SYSTEM AND METHOD FOR BROADBAND RF INTERFERENCE CANCELLATION
First Claim
1. An interference cancellation system (ICS) comprising:
- a dual parallel electrical RF signal to optical signal converter having an optical input for a light source and an optical output, the converter being configured with a first arm having a first electrode configured to vary the refractive index of the first arm and a second arm having a second electrode configured to vary the refractive index of the second arm;
the first electrode being configured to receive an interferer signal combined with a desired signal, the second electrode being configured to receive an interferer reference signal;
the converter being configured to optically cancel at least a portion of the interferer signal and having a converter output configured to output the desired signal combined with a reduced interferer signal.
2 Assignments
0 Petitions
Accused Products
Abstract
Radio frequency transmission systems often suffer from the problem of co-site interference, where the frequency band of a strong radio transmitter overlaps with the frequency band of a co-located and/or remote radio receiver, such that the transmitter interferes with the ability of the receiver to detect a weak signal of interest. There is a need for a device that can process both the transmitted radio signal and the received radio signal to eliminate such interference. Previous attempts to solve this problem have been unable to cancel in-band interference in excess of 20 to 40 dB stronger than the signal of interest over a broad bandwidth, with large dynamic range, and with a high degree of linearity. Disclosed is a robust system and method for cancelling broadband in-band RF interference that operates in a dynamically changing multipath environment.
70 Citations
24 Claims
-
1. An interference cancellation system (ICS) comprising:
-
a dual parallel electrical RF signal to optical signal converter having an optical input for a light source and an optical output, the converter being configured with a first arm having a first electrode configured to vary the refractive index of the first arm and a second arm having a second electrode configured to vary the refractive index of the second arm; the first electrode being configured to receive an interferer signal combined with a desired signal, the second electrode being configured to receive an interferer reference signal; the converter being configured to optically cancel at least a portion of the interferer signal and having a converter output configured to output the desired signal combined with a reduced interferer signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 22, 23, 24)
-
-
13. An interference cancellation method comprising:
-
providing a dual parallel electrical RF signal to optical signal converter having an optical input for a light source and an optical output, the converter being configured with a first arm having a first electrode configured to vary the refractive index of the first arm and a second arm having a second electrode configured to vary the refractive index of the second arm; providing an interferer signal combined with a desired signal to the first electrode; providing an interferer reference signal to the second electrode; the converter being configured to optically cancel at least a portion of the interferer signal and output the desired signal combined with a reduced interferer signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
-
Specification