Non-adaptive phase-difference interference filter

Details Non-adaptive phase-difference interference filter Non-adaptive phase-difference interference filter

1991-06-11

1996-08-06

Gregory, Bernarr E.

Pulse or digital communications

Systems using alternating or pulsating current

Antinoise or distortion

375200, 375346, 375350, 36472401, H04B 1500, G06F 1710

Patent

active

055441998

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.degree. or 270.degree. out-of-phase with interference. By estimating this component, high quality reception of spread spectrum radio communication signals in an interference environment is possible.

REFERENCES:
patent: 4953184 (1990-08-01), Simone
J. Bond et al, "Adaptive Locally Optimum Detection Based Upon Kernel Estiion"; (Naval Ocean Systems Center, San Diego; Technical Report 1307, Aug. 1989).

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