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Backscatter interrogator reception method and interrogator for a modulated backscatter system

A technology of backscattering and receiving methods, applied in the direction of modulated carrier system, transmission system, digital transmission system, etc., which can solve the problems of reducing the performance of the interrogator receiver 102 and reducing the usable range of the modulated backscattering system

Inactive Publication Date: 2006-03-01
SONY DEUT GMBH
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Problems solved by technology

As a result, the performance of the interrogator receiver 102 is reduced and the usable range of the modulated backscatter system is reduced

Method used

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  • Backscatter interrogator reception method and interrogator for a modulated backscatter system
  • Backscatter interrogator reception method and interrogator for a modulated backscatter system
  • Backscatter interrogator reception method and interrogator for a modulated backscatter system

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Embodiment Construction

[0045] Seen figure 1 The principle of modulated backscatter communication is explained. In order to modulate the signal P1 transmitted by the interrogator 100, the load impedance of the antenna 111 of the tag 110 is changed between values, for example, representing the data signal "1" and "0". From the perspective of interrogator 100, the amplitude (and / or phase) of the interrogating radio frequency waveform reflected by tag 110 toggles between these two values. When the switch is on, antenna 111 is electrically equivalent to a single half-wavelength antenna, reflecting some power; when the switch is off, antenna 111 is electrically equivalent to two quarter-wavelength antennas, reflecting very little power. This effect corresponds to amplitude shift keying (ASK) modulation with a small modulation depth.

[0046]The modulated reflected signal P2 is called the MBS signal, which is received by the interrogator 100 together with a strong in-band jamming signal. In order to red...

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Abstract

In a backscatter interrogator reception method, a continuous carrier signal (P1) with a frequency fc is sent from an interrogator (100) to a tag device (110) over a wireless link, the tag device (110) transmits data to the interrogator (100) using a modulated backscatter (P2) signal, and the received modulated backscatter signal (P2) is demodulated by the interrogator (100) to retrieve the data transmitted from the tag device (110). According to the present invention, the interrogator (100) estimates the phase and the amplitude of an inband interferer signal contained in the received modulated backscatter signal (P2), generates a cancellation signal having the opposite phase and the same amplitude as the estimation of the inband interferer signal, and combines said cancellation signal with the received backscatter signal (P2) in order to reduce the influence of the inband interferer signal. In addition, a two-stage interferer cancellation scheme is proposed.

Description

technical field [0001] The invention relates to a receiving method for a backscatter interrogator and an interrogator for a modulated backscatter system (MBS). Background technique [0002] The modulated backscatter system (MBS) is well known in the art and is the basis for the recently developed so-called radio frequency identification (RFID) system. These RFID systems are used, for example, to identify and / or track equipment, inventory, people or animals. RFID systems are radio communication systems that allow communication between a radio transceiver (called an interrogator) and at least one so-called tag. In an RFID system an interrogator and a tag communicate by the interrogator transmitting an unmodulated radio signal, which the tag receives, modulates, and sends back to the interrogator. [0003] figure 1 The general concept underlying the modulated backscatter system is shown in . Similar to the field of radar technology, backscatter communication is based on the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00G06K7/08G06K7/00H04B1/52H04B5/48
CPCG06K7/0008H04B1/525
Inventor Z·王R·贝恩克J·雷布曼
Owner SONY DEUT GMBH
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