1978results about How to "Improve communication performance" patented technology

A system and method are provided to increase data rates available in mmWave wireless communication systems by adapting a multiple-input multiple-output (MIMO) in a next generation mmWave wireless communication system. The system and method advantageously employ the characteristics of mmWave antenna arrays, including multiple antenna elements in each antenna array, to implement the MIMO scheme by establishing multiple beamformed communication links between a mmWave transmitter and receiver. An outgoing signal is divided into multiple signal elements to correspond to the multiple beamformed links and each of the multiple signal elements is transmitted by the transmitter across a different one of the multiple beamformed links to be reassembled at the receiver. An antenna element allocation scheme is incorporated to assign specific numbers and configurations of antenna elements at each of the transmitted and receiver to each of the multiple beamformed communication links.

A method for operating an access point in a wireless local area network (WLAN) is provided. The access point includes a directional antenna for communicating with a plurality of remote stations, and the directional antenna includes a plurality of antenna patterns. The method includes creating an antenna database by associating between the access point and each remote station a respective measured signal quality corresponding to the plurality of antenna patterns. The respective measured signal qualities are determined by the access point based upon communications with each remote station. The method further includes determining for each remote station a preferred antenna pattern based upon the antenna database, and selecting a remote station and the corresponding preferred antenna pattern to communicate with. It is also determined based upon the antenna database and prior to communicating with the selected remote station, if any non-selected remote stations have the potential of not being aware when such communications actually occurs.

A method for communication over a wireless local area network (WLAN) includes receiving uplink signals from a plurality of stations in the WLAN. Responsively to the uplink signals, a set of the stations is selected for inclusion in a spatial multiplexing group. Downlink signals are transmitted simultaneously to the stations in the set using spatial division multiplexing (SDM).

A portable terminal device in which a case body performs sliding movement has had a problem that a groove may be exposed to the exterior when the case body is opened to a full extent of sliding amount, which will deteriorate grade of the portable terminal device and sealing ability of the case body, permitting dust or the like to enter the cases. In the portable terminal device according to the present invention in which a front side case is adapted to slide with respect to a back side case, a protruding member in a substantially T-shape in cross section is provided on the front side case, and a guide groove frame is provided on the back side case so as to enclose the protruding member, and a track along which the protruding member is adapted to move is defined in the guide groove frame. When the protruding member is positioned at both ends of the guide groove frame, the protruding member and the guide groove frame are arranged in such positional relation that an entire groove region of the guide groove frame is within an opposed range of the front side case. According to this structure, the groove will not be exposed to the exterior in either state where the case body is closed or opened by sliding, intrusion of dust or the like into the groove will be prevented, and sealing ability of the case body can be improved.