Communications: electrical – Systems – Portable self-contained
Patent
1998-11-19
2000-08-08
Horabik, Michael
Communications: electrical
Systems
Portable self-contained
340571, 340572, 342 42, 342 51, G08B 536
Patent
active
061007900
ABSTRACT:
A modulated backscatter communication system (e.g., an Electronic Shelf Label (ESL) system) includes a central node (e.g., a ceiling node) and one or more remote nodes (e.g., ESL tags). The central node transmits a downlink radio signal which is reflectively modulated at a remote node to produce a modulated reflected radio signal. At the remote node, a precise-frequency subcarrier signal is modulated with an uplink information signal to produce a modulated signal which is used to produce the modulated reflected radio signal. At the central node, the modulated reflected radio signal is received, detected and narrowband filtered to obtain the modulated subcarrier signal which is then demodulated to obtain the uplink information signal, with great immunity to close to carrier downlink radio noise and fluorescent light backscatter interference.
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Evans James Gifford
Shober R. Anthony
Vannucci Giovanni
Wilkus Stephen A.
Asongwed Anthony A.
Horabik Michael
NCR Corporation
Priest Peter H.
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