CALCULATING INTERMODULATION PRODUCTS BY REPRESENTING CONTIGUOUS NARROW BAND CARRIES AS BANDPASS NOISE / CÁLCULO DE INTERMODULAÇÃO ATRAVÉS DA REPRESENTAÇÃO DE PORTADORAS DE FAIXA ESTREITA CONTIGUAS POR UMA BANDA DE RUÍDO

AUTOR(ES)
DATA DE PUBLICAÇÃO

1986

RESUMO

Replacing several contiguous SCPC/ FM carriers by na equivalent band of thermal noise does not lead to the exact intermodulation power spectral density at the output of a nonlinear amplifier. However, this work shows that an appropriate use of the results following from this approach can still lead to a solution for the problem of evaluating intermodulation impairments, since a precise computation of the RF intermodulation power inside the frequency bandwidth of any carrier is indeed performed. Furthermore, if the spectrum shape is taken into account the baseband noise can be found in a proper way. A computer program using this technique for transponders accessed by SCPC/ FM carriers of different levels has been developed. In order to validate the proposed procedure, comparisons have been performed with the results based on another recently developed technique, involving a fast algorithm for counting intermodulation products. Replacing contiguous narrow-band carriers by thermal noise is also useful when carriers with different normalized power spectral densities are accessing the transponder.

ASSUNTO(S)

intermodulation products produtos de intermodulacao

ACESSO AO ARTIGO

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