Multi-Carrier WCDMA Basestation Design Considerations - Amplifier Linearization and Crest Factor Control

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Abstract
This paper presents issues to be considered when designing multi-carrier WCDMA basestations. Two topics will be the main focus of this discussion; the power amplifier linearization and the peak-to-average power reduction of a multi-carrier WCDMA signal, both of which are important for efficient operation of wideband power amplifiers and cost-effective design of the overall base station. WCDMA signal characterization, technology selection, linearization, and peak reduction methods are discussed.

About PMC
PMC-Sierra™ is a leading provider of high speed broadband communications and storage semiconductors and MIPS-Powered™ processors for Enterprise, Access, Metro Optical Transport, Storage Area Networking and Wireless network equipment. The company offers worldwide technical and sales support, including a network of offices throughout North America, Europe and Asia. The company is publicly traded on the NASDAQ Stock Market under the PMCS symbol and is included in the S&P 500 Index.

About the Authors
Andrew Wright is Director of Wireless and Signal Processing Product Research at PMC-Sierra. Dr Wright is a former co-founder and CTO of Datum Telegraphic Inc. and holds a Ph.D. in Microwave Engineering (meteorology). Since 1995, he has specialized in signal processing solutions for third generation wireless systems.
Oliver Nesper is a DSP Design Engineer in the Access Product Division. He has worked on the development of the PALADIN (Predistortion) and PALADIN Waveshaper products. Prior to that he was with Spectrum Signal Processing as a hardware development engineer working on the design of Soft Radio Receiver Platforms.

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