Fully Integrated Full-Duplex Transceiver Based on Active Quasi-Circulator and Self-Interference Cancellation
A technology of self-interference cancellation and circulator, applied in the near-field transmission system of transceivers, electrical components, transmission systems, etc., can solve the problems of narrow offset bandwidth and inability to meet the needs of future communication broadband, and achieve easy addition and subtraction , high self-interference cancellation ratio in the radio frequency domain, and the effect of saving chip area
Active Publication Date: 2021-11-19
XI AN JIAOTONG UNIV
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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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[0038] see figure 1 , a fully integrated full-duplex transceiver based on active quasi-circulator and self-interference cancellation of the present invention adopts the mode of on-chip integration, and the baseband signal of the transmitter is passed through a quadrature up-conversion mixer (Mixer I1 、Mixer I2 、Mixer Q1 、Mixer Q2 ) is divided into two circuits, one is connected to the antenna through the power amplifier (PA) and the active quasi-circulator (Active Circulator), and the other is connected to the antenna through the quadrature voltage-controlled transconductance amplifier (VOTA I 、VOTA Q ) enters the receiver after self-interference radio frequency cancellation, and passes through the low-noise amplifier (LNA) and the down-conversion mixer (Mixer) together with the signal leaked from the active quasi-circulator (Active Circulator) D ) and the comparator are connected to the controller (Controller), and the controller is realized by an off-chip Field Programma...
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The invention discloses a fully-integrated full-duplex transceiver based on an active quasi-circulator and self-interference cancellation. The baseband signal is divided into two paths after being passed through a quadrature up-conversion mixer, and one path is passed through a power amplifier and an active quasi-circulator. Antenna connection, the other channel enters the receiver through the quadrature voltage-controlled transconductance amplifier, together with the signal leaked from the active quasi-circulator, it passes through the low-noise amplifier and the down-conversion mixer and then connects with the controller through the comparator circuit. The source quasi-circulator is only turned on in two directions from the transmitter output to the antenna and the antenna to the receiver input, and the input of the receiver is subtracted from the received leakage signal to cancel the interference signal; the gradient descent algorithm is used to calculate the required The magnitudes I and Q of the orthogonal composite vector realize self-interference cancellation. The invention not only has the highest self-interference cancellation ratio in the radio frequency domain, but also has the largest working bandwidth at present, and is suitable for 5G wireless communication systems, especially 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...
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IPC IPC(8): H04B1/40H04B5/02H04B15/00H04B5/48
CPCH04B1/40H04B15/00H04B5/48
Inventor 耿莉唐炳俊许江涛
Owner XI AN JIAOTONG UNIV