Full duplex radio frequency interference deleting device and method

A full-duplex radio and radio frequency interference technology, applied to electrical components, transmission systems, etc., can solve the problems of unobvious full-duplex gain, MIMO diversity/multiplex gain not being effectively utilized, etc., to reduce out-of-band interference , the effect of eliminating interference

Inactive Publication Date: 2013-09-11
BEIJING UNIV OF TECH
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this system is: the dependence on the antenna spacing makes the maximum interference suppression capability concentrated at the center frequency, which is not suitable for broadband systems; compared with the 3×3 MIMO (Multi-input Multi-output) space division multiplexing system, The gain of full-duplex is not obvious; it is necessary to manually adjust the amplitude and phase of the antenna to achieve interference zeroing, which limits practical applications
Although this technology has the function of suppressing self-interference, the diversity / multiplexing gain of MIMO itself has not been effectively utilized

Method used

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  • Full duplex radio frequency interference deleting device and method
  • Full duplex radio frequency interference deleting device and method
  • Full duplex radio frequency interference deleting device and method

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Embodiment Construction

[0025] Specific embodiments of the present invention are given below.

[0026] A full-duplex radio frequency interference canceling device, its composition block diagram is as follows figure 1 As shown, including: circulator, power divider, passive attenuation and delay circuit, Balun converter.

[0027] A three-port circulator is selected as the circulator, and the three ports are port 1, port 2, and port 3. Ports 1, 2, and 3 are respectively connected to a power splitter, an antenna, and a Balun converter. The circular direction of the circulator is: from terminal 1 → terminal 2 → terminal 3 → terminal 1. The transmit signal is input from port 1, output from port 2, and radiated into the air by the antenna; the received signal is input from port 2, and output from port 3. Because the impedance of the input / output port of the circulator is not completely matched, there is signal leakage between the sending port 1 and the receiving port 3, and the isolation is generally abo...

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Abstract

The invention belongs to the filed of full duplex radio communication interference resistance, and discloses a full duplex radio frequency interference deleting device and method. The frequency interference deleting device is composed of a circulator, a power divider, a passive attenuation and delay circuit and a Balun convertor. An RF signal output by a transmitting branch circuit is branched off a very small signal by the power divider, after the signal passes through the attenuation and delay circuit, a regenerative interference signal which is equal to a self-interference signal in amplitude and phase, the self-interference signal is leaked on the circulator when the transmitting signal passes through the circulator, the two signals are added to the Balun convertor simultaneously and then are offset mutually, and therefore the purpose that the self-interference generated by the transmitting signal to a receiving branch circuit is eliminated is achieved. The passive attenuation and delay circuit is adopted to replace an active isolating method, out-of-band leakage does not occur, and out-of-band interference is greatly reduced.

Description

technical field [0001] The invention belongs to the field of radio communication anti-interference, and in particular relates to a full-duplex radio frequency interference deletion device and method. Background technique [0002] With the rapid development of radio communication technology, full-duplex radio frequency interference cancellation technology has aroused great interest of researchers all over the world. In 2005, Professor Khandani of the University of Waterloo invented the full-duplex radio technology based on antenna isolation. Three antennas were placed asymmetrically at the transceiver end, and the distance between the two transmitting antennas and one receiving antenna was l and 1+λ ​​respectively. / 2, which makes the transmit signal 180 degrees out of phase and can cancel self-interference in the receive channel. [0003] Using a similar antenna configuration method, Choi from Stanford University designed a full-duplex IEEE802.15.4 system, using antennas, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/10H04B1/12
Inventor 黎海涛吕海坤
Owner BEIJING UNIV OF TECH
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