The Aerospace Corporation

Lan Xu

Robert Bernhard Dybdal

Christopher Joseph Clark

Samuel Joseph Curry

Charles C Wang

Don J Hinshilwood

Samuel Lim

Under one aspect, a system includes circuitry that digitizes and Fourier transforms first and second beams and outputs first and second sets of spectral bins. Each bin may include a portion of a group of signals or interference. The circuitry compares the collective power levels of each set of spectral bins to a predetermined threshold, and excises at least one bin of that set that contains the interference if the collective power level of that set exceeds the predetermined threshold. The circuitry determines an angular location of the interference based on excised bins, combines remaining bins with weights selected to form a null in a pattern of the first and second beams that is aligned with the interference's angular location, and inversely Fourier transforms the combined remaining bins and outputs the group of signals less any interference that was excised or excluded by the null.

Systems and methods for reducing narrow bandwidth and directional interference contained in broad bandwidth signals

Under one aspect of the present invention, a system for processing a group of signals and interference includes (a) an analog-to-digital (A/D) converter for digitizing the group of signals and the interference; (b) a Fourier transform circuit for obtaining a Fourier transform of the digitized group of signals and the interference and to provide as output spectral bins, at least one of which contains the interference; (c) a power analysis circuit for comparing the collective power level of the spectral bins to a predetermined threshold, and if the collective power level exceeds the predetermined threshold, and for excising at least one bin that contains the interference; and (d) an inverse Fourier transform circuit for obtaining an inverse Fourier transform of the remaining spectral bins and outputting a digitized group of signals less the interference in any excised spectral bin.

Systems and methods for reducing narrow bandwidth interference contained in broad bandwidth signals

Hierarchical modulation preferably uses a 16-ary quadrature amplitude modulation (QAM) modulator with a convolutional encoder that combine to effectively provide unequal protection to two different segments of streaming input data, with improved power efficiency with the same bandwidth efficiency, by encoding the first segment as coded data as LSBs as the second segment remains uncoded as uncoded MSBs, with the MSBs used for QAM constellation modest reliability interquadrant demodulation and detection, and with the LSBs used for low reliability intraquadrant detection, but with the LSBs subject to convolutional encoding and decoding rendering the LSBs with high reliability detection, such that, the two segments have unequal coding and modulation for providing unequal levels of reliability detection.

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Cerritos, CA, United States of America

Lan Xu