Discrete multi-tone communication system, the data communication device and discrete multi-tone communication method

摘要

PROBLEM TO BE SOLVED: To efficiently use a carrier of the DMT modulation and demodulation system and to allows data communication devices to communicate at the same time. ;SOLUTION: The carrier of the DMT modulation and demodulation system is divided by data communication devices 2b1 to 2bk of a subscriber-side system B and assigned. For example, four subcarriers of ch10 to CH13 are assigned to the data communication device 2b1, four subcarriers of following ch14 to CH17 are assigned to the data communication device 2b2, four subcarriers of following ch18 to CH21 are assigned to the data communication device 4b4, and so on. Consequently, the data communication devices 2b1 to 2bk are able to receive data from a data communication network N2, etc., from a telephone station side system A through ADSL.lite modems 3b1 to 3bk and one telephone line C.;COPYRIGHT: (C)1999,JPO