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Article: An adaptive feedforward amplifier for WCDMA base stations using imperfect signal cancellation. (Technical Feature).
- Article from:
- Microwave Journal
- Article date:
- April 1, 2003
- Author:
CopyrightCOPYRIGHT 2003 Horizon House Publications, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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This article describes a new adaptive feedforward amplifier for a WCDMA system using an imperfect signal cancellation. Due to the complicated signal statistics, the distortion generated by the error amplifier is significantly reduced by an imperfect signal cancellation. Therefore, the performances of feed forward amplifiers are improved with this new adaptation technique, especially for modulated signals with a high peak-to-average ratio. For verification, a 2.14 CHz feedforward amplifier, with 80 W output power has been implemented and tested with digital control circuits. The results, compared to a perfect signal cancellation, show more than 7 dB improvement of adjacent ...