Abstract:
PROBLEM TO BE SOLVED: To provide an electric automobile that can be self-managed in real time by utilizing a function of an electric automobile data communication system, and is improved in security. SOLUTION: An electric outlet 2 is connected to a lamp line network 7, a plug 1 is connected to an input of a live part 4 in the electric automobile 3, an input of the live part 4 is branched and connected to a lamp line communication unit 5. In a house, a personal computer 9 is connected to the other medium network 8, and the other medium network 8 and the lamp line network 7 are connected to an input of a gateway device 10. An output of the gateway device 10 is connected to an input of a modem device 11. An output of the modem device 11 is connected to the Internet 13 and an information distribution server 12 via the Internet 13. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To prevent an electric motorcycle from being stolen, even when the electric motorcycle is intended to be charged. SOLUTION: A charging device 3 for a vehicle supplies electric power to a power supply port which is exposed when an openable and closable seat of electric motorcycle body is opened, and includes a power supply cable 5 and a power feeing plug 4 which is connected to the power supply cable 5 and is attached to the power supply port for supplying electric power. A power supply plug body 4a is provided with a locking part 21 which, based on the control signal received through the power supply cable 5, locks the power supply plug 4a to the inside wall of the power supply port of the electric motorcycle body or unlocks it from the inside wall of the power supply port. So, the power supply plug body 4a can be locked to the inside wall of the power supply port of the electric motorcycle body based on the control signal, and once it is locked to the inside wall of the power supply port, the locking part 21 is harder to be broken than in the case it is locked outside the power supply port and the power supply plug 4 cannot be removed from the power supply port. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To obtain communicating equipment which performs transmitting-path estimation in relation to a transmitting-path variation of a power line etc., with high accuracy. SOLUTION: The communicating equipment has an A-D converter for converting a received analog signal into a received digital signal, a wavelet transformer for so wavelet-transforming the received signal as to be able to deal with its phase relation, a carrier detector for detecting the existence of the received signal, a synchronizing circuit for extracting synchronizing timing from the received signal, an equalizer for so correcting the received signal as to cancel the effect of a transmitting path, a transmitting-path estimator for estimating the state of a power-line transmitting path, and a determination device for determining the received signal corrected by the equalizer by using a threshold. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a communication method capable of efficiently transmitting data by preventing collision of signals while meeting the restriction of delay corresponding to the data to be transmitted by a plurality of kinds of communication apparatuses having different communication system. SOLUTION: The communication method is such that when notice signals ϕA, ϕB, ϕC corresponding to communication systems A, B, C and a notice signal (not shown) corresponding to a communication system D are transmitted during a control signal section C of an allocated communication cycle H, the data slots of a control cycle T configuring a communication cycle H2 are periodically assigned to the communication systems A, B, C in advance. In this case, the data slots to be assigned to the communication systems fixedly correspond to the respective communication systems. COPYRIGHT: (C)2009,JPO&INPIT
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 communication apparatus and method with a multi-carrier transmission system capable of using a pilot symbol that can handle a complex-number information, in data transmission of the multi-carrier transmission system operating by OFDM based on the wavelet transform for performing real coefficient wavelet transform. SOLUTION: When establishing the pilot symbol in a data transmission by using a DWMC transmission system, in a plurality of transmission symbols on a time axis, the pilot symbol that becomes a sinusoidal wave signal is established by giving continuous identical data in a plurality of prescribed symbols. A transmission signal using the pilot symbol is transmitted between a transmitter and a receiver, so that a transmission channel can be equalized by the complex-number information obtained by the pilot symbol. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To accurately determine presence/absence of a multi-carrier signal in a short time. SOLUTION: In a carrier detector of a communication device, a phase difference between symbols continuous in each sub-carrier in OFDM signals is calculated in an inter-symbol calculation part 613 first, and then the sub-carriers where the phase difference between the continuous symbols is equal to or smaller than π/4 are selected in a carrier selection part 615. Then, the phase difference between sub-carriers adjacent to each other is calculated in an inter-carrier calculation part 614, and a quadrant counter 616 executes counting in accordance with each quadrant for which signal points representing the phase difference between the adjacent sub-carriers exist on the complex plane. Then, in a comparison part 617, whether the ratio of the count value of a specified quadrant to the total number (inter-carrier total number) of sets of adjacent sub-carriers selected in the carrier selection part 615 is equal to or larger than a predetermined ratio, and thus the presence/absence of the carrier is determined. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To increase transmission efficiency by inhibiting an influence of group delay of a filter to be provided in order to pass through a working frequency band thereby making a frequency band near a passing frequency of the filter usable. SOLUTION: An analog part 301 which is an input part of a receiving part 300 of a PLC modem 10 is provided with an analog high-pass filter (HPF) 311 which shields frequencies lower than a predetermined working frequency band. A digital part 302 is provided with an inverse delay characteristic filter 321 which has inverse characteristics of group delay characteristics of the analog HPF 311 as a filter coefficient. By the inverse delay characteristic filter 321, the group delay characteristics of the analog HPF 311 are corrected, and deterioration in CINR due to group delay is inhibited. 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.