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
|Translated title of the contribution||Reducing feedback requirements of the multiple weight opportunistic beamforming scheme via selective multiuser diversity|
|Title of host publication||IEEE Vehicular Technology Conference (VTC Fall 2008), Calgary|
|Publisher||Institute of Electrical and Electronics Engineers (IEEE)|
|Pages||1 - 5|
|Number of pages||5|
|Publication status||Published - Sep 2008|
|Event||68th Vehicular Technology Conference 2008 (VTC 2008-Fall) - Calgary, Canada|
Duration: 1 Sep 2008 → …
|Conference||68th Vehicular Technology Conference 2008 (VTC 2008-Fall)|
|Period||1/09/08 → …|
Bibliographical noteRose 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
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