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    • 46. 发明授权
    • Wireless data communication system, wireless data communication method and communication apparatus
    • 无线数据通信系统,无线数据通信方式和通信装置
    • US07209765B1
    • 2007-04-24
    • US11493821
    • 2006-07-27
    • Shigenori HayaseShinji MuraiTomoaki Ishifuji
    • Shigenori HayaseShinji MuraiTomoaki Ishifuji
    • H04Q7/20
    • H04B7/0617
    • A wireless communication system has no limitation in the number of AP antennas and UT antennas, and determines the parallel-communication data units to be a maximum value of MIMO communication, such that it provides a MIMO-SDMA wireless data communication system having superior transmission characteristics. The MIMO-SDMA wireless data communication system includes a single AP (Access Point) and U UTs (User Terminals) communicating with the AP using the same frequency signal at the same time. The UT includes the SDMA reception (Rx) processor, and synthesizes Rx signals of antennas, such that it controls the number of Rx data units. By the control of the number of Rx data units, the communication system controls the number of parallel-communication data units to be equal to a maximum value capable of being implemented by the MIMO-SDMA wireless data communication. The AP informs the UTs of a coefficient matrix required for the SDMA Rx process, prior to transmitting actual data.
    • 无线通信系统对AP天线和UT天线的数量没有限制,并且将并行通信数据单元确定为MIMO通信的最大值,使得其提供具有优异传输特性的MIMO-SDMA无线数据通信系统 。 MIMO-SDMA无线数据通信系统包括使用相同频率信号同时与AP通信的单个AP(接入点)和U UT(用户终端)。 UT包括SDMA接收(Rx)处理器,并且合成天线的Rx信号,使得它控制Rx数据单元的数量。 通过控制Rx数据单元的数量,通信系统将并行通信数据单元的数量控制为能够通过MIMO-SDMA无线数据通信实现的最大值。 在发送实际数据之前,AP向UT通知SDMA Rx进程所需的系数矩阵。
    • 47. 发明授权
    • Boom positioning device for high-position working
    • US06554144B2
    • 2003-04-29
    • US10130303
    • 2002-05-31
    • Yukio HashiguchiShinji MuraiShinichi Ishikawa
    • Yukio HashiguchiShinji MuraiShinichi Ishikawa
    • B66C1344
    • H02G1/02B60M1/28B66F11/044
    • A boom positioning device for high-position working, capable of ensuring a desired positional accuracy even in positioning a work location at the tip end of a boom from a distant place, the device comprising an imaging means (4) having a multi-axis driving unit and provided with a boom tip-end position computing means (2) for computing the position and attitude of the boom tip-end from positions of respective axes of the boom detected by a boom respective-axis-position detecting means (1) and with a distance measuring means (3) for detecting the distance from the boom tip-end position to a work object, a first boom working amount calculating means (11) for calculating, from an output from the distance measuring means (3) and an output from a measuring error judging means (10), a boom working amount up to an approach enabled area where the measuring accuracy of the distance measuring means (3) is guaranteed, and a second boom working amount calculating means (15) for calculating, from a distance from the boom tip-end position detected by the distance measuring means (3) up to a work object and from a specified work location and boom tip-end position with respect to the work object in the approach enabled area, a boom working amount up to a specified work location with respect to the work object.