Patent application number | Description | Published |
20080240143 | COMMUNICATION APPARATUS, COMMUNICATION SYSTEM, AND COMMUNICATION CONTROL METHOD - A communication apparatus which performs a carrier detection and is connected to a transmission line includes: a carrier detecting unit which detects a first control signal for the carrier detection and a second control signal for the carrier detection; a comparing unit which compares carrier detecting results obtained by the carrier detecting unit; and a control unit which controls at least one of a symbol length of the first control signal and a symbol length of the second control signal based upon a comparison result obtained by the comparing unit. | 10-02-2008 |
20080273581 | COMMUNICATION APPARATUS AND COMMUNICATION METHOD USING DIGITAL WAVELET MULTI CARRIER TRANSMISSION SYSTEM - In case of disposing a pilot symbol in data transmission which depends on a DWMC transmission system, in a plurality of transmission symbols on a time axis, a pilot symbol, which becomes a signal of a sine wave, is configured, by giving contiguous identical data in a plurality of predetermined symbols. By transmitting a transmission signal with the use of this pilot signal, between a transmitting device and a receiving device, it is possible to carry out channel equalization by complex information which is obtained from a pilot symbol. | 11-06-2008 |
20080304577 | POWER-LINE COMMUNICATION METHOD, POWER-LINE COMMUNICATION DEVICE, AND POWER-LINE COMMUNICATION SYSTEM - To provide a power-line communication method, a power-line communication device, and a power-line communication system, which can make communication with high communication efficiency even when the condition of a power line is changed. In step S | 12-11-2008 |
20090017757 | COMMUNICATION APPARATUS, INTEGRATED CIRCUIT AND COMMUNICATION METHOD - A diversity circuit uses a plurality of sub-carriers showing CINRs below a lowest threshold, so as to form a sub-carrier group so that combined CINR of the sub-carriers is above the lowest threshold. A diversity tone map generator generates a tope map associated with the lowest primary modulation scheme, based on output from the diversity circuit. A tone map generator generates a tone map associated with primary modulation schemes applied to respective sub-carriers, based on output from the diversity tone map generator. | 01-15-2009 |
20090060061 | COMMUNICATION APPARATUS, COMMUNICATION METHOD, AND INTEGRATED CIRCUIT - A communication apparatus is connected to a transmission channel for transmitting data to another communication apparatus. The communication apparatus includes: a communication frame generator which generates a communication frame for storing the data; and a controller which controls to insert a pilot symbol into the communication frame based on a state of the transmission channel. | 03-05-2009 |
20090103642 | COMMUNICATION APPARATUS, COMMUNICATION METHOD, CIRCUIT MODULE AND INTEGRATED CIRCUIT - In communication method for communicating via a transmission channel to which first communication apparatuses communicating based on a first communication system, second communication apparatuses communicating based on a second communication system, and third communication apparatuses communicating based on a third communication system are connected, a data transmission domain and a notification domain for notifying a data transmission within the data transmission domain are allocated to the first communication apparatuses, the second communication apparatuses, and the third communication apparatuses, respectively. In the communication method, notices of the data transmission for each of the first communication apparatuses, the second communication apparatuses and the third communication apparatuses are transmitted within the notification domain, and the data transmission domain is reallocated in accordance with the notices transmitted from the first, second and third communication apparatuses. | 04-23-2009 |
20090110096 | COMMUNICATION APPARATUS, COMMUNICATION METHOD AND INTEGRATED CIRCUIT - A communication apparatus carries out multicarrier communication with another communication apparatus through a transmission channel. The communication apparatus includes a first communication unit which carries out communication using a subcarrier at a first frequency band; a second communication unit which carries out communication using a subcarrier at a second frequency band higher than the first frequency band; and a third communication unit which carries out communication by synchronizing the first communication unit with the second communication unit and concurrently using the first and second frequency bands. | 04-30-2009 |
20090110101 | COMMUNICATION APPARATUS - A wave detecting section of a receiver has a first wavelet transformer involving a plurality of wavelet filters orthogonal to each other for performing a wavelet transform on received waveform data, a Hilbert transformer for performing a Hilbert transform on the received waveform data, a second wavelet transformer having the same configuration as that of the first wavelet transformer for performing a wavelet transform on outputs from the Hilbert transformer, a code converter for inverting the codes of outputs in odd-numbered places among outputs from the second wavelet transformer, a level converter for correcting fluctuations of outputs from the code converter attributable to a ripple of the Hilbert transformer, and a complex data generator for generating complex data, by defining outputs of the first wavelet transformer as in-phase components of the complex information and outputs from the level converter as orthogonal components of the complex information. | 04-30-2009 |
