PIM COMPENSATION IN A RECEIVER
First Claim
1. A communication device comprising:
- a transmitter configured to receive an input signal and output a radio frequency transmit signal that is transmitted by the communication device;
a main receiver configured to receive a radio frequency receive signal and output a main receiver output signal, the main receiver output signal comprising passive intermodulation distortion that is a non-linear function of the radio frequency transmit signal output by the transmitter;
a tunable non-linear circuit configured to generate an intermodulation product signal comprising a plurality of intermodulation products as a function of a signal that is indicative of the radio frequency transmit signal;
an auxiliary receiver configured to receive the intermodulation product signal to provide an auxiliary receiver output signal comprising only a subset of the plurality of intermodulation products that fall within a passband of the main receiver;
an adaptive filter configured to adaptively filter the auxiliary receiver output signal to provide a passive intermodulation estimate signal that is an estimate of the passive intermodulation distortion in the main receiver output signal; and
subtraction circuitry configured to subtract the passive intermodulation estimate signal from the main receiver output signal to thereby provide a compensated output signal.
1 Assignment
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Accused Products
Abstract
The present disclosure relates to compensation for Passive Intermodulation (PIM) distortion in a receiver. In one embodiment, a main receiver receives a radio frequency receive signal and outputs a main receiver output signal. In order to compensate for PIM distortion, a tunable non-linear circuit generates an Intermodulation Products (IMP) signal that includes a number of IMPs as a function of a signal that is indicative of the radio frequency transmit signal. An auxiliary receiver receives the IMP signal and outputs an auxiliary receiver output signal that includes only a subset of the IMPs that fall within a passband of the main receiver. The auxiliary receiver output signal is adaptively filtered to provide a PIM estimate signal, which is then subtracted from the main receiver output signal to provide a compensated output signal.
40 Citations
21 Claims
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1. A communication device comprising:
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a transmitter configured to receive an input signal and output a radio frequency transmit signal that is transmitted by the communication device; a main receiver configured to receive a radio frequency receive signal and output a main receiver output signal, the main receiver output signal comprising passive intermodulation distortion that is a non-linear function of the radio frequency transmit signal output by the transmitter; a tunable non-linear circuit configured to generate an intermodulation product signal comprising a plurality of intermodulation products as a function of a signal that is indicative of the radio frequency transmit signal; an auxiliary receiver configured to receive the intermodulation product signal to provide an auxiliary receiver output signal comprising only a subset of the plurality of intermodulation products that fall within a passband of the main receiver; an adaptive filter configured to adaptively filter the auxiliary receiver output signal to provide a passive intermodulation estimate signal that is an estimate of the passive intermodulation distortion in the main receiver output signal; and subtraction circuitry configured to subtract the passive intermodulation estimate signal from the main receiver output signal to thereby provide a compensated output 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 operation of a communication device comprising:
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receiving, via a main receiver, a radio frequency receive signal to provide a main receiver output signal, the main receiver output signal comprising passive intermodulation distortion that is a non-linear function of a radio frequency transmit signal of a companion transmitter; generating an intermodulation product signal comprising a plurality of intermodulation products as a function of a signal that is indicative of the radio frequency transmit signal; capturing only a subset of the plurality of intermodulation products that fall within a passband of the main receiver from the intermodulation product signal via an auxiliary receiver to thereby provide an auxiliary receiver output signal; adaptively filtering the auxiliary receiver output signal to provide a passive intermodulation estimate signal that is an estimate of the passive intermodulation distortion in the main receiver output signal; and subtracting the passive intermodulation estimate signal from the main receiver output signal to thereby provide a compensated output signal. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification