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

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...

AI Technical Summary

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,

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