Full duplex wireless transmission with self-interference cancellation
First Claim
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1. A method comprising:
- in a full-duplex transceiver, receiving a self-interference signal over a self-interference channel that includes a propagation path from a primary transmit antenna of the full-duplex transceiver to a receive antenna of the full-duplex transceiver, wherein the primary transmit antenna is pair-wise symmetrical to the receive antenna to reduce coupling such that (i) the primary transmit antenna and the receive antenna are self-symmetrical, (ii) the primary transmit antenna and the receive antenna have different planes of symmetry, and (iii) the primary transmit antenna has an antenna configuration which is invariant under reflection in the plane of symmetry of the receive antenna and the receive antenna has an antenna configuration which is invariant under reflection in the plane of symmetry of the primary antenna;
in the full duplex transceiver, generating an interference-reduced signal by combining an analog self-interference cancellation signal to an incoming signal that includes a desired signal and the self-interference signal, wherein the analog self-interference cancellation signal destructively adds to the self-interference signal to create a residual self-interference signal; and
processing the interference-reduced signal to further reduce the residual self-interference signal using a baseband residual self-interference channel estimate.
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Abstract
Two-way (full-duplex) wireless communications. Various embodiments measure interference channels and provide for interference cancellation in both analog and digital domains to mitigate self-interference. The system supports multiple clients wherein new clients can join the network asynchronously, and also supports Multiple-Input Multiple-Output (MIMO) antennas.
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Citations
18 Claims
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1. A method comprising:
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in a full-duplex transceiver, receiving a self-interference signal over a self-interference channel that includes a propagation path from a primary transmit antenna of the full-duplex transceiver to a receive antenna of the full-duplex transceiver, wherein the primary transmit antenna is pair-wise symmetrical to the receive antenna to reduce coupling such that (i) the primary transmit antenna and the receive antenna are self-symmetrical, (ii) the primary transmit antenna and the receive antenna have different planes of symmetry, and (iii) the primary transmit antenna has an antenna configuration which is invariant under reflection in the plane of symmetry of the receive antenna and the receive antenna has an antenna configuration which is invariant under reflection in the plane of symmetry of the primary antenna; in the full duplex transceiver, generating an interference-reduced signal by combining an analog self-interference cancellation signal to an incoming signal that includes a desired signal and the self-interference signal, wherein the analog self-interference cancellation signal destructively adds to the self-interference signal to create a residual self-interference signal; and processing the interference-reduced signal to further reduce the residual self-interference signal using a baseband residual self-interference channel estimate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising:
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determining an estimate of a self-interference channel response from a primary transmitter of a transceiver to a receiver of the transceiver and determining an estimate of an auxiliary channel response from an auxiliary transmitter of the transceiver to the receiver; determining a residual self-interference baseband channel response at a baseband processor of the receiver; preprocessing a primary transmit signal and an auxiliary transmit signal with the estimated auxiliary channel response and a negative of the estimated self-interference channel response, respectively; transmitting the preprocessed primary transmit signal and the preprocessed auxiliary transmit signal in a transmit frequency range; receiving a desired signal within a receive frequency range substantially overlapping the transmit frequency range, and receiving a residual self-interference signal; reducing the residual self-interference signal using the residual self-interference baseband channel response; and
,further processing the desired signal. - View Dependent Claims (12, 13, 14, 15, 18)
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16. An apparatus comprising:
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a weight calculation unit configured to measure a self-interference channel and an auxiliary channel to obtain an estimate of the self-interference channel and an estimate of the auxiliary channel; a full-duplex transceiver having a primary transmitter, an auxiliary transmitter, and a receiver, wherein the primary transmitter and auxiliary transmitter are configured to preprocess a training sequence to generate two transmit signals, such that the two transmit signals respectively traverse the self-interference channel and the auxiliary channel and combine to form an analog residual interference signal at the receiver of the full-duplex transceiver; an analog to digital converter and a receiver baseband processor at the receiver being configured to measure a baseband residual self-interference channel response; and
,the transceiver being further configured to cancel self-interference signals using the auxiliary channel and to cancel residual self-interference signals using the measured baseband residual self-interference channel response. - View Dependent Claims (17)
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Specification