Direct 2nd derivative synthesis method for controlling sidelobe

Details Direct 2nd derivative synthesis method for controlling sidelobe Direct 2nd derivative synthesis method for controlling sidelobe

1997-10-06

1998-11-10

Mis, David

Modulators

Frequency shift keying modulator or minimum shift keying...

375274, 375305, H03C 300, H04L 2712

Patent

active

058349863

ABSTRACT:
A method for generating minimum shift keying (MSK) modulation signals with relatively reduced energy sidelobes relative to known methods. In one embodiment, a second derivative of the phase waveform is taken and convolved with a selectable smoothing function and integrated twice to generate a smooth phase waveform S2D.sub.-- MSK (i)=where .o slashed. (i)=.pi. i d(i)/2T. In the alternate embodiment, the sidelobe energy can be varied by simply changing the smoothing function, which can be stored in a lookup table. In the embodiment, the MSK modulation signal has a constant amplitude envelope allowing it to be transmitted using class C amplifiers. Since the embodiment provides continuous phase derivatives, the frequency and thus the sidelobe energy is sufficiently reduced to minimize interference with cosite equipment and nearby communication channels bands.

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Amoroso, Frank, "The Use of Quasi-Bandlimited Pulses in MSK Transmission," Oct. 10, 1979, pp. 1616-1623, IEEE Transactions on Communications.
Amoroso, Frank, "Pulse and Spectrum Manipulation in the Mimimum (Frequency) Shift Keying (MSK) Format," Mar. 1996, pp. 381-384, IEEE Transactions on Communications.

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