SISTEMAS DE MODULAÇÃO EM ÂNGULO-DEMODULADORES COM EXTENSÃO DE LIMIAR / ANGLE MODULATED SYSTEMS-DEMODULATORS WITH THRESHOLD EXTENSION

AUTOR(ES)

RUI LUIZ GOMES DA SILVA

DATA DE PUBLICAÇÃO

1976

RESUMO

Angle modulation systems are analysed. Corresponding theoretical results are to experimental results and usual procedures connected to these systems. Power spectral density of a multiplex signal angle modulated carrier is compared to usual approximations, which shoe to be rather satisfactory. Still for a multiplex signal as modulating signal threshold improvement introduced by a PLL demodulador is analysed. Theoretical bounds on this improvement are compared to experimental values. For a multiplex modulating signal an optimal pre-emphasis filter is computed, under a bandwidth constraint. This filter is reasonably similar to the one recommended by CCIR.

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