A pruning scheduler for multi-user clustered OFDM systems

Author

Wilson, Sarah Kate ; Svedman, Patrick ; Cimini, Leonard J., Jr.

Author_Institution

KTH Signals, Sensors & Syst., R. Inst. of Technol., Stockholm, Sweden

Volume

2

fYear

2004

fDate

26-29 Sept. 2004

Firstpage

1048

Abstract

Multi-user diversity is meant to work in a cell with several active users, relying on the increased probability that at least one of the users will have a high SNR. When using clustered OFDM with multi-user diversity, the system can admit too many users, defeating the multi-user effect. We present a scheduling scheme that overcomes this disadvantage by using a simple on-off waterfilling. We analyze the performance of the system when the feedback is not reliable and the average SNR is very low (0 dB). Our proposed scheduling algorithm increases the number of successful users by a factor of three over a coded system with one user per OFDM symbol.

Keywords

OFDM modulation; cellular radio; diversity reception; frequency division multiple access; multiuser channels; time division multiple access; FD-TDMA system; OFDM downlink system; cellular system; high SNR user; multiuser clustered OFDM systems; multiuser diversity; on-off waterfilling scheduling scheme; pruning scheduler; unreliable channel state feedback; Downlink; Fading; Feedback; Feeds; OFDM; Performance analysis; Processor scheduling; Scheduling algorithm; Sensor systems; Throughput;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th

ISSN

1090-3038

Print_ISBN

0-7803-8521-7

Type

conf

DOI

10.1109/VETECF.2004.1400181

Filename

1400181