Detecting and measuring interference contained within a digital carrier
AssigneeGlowlink Communications Technology, Inc.
InventorsJeffrey C. Chu, Michael L. Downey
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Abstract
A method and system for measuring noise and or interference in a communications signal without taking the signal out of service. In the present invention the communications signal is converted from an RF signal into an IF signal. The IF signal is then digitized and stored. The stored signal is processed to determine the interference signal. The interference signal is calculated from an error vector produced by a blind equalizer demodulator. The interference signal is extracted and presented to a user.
Claims38
A method of detecting in-band interference in a carrier signal in a communication system comprising the steps of:
- acquiring a signal including the carrier signal and an interfering signal;
- and
- extracting the interfering signal from the carrier without interrupting the carrier.
A method of detecting in-band interference in a carrier signal in a communication system comprising the steps of:
- acquiring a digital signal including receiving the signal, filtering the signal and digitizing the filtered signal;
- formatting the digital signal including filtering the digital signal, performing decimation and re-sampling of the digitized signal;
- and
- performing blind equalization and demodulation thereby forming an error vector that is representative of the interference signal.
A system of detecting in-band interference in a carrier signal in a communication system comprising:
- a receiver for acquiring a digital signal
- a signal processor for conditioning the digital signal and
- a blind equalizer demodulator forming an error vector that is representative of an interference signal included in the carrier signal.
Dependencies are inferred from the claim text.