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Signal receiving method for backscatter communication system

A technology of backscattering and communication systems, applied in the near-field transmission system, transmission system, near-field transmission system and other directions in the radio frequency identification system, can solve the problems of high consumption and low energy efficiency, and achieve the goal of improving energy efficiency and reducing energy consumption. Effect

Active Publication Date: 2017-03-29
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0003] In order to solve the problems of high consumption and low energy efficiency of the traditional backscatter communication system, the present invention proposes an environmental backscatter communication technology using the radio frequency signal in the surrounding environment as a carrier, and proposes an airborne Modulation Technology Reception Method

Method used

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  • Signal receiving method for backscatter communication system
  • Signal receiving method for backscatter communication system
  • Signal receiving method for backscatter communication system

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Embodiment Construction

[0043] Below in conjunction with accompanying drawing and embodiment, describe technical solution of the present invention in detail:

[0044] The present invention considers that the receiver receives both the radio frequency source signal and the tag signal, and demodulates the two. This kind of receiver is called a joint receiver. System model such as figure 2 As shown, the radio frequency source and the tag are deployed with a single antenna, and the joint receiver is deployed with M (M≥1) antennas. The joint receiver receives the signal of the radio frequency source and the backscattered signal of the tag, and the received signal is,

[0045]

[0046] Among them, y m (n) refers to the signal received by the mth antenna, s(n) refers to the RF source signal, c(n) refers to the signal to be sent by the tag, P s Refers to the power of the RF source signal, f m is the channel attenuation coefficient of the mth antenna of the radio frequency source and the joint receiver...

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Abstract

The invention belongs to the technical field of wireless communications, and relates to a signal receiving method for a backscatter communication system. The signal receiving method provided by the invention is used for a traditional system with a communication system and an environment backscatter communication system coexisted, and detecting signals sent by the two systems at a joint receiver. A signal transmitted to the joint receiver by a label is modulated by taking a signal from a radio frequency source as a carrier wave; the label comprises one backscatter antenna; the antenna is connected with a load impedance switch and a radio frequency energy collection module; and the radio frequency energy collection module can collect energy from environmental signals. In order to transmit information bits to a reader through backscatter modulation, the label switches an antenna impedance switch, so as to change the amplitude and / or phase of backscattered signals to modulate received carrier signals, and finally, the backscattered signals are received and decoded by the joint receiver.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a signal receiving method for a backscatter communication system. Background technique [0002] Traditional backscatter communication systems, such as radio frequency identification (RFID) systems, generate and send radio frequency sinusoidal carrier waves to adjacent tags (Tags) through the reader (Reader) and carry tag information back to the reader. Tag circuits are usually simple and passive, so their processing capabilities are limited. Such as figure 1 As shown, the RFID reader sends a sinusoidal carrier wave to the tag. Part of the signal received by the tag is used for energy harvesting to meet the normal operation of the tag circuit, and the other part is used for backscattering to transmit the tag information to the reader. Since the reader needs to generate a dedicated radio frequency sinusoidal carrier, this traditional backscatter communi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B5/00G06K7/10
CPCG06K7/10009H04B5/77H04B5/72
Inventor 梁应敞杨刚张倩倩
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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