Full-integration full-duplex transceiver based on active quasi-circulator and self-interference cancellation

Abstract

The invention discloses a full-integration full-duplex transceiver based on an active quasi-circulator and self-interference cancellation. A baseband signal is divided into two paths after passing through a quadrature up-conversion mixer, one path is connected with an antenna through a power amplifier and the active quasi-circulator, and the other path enters a receiver through a quadrature voltage-controlled transconductance amplifier. The active quasi-circulator is connected with a controller through a comparator circuit after underclocking signals leaked by the active quasi-circulator through a low-noise amplifier and a down-conversion mixer, and the active quasi-circulator is conducted only in two directions of output from a transmitter to an antenna and input from the antenna to a receiver. The received leakage signal is subtracted from the input end of the receiver to counteract the interference signal; and amplitudes I and Q of the required orthogonal composite vectors are calculated by adopting a gradient descent algorithm to realize self-interference cancellation. The full-integration full-duplex transceiver has the highest radio frequency domain self-interference cancellation ratio, has the maximum working bandwidth at present, is suitable for a 5G wireless communication system, and is particularly suitable for short-distance Bluetooth communication.

Description

technical field [0001] The invention belongs to the technical field of radio frequency integrated circuits, in particular to a fully integrated full-duplex transceiver based on an active quasi-circulator and self-interference cancellation. Background technique [0002] The growing demand for high-speed data in mobile electronics over the past two decades has necessitated higher bandwidth and higher data transfer rates in communication systems and circuits. The previous 4G communication standard could not meet people's demand for data well, so the 5G communication standard was born. The fifth generation wireless technology includes full-duplex wireless (Full-Duplex, FD), massive antenna technology (Multi-In-Multi-Out, MIMO) and millimeter wave mobile communication. Full-duplex wireless is based on a new type of wireless communication technology that can transmit and receive at the same frequency at the same time; massive MIMO and mmWave mobile communication increase the numb...

AI Technical Summary

Problems solved by technology

[0005] The existing technologies can be integrated into chips, and all of them have obtained a good self-interference cancellation ratio, but the cancellation bandwidth is relatively narrow, which cannot meet the broadband demand of future communication

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