ADAPTIVE MODULATER, AND METHOD OF DECIDING ITS MODULATION SYSTEM SWITCHING TIMING

摘要

PROBLEM TO BE SOLVED: To provide an adaptive modulater which switches a modulation system with the throughput of a high-order layer as an index, and to provide a method of deciding its modulation system switching timing.

SOLUTION: The adaptative modulater comprises: a switching timing storage part 113 for storing a relation between a line quality in the layer 1 and the switching timing of the modulation system; a line quality judgment part 106 for judging the line quality at the layer 1; and a modulation system selection part 107 for selecting a modulation method suited to the line quality by referring to the switching timing storage part 113 on the basis of the line quality. A bit error ratio corresponding to the line quality of the respective switching timings is not a fixed value.

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