RF module for wireless unit configured for self-interference cancellation
First Claim
1. A radio-frequency (RF) module for use in a wireless communication device configured for interference cancellation, the RF module comprising:
- a transmit signal path to be coupled to a transmit antenna for full-duplex communications, the transmit signal path comprising a variable voltage attenuator provided in the transmit signal path prior to a power amplifier;
a receive signal path to be coupled to a receive antenna for full-duplex communications, the receive signal path comprising a variable voltage attenuator provided in the receive signal path after a low-noise amplifier; and
cancellation circuitry coupled to the receive and transmit signal paths,wherein the cancellation circuitry is configured to;
generate a pilot signal for self-interference estimation, receive a transmuted signal and generate a cancellation signal for the receive signal path to cancel self-interference based at least on receipt of the pilot signal,inject the pilot signal into the transmit signal path for transmission by the transmit antenna for self-interference estimation and generation of the cancellation signal, andgenerate an estimate of self-interference for interference between the transmit antenna and the receive antenna based on receipt of the pilot signal by the receive antenna, the estimate based on a presence of the pilot signal in the receive signal path.
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Abstract
A system and methods for cancelling transmission leakage signals in a wide bandwidth Distributed Antenna System (“DAS”) having remote units is disclosed. An internal cancellation circuit within the remote unit is employed to reduce the transmitted leakage signals by generating a cancellation signal. This cancellation signal is added to the received signal to cancel the transmission leakage signal in the receiving signal path. A pilot signal generation circuit is employed to optimize the cancellation circuit operating parameters. The frequency of the pilot signal is swept over a range to determine the pilot frequency having the highest electromagnetic coupling. The amplitude and phase of the cancellation signal is then optimized to minimize the level of transmission leakage in the receiving transmission path.
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Citations
13 Claims
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1. A radio-frequency (RF) module for use in a wireless communication device configured for interference cancellation, the RF module comprising:
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a transmit signal path to be coupled to a transmit antenna for full-duplex communications, the transmit signal path comprising a variable voltage attenuator provided in the transmit signal path prior to a power amplifier; a receive signal path to be coupled to a receive antenna for full-duplex communications, the receive signal path comprising a variable voltage attenuator provided in the receive signal path after a low-noise amplifier; and cancellation circuitry coupled to the receive and transmit signal paths, wherein the cancellation circuitry is configured to; generate a pilot signal for self-interference estimation, receive a transmuted signal and generate a cancellation signal for the receive signal path to cancel self-interference based at least on receipt of the pilot signal, inject the pilot signal into the transmit signal path for transmission by the transmit antenna for self-interference estimation and generation of the cancellation signal, and generate an estimate of self-interference for interference between the transmit antenna and the receive antenna based on receipt of the pilot signal by the receive antenna, the estimate based on a presence of the pilot signal in the receive signal path. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for a wireless communication device, the apparatus comprising:
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a transmit signal path to be coupled to a transmit antenna for full-duplex communications, the transmit signal path comprising a variable voltage attenuator provided in the transmit signal path prior to a power amplifier; a receive signal path to be coupled to a receive antenna for full-duplex communications, the receive signal path comprising a variable voltage attenuator provided in the receive signal path after a low-noise amplifier; and cancellation circuitry coupled to the receive and transmit signal paths, wherein the cancellation circuitry is configured to; generate a pilot signal for self-interference estimation, provide a cancellation signal to the receive signal path to cancel self-interference based on receipt of the pilot signal, inject the pilot signal into the transmit signal path for transmission by the transmit antenna for self-interference estimation and generation of the cancellation signal, and generate an estimate of self-interference for interference between the transmit antenna and the receive antenna based on receipt of the pilot signal by the receive antenna, the estimate based on a presence of the pilot signal in the receive signal path, the cancellation circuitry comprising non-linear circuitry including at least one bandpass filter operating as part of a feedback loop to provide non-linear positive feedback for generation of the cancellation signal. - View Dependent Claims (11)
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12. A method for interference cancellation performed by cancellation circuitry of an apparatus for a wireless communication device that includes a transmit signal path to be coupled to a transmit antenna for full-duplex communications and a receive signal path to be coupled to a receive antenna for full-duplex communications, the method comprising:
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generating a pilot signal for self-interference estimation, providing a cancellation signal to the receive signal path to cancel self-interference based on receipt of the pilot signal, wherein the pilot signal is injected into the transmit signal path for transmission by the transmit antenna for self-interference estimation and generation of the cancellation signal, and generating an estimate of self-interference for interference between the transmit antenna and the receive antenna based on receipt of the pilot signal by the receive antenna, the estimate based on a presence of the pilot signal in the receive signal path, and the cancellation circuitry comprising non-linear circuitry including at least one bandpass filter operating as part of a feedback loop to provide non-linear positive feedback for generation of the cancellation signal, wherein the receive signal path and the transmit signal path each comprises a variable voltage attenuator, the variable voltage attenuator provided in the receive signal path after a low-noise amplifier and in the transmit signal path prior to a power amplifier. - View Dependent Claims (13)
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Specification