REMOTE INTERFERENCE CANCELLATION FOR COMMUNICATIONS SYSTEMS

• US 20130308732A1
• Filed: 05/21/2013
• Published: 11/21/2013
• Est. Priority Date: 05/21/2012
• Status: Active Grant

• Current Assignee: Bascom Hunter Technologies, Inc., L3 Technologies, Inc. (L3Harris Technologies, Inc.)
• Original Assignee: L-3 Communications Corporation (L3Harris Technologies, Inc.)
• Inventors: Prucnal, Paul, McCandless, Andrew, Kpodzo, Elias Bonaventure, Holland, Robert, Dourbal, Paul, Deng, Yanhua
• Granted Patent: US 9,344,125 B2
• Time in Patent Office: Days
• US Class Current: 375/346
• CPC Class Codes: H04B 1/10 Means associated with receiver for limiting or suppressing noise or interference
• CPC Class Codes: H04B 1/1027 assessing signal quality or detecting noise/interference for the received signal
• CPC Class Codes: H04B 1/109 by improving strong signal performance of the receiver when strong unwanted signals are present at the receiver input
• CPC Class Codes: H04B 10/00 Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
• CPC Class Codes: H04B 10/07955 Monitoring or measuring power
• CPC Class Codes: H04B 10/2507 for the reduction or elimination of distortion or dispersion
• CPC Class Codes: H04B 10/2575 Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04B 17/336 Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
• CPC Class Codes: H04B 2210/006 Devices for generating or processing an RF signal by optical means
• CPC Class Codes: H04K 3/20 Countermeasures against jamming in radar G01S7/36; interference suppression in receivers H04B1/10
• CPC Class Codes: H04K 3/228 Elimination in the received signal of jamming or of data corrupted by jamming interference suppression in receivers H04B1/10
• CPC Class Codes: H04L 43/16 Threshold monitoring

Abstract

An interference cancellation system (ICS) may be used with a communication system to prevent or minimize interference from one or more sources. The ICS may receive radio frequency (RF) signals comprised of one or more signals of interest (SOI) and multiple interfering signals. An interference estimation processor (IEP) may be used to estimate the one or more interfering signals. The interfering signals may be estimated using spatial and/or time diversity, which may be combined with statistical methods. The estimated interfering signals may be sent to the ICS, which may use the estimated interference signal to cancel the interference and output the SOI.

Claims

1. A system for cancelling interference, the system comprising:

an interference estimation processor configured to estimate an interference signal received from a remote and unknown location; and

an interference cancellation processor configured to;

receive the estimated interference signal and a combined signal that includes a combination of the interference signal and a signal of interest (SOI),

variably attenuate and variably time delay one or more of the interference signal or the combined signal,

convert the estimated interference signal and the combined signal to optical signals, and

cancel at least one portion of the interference signal from the combined signal based on the estimated interference signal.

2. The system of claim 1, wherein the interference estimation processor is further configured to estimate the interference signal using at least one of spatial or time diversity.

3. The system of claim 1, wherein the interference cancellation processor is further configured to:

determine whether the cancellation of the at least one portion of the interference signal meets a threshold, and

when the cancellation does not meet the threshold, cancel at least one other portion of the interference signal based on another estimated interference signal received from the interference estimation processor.

4. The system of claim 1, wherein the threshold comprises a signal-to-noise ratio associated with the combined signal.

5. The system of claim 1, wherein the threshold comprises a power level associated with the combined signal.