Backscatter communication method, device and system

A technology of backscattering and communication methods, applied in the field of communication, can solve problems such as performance degradation and interference

Active Publication Date: 2021-09-14
CHINA ACADEMY OF INFORMATION & COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] This application proposes a backscatter communication method, device and system to solve the problem of spectrum shifting of reflected signals in backscatter communication and self-interference of radio frequency signals on backscatter signals serious performance degradation

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  • Backscatter communication method, device and system
  • Backscatter communication method, device and system
  • Backscatter communication method, device and system

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Embodiment Construction

[0031] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with specific embodiments of the present application and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0032] The technical problems to be solved in the present invention specifically include:

[0033] First, the radio frequency signal in the environment seriously interferes with the reflected signal. In the backscatter communication system, the tag realizes data transmission by modulating the RF signal in the environment. The reflected signal and the...

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Abstract

The invention discloses a backscatter communication method, which comprises the following steps of: acquiring a signal bandwidth of a radio frequency signal, and determining that an absolute value of a shift frequency delta f of a backscatter signal is less than 1 / 2 of the bandwidth of the radio frequency signal; using a periodic signal with the frequency of delta f as a reflection coefficient of the tag circuit, so that a radio frequency signal is subjected to frequency shift, and a backscattering signal is generated; and carrying out time synchronization deviation compensation and frequency offset compensation receiving on the backscattering signal, and decoding the backscattering signal. The invention further comprises a device and a system for implementing the method. According to the invention, the problem of serious self-interference of a radio frequency signal on a backscattering signal is solved.

Description

technical field [0001] The present application relates to the technical field of communication, and in particular to a method, device and system for backscatter communication. Background technique [0002] Backscatter (backscatter) communication technology has low cost and low power consumption. It realizes wireless transmission with ultra-low power consumption by modulating the radio frequency signal in the environment. Wireless network solutions. [0003] The existing backscatter communication system is difficult to achieve long-distance transmission. On the one hand, the reflected signal and the RF signal are in the same frequency band, so they are severely interfered by the RF signal; on the other hand, the reflected signal has experienced double path loss, that is, the signal source The path loss between the tag and the tag and the path loss between the tag and the receiver cause the received signal to be very weak. [0004] Although in the long-distance backscatterin...

Claims

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Application Information

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IPC IPC(8): H04L27/00H04L25/02H04L1/00H04B7/22
CPCH04L27/0014H04L25/0224H04L25/0238H04L1/005H04L1/0061H04B7/22H04L2027/0026
Inventor 王志勤宋国超江甲沫韩凯峰闫志宇
Owner CHINA ACADEMY OF INFORMATION & COMM
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