SIMULTANEOUS DEMODULATOR FOR PLURAL FDM WAVES

PURPOSE:To make the amplitude of a base band signal of each FDM wave equal by providing a detector detecting the amplitude of the base band signal of each FDM wave between outputs of an A/D converter and a filter bank and using the outputs so as to control the equalizer. CONSTITUTION:FDM waves with...

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Bibliographic Details
Main Author OUE YUJI
Format Patent
LanguageEnglish
Published 16.03.1989
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
MULTIPLEX COMMUNICATION
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Summary:PURPOSE:To make the amplitude of a base band signal of each FDM wave equal by providing a detector detecting the amplitude of the base band signal of each FDM wave between outputs of an A/D converter and a filter bank and using the outputs so as to control the equalizer. CONSTITUTION:FDM waves with N-set of waves having a frequency interval subject to PSK modulation arranged thereto are subject to A/D conversion simultaneously by an A/D converter 11. The converted digital signal is given to a filter bank 13 via an equalizer 12 and divided into n-set of base band signals and the amplitude is detected (15) in time division by a switch 16 and the frequency characteristic of the filter bank 13 is controlled so that outputs bi are all equal to each other. The n-set of outputs are detected by detectors 140-14n-1. Thus, the effect of rounding error by the digital signal processing without incurring the increase in the hardware is reduced.
Bibliography:Application Number: JP19870226680