Abstract: In an angle modulated radio transmitter, the total power is the same when modulated or unmodulated. Angle modulation produces multiple sideband pairs. The power in the sidebands is derived from the carrier. When a complex modulating waveform is used, the power (and therefore the amplitude) of the carrier varies. A system and method is provided for dramatically minimizing, to nearly zero, the bandwidth needed to transmit digital information using sideband suppression of angle modulated signals. The systems described use various techniques to suppress sideband pairs, leaving the carrier signal. The amplitude variations of the carrier are used to convey information. In some examples, techniques are used to filter and/or phase out one or more sideband pairs, leaving the carrier signal.

Abstract: In an angle modulated radio transmitter, the total power is the same when modulated or unmodulated. Angle modulation produces multiple sideband pairs. The power in the sidebands is derived from the carrier. When a complex modulating waveform is used, the power (and therefore the amplitude) of the carrier varies. A system and method is provided for dramatically minimizing, to nearly zero, the bandwidth needed to transmit digital information using sideband suppression of angle modulated signals. The systems described use various techniques to suppress sideband pairs, leaving the carrier signal. The amplitude variations of the carrier are used to convey information. In some examples, techniques are used to filter and/or phase out one or more sideband pairs, leaving the carrier signal.

Abstract: A method for transmitting information on electromagnetic waves that requires less bandwidth than other common modes. The information is divided into two parts in the manner of the Weaver method of single sideband generation. These two parts each have one-half the bandwidth of the original information. The two parts are modulated on separate transmitters operating on the same frequency. The signals are kept separate through the use of circular polarized antennas. The received signals are demodulated and then recombined in a circuit identical to the one that divided them in the transmitter. The recombined signal is the same as the original information. The bandwidth used in the electromagnetic spectrum is one-half that of the information.