Air interface uplink channel for shift m sequence spread spectrum radio frequency identification device (RFID)

A technology of spread spectrum and air interface, which is applied in the direction of instruments, electrical components, transmission systems, etc., and can solve the problems of failing to take advantage of m-sequence technology

Active Publication Date: 2011-01-26
刘礼白
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The technical advantages of m-sequence application i

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  • Air interface uplink channel for shift m sequence spread spectrum radio frequency identification device (RFID)
  • Air interface uplink channel for shift m sequence spread spectrum radio frequency identification device (RFID)
  • Air interface uplink channel for shift m sequence spread spectrum radio frequency identification device (RFID)

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Embodiment Construction

[0024] 1. Passive tag RFID air interface

[0025] Passive tag RFID air interface reverse channel. Adopt spread spectrum design. The tag receives the carrier wave sent by the reader, adds the data to be sent to the selected shift m sequence modulo 2, modulates the carrier wave sent by the reader to form a spread spectrum return signal, and sends it back for reading and writing. device. The main body of the reader-writer receiving unit despreads the received spread spectrum signal by an asynchronous correlator to complete correlation reception. Since it is asynchronous correlation reception, it simplifies synchronous capture and is suitable for the characteristics of RFID instantaneous burst signal reception.

[0026] 2. Active tag RFID air interface

[0027] The active tag RFID air interface consists of a reader and an active tag. Including forward and reverse channels, the forward channel is sent by the reader and received by the tag. Different from the passive tag RFID a...

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PUM

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Abstract

The invention relates to an air interface uplink channel for a shift m sequence spread spectrum radio frequency identification device (RFID), which belongs to the field of short-haul communication and relates to RFID technology and is related with an ultra-short wave, a microwave RFID system and a device design. A passive tag RFID uplink channel is provided with an orthogonal shift m sequence spread spectrum uplink channel. The original polynomial of a shift m sequence family is selectable and an application sequence in an orthogonal shift m sequence family is selectable. The minimum shift amount is 1 chip. The design chip width of the system is far more than the transmission delay from a reader-writer to a tag. In the invention, RFID uplink and downlink channels of an active tag are provided with shift m sequence spread spectrums. Binary phase shift keying (BPSK) modulation is selected and the reader-writer adopts relevant de-spreading of an asynchronous correlator of the selectable sequence. The invention discloses a method for establishing a carrier leakage counteraction design with the characteristics of amplitude and a phase control ring at the front end of the reader-writer and arranging a carrier leakage indicating circuit in a reader-writer receiver.

Description

technical field [0001] The invention belongs to the field of short-range communication and radio frequency identification (RFID) technology. Related to very high frequency (VHF), ultra high frequency (UHF), microwave (MW) frequency band RFID air interface system and equipment design. Background technique [0002] Short-range communication is one of the new technical fields that have been extremely active in recent years. Among them, wireless sensor network (WSN) and radio frequency identification (RFID) technologies are particularly prominent and have great industrial prospects. Both WSN and RFID belong to short-range communication, so there are some commonalities in technology. [0003] The development process of radio frequency identification (RFID) air interface technology is the process of increasing the carrier frequency from low frequency to high frequency, and then to UHF and microwave. Application development process. The most representative technical specificati...

Claims

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Application Information

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IPC IPC(8): G06K17/00H04B1/707H04B1/52H04B1/525
Inventor 刘礼白
Owner 刘礼白
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