Patent
Method, system and apparatus for calibrating a pulse position modulation (ppm) decoder to a ppm signal
TLDR
In this article, the PPM decoder circuit is calibrated to the difference between the external PPM frequency source and the internal clock-oscillator of the RFID tag device, which is performed in a single measurement during one calibration symbol period.Abstract:
A radio frequency identification (RFID) tag device having a pulse position modulation (PPM) decoder circuit which calculates a relative frequency relationship between an internal oscillator of the RFID tag device and an external PPM source such as a RFID tag reader. The PPM decoder circuit is calibrated to the difference between the external PPM frequency source (i.e., RFID tag reader) and the internal clock-oscillator of the RFID tag device, which is performed in a single measurement during one calibration symbol period.read more
Citations
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Patent
Radio frequency identification architecture
TL;DR: In this article, a radio frequency identification (RFID) architecture is described, where RFID tags are interrogated by a reader, which may be located in a network of readers.
Patent
Mobile RFID reader with integrated location awareness for material tracking and management
Sujeet Chand,Vivek R. Bapat,Kenwood H. Hall,Richard A. Morse,Joseph P. Owen,Arthur P. Pietrzyk,Andreas Somogyi,Kenneth A. Tinnell +7 more
TL;DR: A portable RFID reader (or reader/writer) that also employs a location determination subsystem that facilitates determination of the reader's location can be found in this paper, where the location subsystem can employ a satellite-based GPS (Global Positioning System) location technology where such signals are unimpeded by structures.
Patent
Method, system, and apparatus for remote data calibration of a RFID tag population
TL;DR: In this paper, a method, system, and apparatus for remotely calibrating data symbols received by a radio frequency identification (RFID) tag population are described, where tags are interrogated by a reader, which may be located in a network of readers.
Patent
Method and apparatus for preparing an item with an rfid tag
TL;DR: In this paper, an automated reading system for associating an RFID tag and product information includes a conveyor belt for moving a product having an RIB tag and a bar code.
Patent
Systems and methods that integrate radio frequency identification (RFID) technology with industrial controllers
TL;DR: In this paper, the authors describe systems and methods that provide electronic data (e.g., Electronic Product Code (EPC) data) obtained from Radio Frequency Identification (RFID) tags by RFID readers and/or from servers to one or more industrial components.
References
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Patent
Telemetry system for an implantable medical device
TL;DR: In this paper, a hand shake protocol is used to maintain the link over slight variations in programmer head position with an indicator notifying the operator when repositioning is required, and a cyclic redundancy code is used for link error detection.
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TL;DR: In this paper, the transponder uses energy from the transmitted signal to power itself and send information stored in its memory back to the transceiver in order to identify tools used in an automated machine tool system.
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TL;DR: In this paper, an automatic identification system was proposed where a portable identifier, preferably shaped like a credit card, incorporates an oscillator and encoder so as to generate a programmable pulse position-modulated signal in the radio frequency range for identification of the user.
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Combined OOK-FSK/PPM modulation and communication protocol scheme providing low cost, low power consumption short range radio link
TL;DR: In this article, a communication system provides robust, short range radio communications between battery operated devices by using ON-OFF-KEYED (OOK) modulation and either frequency shift keyed (FSK) modulation or pulse position/width modulation (PPM/PWM) in combination with a prescribed communications protocol.
Patent
Method, system and apparatus for initiating and maintaining synchronization of a pulse position modulation (ppm) decoder with a received ppm signal
Lee Youbok,Lee Furey,William F. Gallagher,Ronald Salesky,Samuel E. Alexander,Inui Shinichiro +5 more
TL;DR: In this paper, a radio frequency identification (RFID) tag device having a pulse position modulation (PPM) decoder circuit calculates a relative frequency relationship between an internal clock-oscillator of the tag device and an external PPM source such as a RFID tag reader.