Systems and methods for reducing interference by modulating...

Communications: electrical – Selective – Interrogation response

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C340S010300, C340S010400

Reexamination Certificate

active

07321289

ABSTRACT:
Systems and methods for reducing interference by warbling a reader transmitted signal are described. To reduce interference in a densely packed multiple reader environment, a reader modulates or warbles the frequency or phase of the transmitted signal during a reception portion of a symbol exchange period. The transmitted signal is modulated within the bandwidth of an operating channel. The bandwidth of the operating channel is much narrower than the system bandwidth. In frequency warbling, the carrier frequency is shifted one or more times during the reception portion of the symbol exchange period. If phase warbling, the transmitted signal is spread within bandwidth of the operating channel during the reception portion of the symbol exchange period.

REFERENCES:
patent: 4703327 (1987-10-01), Rossetti et al.
patent: 5124699 (1992-06-01), Tervoert et al.
patent: 5349332 (1994-09-01), Ferguson et al.
patent: 5497140 (1996-03-01), Tuttle
patent: 5519181 (1996-05-01), Hsu
patent: 5828693 (1998-10-01), Mays et al.
patent: 5850181 (1998-12-01), Heinrich et al.
patent: 6108367 (2000-08-01), Herman et al.
patent: 6429775 (2002-08-01), Martinez et al.
patent: 6531957 (2003-03-01), Nysen
patent: 2002/0174153 (2002-11-01), O'Toole et al.
patent: 2005/0099270 (2005-05-01), Diorio et al.
patent: 2005/0123061 (2005-06-01), Smith et al.
patent: WO 97/07413 (1997-02-01), None
International Search Report cited in Application No. PCT/US 06/25323 dated Dec. 4, 2006.
Tuttle, John R., “A Low-Power Spread Spectrum CMOS RFIC For Radio Identification Applications”,RF Expo West, Mar. 22-24, 1994, pp. 216-222.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Systems and methods for reducing interference by modulating... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Systems and methods for reducing interference by modulating..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Systems and methods for reducing interference by modulating... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2807437

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.