Radio frequency self-interference suppression method and device based on photon noise cancellation

A photon noise and suppression device technology, applied in optical fiber transmission, optical fiber radio, advanced technology, etc., to achieve the effect of achieving sensitivity, high target signal reception, and enhancing the depth of cancellation

Active Publication Date: 2022-02-08
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

Traditional radio frequency self-interference cancellation is realized by electrical means. With the gradual increase of relevant requirements, the traditional method is facing a technical bottleneck

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  • Radio frequency self-interference suppression method and device based on photon noise cancellation
  • Radio frequency self-interference suppression method and device based on photon noise cancellation
  • Radio frequency self-interference suppression method and device based on photon noise cancellation

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Embodiment Construction

[0027] Aiming at the deficiencies of the prior art, the idea of ​​the present invention is to utilize the phase difference of the two output optical signals of the DOMZM by 90° and the balanced detection characteristics of the balanced photodetector to eliminate the additive noise introduced by the laser while realizing radio frequency self-interference cancellation. At the same time, the power of the target signal is increased to achieve high-sensitivity target signal reception.

[0028] The radio frequency self-interference suppression method based on photon noise cancellation proposed by the present invention is as follows:

[0029] Using two dual-output Mach-Zehnder modulators (DOMZM) biased at the orthogonal point, the RF receiving signal and the cancellation reference signal drawn from the transmitter are respectively modulated on two homologous optical carriers to obtain a 0° optical carrier receiving signal , 90° optical-carrying receiving signal, 0° optical-carrying r...

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Abstract

The invention discloses a radio frequency self-interference suppression method based on photon noise cancellation, which comprises the following steps of: respectively modulating a radio frequency receiving signal and a cancellation reference signal to two paths of homologous optical carriers by using two DOMZMs biased at an orthogonal point to obtain four paths of modulated optical signals, namely 0-degree and 90-degree optical carrier receiving signals and 0-degree and 90-degree optical carrier reference signals; adjusting the delay and power of the four paths of modulated optical signals to realize delay and power matching; and respectively carrying out balanced photoelectric detection on the 0-degree and 90-degree optical carrier receiving signals and the 0-degree and 90-degree optical carrier reference signals, and coupling the obtained two paths of electric signals into one path to obtain a target radio frequency receiving signal after radio frequency self-interference cancellation. The invention further discloses a radio frequency self-interference suppression device based on photon noise cancellation. Compared with the prior art, the bandwidth range and the cancellation depth of radio frequency self-interference cancellation can be improved, the target signal power is improved, and additive noise introduced by the laser is eliminated, so that high-sensitivity target signal receiving is realized.

Description

technical field [0001] The invention relates to a radio frequency self-interference suppression method, in particular to a radio frequency self-interference suppression method based on photon noise cancellation. Background technique [0002] At the same time, the same-frequency full-duplex technology has become one of the key technologies of the new generation of wireless communication systems due to its high utilization of spectrum resources and time resources. If the antennas are close to each other, the power of the transmitted signal will leak to the receiving antenna, so that the received target signal will be submerged in interference and noise, thereby reducing the receiving sensitivity of the target signal. Moreover, the self-interference signal leaked to the receiving end is in the same frequency band as the target signal, and cannot be filtered out simply by a filter. The most promising solution to this difficulty today is RF cancellation technology. The traditio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/525H04B10/2575
CPCH04B1/525H04B10/2575Y02D30/70
Inventor 张亚梅刘烁潘时龙邵琨麟曹冯婷李露
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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