Patent ID: 7212552

Claim:
A communication system which performs data communication by a discrete multi-tone modem scheme between a plurality of data communication units using a time-division half-duplex communication function, comprising: a setting unit configured to set a data transmission time and a quasi-data transmission time within each cycle of a periodic timing, the data transmission time being better suited for data transmission with respect to interference noise than the quasi-data transmission time, wherein the ratio between the data transmission time and the quasi-data transmission time within each cycle of the periodic timing is set dynamically; and an assigning unit configured to: obtain bits of data according to a uniform data rate, assign the uniformly obtained bits of data for transmission according to the periodic timing in such a manner that the data bits uniformly obtained during a given period equivalent to the cycle time of the periodic timing are transmitted during the data transmission time of one cycle of the periodic timing, and assign dummy bits to the portion of the data transmission time of the one cycle to which no data bits have been assigned.