Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1982-04-12
1985-05-07
LaRoche, Eugene R.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
332 23A, 375 42, 375 47, H03C 300
Patent
active
045160872
ABSTRACT:
A method and apparatus for generating an MSK detectable signal with reduced side lobe energy of the type in which the MSK detectable signal has two combined orthogonal channels to transmit a data signal. A predetermined channel envelope modulation waveform pattern is selected in accordance with a group of data bits, and the respective orthogonal channels are amplitude modulated with the selected predetermined waveforms. The addition of the orthogonal channels results in a constant amplitude signal with greatly reduced energy in the higher order sidelobes.
REFERENCES:
patent: 4135057 (1979-01-01), Bayless, Sr. et al.
DeJager, F., "Tamed Frequency Modulation, A Novel Method To Achieve Spectrum Economy In Digital Transmission", IEEE Transactions on Communications, v. COM-26, No. 5, pp. 534-542, May 1978.
Asakawa, S. et al, "A Compact Spectrum Constant Envelope Digital Phase Modulation", IEEE Transactions On Vehicular Technology, v. VT-30, No. 3, pp. 102-111, Aug. 1981.
Nakajima, S. et al, "Gaussian Filtered and Amplitude Limited MSK", Transactions of the IECE of Japan, v. E-64, No. 11, pp. 716-723, Nov. 1981.
Bachand Richard A.
Hamann H. Fredrick
LaRoche Eugene R.
Pascal Robert J.
Rockwell International Corporation
LandOfFree
Method for reducing side-lobe energy in an MSK detectable signal does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for reducing side-lobe energy in an MSK detectable signal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for reducing side-lobe energy in an MSK detectable signal will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1802614