Constant envelope continuous phase frequency shift key modulatio

Details Constant envelope continuous phase frequency shift key modulatio Constant envelope continuous phase frequency shift key modulatio

1996-07-16

1998-09-22

Bocure, Tesfadet

Pulse or digital communications

Transmitters

Angle modulation

332103, H04L 2720

Patent

active

058126040

ABSTRACT:
Constant envelope angle modulation apparatus comprises a frequency synthesizer for outputting a stepped output waveform having a selectable precise output frequency. The output of the synthesizer provides an input to a mixer for O-QPSK modulating a received information signal. The O-QPSK modulated signal is then hard-limited, for example, via a series of hard limiting amplifier and filter circuits and a divider circuit. Preferably, a data stream for modulation may be filtered via a filter having an approximately 70-100% roll-off characteristic, such as a root raised cosine filter. A hard-limited, constant envelope angle modulated signal results that is easily frequency converted to, for example, microwave frequencies for landline or satellite applications via a simple multiplier circuit. The multiplier circuit preferably comprises a series of stage-filtered multipliers and band pass filters to achieve the desired output microwave frequency.

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