20090135932 | POWER-LINE CARRIER COMMUNICATION APPARATUS - The invention provides a power-line carrier communication apparatus including a transmission unit with a signal point mapping device for mapping a plurality of bit streams produced from transmission data, a wavelet inverse transforming device for modulating the respective sub-carriers by wavelet waveforms which are orthogonal to each other for producing temporal waveform series data, and a D/A converter for converting the temporal waveform series data into an analog temporal waveform series signal; and a reception unit with an A/D converter for obtaining sampling-series waveform data from a power-line communication signal, a wavelet transforming device for wavelet-transforming the sampling-series waveform data into signal point data of the respective sub-carriers, and a symbol judging device for judging bit streams mapped by the signal point mapping device by inverse-mapping a plurality of these signal point data, and for synthesizing the judged bit streams with each other as a reception data series. | 05-28-2009 |
20090190673 | Power line communication apparatus, integrated circuit for power line communication and transmission/reception methods - Transmitter | 07-30-2009 |
20090220018 | TRANSMITTER AND METHOD FOR DIGITAL MULTI-CARRIER TRANSMISSION - The present invention relates to a transmitter and method employing a multi-carrier transmission method, especially utilizing real coefficient wavelet filter banks. The transmitter includes a preamble data generator, a modulator, and a ramp processor. The preamble data generator generates preamble bit data, and outputs the preamble data. The modulator modulates the preamble data, generates a plurality of subcarriers, and outputs a composite wave of the time waves of the plurality of subcarriers. Subsequently, the ramp processor performs ramp processing on the composite wave with a certain delay period from a reference position of the composite wave. | 09-03-2009 |
20090238288 | COMMUNICATION APPARATUS AND COMMUNICATION METHOD - A communication system includes a synchronizing signal generator that generates a synchronizing signal based on a timing of an alternating waveform in a power line, a data communicating circuit that performs the data communication, and a communication controller that controls to acquire a transmitting right utilizing a timing of the synchronizing signal and to control the communication circuit in accordance with whether or not the communication apparatus acquires the transmitting right. | 09-24-2009 |
20090310699 | COMMUNICATION APPARATUS, COMMUNICATION METHOD, AND INTEGRATED CIRCUIT - A communication apparatus for transmitting transmission data containing a preamble and a postamble is provided. The communication apparatus includes: a phase vector assigning unit which assigns a first phase vector to a plurality of subcarriers relating to the preamble and assigns a second phase vector to a plurality of subcarriers relating to the postamble, the first phase vector being different from the second phase vector. | 12-17-2009 |
20100074243 | MANAGING COEXISTENCE AMONG SIGNALING PROTOCOLS ON A SHARED MEDIUM - A method is described for communicating among multiple devices over a shared communication medium. The method includes, in a schedule among multiple subsets of the devices that includes at least one respective time slot for each subset, transmitting from at least one of the devices in a given subset a presence signal associated with the given subset within a time slot for the given subset. A presence signal associated with a given subset is configured to indicate the presence of at least one device in the given subset. The method also includes communicating among devices in a given subset based on presence signals detected from one or more devices in at least one different subset. | 03-25-2010 |
20100111153 | POWER LINE COMMUNICATION APPARATUS AND POWER LINE COMMUNICATION METHOD - A power line communication apparatus is provided with an auto gain detector that detects a gain fluctuation of an AGC (Auto Gain Control) circuit that automatically adjusts a gain of a received signal; a retry ratio calculator that calculates a ratio of retry based on output from an ARQ (Automatic Repeat request) unit that detects an error in the received data and issues a repeat request; and a transmission rate calculator that calculates a transmission rate based on output from a channel estimation unit that calculates a CNR so as to estimate a transmission status. A display displays a transmission status, including the detected AGC noise fluctuation, retry ratio, transmission rate and the like. | 05-06-2010 |
