TY - GEN
T1 - Efficient user selection algorithms for wireless broadcast channels
AU - Khan, Arif
AU - Vesilo, Rein
AU - Collings, Iain B.
N1 - Copyright 2007 IEEE. Reprinted from Proceedings of the 2nd international conference on wireless broadband and ultra wideband communications (AusWireless 2007). 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 Macquarie University’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 protected]. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.
PY - 2007
Y1 - 2007
N2 - This paper considers wireless broadcast systems with multi-antenna base stations. Precoding at the transmitter reduces interference between users allowing independent data streams to be sent to multiple users simultaneously. With typically more users than transmit antennas, efficient selection of user subsets is important. The paper compares the effectiveness of several user selection algorithms and identifies situations where they are suboptimal. The impact of zero-forcing (ZF) and dirty paper coding (DPC) precoding are considered. A modification to two current algorithms is proposed that reduces computational time while retaining effectiveness. Simulation is used to assess the modifications and suggest methods of setting parameters. The paper examines the variability of allocated data rates and shows how it affects the performance of weighted alpha rule schedulers, which trade-off efficiency with fairness. It is shown that reducing the variability of allocated rates can have a significant reduction on mean scheduler queue sizes.
AB - This paper considers wireless broadcast systems with multi-antenna base stations. Precoding at the transmitter reduces interference between users allowing independent data streams to be sent to multiple users simultaneously. With typically more users than transmit antennas, efficient selection of user subsets is important. The paper compares the effectiveness of several user selection algorithms and identifies situations where they are suboptimal. The impact of zero-forcing (ZF) and dirty paper coding (DPC) precoding are considered. A modification to two current algorithms is proposed that reduces computational time while retaining effectiveness. Simulation is used to assess the modifications and suggest methods of setting parameters. The paper examines the variability of allocated data rates and shows how it affects the performance of weighted alpha rule schedulers, which trade-off efficiency with fairness. It is shown that reducing the variability of allocated rates can have a significant reduction on mean scheduler queue sizes.
UR - http://www.scopus.com/inward/record.url?scp=47749136676&partnerID=8YFLogxK
U2 - 10.1109/AUSWIRELESS.2007.29
DO - 10.1109/AUSWIRELESS.2007.29
M3 - Conference proceeding contribution
AN - SCOPUS:47749136676
SN - 0769528422
SN - 9780769528427
SP - 1
EP - 6
BT - The 2nd International Conference on Wireless Broadband and Ultra Wideband Communications, AusWireless 2007
PB - Institute of Electrical and Electronics Engineers (IEEE)
CY - Piscataway, NJ
T2 - 2nd International Conference on Wireless Broadband and Ultra Wideband Communications, AusWireless 2007
Y2 - 27 August 2007 through 30 August 2007
ER -