Antenna feedforward interference cancellation system
First Claim
1. A method of digitally canceling interference on a received signal within a satellite payload comprising adaptively canceling interference on the received signal using an interference reference feedforward signal.
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Accused Products
Abstract
A method of digitally canceling interference on a received signal 60 within a satellite payload 44 using an interference reference feedforward signal 62 is provided. The satellite payload 44 of the present invention receives a communication signal 54 with interference via a first antenna 52. The communication signal 54 is converted into a received signal 60 and transferred to into a first input 61a of a satellite payload circuit 61. The satellite payload circuit 61 has the first input 61a, a second input 61b, and an output 61c. The output 61c is electrically coupled to the second input 61b by a feedforward signal path 70. The satellite payload circuit 61 adaptively cancels interference on the received signal 60 using an interference reference feedforward signal 62 that is transferred from the output 61c to the second input 61b via the feedforward signal path 70.
12 Citations
13 Claims
- 1. A method of digitally canceling interference on a received signal within a satellite payload comprising adaptively canceling interference on the received signal using an interference reference feedforward signal.
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10. A method of digitally canceling interference on a received signal within a satellite payload comprising:
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receiving a communication signal having interference;
converting said communication signal into the received signal;
subtracting a counter-interference signal from the received signal to form a desired signal;
digitally processing said desired signal to form an interference reference feedforward signal;
correlating said interference reference feedforward signal to said desired signal to generate an error signal; and
adaptively canceling interference on the received signal based on said error signal by generating said counter-interference signal to cancel said interference.
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11. A satellite communication system comprising:
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a first antenna for receiving a communication signal;
an analog-to-digital converter (ADC) electrically coupled to said first antenna, said ADC converting said communication signal to a received signal;
a satellite payload circuit comprising a first input, a second input, and an output, said first input is electrically coupled to said ADC;
said satellite payload circuit digitally processing said received signal to form an interference reference feedforward signal; and
a feedforward signal path electrically coupling said output to said second input, said feedforward signal path transferring said interference reference feedforward signal from said output to said second input. - View Dependent Claims (12)
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13. A communication system comprising:
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a first antenna for receiving a communication signal;
an analog-to-digital converter (ADC) electrically coupled to said first antenna, said ADC converting said communication signal to a received signal;
a subtractor electrically coupled to said ADC, said subtractor subtracting a counter-interference signal from said received signal to form a desired signal;
a digital processor electrically coupled to said subtractor, said digital processor generating said interference reference feedforward signal from said desired signal;
a correlator electrically coupled to said subtractor, said correlator comparing said interference reference feedforward signal to said desired signal to generate an error signal; and
a controller electrically coupled to said correlator and said subtractor, said controller adaptively canceling interference on said received signal based on said error signal.
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Specification