Huawei Technologies Co., Limited

Future Wei Technologies, Inc.

Huawei Technologies Canada Co., Ltd.

Huwaei Technologies Co., Ltd.

James Gary Griffiths

Michael Moher

Tho Le-Ngoc

Eddy Shi-Ning Hum

Fei Chen

Wolfgang W Oberhammer

Robert Morawski

In some examples, a delay apparatus includes a controllable delay line comprising a plurality of delay elements selectively connected in a signal path to vary a delay of a signal passing through the delay line, and a controllable phase shifter comprising reflective loads adjustable to vary a phase shift applied to the signal.

Methods and apparatus of adjusting delays of signals

System and method embodiments are provided for analog cancellation for division free duplexing for radios using MIMO. In an embodiment, a system for minimizing transmitted signals from a transmitter appearing at a co-located receiver in a division free duplexing radio includes a transmitter to transmit an analog transmitted signal; an antenna; a circulator coupled to the transmitter and the antenna; a tuning algorithm component configured to receive a copy of the analog transmitted signal from the transmitter and a sampled analog received signal from a received signal path from the circulator, wherein the sampled analog received signal is sampled at a point in the received signal path before the analog received signal is provided to a receiver; and a multitap cancellation component configured to provide a cancellation signal to couple to the analog received signal such that an amount of the analog transmitted signal appearing at the receiver is reduced.

Systems and methods for analog cancellation for division free duplexing for radios using MIMO

A tapped delay line channel model may be employed to suppress the self-interference that is introduced, at a receiver input, by a signal at a transmitter output. The self-interference may be considered to have components introduced by the internal antenna subsystem of a full duplex MIMO transceiver.

System and method for self-interference suppression structure

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.

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Braeside, Canada

James Gary Griffiths