Apolinar M Chaidez

US Patent:

20080299922, Dec 4, 2008

Filed:

May 31, 2007

Appl. No.:

11/755816

Inventors:

BILLY J. VAN CANNON - MORTON GROVE IL, US
APOLINAR CHAIDEZ - SOUTH ELGIN IL, US
THEODORE M. LIETZ - SCHAUMBURG IL, US

Assignee:

MOTOROLA, INC. - SCHAUMBURG IL

International Classification:

H01Q 11/12

US Classification:

455126

Abstract:

One provides () both an in-phase signal component () and a quadrature signal component (601) 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.

US Patent:

20210119839, Apr 22, 2021

Filed:

Oct 18, 2019

Appl. No.:

16/657614

Inventors:

- Chicago IL, US
Apolinar Chaidez - South Elgin IL, US
Rodney W. Hagen - Lake In The Hills IL, US
Arthur Christopher Leyh - Spring Grove IL, US

International Classification:

H04L 27/00
H04L 27/20

Abstract:

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.