20100195772 | OFDM SYMBOL DETECTING METHOD, COMMUNICATION APPARATUS, INTEGRATED CIRCUIT, AND CIRCUIT MODULE - A method of detecting symbols of an OFDM signal constituted by a plurality of carriers transmitted from another communication apparatus, includes selecting first carriers, where a phase difference between the symbols adjacent on a time domain is smaller than a predetermined value, from a plurality of carriers of a received signal, selecting second carriers, each of which has a phase of a predetermined relation of the OFDM signal with respect to another carrier, from the selected first carriers, and determining whether the received signal has the symbols of the OFDM signal transmitted from the another communication apparatus on the basis of the selection results of the first and second carriers. | 08-05-2010 |
20100226446 | COMMUNICATION APPARATUS - A communication apparatus has an A/D converter which converts an analog signal which was received, into a digital signal, a converter which converts a reception signal so as to enable handling of phase information, a carrier detector which detects presence or absence of the reception signal, a synchronous circuit which extract synchronization timing from the reception signal, an equalizer which corrects the reception signal so as to cancel influence of a transmission path, a transmission path estimator which estimates a state of a power line transmission path, and a judging unit which judges the reception signal, which was amended by the equalizer, by use of a threshold value. | 09-09-2010 |
20100322322 | POWER-LINE CARRIER COMMUNICATION APPARATUS - The invention provides a power-line carrier communication apparatus including a transmission unit with a signal point mapping device for mapping a plurality of bit streams produced from transmission data, a wavelet inverse transforming device for modulating the respective sub-carriers by wavelet waveforms which are orthogonal to each other for producing temporal waveform series data, and a D/A converter for converting the temporal waveform series data into an analog temporal waveform series signal; and a reception unit with an A/D converter for obtaining sampling-series waveform data from a power-line communication signal, a wavelet transforming device for wavelet-transforming the sampling-series waveform data into signal point data of the respective sub-carriers, and a symbol judging device for judging bit streams mapped by the signal point mapping device by inverse-mapping a plurality of these signal point data, and for synthesizing the judged bit streams with each other as a reception data series. | 12-23-2010 |
20110058594 | COMMUNICATION METHOD AND POWER LINE COMMUNICATION TERMINAL - In power line communication using a power line as a transmission path, a transmitter terminal transmits a communication signal while changing a phase parameter of the communication signal transmitted, in the continuous communication signal, according to an impedance variation amount on the transmission path. In this communication method, the communication signal is received stably with no variation in the phase parameter of the communication signal in response to the impedance variation amount on the transmission path, permitting high-speed data communication with reduced communication error. | 03-10-2011 |
20110150104 | COMMUNICATION APPARATUS, INTEGRATED CIRCUIT, AND COMMUNICATION METHOD - A communication apparatus repeatedly outputs a first multi-carrier signal SS during predetermined periods T | 06-23-2011 |
20110150105 | COMMUNICATION APPARATUS, INTEGRATED CIRCUIT, AND COMMUNICATION METHOD - A communication apparatus repeatedly outputs a first multi-carrier signal SS during predetermined periods T | 06-23-2011 |
20110183642 | POWER LINE COMMUNICATION APPARATUS AND POWER LINE COMMUNICATION METHOD - A power line communication apparatus is provided with an auto gain detector that detects a gain fluctuation of an AGC (Auto Gain Control) circuit that automatically adjusts a gain of a received signal; a retry ratio calculator that calculates a ratio of retry based on output from an ARQ (Automatic Repeat request) unit that detects an error in the received data and issues a repeat request; and a transmission rate calculator that calculates a transmission rate based on output from a channel estimation unit that calculates a CNR so as to estimate a transmission status. A display displays a transmission status, including the detected AGC noise fluctuation, retry ratio, transmission rate and the like. | 07-28-2011 |
20110320906 | ENCODER, DECODER, AND ENCODING METHOD - An encoder and decoder using LDPC-CC which avoid lowering the transmission efficiency of information while not deteriorating error correction performance, even at termination; and an encoding method of the same. A termination sequence length determining unit ( | 12-29-2011 |
20120155521 | COMMUNICATION APPARATUS, INTEGRATED CIRCUIT, AND COMMUNICATION METHOD - In communication method for communicating via a transmission channel to which first communication apparatuses communicating based on a first communication system, second communication apparatuses communicating based on a second communication system, and third communication apparatuses communicating based on a third communication system are connected, a data transmission domain and a notification domain for notifying a data transmission within the data transmission domain are allocated to the first communication apparatuses, the second communication apparatuses, and the third communication apparatuses, respectively. In the communication method, notices of the data transmission for each of the first communication apparatuses, the second communication apparatuses and the third communication apparatuses are transmitted within the notification domain, and the data transmission domain is reallocated in accordance with the notices transmitted from the first, second and third communication apparatuses. | 06-21-2012 |
