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

Claim 3:
4. 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 the quasi-peak (QP) frequency band, the received spread spectrum signals corresponding to low-bitrate, sensing and control signals;
wherein the spread spectrum transmitter is configured to transmit binary data by:
defining a bit time interval during which a single bit of data is to be communicated;
converting each data bit to a first signal waveform having a first binary condition in at least one portion of the bit time interval and having the remaining binary condition in other portions of the bit time interval;
integrating the first signal waveform to obtain a ramp waveform; and
providing the ramp waveform to a control input of the spread spectrum transmitter.