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

Claim 7:
8. The communication modem of claim 4 wherein:
a center frequency of the spread spectrum transmitter is set by magnitude of the ramp waveform provided to the control input of the spread spectrum transmitter; and
the ramp waveform is provided as an input waveform to the control input of the spread spectrum transmitter to:
vary an instantaneous frequency of a signal at an output of the spread spectrum transmitter to have a center frequency at a beginning, a midpoint and an end of each bit time interval; and
have a maximum frequency, greater than the center frequency, and a minimum frequency, less than the center frequency,
transmit a first data bit having a first binary data value at the minimum frequency and
transmit a second data bit having a second binary data value at the maximum frequency.