Dual mode modulated backscatter system

Details Dual mode modulated backscatter system Dual mode modulated backscatter system

1995-06-19

1997-07-15

Pham, Chi H.

Telecommunications

Transmitter and receiver at separate stations

455 73, 455106, 455517, 342 51, H04B 140, H04B 159

Patent

active

056492952

ABSTRACT:
A radio communication system includes an Interrogator for generating and transmitting a first modulated signal by modulating a first information signal onto a radio carrier signal, the first information signal indicating in which of multiple response modes a receiving Tag should respond. One or more Tags of the system receive the first modulated signal and decode it to obtain the first information signal. A Backscatter Modulator modulates the reflection of the first modulated signal using a second information signal whose content, data rate, or modulation is determined by said first information signal, thereby forming a second modulated signal. The Interrogator receives and demodulates the second modulated signal to obtain the indicated second information signal.

REFERENCES:
patent: 2259227 (1941-08-01), Pescod
patent: 4075632 (1978-02-01), Baldwin et al.
patent: 4360810 (1982-11-01), Landt
patent: 5252979 (1993-10-01), Nysen
patent: 5317309 (1994-05-01), Vercellotti et al.
patent: 5319802 (1994-06-01), Camiade et al.

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