Low-complexity channel estimation for WCDMA random access

Author

Weber, Ralf

Author_Institution

Ericsson Eurolab Deutschland GmbH, Nuremberg, Germany

Volume

1

fYear

2000

fDate

2000

Firstpage

344

Abstract

This paper investigates various low-complexity channel estimation techniques applied to the random access channel of wideband CDMA (WCDMA) specified by 3GPP for IMT-2000/UMTS. Good access performance is important for efficient packet data transmission. Different schemes using slot-based or symbol-based pilot-assisted channel weights are considered. Several interpolation methods and post-filters are compared. A unified frequency domain post-filtering for interference and noise suppression is employed. Link level simulation results for typical indoor and vehicular fading channels are presented and compared with performance of ideal (undistorted) channel weights. Performance criterion is the frame error rate (FER) vs. average signal-to-noise-ratio E_b/N₀. It turns out that symbol-based channel estimation can lead to significant improvements of 1-1O dB compared to conventional slot-based approaches without post-filter; especially for high speed scenarios (>200 km/h). A good choice for all scenarios is a non-causal forward-backward-multiplication-method (FBMM) filter employing modified polar interpolation

Keywords

broadband networks; cellular radio; code division multiple access; data communication; digital filters; error statistics; estimation theory; fading channels; frequency-domain analysis; indoor radio; interference suppression; interpolation; packet radio networks; radio access networks; radiofrequency interference; 200 km/h; IMT-2000; UMTS; WCDMA random access; access performance; average signal-to-noise-ratio; frame error rate; high speed; indoor fading channels; interference suppression; interpolation methods; link level simulation resul; low-complexity channel estimation; modified polar interpolation; noise suppression; noncausal forward-backward-multiplication-method filter; packet data transmission; post-filters; slot-based pilot-assisted channel weights; symbol-based channel estimation; symbol-based pilot-assisted channel weights; unified frequency domain post-filtering; vehicular fading channels; wideband CDMA; 3G mobile communication; Channel estimation; Data communication; Error analysis; Fading; Frequency domain analysis; Interference suppression; Interpolation; Multiaccess communication; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2000. IEEE-VTS Fall VTC 2000. 52nd

Conference_Location

Boston, MA

ISSN

1090-3038

Print_ISBN

0-7803-6507-0

Type

conf

DOI

10.1109/VETECF.2000.886675

Filename

886675