Modulators – Frequency shift keying modulator or minimum shift keying... – Including logic element
Patent
1997-08-28
1999-08-24
Kinkead, Arnold
Modulators
Frequency shift keying modulator or minimum shift keying...
Including logic element
332100, 375305, H03C 300, H04L 2712
Patent
active
059429550
ABSTRACT:
In order to provide a digital GMSK modulator operating sufficiently stably without aliasing distortion even with a sampling rate of twice of that of input signal, a quasi-GMSK modulator of the invention comprises: integration means (105) for integrating an input signal; filtering means (106, 107) for performing a digital Gaussian filter manipulation of output of the integration means with a low sampling rate of twice or more of a data rate of the output of the integration means; a phase modulator (107, 108 and 111) for obtaining a continuous wave phase-modulated with output of the filtering means; and a limiter (112) for limiting amplitude of the continuous wave within a fixed value.
REFERENCES:
patent: 5022054 (1991-06-01), Wang
Kinkead Arnold
NEC Corporation
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