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

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...

AI Technical Summary

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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