Abstract: A communication system sets the data transmission time which is the time suitable for data transmission and the quasi-data transmission time which is the time other than the data transmission time in a period in accordance with the transmission path. Further, bits are assigned and transmitted in such a manner that data for one period can be transmitted during the data transmission period for that period and the data can be uniformly distributed over the data transmission time for the period.

Abstract: In the communication system which performs the data communication by the discrete multi-tone modem scheme between a plurality of data communication units using the time-division half-duplex communication function, the ratio between the data transmission time suitable for data communication and the quasi-data transmission time dynamically changes within one period. Further, bits are assigned in such a manner that the data of one period can be transmitted during the data transmission time of that period. Dummy bits are assigned to the portions of the data transmission time to which the data to be transmitted has not been assigned.

Abstract: A communication system sets the data transmission time which is the time suitable for data transmission and the quasi-data transmission time which is the time other than the data transmission time in a period in accordance with the transmission path. Further, bits are assigned and transmitted in such a manner that data for one period can be transmitted during the data transmission period for that period and the data can be uniformly distributed over the data transmission time for the period.

Abstract: A communication system sets the data transmission time which is the time suitable for data transmission and the quasi-data transmission time which is the time other than the data transmission time in a period in accordance with the transmission path. Further, bits are assigned and transmitted in such a manner that data for one period can be transmitted during the data transmission period for that period and the data can be uniformly distributed over the data transmission time for the period.

Abstract: In the communication system which performs the data communication by the discrete multi-tone modem scheme between a plurality of data communication units using the time-division half-duplex communication function, the ratio between the data transmission time suitable for data communication and the quasi-data transmission time dynamically changes within one period. Further, bits are assigned in such a manner that the data of one period can be transmitted during the data transmission time of that period. Dummy bits are assigned to the portions of the data transmission time to which the data to be transmitted has not been assigned.

Abstract: In the communication system which performs the data communication by the discrete multi-tone modem scheme between a plurality of data communication units using the time-division half-duplex communication function, the ratio between the data transmission time suitable for data communication and the quasi-data transmission time dynamically changes within one period. Further, bits are assigned in such a manner that the data of one period can be transmitted during the data transmission time of that period. Dummy bits are assigned to the portions of the data transmission time to which the data to be transmitted has not been assigned.

Abstract: A relay amplifier provided at a branching point of an electric power line in an electric power line communication for amplifying communication signals, comprising a plurality of signal couplers provided at the respective electric power lines on both sides of the branching point for transmitting/receiving the communication signals to/from the electric power lines; and an amplifier for amplifying the communication signals inputted from the plurality of signal couplers.

Abstract: A radio access line extending device includes: a subscriber outdoor device for communicating with a radio base station by radio; a subscriber media converter for converting communication data which has been received from the radio base station by the subscriber outdoor device into converted media and to outputting the converted media to a subscriber indoor electric lamp wire; and a subscriber router that receives the communication data which is transmitted through the subscriber indoor electric lamp wire, and outputs the communication data to a subscriber personal computer. The subscriber outdoor device and the subscriber media converter are connected to each other through a cable, and the cable is drawn into a subscriber's home through a hole for a drain pipe of an air conditioner.

Abstract: In the communication system which performs the data communication by the discrete multi-tone modem scheme between a plurality of data communication units using the time-division half-duplex communication function, the ratio between the data transmission time suitable for data communication and the quasi-data transmission time dynamically changes within one period. Further, bits are assigned in such a manner that the data of one period can be transmitted during the data transmission time of that period. Dummy bits are assigned to the portions of the data transmission time to which the data to be transmitted has not been assigned.

Abstract: In the communication system which performs the data communication by the discrete multi-tone modem scheme between a plurality of data communication units using the time-division half-duplex communication function, the ratio between the data transmission time suitable for data communication and the quasi-data transmission time dynamically changes within one period. Further, bits are assigned in such a manner that the data of one period can be transmitted during the data transmission time of that period. Dummy bits are assigned to the portions of the data transmission time to which the data to be transmitted has not been assigned.

Abstract: A grouping apparatus of communication devices for use in a communication system, in which a plurality of communication devices are connected respectively via a communication medium and capable of communicating with each other, includes a sequence determination section that detects a time sequence of inputs to an input section for generating a participation request signal from one's and the other communication devices. Constitution of a secure group between one's communication device and the other communication devices is implemented when a time sequence of inputs to the input section of one's and the other communication devices meets a predetermined specific rule. In this manner, grouping of a plurality of specific communication devices can be carried out easily and safely.

Abstract: The communication apparatus comprises a turbo encoder. This turbo encoder includes a first recursive systematic convolutional encoder which convolutionally encodes two information bit sequences to output first redundant data, and a second recursive systematic convolutional encoder which convolutionally encodes the information bit sequences subjected to an interleave process to output second redundant data. The first and second recursive systematic convolutional encoders are encoders which search all connection patterns constituting the encoders and which satisfy optimum conditions that an interval between two bits ‘1’ of a self-terminated pattern is maximum in a specific block length and that a total weight in the pattern having the maximum interval is maximum in the specific block length.

Abstract: All mutual interference occurring between TCM-ISDN and ADSL that communicate by utilizing a line having the same properties and using the same reference signal, and all mutual interference occurring between ADSLs are rejected, by delaying the TTR in the own ATU-C by S1 and approximately adjusting the TTR transmitted to the ATU-R which is a device to be communicated by S2.