Motion estimator for a CDMA mobile station

US6373882B1 · kind B1 · utility

Assignee

• Telefonaktiebolaget LM Ericsson (Publ) · SE

Inventors

• Roozbeh Atarius · San Diego, US
• Torsten Carlsson · Lund, SE
• Håkan Eriksson · Täby, SE
• Kjell Gustafsson · Lund, SE
• Torgny Palenius · Barsebäck, SE
• Christer Östberg · Staffanstorp, SE

Key dates

• Filing date: Nov 6, 1998
• Grant date: Apr 16, 2002
• Expiry date: Nov 6, 2018

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B2201/70707
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

The present invention provides a system and method for reducing the power consumed by a RAKE receiver. In exemplary embodiments of the present invention, an environment variation estimator is implemented in a CDMA mobile station. The environment variation estimator is connected to the searcher of the RAKE receiver and provides an estimate of the rate at which the mobile station's environment is changing. By providing an estimate of the rate of change of the mobile station's environment, the duty cycle of the searcher can be optimized, thereby reducing the overall power consumed by the receiver. By also providing the estimate to the RAKE fingers, channel tracking can be improved.