Patent ID: 11888548
Assignee: MASSACHUSETTS INSTITUTE OF TECHNOLOGY
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 15:
16. A communication modem for implementing a low bitrate sensing and control protocol over a transmission medium, the communication modem comprising:
a spread spectrum transmitter configured to transmit spread spectrum signals having a chirp frequency range extending substantially over a quasi-peak (QP) frequency band, the transmitted spread spectrum signals corresponding to low-bitrate, sensing and control signals; and
a spread spectrum receiver configured to receive spread spectrum signals having a chirp frequency range extending substantially over a quasi-peak (QP) frequency band, the received spread spectrum signals corresponding to low-bitrate, sensing and control signals;
wherein the spread spectrum receiver is configured to recover binary data contained in an output waveform signal received at the spread spectrum receiver by:
(i) frequency-demodulating frequency variations of the received signal;
(ii) integrating the frequency-demodulated signal; and
(iii) comparing the integrated frequency-demodulated signal with a reference level to obtain a binary value of each data bit sent by a spread spectrum transmitter.