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Common-frequency self-interference elimination system and method of in-band full duplex wireless communication system

A wireless communication system, self-interference cancellation technology, applied in transmission systems, electrical components, etc., can solve problems such as limited modulation bandwidth of electro-absorption modulators

Inactive Publication Date: 2016-01-06
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

This scheme is limited by the modulation bandwidth of the electro-absorption modulator, and there is still room for development and utilization of spectrum resources in higher frequency bands

Method used

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  • Common-frequency self-interference elimination system and method of in-band full duplex wireless communication system

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Embodiment Construction

[0046] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0047] The same-frequency self-interference elimination system of an in-band full-duplex wireless communication system provided by the present invention includes: a signal transceiver module, a signal amplification delay module, a signal modulation module, an optical fiber, and a photoelectric conversion module;

[0048] - the signal transceiving module is used to receive the corresponding microwave signal, and send the radio frequency signal to the signal amplification and delay module;

[0049] ...

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Abstract

The invention provides a common-frequency self-interference elimination system and method of an in-band full duplex wireless communication system. The common-frequency self-interference elimination system comprises a signal transceiver module, a signal amplification and delay module, a signal modulation module, an optical fiber and a photoelectric conversion module; the signal transceiver module is used for receiving a corresponding radio frequency signal and sending the radio frequency signal to the signal amplification and delay module; the signal amplification and delay module is used for amplifying and delaying the radio frequency signal; the signal modulation module is used for eliminating a self-interference signal in the radio frequency signal to obtain a useful signal and transmitting the useful signal to the photoelectric conversion module through the optical fiber; and the photoelectric conversion module is used for converting the received useful signal into corresponding electric data and outputting the electric data. The common-frequency self-interference elimination system provided by the invention eliminates the interference signal by use of a dual drive Mach-Zehnder modulator and a voltage-controlled gain microwave amplifier, so that the coherence is excellent, and improved inhibition bandwidth and inhibition ratio performance are obtained.

Description

technical field [0001] The present invention relates to the technical fields of optical communication and wireless communication, in particular to a same-frequency self-interference elimination system and method applied to an in-band full-duplex wireless communication system. Background technique [0002] With the commercialization of the fourth-generation mobile communication network and the continuous application of various novel wireless multimedia services, the user's demand for the transmission rate and transmission capacity of the wireless communication system has increased sharply, and better utilization and expansion of limited spectrum resources have become an urgent problem to be solved. question. The improvement of wireless transmission rate needs to improve spectral efficiency, increase available bandwidth, or develop new frequency bands with higher frequencies. Improving spectral efficiency, that is, developing higher-order modulation formats, is costly. The s...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/525
Inventor 张云昊肖石林张鹿张少杰陈操胡卫生
Owner SHANGHAI JIAO TONG UNIV
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