Telecommunications – Transmitter and receiver at separate stations – Frequency or phase modulation
Patent
1995-07-17
1997-06-17
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
Frequency or phase modulation
455 63, 455 73, 455106, H04B 700
Patent
active
056406835
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.
Caccuro John A.
Eisenzopf Reinhard J.
Le Thanh
Luludis Frederick B.
NCR Corporation
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