullah University of Science and Technology, Saudi Arabia
  • Book: Order Statistics in Wireless Communications
  • Online publication: 07 October 2011
  • Chapter DOI: https://doi.org/10.1017/CBO9781139043328.008
Available formats
×

Send book to Google Drive

To send content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about sending content to Google Drive.

  • Multiuser scheduling
  • Hong-Chuan Yang, University of Victoria, Canada, Mohamed-Slim Alouini, King Abdullah University of Science and Technology, Saudi Arabia
  • Book: Order Statistics in Wireless Communications
  • Online publication: 07 October 2011
  • Chapter DOI: https://doi.org/10.1017/CBO9781139043328.008
Available formats
×