20120193983 | POWER SOURCE DEVICE AND VEHICLE - Disclosed are a power source device and a vehicle having increased reliability as backup in the event of a power cut, even when the power of the vehicle is used during a power cut. A power source device ( | 08-02-2012 |
20130016792 | MANAGING COEXISTENCE AMONG SIGNALING PROTOCOLS ON A SHARED MEDIUM - Within a domain of a master device, devices that share a power line as a communications medium monitor signal detection windows to sense network status. The devices transmit sensed network status to the master device. The master device allocates channel resources based on the network statuses communicated by the devices within the domain. | 01-17-2013 |
20130287127 | COMMUNICATION APPARATUS, INTEGRATED CIRCUIT, AND COMMUNICATION METHOD - A communication apparatus repeatedly outputs a first multi-carrier signal SS during predetermined periods T | 10-31-2013 |
20130334872 | POWER LINE COMMUNICATION DEVICE, POWER LINE COMMUNICATION SYSTEM, POWER LINE COMMUNICATION METHOD, AND POWER LINE COMMUNICATION PROGRAM - Provided is a power line communication device capable of performing reliable power line communication, without requiring detection of switching noises. The power line communication device corresponds to an MPPT controller ( | 12-19-2013 |
20140023152 | COMMUNICATION APPARATUS, INTEGRATED CIRCUIT, AND COMMUNICATION METHOD - In communication method for communicating via a transmission channel to which first communication apparatuses communicating based on a first communication system, second communication apparatuses communicating based on a second communication system, and third communication apparatuses communicating based on a third communication system are connected, a data transmission domain and a notification domain for notifying a data transmission within the data transmission domain are allocated to the first communication apparatuses, the second communication apparatuses, and the third communication apparatuses, respectively. In the communication method, notices of the data transmission for each of the first communication apparatuses, the second communication apparatuses and the third communication apparatuses are transmitted within the notification domain, and the data transmission domain is reallocated in accordance with the notices transmitted from the first, second and third communication apparatuses. | 01-23-2014 |
20140198861 | COMMUNICATION APPARATUS, INTEGRATED CIRCUIT, AND COMMUNICATION METHOD - In communication method for communicating via a transmission channel to which first communication apparatuses communicating based on a first communication system, second communication apparatuses communicating based on a second communication system, and third communication apparatuses communicating based on a third communication system are connected, a data transmission domain and a notification domain for notifying a data transmission within the data transmission domain are allocated to the first communication apparatuses, the second communication apparatuses, and the third communication apparatuses, respectively. In the communication method, notices of the data transmission for each of the first communication apparatuses, the second communication apparatuses and the third communication apparatuses are transmitted within the notification domain, and the data transmission domain is reallocated in accordance with the notices transmitted from the first, second and third communication apparatuses. | 07-17-2014 |
20140310567 | TRANSMISSION APPARATUS INCLUDING ENCODER, RECEPTION APPARATUS INCLUDING DECODER, AND ASSOCIATED METHODS - An encoder and decoder using LDPC-CC which avoid lowering the transmission efficiency of information while not deteriorating error correction performance, even at termination; and an encoding method of the same. A termination sequence length determining unit determines the sequence length of a termination sequence transmitted added to the end of an information sequence, according to the information length (information size) and encoding rate of the information sequence. A parity calculation unit carries out LDPC-CC coding on the information sequence and the known-information sequence necessary for generating a termination sequence of the determined termination sequence length, and calculates a parity sequence. | 10-16-2014 |
20150043664 | COMMUNICATION APPARATUS, INTEGRATED CIRCUIT, AND COMMUNICATION METHOD - A communication apparatus repeatedly outputs a first multi-carrier signal SS during predetermined periods T1, T2, T3, . . . , and outputs a second multi-carrier signal RS whose phase vector is different from that of the first multi-carrier signal SS, at a predetermined timing based on the first multi-carrier signal SS. The communication apparatus further detects the second multi-carrier signal RS output from another communication apparatus, which uses a different communication method from the communication apparatus. Accordingly, both communication apparatuses can differentiate the first multi-carrier signal SS from the second multi-carrier signal RS without performing relatively cumbersome modulation and other processes. | 02-12-2015 |