Modulated backscatter wireless communication system having an ex

Details Modulated backscatter wireless communication system having an ex Modulated backscatter wireless communication system having an ex

1997-06-17

1999-02-16

Le, Thanh Cong

Telecommunications

Transmitter and receiver at separate stations

Distortion, noise, or other interference prevention,...

455106, H04B 700

Patent

active

058730257

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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