Method for transmitting data from an interrogating device to...

Details Method for transmitting data from an interrogating device to... Method for transmitting data from an interrogating device to...

2005-10-11

2005-10-11

Ghayour, Mohammed (Department: 2631)

Pulse or digital communications

Pulse position, frequency, or spacing modulation

C340S010300

Reexamination Certificate

active

06954496

ABSTRACT:
A method of information transmission from an interrogator system to portable objects. The information is transmitted through ternary amplitude modulation and positional pulse coding. A frame is made up of a Start Of Frame (SOF) marker made up of two like-polarity pulses, patterns that transmit binary symbols and are composed of two opposite-polarity pulses, and lastly an End Of Frame (EOF) marker that is made up only of a single pulse. The present invention is notably intended for interrogating radio frequency (RFID) tags.

REFERENCES:
patent: 4225888 (1980-09-01), Takayama et al.
patent: 5684871 (1997-11-01), Devon et al.
patent: 5844942 (1998-12-01), Hicks et al.
patent: 0 681 192 (1995-11-01), None

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