Full Duplex Wireless Transmission with Self-Interference Cancellation
First Claim
Patent Images
1. A method comprising:
- in a 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 a self-interference signal, wherein the analog self-interference cancellation signal destructively adds to the self-interference signal to create a residual self-interference signal;
processing the interference-reduced signal to further reduce the residual self-interference signal using a baseband residual self-interference channel estimate.
0 Assignments
0 Petitions
Accused Products
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.
228 Citations
17 Claims
-
1. A method comprising:
-
in a 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 a self-interference signal, wherein the analog self-interference cancellation signal destructively adds to the self-interference signal to create a residual self-interference signal; 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, 11)
-
-
12. A method comprising:
-
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 (13, 14, 15, 16)
-
-
17. An apparatus comprising:
-
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 by; 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.
-
Specification