Accession Number : ADD018269

Title :   Non-Adaptive Phase-Difference Interference Filter.

Descriptive Note : Patent, Filed 11 Jun 91, patented 5 Aug 96,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Bond, James W

Report Date : 05 Aug 1996

Pagination or Media Count : 15

Abstract : An interference suppression system utilizes a non-adaptive filter to suppress interference from bandspread communication signals. The filter is effective in the cancellation of interference from a bandspread communication signal when the interference dominates the communication signal and Gaussian noise. This invention requires a processor without highly specialized hardware components. The components are cheaper and easier to produce because the required processor needs to perform fewer calculations by several orders of magnitude than previously existing processors providing roughly equivalent interference suppression. By forming phase differences, the filter is used to estimate whether the signed magnitude of a component of a communication signal phase difference is either 90 or 270 degrees out-of-phase with interference. By estimating this component, high quality reception of spread spectrum radio communication signals in an interference environment is possible.

Descriptors :   *RADIOFREQUENCY FILTERS, *PATENTS, GAUSSIAN NOISE, NOISE REDUCTION, CANCELLATION, NOISE(RADIO), RADIO INTERFERENCE, SUPPRESSION, RADIO RECEPTION

Subject Categories : Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE