TRANSMITTER NOISE SUPPRESSION IN RECEIVER
First Claim
1. A system comprising:
- a digital feedforward transmit noise cancellation subsystem configured to;
generate a digital transmitter noise cancellation signal representative of a transmitter noise in a receive band of a main receiver based on a digital feedforward signal output by a secondary receiver, the transmitter noise resulting from transmission of an analog radio frequency transmit signal by a transmitter associated with the main receiver; and
subtract the digital transmitter noise cancellation signal from a digital receive signal output by the main receiver to provide a compensated digital receive signal.
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Accused Products
Abstract
Systems and methods for suppressing transmitter noise in a receive band of a co-located receiver that are suitable for wideband applications are disclosed. In one embodiment, an analog radio frequency transmit signal output by a transmitter includes a desired signal in a transmit band of the transmitter and transmitter noise in a receive band of a main receiver. A secondary receiver obtains a secondary receiver input signal that is representative of at least the transmitter noise in the receive band of the main receiver and outputs a digital feedforward signal. A digital feedforward transmit noise cancellation subsystem generates a digital transmitter noise cancellation signal that is representative of the transmitter noise in the receive band based on the digital feedforward signal and subtracts the digital transmitter noise cancellation signal from a digital receive signal output by the main receiver to thereby provide a compensated digital receive signal.
29 Citations
20 Claims
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1. A system comprising:
a digital feedforward transmit noise cancellation subsystem configured to; generate a digital transmitter noise cancellation signal representative of a transmitter noise in a receive band of a main receiver based on a digital feedforward signal output by a secondary receiver, the transmitter noise resulting from transmission of an analog radio frequency transmit signal by a transmitter associated with the main receiver; and subtract the digital transmitter noise cancellation signal from a digital receive signal output by the main receiver to provide a compensated digital receive signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of compensating for leakage from a transmitter into a receive band of a receiver, comprising:
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generating a digital transmitter noise cancellation signal that corresponds to a transmitter noise in the receive band of the receiver, the transmitter noise resulting from transmission of an analog radio frequency transmit signal by the transmitter; and subtracting the digital transmitter noise cancellation signal from a digital receive signal output by the receiver to provide a compensated digital receive signal. - View Dependent Claims (17, 18, 19, 20)
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Specification