Analog compensation circuit and method
First Claim
1. An analog compensation circuit for a full-duplex transceiver, comprising:
- a secondary receiver configured to receive and convert a sampled self-interference signal to a baseband self-interference signal;
a tuner coupled to the secondary receiver and configured to;
receive the baseband self-interference signal,receive a baseband transmit signal, andcompute a plurality of complex gains according to the baseband transmit signal and the baseband self-interference signal; and
an analog compensator coupled to the tuner, having a plurality of branches, and configured to;
receive the plurality of complex gains,adjust respective attenuators and phase shifters in the plurality of branches using the plurality of complex gains, andprocess a sample of a transmit signal using the plurality of branches, wherein the transmit signal is up-converted from a new baseband transmit signal.
2 Assignments
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Accused Products
Abstract
Disclosed herein are an analog compensation circuit and a method for tuning an analog compensator in full-duplex transmission systems. An embodiment analog compensation circuit includes a secondary receiver configured to receive and convert a sampled self-interference signal to a baseband self-interference signal. A tuner is coupled to the secondary receiver and configured to receive a baseband transmit signal and the baseband self-interference signal, and to compute complex gains according to the baseband transmit signal and the baseband self-interference signal. An analog compensator is coupled to the tuner and has multiple branches. The analog compensator is configured to receive the complex gains and use them to adjust respective attenuators and phase shifters of the branches. The analog compensator is further configured to process a sample of a transmit signal using the branches, the transmit signal being up-converted from a new baseband transmit signal.
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Citations
26 Claims
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1. An analog compensation circuit for a full-duplex transceiver, comprising:
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a secondary receiver configured to receive and convert a sampled self-interference signal to a baseband self-interference signal; a tuner coupled to the secondary receiver and configured to; receive the baseband self-interference signal, receive a baseband transmit signal, and compute a plurality of complex gains according to the baseband transmit signal and the baseband self-interference signal; and an analog compensator coupled to the tuner, having a plurality of branches, and configured to; receive the plurality of complex gains, adjust respective attenuators and phase shifters in the plurality of branches using the plurality of complex gains, and process a sample of a transmit signal using the plurality of branches, wherein the transmit signal is up-converted from a new baseband transmit signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of tuning an analog compensation circuit for a full-duplex transceiver, comprising:
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transmitting a transmit signal up-converted from a baseband transmit signal; receiving a self-interference signal resulting from the transmitting; sampling the self-interference signal in a time domain, thereby generating a sampled self-interference signal; converting the sampled self-interference signal into a digital baseband self-interference signal; computing a plurality of complex gains in a frequency domain according to the digital baseband self-interference signal and the baseband transmit signal; and applying the plurality of complex gains to an analog compensator. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A full-duplex transceiver, comprising:
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an isolation block coupled to a common antenna at a transmit port, and having an input port and an output port; a transmit chain coupled to the input port of the isolation block and configured to generate a baseband transmit signal that is up-converted to a transmit signal for transmission through the isolation block and the common antenna; and a receive chain, through which a self-interference signal is receivable, having; a primary receive path coupled to the output port of the isolation block, a secondary receiver coupled to the primary receive path and configured to receive and convert a sampled self-interference signal to a baseband self-interference signal, a tuner coupled to the secondary receiver and the transmit chain, and configured to; receive the baseband transmit signal from the transmit chain, and compute a plurality of complex gains according to the baseband transmit signal and the baseband self-interference signal, and an analog compensator coupled to the transmit chain, the tuner, and the primary receive path, having a plurality of branches, and configured to; receive the plurality of complex gains from the tuner, adjust respective attenuators and phase shifters of the plurality of branches using the plurality of complex gains, and process a sample of another transmit signal from the transmit chain using the plurality of branches to yield a compensation signal for coupling into the primary receive path. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. An analog compensation circuit for a multi-transmitter full-duplex transceiver having N transmitters and N transmit chains, comprising:
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a secondary receiver configured to receive and convert N samples of an aggregate self-interference signal to N baseband self-interference signal samples; a tuner coupled to the secondary receiver and configured to; receive N baseband transmit signal samples from each of the N transmit chains, wherein a total of N×
N baseband transmit signal samples are received, andcompute a plurality of complex gains according to the N×
N baseband transmit signal samples and the N baseband self-interference signal samples; andan analog compensator coupled to the tuner, having a plurality of branches, and configured to; receive the plurality of complex gains, adjust respective attenuators and phase shifters of the plurality of branches using the plurality of complex gains, and process respective samples of N transmit signals from the N transmit chains using the plurality of branches, wherein the N transmit signals are respectively up-converted from N baseband transmit signals. - View Dependent Claims (26)
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Specification