Motorola Corporation

Motorola Solutions, Inc.

Apolinar Chaidez

Gregory J Buchwald

Arthur Christopher Leyh

Rodney Wayne Hagen

Billy J Van Cannon

Theodore M Lietz

A base station device and a method for multi-carrier crest factor reduction are provided. The method includes generating, using a plurality of radio frequency sources, a plurality of radio frequency carrier signals. The method also includes initiating modulation, using a plurality of carrier modulators, of a first subset of the plurality of radio frequency carrier signals with information signals at a first time to generate a plurality of modulated signals and initiating modulation, using the plurality of carrier modulators, of a second subset of the plurality of radio frequency carrier signals with the information signals at a second time to generate the plurality of modulated signals. The second time is a predetermined time offset after the first time. The method also includes transmitting, using one or more antennae, a multi-carrier signal including the plurality of modulated signals.

Multi-carrier crest factor reduction

One provides () both an in-phase signal component () and a quadrature signal component () wherein the latter has a non-zero portion. These two signal components are then combined () to provide a Cartesian training waveform that can be used when training a linear amplifier that uses Cartesian feedback linearization. By one approach, the non-zero portion of the quadrature signal component can be coincident with a zero-crossing portion of the in-phase signal. In many application settings this non-zero portion of the quadrature signal component can be less (and sometimes considerably less) than a peak amplitude of the in-phase signal component. One may also shape the in-phase signal component to have a smoothed envelope. This may include, for example, using a smoothed sine wave such as a raised-sine function.

Method and apparatus for providing a Cartesian training waveform

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South Elgin, IL, United States of America

Apolinar Chaidez