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Cancellation method and system for self-interference signal

A self-interference and signal technology, applied in the field of communication, can solve the problem of low cancellation efficiency

Active Publication Date: 2018-03-20
ZHEJIANG DAHUA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Embodiments of the present invention provide a self-interference signal cancellation method and system, which are used to solve the technical problem of low cancellation efficiency in the self-interference signal cancellation method adopted by the existing RFID system, and greatly reduce the complexity of the algorithm , which improves the cancellation efficiency

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  • Cancellation method and system for self-interference signal
  • Cancellation method and system for self-interference signal
  • Cancellation method and system for self-interference signal

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Embodiment 1

[0120] Please refer to figure 1 , Embodiment 1 of the present application provides a method for canceling self-interference signals, including:

[0121] S101: Receive a self-interference signal from a transmitter, map the self-interference signal to an IQ Cartesian vector coordinate system, and determine the quadrant interval where the self-interference signal is located;

[0122] S102: Determine a quadrant interval for selecting a cancellation signal based on the quadrant interval where the self-interference signal is located, and determine a first cancellation satisfying a first preset condition from the quadrant interval for selecting a cancellation signal signal, and determining a target cancellation area based on the first cancellation signal;

[0123] S103: traverse the target cancellation area, and determine a second cancellation signal that meets a second preset condition from the target cancellation area;

[0124] S104: Combine the self-interference signal with the ...

Embodiment 2

[0175] Based on the same inventive concept as the first embodiment of the present application, please refer to Figure 11 , the embodiment of the present application also provides a self-interference signal cancellation system, including a transmitter 10, a receiver 20, a self-interference cancellation signal generator 30, and a combiner 40, wherein,

[0176] Self-interference cancellation signal generator 30 is connected with transmitter 10 and combiner 40 respectively, is used to receive self-interference signal from transmitter 10, and described self-interference signal is mapped to IQ Cartesian vector coordinate system, determines described The quadrant interval where the self-interference signal is located; based on the quadrant interval where the self-interference signal is located, determine the quadrant interval for selecting the cancellation signal, and determine from the quadrant interval for selecting the cancellation signal that satisfies the first The first cancel...

Embodiment 3

[0210] Based on the same inventive concept as the first embodiment of the present application, please refer to Figure 13 , the embodiment of the present application also provides a self-interference signal cancellation system, including:

[0211] The first processing unit 100 is configured to receive a self-interference signal from a transmitter, and map the self-interference signal to an IQ Cartesian vector coordinate system, and determine the quadrant interval where the self-interference signal is located;

[0212] The second processing unit 110, based on the quadrant interval where the self-interference signal is located, determines the quadrant interval for selecting the cancellation signal, and determines that the first preset is satisfied from the quadrant interval for selecting the cancellation signal. a conditional first cancellation signal, and determining a target cancellation area based on the first cancellation signal;

[0213] The third processing unit 120 is co...

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Abstract

The invention discloses a cancellation method and system for a self-interference signal. The method comprises the steps of receiving the self-interference signal from a transmitter, mapping the self-interference signal to an IQ right-angle vector coordinate system and determining a quadrant interval in which the self-interference signal is located; determining the quadrant interval for selecting acancellation signal based on the quadrant interval in which the self-interference signal is located, determining a first cancellation signal satisfying a first preset condition from the quadrant interval for selecting the cancellation signal, and determining a target cancellation area based on the first cancellation signal; traversing the target cancellation area, and determining a second cancellation signal satisfying a second preset condition from the target cancellation area; and combining the self-interference signal and the second cancellation signal, thereby eliminating the self-interference signal. The technical problem that the cancellation method for the self-interference signal employed by an existing RFID (Radio Frequency Identification) system is low in cancellation efficiencyis solved, the complexity of an algorithm is greatly reduced, and the cancellation efficiency is improved.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method and system for canceling self-interference signals. Background technique [0002] Radio Frequency Identification (RFID) is a non-contact automatic identification technology. Its basic principle is to use radio frequency signals and spatial coupling transmission characteristics to automatically identify target objects and obtain relevant information to achieve automatic identification. [0003] Among them, while the reading and writing equipment of the RFID system is receiving radio frequency signals, the transmitter is still continuously emitting radio frequency signals. However, the continuously transmitted radio frequency signals will leak to the receiver. This interference is called self-interference. [0004] For this reason, the amplitude and phase modulation method, the IQ cancellation method and the self-interference signal amplitude and phase detection aux...

Claims

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Application Information

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IPC IPC(8): H04L25/03H04B1/525
CPCH04B1/525H04L25/03821
Inventor 赵棋
Owner ZHEJIANG DAHUA TECH