Method and apparatus for communication in ultra-wide bandwidth rfid systems

A radio frequency identification and ultra-wideband technology, applied in the field of communication, can solve problems such as impossibility, unavailable solutions, and inability to ensure that readers can reliably detect the energy of information, and achieve the effect of eliminating the impact

Inactive Publication Date: 2011-04-13
ALMA MATER STUDIORUM UNIV DI BOLOGNA
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

This phenomenon makes the solution proposed in US 7,154,396 unusable, since the antenna reflects for every load state, thus making it extremely difficult, if not impossible, to identify the reflected pulse as the code of the signal transmitted by the tag
The situation is even worse if, in addition to the signal reflected by the tag's antenna, there are other signal components (clutter) reflected by the surrounding environment or other tags
In addition, considering that international spectrum management constraints do not allow the transmission of UWB signals with a transmit power level greater than -2dBm, associating a bit with each reflected pulse as proposed in US7,154,396 does not guarantee that the reader receives sufficient Energy to reliably detect information at range

Method used

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  • Method and apparatus for communication in ultra-wide bandwidth rfid systems
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  • Method and apparatus for communication in ultra-wide bandwidth rfid systems

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Embodiment Construction

[0032] exist figure 1 The structure of the transceiving device 1 called a reader of the present invention is shown in . The transceiver device 1 includes a sending part 2 and a receiving part 3, which are alternately connected to a first UWB antenna 4 which is an ultra-wideband antenna through a switch 5 . The sending part 2 comprises a first digital sequence or code generator 6, which may be binary c n ∈ {-1, 1}, can also be a ternary c n ∈ {-1, 0, 1}.

[0033] The first digital sequence generator 6 drives the pulse generator 7, and the pulse generator 7 generates a series of pulse trains with a period T s signals, each signal consists of a time interval T f N s consists of equally spaced pulses, so T s =T f *N s . Each pulse making up the pulse train typically has a duration of less than 1 nanosecond, while the pulse polarity depends on the corresponding digit of the digital sequence generated by the first digital sequence generator 6 .

[0034]In order to make the...

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Abstract

A method for communication in ultra-wide bandwidth RFID systems comprising generating through a transceiver device an interrogation signal, composed of at least a sequence of equally time spaced pulses with period (T3), transmitting said signal to at least one RFID identification device which generates a response signal and transmits it back to said transceiver device, said method further comprising coding said interrogation signal according to a numerical coding sequence, generating said response signal by varying, in each period (T3) of said pulse sequence of the interrogation signal, the polarity of pulses using said numerical coding sequence. An apparatus for communication in ultra -wide bandwidth RFID systems comprising a transceiver device (1,101) and a RFID identification device (11), suitable for communicating each other, said RFID identification device (11) comprises a backscatter modulator (12) suitable for modulating a signal reflected by an antenna (18) of the identification device RFID.

Description

technical field [0001] The present invention relates to methods and apparatus for communication within ultra-wideband radio frequency identification (RFID) systems, particularly those employing passive or semi-passive RFID identification devices. [0002] The method and arrangement according to the invention can be used in RFID systems employing passive or semi-passive RFID devices with electromagnetic coupling. Background technique [0003] An RFID system includes a transceiver device called a reader and one or more identification devices called tags, each associated with an object to be identified or located. The reader generates an interrogation signal, which is received by the tag. In response to the received interrogation signal, the tag transmits to the reader a response signal containing specific information, such as the identifier of the object with which the tag is associated. [0004] Tags can be classified into the following three types based on the type of powe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/02G06K7/00G01S7/41H04B1/69
CPCG01S13/756H04B1/719G06K7/0008G01S13/02G06K7/10306G06K19/0723
Inventor D·达达里
Owner ALMA MATER STUDIORUM UNIV DI BOLOGNA
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