Modulated spread spectrum in RF identification systems method

Details Modulated spread spectrum in RF identification systems method Modulated spread spectrum in RF identification systems method

1997-02-13

1999-10-26

Vo, Don N.

Pulse or digital communications

Repeaters

Testing

375221, 340505, H04B 169

Patent

active

059740787

ABSTRACT:
A method for RF communication between transceivers in a radio frequency identification system that improves range, decreases multipath errors and reduces the effect of outside RF source interference by employing spread spectrum techniques. By pulse amplitude modulating a spread spectrum carrier before transmission, the receiver can be designed for simple AM detection, suppressing the spread spectrum carrier and recovering the original data pulse code waveform. The data pulse code waveform has been further encrypted by a direct sequence pseudo-random pulse code. This additional conditioning prevents the original carrier frequency components from appearing in the broadcast power spectra and provides the basis for the clock and transmit carrier of the transceiver aboard an RFID tag. Other advantages include high resolution ranging, hiding transmissions from eavesdroppers, and selective addressing.

REFERENCES:
patent: 4581769 (1986-04-01), Grimsley et al.
patent: 4817113 (1989-03-01), Lundquist et al.
patent: 4839656 (1989-06-01), O'Neill et al.
patent: 4941150 (1990-07-01), Iwasaki
patent: 5036523 (1991-07-01), Briskman
patent: 5099495 (1992-03-01), Mikoshiba et al.
patent: 5103459 (1992-04-01), Gilhousen et al.
patent: 5157408 (1992-10-01), Wagner et al.
patent: 5157688 (1992-10-01), Dell-Imagine
patent: 5170411 (1992-12-01), Ishigaki
patent: 5341396 (1994-08-01), Higgins et al.
patent: 5453748 (1995-09-01), Lindell
patent: 5745037 (1998-04-01), Guthrie et al.
patent: 5796362 (1998-08-01), Ayasli et al.

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