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System and method for canceling high-transmission-power same-time same-frequency self-interference under multi-path environment

A self-interference cancellation and radio frequency interference technology, applied in transmission systems, electrical components, etc., can solve problems such as self-interference in simultaneous co-frequency full-duplex communication systems, and achieve the effects of ensuring service life, avoiding signal distortion and excellent performance.

Active Publication Date: 2013-12-04
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0008] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a system and method for canceling self-interference at the same frequency at the same time in a multi-path environment, which solves the problem of self-interference in the full-duplex communication system at the same frequency at the same time. High-performance radio frequency self-interference cancellation and double the spectrum utilization

Method used

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  • System and method for canceling high-transmission-power same-time same-frequency self-interference under multi-path environment

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[0037] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0038] Such as figure 1 As shown, the self-interference cancellation system with large transmit power and the same frequency in a multipath environment, which includes an antenna unit, a baseband transmit signal processing unit, a baseband receive signal processing unit, a transmit power control unit, an adjustment algorithm unit, and a radio frequency interference reconstruction unit Ⅰ, The radio frequency interference reconstruction unit Ⅱ, adder Ⅰ and adder Ⅱ, the output of the baseband transmission signal processing unit is connected to the radio frequency transmission channel through the digital-to-analog converter Ⅰ (DAC Ⅰ), and the output of the radio frequency transmission channel is connected to the transmitting end of the antenna u...

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Abstract

The invention discloses a system and method for canceling high-transmission-power same-time same-frequency self-interference under the multi-path environment. The method includes the steps that at the transmitting end, a transmission power control unit is used for controlling radio-frequency signal power of the transmitting end to be a low noise amplifier unsaturated low power value of the receiving end and sending radio-frequency signals of the transmitting end into a radio-frequency interference reestablishing unit I and a radio-frequency interference reestablishing unit II; at the receiving end, and radio-frequency signals output by an antenna unit and the signals processed by the radio-frequency interference reestablishing unit I are subtracted to complete cancellation of radio-frequency self-interference for the first time; then the radio-frequency signal power of the transmitting end is controlled to be a high-power value, and at the receiving end, after the signals enabling the radio-frequency self-interference to be canceled for the first time are amplified by a low noise amplifier, the signals and the signals processed by the radio-frequency interference reestablishing unit II are subtracted to complete cancellation of radio-frequency self-interference for the second time. The system and method for canceling the high-transmission-power same-time same-frequency self-interference under the multi-path environment are suitable for a same-time same-frequency system, improve canceling capacity of high-transmission-power radio-frequency self-interference signals, improve communication stability, and double the spectrum utilization rate.

Description

technical field [0001] The invention relates to a system and a method for removing interference in the field of wireless communication, in particular to a system and a method for canceling self-interference of the same frequency at the same time with large transmission power in a multipath environment. Background technique [0002] At present, there are two commonly used duplex modes for two-way communication in wireless communication systems: one is time division duplex mode, and the other is frequency division duplex mode. For a time division duplex system, it uses the same frequency to transmit data in different time slots; for a frequency division duplex system, it uses the same time slot to transmit data in different frequencies. Although these two traditional duplex methods isolate the interference between the uplink and downlink, they sacrifice time resources and frequency resources respectively, reducing spectrum utilization. [0003] The transmitting end and receiv...

Claims

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Application Information

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IPC IPC(8): H04B1/7107H04B1/711
Inventor 沈莹罗龙尹洪潘文生邵士海马万治唐友喜
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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