Transmitter noise suppression in receiver
First Claim
1. A system comprising:
- a main receiver configured to amplify and downconvert an analog radio frequency receive signal to provide a digital receive signal;
a transmitter configured to upconvert and amplify a digital transmit signal to provide an analog radio frequency transmit signal at an output of the transmitter, the analog radio frequency transmit signal comprising a desired signal in a transmit band of the transmitter and transmitter noise in a receive band of the main receiver;
a secondary receiver configured to obtain a secondary receiver input signal representative of at least the transmitter noise in the receive band of the main receiver, the secondary receiver being configured to process the secondary receiver input signal to output a digital feedforward signal; and
a digital feedforward transmit noise cancellation subsystem configured to;
generate a digital transmitter noise cancellation signal representative of the transmitter noise in the receive band of the main receiver based on the digital feedforward signal; and
subtract the digital transmitter noise cancellation signal from the digital receive signal output by the main receiver to provide a compensated digital receive signal.
1 Assignment
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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.
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Citations
26 Claims
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1. A system comprising:
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a main receiver configured to amplify and downconvert an analog radio frequency receive signal to provide a digital receive signal; a transmitter configured to upconvert and amplify a digital transmit signal to provide an analog radio frequency transmit signal at an output of the transmitter, the analog radio frequency transmit signal comprising a desired signal in a transmit band of the transmitter and transmitter noise in a receive band of the main receiver; a secondary receiver configured to obtain a secondary receiver input signal representative of at least the transmitter noise in the receive band of the main receiver, the secondary receiver being configured to process the secondary receiver input signal to output a digital feedforward signal; and a digital feedforward transmit noise cancellation subsystem configured to; generate a digital transmitter noise cancellation signal representative of the transmitter noise in the receive band of the main receiver based on the digital feedforward signal; and subtract the digital transmitter noise cancellation signal from the 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 co-located receiver, comprising:
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obtaining a signal representative of an analog radio frequency transmit signal output by the transmitter, the analog radio frequency transmit signal comprising a desired signal in a transmit band of the transmitter and transmitter noise in the receive band of the co-located receiver; processing the signal representative of the analog radio frequency transmit signal to provide a digital feedforward signal; generating a digital transmitter noise cancellation signal that corresponds to the transmitter noise in the receive band of the co-located receiver; and subtracting the digital transmitter noise cancellation signal from a digital receive signal output by the co-located receiver to provide a compensated digital receive signal. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification