Open Access

Chip-Level Channel Equalization in WCDMA Downlink

  • Kari Hooli1Email author,
  • Markku Juntti1,
  • Markku J. Heikkilä2,
  • Petri Komulainen2,
  • Matti Latva-aho1 and
  • Jorma Lilleberg2
EURASIP Journal on Advances in Signal Processing20022002:180318

Received: 14 August 2001

Published: 12 August 2002


The most important third generation (3G) cellular communications standard is based on wideband CDMA (WCDMA). Receivers based on TDMA style channel equalization at the chip level have been proposed for a WCDMA downlink employing long spreading sequences to ensure adequate performance even with a high number of active users. These receivers equalize the channel prior to despreading, thus restoring the orthogonality of users and resulting in multiple-access interference (MAI) suppression. In this paper, an overview of chip-level channel equalizers is delivered with special attention to adaptation methods suitable for the WCDMA downlink. Numerical examples on the equalizers′ performance are given in Rayleigh fading frequency-selective channels.


WCDMAmultiple-access interferencechannel equalization

Authors’ Affiliations

Centre for Wireless Communications, University of Oulu, Finland
Nokia Mobile Phones, Oulu, Finland


© Hooli et al. 2002