Self-interference signal elimination device and elimination method thereof
A technology of signal elimination and self-interference, applied in the field of microwave photonics, which can solve the problem of difficult to filter out the interference signal by electric filter
Active Publication Date: 2021-11-02
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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However, since the transmitting signal and the receiving signal are located in the same frequency band, the interference signal is difficult to filter out through the electric filter. Therefore, it is urgent to study the radio frequency interference elimination technology with wideband and large dynamic range.
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[0044] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. It should be understood, however, that these descriptions are exemplary only, and are not intended to limit the scope of the present disclosure. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concepts of the present disclosure.
[0045] The terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting of the present disclosure. The terms "comprising", "comprising", etc. used herein indicate the presence of stated features,...
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The invention provides a self-interference signal elimination device and an elimination method thereof, which are used for eliminating a self-interference signal in a received signal received by a receiving antenna from a transmitting antenna to obtain a target signal expected to be received, and comprises the following steps: S1, respectively modulating the received signal and a reference signal into an optical signal, wherein the received signal and the reference signal have a phase difference introduced in a delayed manner; S2, performing polarization processing on the optical signal, so that the projection directions of the receiving signal and the reference signal in the horizontal direction are opposite; and S3, filtering the received signal and the reference signal in the vertical direction, and superposing the received signal and the reference signal in the horizontal direction, so that the reference signal and the self-interference signal are counteracted in the horizontal direction. According to the self-interference signal elimination device and the elimination method thereof disclosed by the invention, interference cancellation of a single-frequency signal and a broadband signal can be realized by utilizing an optical method, and meanwhile, frequency down-conversion can be realized, so that power fading caused by optical fiber dispersion is avoided.
Description
technical field [0001] The disclosure relates to the technical field of microwave photonics, in particular to a self-interference signal canceling device and a canceling method thereof. Background technique [0002] With the continuous development of science and technology, the demand for wireless communication transmission rate is getting higher and higher. Improving spectrum utilization efficiency and maximizing the use of limited spectrum resources is one of the biggest challenges facing 5G and 6G communications. current research hotspot. [0003] The in-band full-duplex technology doubles the efficiency of spectrum utilization because it can simultaneously transmit and receive signals on the same frequency band. Generally speaking, during in-band full-duplex communication, due to the close arrangement of the transmitting antenna and the receiving antenna, the high-power microwave signal emitted by the transmitting antenna will be reflected or leaked to the receiving ant...
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IPC IPC(8): H04B1/525H04B10/2575
CPCH04B1/525H04B10/2575Y02D30/70
Inventor 王璐袁海庆李光毅石迪飞李明祝宁华李伟
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI