US 11,888,548 B2
Power line communication for low-bandwidth control and sensing
Steven B. Leeb, Belmont, MA (US); Leslie K. Norford, Lexington, MA (US); Erik K. Saathoff, Cambridge, MA (US); Adedayo O. Aderibole, Cambridge, MA (US); and Kevin Kircher, Cambridge, MA (US)
Assigned to Massachusetts Institute of Technology, Cambridge, MA (US)
Filed by Massachusetts Institute of Technology, Cambridge, MA (US)
Filed on May 26, 2022, as Appl. No. 17/804,165.
Claims priority of provisional application 63/194,562, filed on May 28, 2021.
Prior Publication US 2022/0385335 A1, Dec. 1, 2022
Int. Cl. H04B 3/56 (2006.01); H04B 1/69 (2011.01); H04L 27/10 (2006.01)
CPC H04B 3/56 (2013.01) [H04B 1/69 (2013.01); H04L 27/10 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A communication system comprising:
(a) a device;
(b) a transmission medium; and
(c) a modem coupled between the device and the transmission medium, the modem configured to:
(c1) receive signals from the device and modulate the received signals for transmission over the transmission medium with a spread spectrum chirp transmitter as modulated spread spectrum chirp signals, transmit the modulated spread spectrum chirp signals as binary data by: (a) defining a bit time interval during which a single bit of data is to be communicated; (b) 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; (c) integrating the first signal waveform to obtain a ramp waveform; and (d) providing the ramp waveform to a control input of a spread spectrum transmitter;
(c2) receive modulated spread spectrum chirp signals propagating on the transmission medium, demodulate the received modulated spread spectrum chirp signals and provide demodulated spread spectrum chirp signals to the device; and
(c3) meet quasi-peak (QP) signal levels.