The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 10, 2001
Filed:
Nov. 04, 1998
Michael I. Mandell, Los Angeles, CA (US);
Arnold L. Berman, Los Angeles, CA (US);
Hughes Electrical Corporation, El Segundo, CA (US);
Abstract
A system and method for determining dispersion of intermodulation power in a satellite communication system or any other system which can be mathematically modeled as a matrix multiplication followed by an instantaneous nonlinearity and another matrix multiplication include determining a matrix (V) representing amplitudes and frequencies of signals generated by a digital processor and input to a plurality of amplifiers. A matrix (M) representing signal propagation from the amplifiers to a destination is used to determine the intermodulation power at the destination within each transmitted beam at each intermodulation distortion frequency. The intermodulation distortion frequencies are determined based on sums and differences of component frequencies corresponding to the user signals. By considering only third-order intermodulation effects and performing a frequency domain analysis, the present invention is computationally efficient enough to analyze cellular communications systems containing a large number of individual users, a large number of amplifiers, and a complex multi-beam antenna. The improvement of signal to intermodulation power ratio when going from the amplifiers on a satellite to the received signals on the ground.