Patent Number: 7,535,292

Title: Optimized uplink efficiencies for transmission of satellite data

Abstract: Systems and methods for characterizing amplifiers. A system for characterizing an amplifier in accordance with the present invention comprises a Gaussian signal source for generating a signal in the frequency domain, a notch filter, coupled to the Gaussian Noise source, wherein the notch filter has a notch at a specified frequency and a frequency bandwidth, the frequency bandwidth encompassing the specified frequency, an Inverse Fast Fourier Transform device, coupled to an output of the notch filter, a normalization device, coupled to the Inverse Fast Fourier Transform device, an amplifier under test, coupled to the normalization device, for amplifying the signal generated by the Gaussian signal source, and a measurement device, coupled to an output of the amplifier, for measuring a power output of the amplifier in the frequency bandwidth and a noise output at the specified notch frequency, and for calculating the ratio between the power output and the noise output.

Inventors: Zhou; Guangcai (Agoura Hills, CA), Lin; Tung-Sheng (Claremont, CA), Lai; Dennis (Cerritos, CA), Santoru; Joseph (Agoura Hills, CA), Chen; Ernest C. (San Pedro, CA), Maitra; Shamik (Redondo Beach, CA), Comeaux; Cecilia (Redondo Beach, CA)

Assignee: The DIRECTV Group, Inc.

International Classification: G01R 19/00 (20060101)

Expiration Date: 2021-05-19 0:00:00