Lockheed Martin Corporation

University of Nebraska

Billy D Pettijohn

Khalid Sayood

Michael W Hoffman

Richard H Sherman

Erik Jan Paulley

MacDaniel J Radigan

Chamroenu Kchao

A Least Mean Squares (LMS) polynomial estimator is disclosed. The LMS polynomial estimator may be a LMS moving window polynomial estimator capable of performing real-time polynomial estimation and evaluation of successive time derivatives of a function of a single variable up to a specified polynomial order. The estimator makes a unique use system memory that allows for the evaluation of the least squares normal equations with a very low computational footprint. This allows the estimator to be realizable in computationally-constrained environments such as embedded systems. The LMS polynomial estimator may be implemented in a frequency estimator for estimation of the phase, frequency, Doppler, delta Doppler, and/or higher order time derivatives of phase. Estimates may be performed in real time, running at the same rate as the inbound signal.

Signal estimator

A non-transitory computer-readable medium, method, and system for processing a first data stream being in a first format from a link, the first data stream having a plurality of frames, each frame having a fixed frame length; selecting a plurality of sections of the first data stream based on a harmonic pattern of the first format, each selected section being separated from a neighboring selected section by a fixed separation length that is a whole number multiple of the fixed frame length; and creating a second data stream in a second format that includes a contiguous sequence of the selected sections. The second data stream can be further processed to acquire frame alignment with a reduction of required processing power.

Harmonic decimation of real time data for unique word (or sync cell) acquisition in a limited processing environment

Disclosed is aAsystem and method for joint source-channel encoding, symbol decoding and error correction, preferably utilizing an arithmetic encoder with operational error detection space; and a combination sequential, and arithmetic, encoded symbol decoder structure.

System and method for joint source-channel encoding, with symbol, decoding and error correction

Systems and methods for protecting privacy in transmitting an analog information signal. The present invention combines the information signal with an analog random signal generated by a chaotic circuit and transmits the signal. The received signal is synchronized using a receiving chaotic circuit. The received signal is demodulated using a synchronized replica of the analog random signal. The information signal is recovered since the product of the random signals generated in the transmitter and in the receiver, is unity. Techniques used in the present invention for generating chaos, synchronization, and signal recovery are also disclosed.

Chaotic privacy system and method

Disclosed is a system and method for joint source-channel encoding, symbol decoding and error correction, preferably utilizing an arithmetic encoder with operational error detection space; and a combination sequential, and arithmetic, encoded symbol decoder structure.

Growing community of inventors

Mountain View, CA, United States of America

Billy D Pettijohn