|Title of host publication||IEEE Vehicular Technology Conference (VTC Fall 2008), Calgary|
|Publisher or commissioning body||Institute of Electrical and Electronics Engineers (IEEE)|
|Pages||1 - 5|
|Number of pages||5|
|State||Published - Sep 2008|
|Event||68th Vehicular Technology Conference 2008 (VTC 2008-Fall) - Calgary, Canada|
|Conference||68th Vehicular Technology Conference 2008 (VTC 2008-Fall)|
|Period||1/09/08 → …|
Opportunistic beamforming (OB) relies on the
transmission of Channel State Information (CSI) in the form of instantaneous Signal to Noise Ratio (SNR) from Mobile Stations (MSs) back to the Base Station (BS) for scheduling
purposes that increase throughput and/or maintain resource allocation fairness. OB is employed in environments of low mobility and low scatter, artificially inducing channel
fluctuations that can better exploit Multiuser diversity (MUD). Multiple antennas at the BS are randomly alter the channel’s response and generate peaks in gain where users can be scheduled on, maximising system throughput. Additional gains are achieved by transmitting multiple weighting vectors from the BS, but their use can significantly increase the load of the feedback channel and
mitigate MUD gains. Selective Multiuser diversity (SMUD) has been proposed for the original beamforming scheme as a technique that reduces feedback requirements substantially without any significant throughput degradations. This paper considers the joined use of multiple weights and SMUD in opportunistic beamforming, aiming to increase capacity while reducing feedback overhead. Results show that with
an appropriate use of threshold levels, not only average throughput can be increased through the use of multiple weighting vectors but also a notable decrease in feedback load requirements compared to the conventional OB with SMUD design is achieved.
The terms Mobile Station (MS) and User are used interchangeably in this paper, with the same meaning
Rose publication type: Conference contribution
Additional information: With accompanying conference presentation
Sponsorship: The authors wish to acknowledge the financial support of Toshiba Research Europe Limited (TREL) and EPSRC and to thank Dr. Yong Sun of TREL for his technical input
This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Bristol's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to email@example.com.
By choosing to view this document, you agree to all provisions of the copyright laws protecting it.
68th Vehicular Technology Conference 2008 (VTC 2008-Fall)
|Duration||1 Sep 2008 → …|