Multi-User Channel Estimation in OFDMA Uplink Systems Based on Irregular Sampling and Reduced Pilot Overhead

Author

Fertl, Peter ; Matz, Gerald

Author_Institution

Inst. of Commun. & Radio-Frequency Eng., Vienna Univ. of Technol., Austria

Volume

3

fYear

2007

fDate

15-20 April 2007

Abstract

This paper considers multiuser OFDMA uplink transmissions over doubly selective channels. We propose a pilot-aided channel estimator based on irregular sampling techniques. Our novel estimator features several benefits: it has low complexity, excellent performance, and enables highly flexible subcarrier allocation. Simulation results show that our scheme significantly outperforms conventional least-squares channel estimation and allows to support high-rate users with reduced pilot overhead.

Keywords

channel estimation; frequency division multiple access; multiuser channels; radio links; sampling methods; OFDMA uplink systems; irregular sampling; multi-user channel estimation; reduced pilot overhead; subcarrier allocation; Channel estimation; Frequency estimation; Interference; Radio frequency; Radio spectrum management; Resource management; Sampling methods; Scattering; Tiles; WiMAX; OFDMA; channel estimation; irregular sampling; multiuser channels; uplink;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech and Signal Processing, 2007. ICASSP 2007. IEEE International Conference on

Conference_Location

Honolulu, HI

ISSN

1520-6149

Print_ISBN

1-4244-0727-3

Type

conf

DOI

10.1109/ICASSP.2007.366531

Filename

4217705