Abstract: A high frequency coupler includes a ground, a first coupling electrode connected via a first resonator unit to an input and output terminal of a communication circuit, and one or more second coupling electrodes connected via a second resonator unit designed utilizing a ground to a ground terminal of the communication circuit.

Abstract: A communication station needs to autonomously and synchronously operate by maintaining an equal frame interval. A clock error is measured from a received packet in a wireless communication system where a beacon is transmitted periodically. This clock error is used to synchronize a counter to count the beacon's transmission/reception time and adjust a clock cycle deviation for synchronization. The synchronization is possible even in the case of restoration from a sleep state when the reference clock accuracy is poor. A period to maintain the sleep state can be extended irrespectively of the clock accuracy. It is possible to prevent desynchronization due to incorrect synchronization with an abnormal value.

Abstract: A resending control circuit for controlling resending of data to be sent to a sending destination, includes: a writing unit for writing resending information generated corresponding to each of data to be resent and including the resending point-in-time of the data in memory; a reading unit for reading out the resending information from the memory; and a control unit for comparing resending point-in-time included in the oldest resending information of resending information stored in the memory with current point-in-time, and executing resending processing of data corresponding to the resending information according to the comparison result.

Abstract: A communication apparatus includes a storage unit having a plurality of storage areas corresponding to a plurality of candidates of a destination of data to be transmitted, a detecting unit for detecting the amount of data stored in each of the storage areas, a destination selecting unit for selecting one destination from among the destination candidates on the basis of at least the amount of data detected by the detecting unit, and a transmission signal generating unit for reading out a predetermined amount of data to be transmitted to the destination selected by the destination selecting unit, from the corresponding storage area, and generating a transmission signal.

Abstract: A communication system includes a transmission device and a reception device. The transmission device includes a first software processor that performs, if a first information portion has been updated, software processing on the first information portion, a first hardware processor that performs hardware processing on a second information portion, a generation unit that generates a beacon signal, and a transmitter that transmits the generated beacon signal. The reception device includes a reception unit that receives the beacon signal, a separator that separates the first information portion from the second information portion, a second hardware processor that performs hardware processing on the separated second information portion, a determination unit that determines whether the separated first information portion has been updated, and a second software processor that performs, if the first information portion has been updated, software processing on the updated first information portion.

Abstract: A communication apparatus that performs data transmission on a medium according to the packet switching system includes an upper-layer processing unit that performs processing of data to be transmitted, a Phy processing unit that manages an operation of physical access to the medium, and a media-access-control processing unit that generates a transmission packet, instructs the Phy processing unit to transmit the packet, and performs control for access to the medium. The media-access-control processing unit includes a buffer memory, a transmission buffer list, and a header-information generating unit. The media-access-control processing unit instructs the Phy processing unit to transmit a preamble signal, starts generation processing for the header information by the header-information generating means, and instructs the Phy processing unit to transmit, before the transmission of the preamble signal is finished, the header information generated.

Abstract: In order to reduce latency until when processing in accordance with each piece of header information included in a header is started, a communication device is provided with a header decoding portion (108) that decodes a received header; a post-decoding header output portion (112) that outputs the decoded header; a header error detection portion (106) that uses a header error-detecting code to check whether there are any errors in the header; and a post-decoding header update portion (110) that, if an error is detected in the header by the header error detection portion, updates the decoded header output by the post-decoding header output portion. The header decoding portion starts header decoding before the header error detection portion checks whether there are any errors in the header, and the post-decoding header output portion starts to output the decoded header before the header error detection portion checks for errors.