Abstract: A radio wave monitoring apparatus that communicates with a wireless communication device which is separately provided from the radio wave monitoring apparatus and is configured to perform wireless communication via a channel selected from a plurality of channels; detects a specific radio wave at the plurality of channels; selects a channel for the wireless communication in response to a request from the wireless communication device and based on a result of the detecting; and sends channel information indicating the selected channel to the wireless communication device.

Abstract: A channel for which connection has been established is classified into an unavailable channel or an available channel. When there are a plurality of available channels, one or more channels among the plurality of available channels is selected as a channel for which connection is to be maintained for communication.

Abstract: A wireless communication device that obtains a current degree of interference at each of a plurality of available channels; determines whether a wireless communication is susceptible to interference based on whether a condition corresponding to implementation of the wireless communication is satisfied; and sets a channel for the wireless communication among the plurality of available channels based on the current degree of interference at each of the plurality of available channels when it is determined that the wireless communication is susceptible to interference

Abstract: A wireless LAN device for wirelessly communicating using a specific frequency channel shared by a radar and a wireless LAN system. The wireless LAN device includes a plurality of antennas; a wireless communication unit including a plurality of transceiver circuits respectively provided for each of the plurality of antennas; and a controller that controls the wireless communication unit. The wireless communication unit wirelessly communicates in accordance with a multiple input multiple output (MIMO) scheme by the plurality of transceiver circuits, and the controller controls the wireless communication unit to execute radar wave monitoring on a frequency channel different from a frequency channel in use for wireless communication using one of the plurality of transceiver circuits when the frequency channel in use for the wireless communication is the specific frequency channel.

Abstract: A transmitting apparatus for transmitting user data, includes: an establishing section that establishes three or more transmission paths for a receiving apparatus; a first generation section that generates a user data unit which includes user data to be transmitted to the receiving apparatus; and a second generation section that generates an error correction data unit which includes error correction data to be used for error correction of the user data to be transmitted to the receiving apparatus. At least one of the three or more transmission paths transmits the error correction data unit, and at least two of the three or more transmission paths transmits the user data unit.

Abstract: An access point establishing a wireless LAN is constructed to have a monitor system ‘b’ for monitoring an available channel for communication, in addition to a communication system ‘a’. In the event of detection of radar/radio signals, the access point changes a communication channel used for wireless communication from a current active channel to the monitored channel. Each terminal belonging to the wireless LAN recognizes and follows this channel change by detection of a beacon broadcasted by the access point. In the case of non-detection of radar/radio signals for one minute at the monitored channel, the wireless communication is reestablished immediately at the monitored channel recognized as a CAC (channel availability check)-finished channel. This series of processing is also applicable to inter-access point communication, for example, communication in a WDS (wireless distribution system) mode.

Abstract: A wireless LAN device for wirelessly communicating using a specific frequency channel shared by a radar and a wireless LAN system. The wireless LAN device includes a plurality of antennas; a wireless communication unit including a plurality of transceiver circuits respectively provided for each of the plurality of antennas; and a controller that controls the wireless communication unit. The wireless communication unit wirelessly communicates in accordance with a multiple input multiple output (MIMO) scheme by the plurality of transceiver circuits, and the controller controls the wireless communication unit to execute radar wave monitoring on a frequency channel different from a frequency channel in use for wireless communication using one of the plurality of transceiver circuits when the frequency channel in use for the wireless communication is the specific frequency channel.

Abstract: A wireless communication device or an access point includes: a main unit; an external antenna unit; a throughput check module; and a notification controller, a notice applying circuit and a notice generating circuit. The main unit is for including a communication control circuit. The external antenna unit is for including an antenna and is electrically connected with the main unit via a cable. The throughput check module is for checking throughput of communication with another wireless communication device or a station. The notification controller, the notice applying circuit and the notice generating circuit are for notifying a user of system information based on check result by the throughput check module, by using the external antenna unit. This configuration improves the work efficiency of antenna adjustment at the wireless communication device using the external antenna unit.

Abstract: A transmitting apparatus for transmitting user data, includes: an establishing section that establishes three or more transmission paths for a receiving apparatus; a first generation section that generates a user data unit which includes user data to be transmitted to the receiving apparatus; and a second generation section that generates an error correction data unit which includes error correction data to be used for error correction of the user data to be transmitted to the receiving apparatus. At least one of the three or more transmission paths transmits the error correction data unit, and at least two of the three or more transmission paths transmits the user data unit.

Abstract: A wireless LAN base station is operated with a battery or an AC adapter, and transmits and receives communication signals to and from another wireless LAN apparatus. The wireless LAN base station includes: PA and LNA configured to amplify the communication signals; selectors configured to select amplification routes through which the communication signals go through the amplifier, or bypass routes through which the communication signals bypass the amplifier; an AC/battery detecting circuit configured to detect a battery operation state where the wireless LAN base station is operated with the battery, and a AC operation state where the wireless LAN base station is operated with the AC adapter; and a CPU configured to have the amplification routes selected if the AC operation state is detected, and to have the bypass routes selected if the battery operation state is detected.

Abstract: An access point establishing a wireless LAN is constructed to have a monitor system ‘b’ for monitoring an available channel for communication, in addition to a communication system ‘a’. In the event of detection of radar/radio signals, the access point changes a communication channel used for wireless communication from a current active channel to the monitored channel. Each terminal belonging to the wireless LAN recognizes and follows this channel change by detection of a beacon broadcasted by the access point. In the case of non-detection of radar/radio signals for one minute at the monitored channel, the wireless communication is reestablished immediately at the monitored channel recognized as a CAC (channel availability check)-finished channel. This series of processing is also applicable to inter-access point communication, for example, communication in a WDS (wireless distribution system) mode.

Abstract: A multi-input multi-output communication device can communicate with other communication device. The multi-input multi-output communication device includes: an antenna device configured to perform communication using a plurality of polarized waves; a transmitting circuit configured to divide data to be transmitted into a plurality of data streams, and transmit the data by multiplexing signals corresponding to the data streams on the plurality of polarized waves from the antenna device; and a receiving circuit configured to receive data by separating signals multiplexed at the other communication device from a signal received by the antenna device via the plurality of polarized waves.

Abstract: An antenna device for wireless LAN of the present invention includes a base module and an antenna case that receives a built-in antenna therein. A metal reflector plate is held in a base element of the base module. The reflector plate functions to widen the range of directivity of the antenna device and thus ensures stable communication for wireless LAN. The antenna case is pivotable to the base module. The antenna is adjustable to a desired angle according to the requirement, so as to attain communication for wireless LAN.

Abstract: An antenna device for wireless LAN of the present invention includes a base module and an antenna case that receives a built-in antenna therein. A metal reflector plate is held in a base element of the base module. The reflector plate functions to widen the range of directivity of the antenna device and thus ensures stable communication for wireless LAN. The antenna case is pivotable to the base module. The antenna is adjustable to a desired angle according to the requirement, so as to attain communication for wireless LAN.