Abstract:
PROBLEM TO BE SOLVED: To provide a power-line communication method, a power-line communication device, and a power-line communication system, which can make communication carry out at high communication efficiency, even if the conditions of a power line are changed. SOLUTION: In step S101, noise condition is detected in correspondence to a time domain synchronized with a power source cycle of a power line. In step S102, a communication channel generation process for generating communication channels in the time domain is performed, on the basis of the noise condition detected in step S101. In step S103, tone maps are prepared for the communication channels generated in step S102. When the preparation of the tone maps is ended, the tone maps are transmitted to a destination PLC, and data are transmitted and received between a transmission-side PLC and a reception-side PLC by the use of the same tone map (step S104). COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a power line communication apparatus and a power line communication method, with which the state of a transmission line can be recognized visually. SOLUTION: A power line communication apparatus 100 is provided with a gain fluctuation detecting section 106 for detecting the gain fluctuations of an AGC circuit 105 for automatically adjusting the gain of a reception signal; a retransmission rate measuring section 114 for measuring a retransmission rate, on the basis of an output of an ARQ section 113 for detecting an error of reception data and requesting retransmission; and a communication speed calculating section 116 for calculating the communication speed, on the basis of an output of a transmission path estimating device 115 for measuring CNR to estimate the transmission path state. A display section 117 displays the communication state, such as the detected noise fluctuation of the AGC, the retransmission rate and the communication speed. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To keep error correction capability intact and keep information transmission efficiency intact even in the event of termination in an encoder and a decoder using LDPC-CC.SOLUTION: A termination sequence length decision section 631 decides a sequence length of a termination sequence to be added for transmission to a tail end of an information sequence in accordance with an information length (information size) of the information sequence and a coding rate, and a parity calculation section 632 performs LDPC-CC coding on the information sequence and a known information sequence necessary to generate the termination sequence of the determined termination sequence length to calculate a parity sequence.
Abstract:
PROBLEM TO BE SOLVED: To prevent the degradation of error correction capability and evade the decline of information transmission efficiency even when performing termination in an encoder and a decoder using LDPC-CC.SOLUTION: A termination sequence length determination part 631 determines a sequence length of a termination sequence to be added to a rear end of an information sequence and transmitted corresponding to the information length (information size) of the information sequence and an encoding rate. A parity calculation part 632 applies LDPC-CC encoding to the information sequence and a known information sequence required for generating the termination sequence for the determined termination sequence length and calculates a parity sequence.
Abstract:
PROBLEM TO BE SOLVED: To discriminate a version of a packet or the like by preamble of the packet, and to change specifications by the version or the like including a part in which control information of the packet is stored. SOLUTION: The communication apparatus has a phase vector setter 15 which gives a phase vector by rotating a phase of a signal in each subcarrier using a specific phase vector regarding transmitted data corresponding to each subcarrier of a multi-carrier signal in a transmitter 10, and sets a phase vector different by the version of the packet, etc. as preamble. The communication apparatus has a phase vector restoration unit 25 which performs reverse rotation of the phase of the signal in each subcarrier of the multi-carrier signal to restore the phase vector in a receiver 20, performs carrier detection using a specific phase vector, discriminates the version of the packet, etc. by a class of a phase vector whose detection is successful, and performs reception processing according to the version, etc. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a communication apparatus that uses a DWMC transmission method that is capable of processing complex information. SOLUTION: A detection portion 101 of a receiving device includes: a first wavelet transformer 102; a Hilbert transformer 103 for applying Hilbert transform to received waveform data; a second wavelet transformer 104 for applying wavelet transform to an output from the Hilbert transformer 103; a sign converter 105 for inverting the sign of an odd-numbered output of M outputs from the second wavelet transformer 104; a level converter 106 for correcting an amplitude fluctuation in an output from the sign converter 105 due to a ripple in the Hilbert transformer 103; and a complex data generator 107 for generating complex data by using an output from the first wavelet transformer 102 as an in-phase component of complex information and an output from the level converter 106 as a quadrature component. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To prevent the degradation of error correction capability and evade the decline of information transmission efficiency even when performing termination in an encoder and a decoder using LDPC-CC.SOLUTION: A termination sequence length determination part 631 determines a sequence length of a termination sequence to be added to a rear end of an information sequence and transmitted corresponding to the information length (information size) of the information sequence and an encoding rate. A parity calculation part 632 applies LDPC-CC encoding to the information sequence and a known information sequence required for generating the termination sequence for the determined termination sequence length and calculates a parity sequence.
Abstract:
PROBLEM TO BE SOLVED: To easily utilize a vehicle charging device even in the case where a plurality of vehicles utilize the vehicle charging device in common.SOLUTION: A vehicle charging device 1 is connected with a plurality of reservation terminals 4 and configured to supply charging power to a plurality of vehicles 7 on the basis of reservation input information inputted from the reservation terminals 4. The vehicle charging device 1 comprises a power supply section 14 which supplies the charging power while dividing it to the plurality of vehicles 7, a reservation information acquisition section 11 which acquires the reservation input information from the plurality of reservation terminals 4, a charging timing creation section 12 which creates charging timing management information for each vehicle 7 on the basis of the reservation input information acquired by the reservation information acquisition section 11, and a charging control section 15 which controls the charging power to be supplied by the power supply section 14 while dividing it to the plurality of vehicles 7 on the basis of the charging timing management information created by the charging timing creation section 12.