Patent application number | Description | Published |
20100081484 | COMMUNICATION APPARATUS, SEMICONDUCTOR INTEGRATED CIRCUIT, AND ELECTRONIC DEVICE - A communication apparatus ( | 04-01-2010 |
20150181501 | RADIO COMMUNICATION APPARATUS AND RADIO COMMUNICATION METHOD - An interfering wave is detected using, in a received signal including a preamble and a control signal field, a plurality of symbols including a symbol configuring the preamble and a symbol configuring the control signal field. The received signal has one of a plurality of transmission formats that use at least either a first frequency band or a second frequency band. In a signal quality detector, a symbol differential calculator calculates, in each of the first frequency band and the second frequency band, differences between a certain number of symbols adjacent to one another at predetermined positions in a time domain among the plurality of symbols. A square operator performs square operations on results of the calculation of differences. An interference determiner determines, using results of the square operations, whether each of the first frequency band and the second frequency band includes an interfering wave. | 06-25-2015 |
20150195111 | WIRELESS COMMUNICATION DEVICE AND WIRELESS COMMUNICATION METHOD - A tuner receives a received signal using one of a plurality of transmission formats that use at least one of either a first frequency or a second frequency band. A determination unit determines the transmission format being used in the received signal from among the plurality of transmission formats. In the determination unit, a pattern matching unit stores in advance a plurality of patterns respectively expressing a received waveform of a preamble in each of the plurality of transmission formats, conducts a pattern matching process between the received signal and the each of the plurality of patterns, and obtains a correlation value. A transmission mode determination unit determines the transmission format being used in the received signal on the basis of the correlation value. | 07-09-2015 |
20150288555 | TRANSMITTER, RECEIVER, TRANSMISSION METHOD, AND RECEPTION METHOD - A preamble generating unit generates first and second synchronization preambles having different numbers of subcarriers. A transmission signal generating unit generates an OFDM transmission signal through time-division multiplexing by using the generated first and second synchronization preambles. A transmission RF unit converts the generated OFDM transmission signal into a radio-frequency OFDM signal and transmits the radio-frequency OFDM signal. The preamble generating unit adds a predetermined dummy period between the first synchronization preamble and the second synchronization preamble. | 10-08-2015 |
20150349999 | RECEPTION APPARATUS AND FREQUENCY ERROR CORRECTION METHOD - Provided is an OFDM reception apparatus that can reduce, even in an environment where the influence of noises is strong, this influence of the noises, thereby improving the precision of detecting a carrier frequency error. In this apparatus, a filtering unit ( | 12-03-2015 |
20150358183 | RECEIVER APPARATUS AND FREQUENCY SELECTIVITY INTERFERENCE CORRECTION METHOD - An OFDM receiver apparatus ( | 12-10-2015 |
Patent application number | Description | Published |
20080298371 | RELAY APPARATUS CAPABLE OF PREVENTING MISTAKEN LEARNING OF MAC ADDRESS LEARNING TABLE - A relay apparatus includes a MAC (Media Access Control) address learning table for recording transfer destinations for frames. The relay apparatus is connected to other relay apparatuses to compose a network of a ring redundancy method. The relay apparatus includes a port move detecting circuit for detecting a port move which occurs in a case where a frame arrives from other than a path learned in the MAC address leaning table on a path changing on ring redundancy. | 12-04-2008 |
20090316723 | COMMUNICATION SYSTEM, COMMUNICATION DEVICE AND COMMUNICATION METHOD USED THEREFOR - In a communication system which communicates between communication apparatuses by using a transmission path in which a bandwidth varies, a plurality of communication lines are grouped into a plurality of multiplex groups based on priorities of data to be transmitted. The communication system includes a detecting section configured to detect a variation of the bandwidth of said transmission path; and a closing section configured to close or release said communication lines of each of said plurality of multiplex groups based on the detected variation. | 12-24-2009 |
20110268132 | DEVICE AND METHOD FOR TRANSMISSION OF TDM SIGNAL OVER ASYNCHRONOUS NETWORK - A transmission device which transmits a packet to a destination transmission device through an asynchronous network, the packet accommodating a plurality of time division multiplexing (TDM) channels, includes: an unused-channel information storage section for storing unused-channel information on an unused one of a predetermined number of TDM channels; and an unused channel deletion section for deleting an unused channel from the predetermined number of TDM channels accommodated in a received packet by referring to the unused-channel information, to generate a compressed packet to transmit to the destination transmission device. | 11-03-2011 |
20120177055 | SWITCH DEVICE, NETWORK, AND ADDRESS LEARNING METHOD USED FOR THEM - A switch device capable of achieving a significant load reducing effect without placing any load on the MAC address learning function is provided. A switch device ( | 07-12-2012 |
20150120622 | SWITCHING SYSTEM, LINE CARD, SWITCH CARD, FDB LEARNING METHOD, FDB LEARNING ARBITRATION METHOD AND PROGRAM - A switching system includes a plurality of line cards and a switch card. The line card or cards notifies the switch card about whether or not the line card or cards is in the FDB learning enabled state. The switch card includes a learning information storage unit that holds in store the FDB learning information received from the multiple line cards and an FDB learning arbitration unit that, when all of the line cards are in an FDB learning enabled state, selects and sends the FDB learning information, stored in the learning information storage unit, to the respective line cards, based on a notification from each of the line cards. | 04-30-2015 |