SYSTEM AND METHOD FOR TRANSMISSION INTERFERENCE CANCELLATION IN FULL DUPLEX TRANSCEIVER
First Claim
1. A device for use with a transmission signal generator operable to generate a transmission signal and an antenna operable to transmit a transmit signal and to receive a reception signal, said device comprising:
- a first transmitter operable to generate an output signal based on the transmission signal;
a second transmitter operable to generate a cancellation signal;
a duplexer operable to receive a first signal, to receive a second signal, to separate the second signal from the first signal and to generate a duplexed signal, the first signal being based on the output signal and the second signal being based on the reception signal;
a combiner operable to combine a third signal and a fourth signal and to generate a received signal the third signal being based on the cancellation signal and the fourth signal being based on the duplexed signal;
a first receiver operable to receive a fifth signal based on the received signal; and
a second receiver in communication with said second transmitter and operable to receive a sixth signal and to generate a control signal, the sixth signal being based on the received signal,wherein the cancellation signal is based on the control signal, andwherein a portion of the received signal includes interference based on the first signal
1 Assignment
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Accused Products
Abstract
A full duplex transceiver has cancellation circuitry that includes an auxiliary receiver and an auxiliary transmitter. More specifically, an analog received signal that includes transmission signal leakage is provided to a low noise amplifier (LNA), which then provides its output to a main receiver and the auxiliary receiver. The auxiliary receiver includes a portion operable to convert the received signal from the analog domain to the digital domain. The auxiliary receiver additionally includes a cancellation processor that determines the transmission signal leakage and generates a signal based on the determined leakage. This signal generated by the auxiliary receiver is provided to the auxiliary transmitter, which converts the digital signal back to the analog domain and generates a cancellation signal. The analog cancellation signal is fed back and added to the received signal at the input of the LNA. As a result of the feedback system including an auxiliary receiver and an auxiliary transmitter, transmission signal leakage of many types may be canceled from a received signal.
159 Citations
23 Claims
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1. A device for use with a transmission signal generator operable to generate a transmission signal and an antenna operable to transmit a transmit signal and to receive a reception signal, said device comprising:
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a first transmitter operable to generate an output signal based on the transmission signal; a second transmitter operable to generate a cancellation signal; a duplexer operable to receive a first signal, to receive a second signal, to separate the second signal from the first signal and to generate a duplexed signal, the first signal being based on the output signal and the second signal being based on the reception signal; a combiner operable to combine a third signal and a fourth signal and to generate a received signal the third signal being based on the cancellation signal and the fourth signal being based on the duplexed signal; a first receiver operable to receive a fifth signal based on the received signal; and a second receiver in communication with said second transmitter and operable to receive a sixth signal and to generate a control signal, the sixth signal being based on the received signal, wherein the cancellation signal is based on the control signal, and wherein a portion of the received signal includes interference based on the first signal - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system comprising:
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a transmission signal generator operable to generate a transmission signal; an antenna operable to transmit a transmit signal and to receive a reception signal; a first transmitter operable to generate an output signal based on the transmission signal; a second transmitter operable to generate a cancellation signal; a duplexer operable to receive a first signal, to receive a second signal, to separate the second signal from tire first signal and to generate a duplexed signal the first signal being based on the output signal and the second signal being based on the reception signal; a combiner operable to combine a third signal and a fourth signal and to generate a received signal, the third signal being based on the cancellation signal and the fourth signal being based on the duplexed signal; a first receiver operable to receive a fifth signal based on the received signal; and a second receiver in communication with said second transmitter and operable to receive a sixth signal and to generate a control signal, the sixth signal being based on the received signal, wherein the cancellation signal is based on the control signal, and wherein a portion of the received signal, includes interference based on the first signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of reducing transmit signal interference in a reception signal in a system having a transmission signal generator operable to generate a transmission signal and an antenna operable to transmit the transmit signal and to receive the reception signal said method comprising:
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generating an output signal based on the transmission signal; generating a cancellation signal; receiving a first signal based on the output signal; receiving a second signal based on the reception signal; separating the second signal from the first signal; generating a duplexed signal; combining a third signal and a fourth signal, the third signal being based on the cancellation signal and the fourth signal being based on the duplexed signal; generating a received signal; receiving a fifth signal based on the received signal; and generating a control signal, wherein the cancellation signal is based on the control signal, and wherein a portion of the received signal includes interference based on the first signal. - View Dependent Claims (16, 17, 18, 19)
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20. A device for use with a transmission signal generator operable to generate a transmission signal and an antenna operable to transmit a transmit signal and to receive a reception signal, said device comprising:
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a first transmitter operable to generate an output signal based on the transmission signal; a duplexer operable to receive a first signal, to receive a second signal, to separate the second signal from the first signal and to generate an analog duplexed signal, the first signal being based on the output signal and the second signal being based on the reception signal; a first receiver operable to receive an analog third signal based on the analog duplexed signal; and circuitry operable to receive the analog third signal, to generate a digital control signal based on the analog third signal, to generate an analog cancellation signal based on the digital control signal, and to add the analog cancellation signal to the analog duplexed signal, wherein in a portion of the analog duplexed signal includes interference based on the first signal. - View Dependent Claims (21, 22, 23)
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Specification