Diana Mingauw Johnson

US Patent:

6429740, Aug 6, 2002

Filed:

Mar 23, 2000

Appl. No.:

09/533571

Inventors:

Tien M. Nguyen - Fullerton CA
James Yoh - Palos Verdes Peninsula CA
Andrew S. Parker - Redondo Beach CA
Diana M. Johnson - Redondo Beach CA

Assignee:

The Aerospace Corporation - El Segundo CA

International Classification:

H03F 126

US Classification:

330149

Abstract:

A predistortion method uses an extended Saleh model for linearizing the output of nonlinear high power amplifiers having inherent amplitude modulation to amplitude modulation distortion, and inherent amplitude modulation to phase modulation distortion, during conversions of an input signal to an output signal. A complex baseband linearizer provides predistortion at baseband for reducing spectral regrowth and improves bit error performance. The predistortion effects are matched to the amplifier distortions to cancel out the distortions to provide linearized conversions. The extended Saleh model provides a general solution using selected coefficients matched to distortion effects of a particular amplifier.

US Patent:

6680648, Jan 20, 2004

Filed:

Mar 8, 2002

Appl. No.:

10/093681

Inventors:

Tien M. Nguyen - Placentia CA
James Yoh - Palos Verdes Peninsula CA
Charles C. Wang - Alhambra CA
Diana M. Johnson - Redondo Beach CA

Assignee:

The Aerospace Corporation - El Segundo CA

International Classification:

H03F 126

US Classification:

330149, 375297, 455 63

Abstract:

An adaptive predistorter system receives and predistorts an input signal so as to linearize the output signal of a nonlinear high power amplifier amplifying the predistorted input signal using closed-loop feedback of the output signal in complex form at baseband so as to adaptively change the amount of the predistortion of the input signal in the presence of high power amplifier changing characteristics.

US Patent:

8503642, Aug 6, 2013

Filed:

Mar 3, 2008

Appl. No.:

12/073242

Inventors:

Diana Johnson - Las Vegas NV, US

Assignee:

NOS Communications, Inc. - Las Vegas NV

International Classification:

H04M 3/42
H04M 11/00
H04M 15/00

US Classification:

37920101, 379 9312, 37911206, 379133, 37920112

Abstract:

A system and method for managing a telecommunications network and which may let a user monitor and control the user's network telephone services is disclosed. The system may include a CEO Dashboard, a Migration Module, and a Trouble Ticket Wizard. Additionally, the system may include backend processes that periodically run, ensuring that everything is being done to retrieve, and store, the user's available resources on the network. The system may be provided by an integrated platform that is available through online web access and that includes functions such as provisioning, billing, line management, and account management.

US Patent:

63074354, Oct 23, 2001

Filed:

Mar 23, 2000

Appl. No.:

9/534105

Inventors:

Tien M. Nguyen - Fullerton CA
James Yoh - Palos Verdes Peninsula CA
Andrew S. Parker - Redondo Beach CA
Diana M. Johnson - Redondo Beach CA

Assignee:

The Aerospace Corporation - El Segundo CA

International Classification:

H03F 126

US Classification:

330149

Abstract:

A predistortion method use a modified linear-log model for linearizing the output of nonlinear high power amplifiers having inherent amplitude modulation to amplitude modulation distortion, and inherent amplitude modulation to phase modulation distortion, during conversions of an input signal to an output signal. A complex baseband linearizer provides predistortion at baseband for reducing spectral regrowth and improves bit error performance. The predistortion effects are matched to the amplifier distortions to cancel out the distortions to provide linearized conversions. The modified linear-log model is used to reduce the clipping effects through the peak operating point for a specified output power loss with minimum distortion.