05940006 is referenced by 206 patents and cites 7 patents.

A Time Division Multiple Access (TDMA) duplex radio communication system uses an Interrogator to generate a first radio signal by modulating a first information signal onto a radio carrier signal which is sent to at least one remote Tag of the system. The remote Tag receives and modulates a second information signal onto a second radio carrier signal to form a second modulated signal which is transmitted, in a time-slotted manner, back to the Interrogator. The remote Tag selects, or is instructed, how many times it should repetitively transmit the second modulated signal; and selects, or is instructed, over how many of the time slots following receipt of the first radio signal the remote Tag should repetitively transmit the second modulated signal. Other embodiments use Modulated Backscatter to transmit the second modulated signal, and use homodyne detection to demodulate the second modulated signal. A Frequency Division Multiple Access (FDMA) duplex radio communication system embodiment utilizes multiple subcarrier frequencies and another embodiment combines the FDMA and the TDMA methods. A Code Division Multiple Access (CDMA) embodiment utilizes multiple spreading codes and another embodiment combines the CDMA and the TDMA methods.

Title
Enhanced uplink modulated backscatter system
Application Number
8/571004
Publication Number
5940006
Application Date
December 12, 1995
Publication Date
August 17, 1999
Inventor
Giovanni Vannucci
Middletown Township
NJ, US
R Anthony Shober
Red Bank
NJ, US
John Austin MacLellan
Aberdeen
NJ, US
Assignee
Lucent Technologies
NJ, US
IPC
H04J 3/00
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