Analog compensation circuit and method
First Claim
1. An compensation circuit for a multi-transmitter full-duplex transceiver, comprising:
- a tuner configured to;
receive N baseband transmit signal samples from each of N transmit chains associated with a respective one of N transmitters, wherein a total of NxN baseband transmit signal samples are received, wherein N is a natural number; and
compute a plurality of complex gains according to the NxN received baseband transmit signal samples and N baseband self-interference signal samples; and
an analog compensator coupled to the tuner, having a plurality of branches, each of the plurality of branches having a voltage-controlled attenuator and a voltage-controlled phase shifter, and configured to;
adjust at least one of the voltage-controlled attenuators and voltage-controlled phase shifters in accordance with an associated gain from the plurality of complex gains; and
generate a compensation signal by combining processed signals from the plurality of branches.
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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.
22 Citations
20 Claims
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1. An compensation circuit for a multi-transmitter full-duplex transceiver, comprising:
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a tuner configured to; receive N baseband transmit signal samples from each of N transmit chains associated with a respective one of N transmitters, wherein a total of NxN baseband transmit signal samples are received, wherein N is a natural number; and compute a plurality of complex gains according to the NxN received baseband transmit signal samples and N baseband self-interference signal samples; and an analog compensator coupled to the tuner, having a plurality of branches, each of the plurality of branches having a voltage-controlled attenuator and a voltage-controlled phase shifter, and configured to; adjust at least one of the voltage-controlled attenuators and voltage-controlled phase shifters in accordance with an associated gain from the plurality of complex gains; and generate a compensation signal by combining processed signals from the plurality of branches. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A compensation circuit for a multi-transmitter full-duplex transceiver, comprising:
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a tuner having a processor and a memory connected to the processor, the memory having stored thereon instructions that, when executed cause the processor to; compute a plurality of complex gains according to a baseband transmit signal and a baseband self-interference signal; and an analog compensator coupled to the tuner, and the analog compensator comprising; a power splitter connected to a signal input; a plurality of branches connected in parallel to the power splitter, each of the plurality of branches having at least a voltage-controlled attenuator in series with a voltage-controlled phase shifter; and a power combiner connected to each of the plurality of branches and to a signal output; wherein the analog compensator is configured to generate voltage signals according to the plurality of complex gains and adjust the voltage-controlled attenuator and the voltage-controlled phase shifter of at least one the plurality of branches with the voltage signals. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of tuning an analog compensation circuit for a multi-transmitter full-duplex transceiver, comprising:
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receiving N baseband transmit signal samples from each of N transmit chains associated with a respective one of N transmitters in the multi-transmitter full-duplex receiver, wherein a total of N×
N baseband transmit signal samples are received, and wherein N is a natural number;computing a plurality of complex gains according to the N×
N received baseband transmit signal samples and N baseband self-interference signal samples;adjusting an analog compensator having a plurality of branches by adjusting one or more of the plurality branches in accordance with at least one associated gain of the plurality of complex gains; and generate a compensation signal by combining processed signals from the plurality of branches. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification