Method and apparatus for improving wireless data transmission

Details Method and apparatus for improving wireless data transmission Method and apparatus for improving wireless data transmission

2005-03-24

2009-10-27

Zimmerman, Brian A (Department: 2612)

Communications: electrical

Selective

Interrogation response

C340S010100, C340S010500, C340S572100

Reexamination Certificate

active

07609147

ABSTRACT:
A method and apparatus includes at least one transponder or sensor to transmit useful data in an asynchronous mode to at least one reader. Before the start of the useful data transmission, the reader transmits a return link header to the transponder or sensor, which contains at least one bit length reference symbol as a reference time to define the bit length in the return link.

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Draft proposed American National Standard (ANSI T6 standard), 4. Part IV: UHF RFID Protocols that Support Part II, p. 4-1, Fig. 4-1.
ISO/FCD 18000-6, pp. 10 and 17 (Figs. 7-9).

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