发明名称 |
TDMA network and protocol for reader-transponder communications and method |
摘要 |
A TDMA network for reader-transponder communications including a receiver having an antenna for receiving and transforming radiated energy to a first RF signal and a detector for demodulating and converting the first RF signal to a digital signal. A protocol logic device is provided for decoding the digital signal and for executing a protocol. The protocol comprises a plurality of randomly selected time slots to gain admission to the TDMA network and a plurality of assigned time slots to transmit messages during the reader-transponder communications. In a transponder implementation, an oscillator is provided for converting protocol formatted digital signals from the logic device to a second RF signal. Thereafter, the antenna transforms the second RF signal to radiated energy and transmits the radiated energy. In a preferred embodiment, the TDMA network includes a transmit/receive switch for directing the first and second RF signals along the receive and transmit paths, respectively. A digital memory which communicates with the protocol logic device is provided for storing data unique to a transponder. The protocol also includes a reader control message time slot for interrogating the transponder and an acknowledgment time slot for indicating the reception of a message.
|
申请公布号 |
US5425032(A) |
申请公布日期 |
1995.06.13 |
申请号 |
US19940194674 |
申请日期 |
1994.02.10 |
申请人 |
HUGHES AIRCRAFT COMPANY |
发明人 |
SHLOSS, PETER D.;FRIEDMAN, MICHAEL S.;FEIKEMA, DALE R. |
分类号 |
H04Q7/38;H04B7/26;H04J3/00;(IPC1-7):H04J3/16;H04B7/212 |
主分类号 |
H04Q7/38 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|