Accession Number : ADD009847

Title :   Pulse Interference Cancelling System for Spread Spectrum Signals.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Gutleber,Frank S

Report Date : 27 Sep 1982

Pagination or Media Count : 17

Abstract : Cancellation of pulse interference with no loss in the received level of the desired signal is obtained for a spread spectrum system which utilizes orthogonal multiplexed noise codes which when orthogonally multiplexed, matched-filter detected and linearly added, compress to a lobeless impulse. The noise codes are comprised of binary noise codes which compress to a code bit width tau. The pulse interference is eliminated by means of a variable delay line and a linear adder coupled to the output of a linear adder which operates in combination with a pair of matched filters to provide a lobeless impulse signal. The delay line is varied to provide a 180 degrees phase shift for any pulse interference signal which occurs in time coincidence with the lobeless impulse. The original and phase shifted pulse interference signals are added together in the linear adder and, in the linear adder and, in the process, cancel one another while leaving the lobeless impulse singal with no reduction in signal amplitude.

Descriptors :   *Patent applications, *Cancellation, *Interference, *Spread spectrum, *Pulses, Matched filters, Noise, Binary notation, Coincidence counting, Variables, Time, Amplitude, Signals, Delay lines, Coding

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE