Complex condition determining unit, transmission equipment, complex condition determination method

摘要

In order to solve the problem of allowing the change of the modulation scheme to adapt to rapidly changing line conditions, the composite condition determination unit, integrated with the time period accumulating a predetermined number of error pulses indicating the presence or absence of error in the received signal CNR and a predetermined error pulse switching determination means for outputting as an error pulse determining information, information indicating whether a value is an error pulse a predetermined threshold value or more, CNR and information indicating CNR of the received signal (carrier power-to-signal power ratio) the modulation scheme is determined on the basis of the RSL predetermined threshold CNR and the modulation scheme decision means for outputting as the CNR determination information modulation scheme is determined based on the threshold, the RSL information indicating RSL of the received signal (received signal level) and RSL modulation scheme decision means for outputting as an RSL determination information, the received modulation scheme information indicating the modulation scheme of the received signal, the error pulse determination information, and CNR determination information, and RSL judgment information, based on the transmission of the received signal I provided, and a complex modulation scheme determining means for determining a modulation scheme that original used for modulation.