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    Systems and methods for wireless communication
    2.
    发明公开
    Systems and methods for wireless communication 有权
    Systeme und Verfahren zur drahtlosen Kommunikation

    公开(公告)号：EP1863304A1

    公开(公告)日：2007-12-05

    申请号：EP07008981.8

    申请日：2007-05-03

    申请人： Hitachi, Ltd.

    发明人： Murai, Shinji ,  Ishifuji, Tomoaki ,  Yano, Takashi ,  Shida, Masaaki ,  Hayase, Shigenori

    IPC分类号： H04Q7/36

    CPC分类号： H04W72/085 ,  H04W28/18 ,  H04W72/046

    摘要： In a wireless communication system (FIG. 1) for communicating with a plurality of stations (103) at the same point of time with the same frequency using a Space Division Multiple Access (SDMA), wireless resources are allocated by a first decision unit (206-c) which evaluates performance of each station obtained when the SDMA is used and which determines periods of time to be allocated to groups of stations formed according to the SDMA technique. Using a first evaluation unit (206-a) and a second evaluation unit (206-b) to evaluate performance required by each station and each application, the first decision unit allocates the wireless resources to the stations. It is therefore possible that the wireless resources are efficiently allocated to the stations while preventing an event in which the wireless resources are excessive or insufficient for required quality of service (QoS; FIG. 7).

    摘要翻译： 在用于使用空分多址（SDMA）以相同频率在同一时间点与多个站（103）进行通信的无线通信系统（图1）中，无线资源由第一决策单元 206-c），其评估当使用SDMA时获得的每个站的性能，并且确定要分配给根据SDMA技术形成的站组的时间段。 使用第一评估单元（206-a）和第二评估单元（206-b）来评估每个站点和每个应用所要求的性能，第一决策单元向站点分配无线资源。 因此，可以将无线资源有效地分配给站，同时防止无线资源过多或不足以满足所需服务质量（QoS;图7）的事件。

    Communication method of contactless ID card and integrated circuit used therein
    7.
    发明公开
    Communication method of contactless ID card and integrated circuit used therein 有权
    Übertragungsverfahreneiner kontaktlosen ID-Karte und darin benutzte integrierte Schaltung

    公开(公告)号：EP0967562A3

    公开(公告)日：2003-05-07

    申请号：EP99110563.6

    申请日：1999-06-01

    申请人： Hitachi, Ltd.

    发明人： Tanaka, Satoshi ,  Ishifuji, Tomoaki ,  Nagai, Kenji ,  Furukawa, Katsuhiro

    IPC分类号： G06K7/00 ,  H04L25/49 ,  G06K19/07

    CPC分类号： G06K7/0008 ,  H04L25/4904

    摘要： The code system is realized by that a plurality of waveforms A and B each having duty ratios of 50% in which only any one of a rising edge and a falling edge is present are combined with each other, and "1" and "0" are allocated to the combined waveform. In accordance with the present invention, both a clock and data can be transmitted at the same time, and can be readily demodulated without using a complex PLL circuit. As a trial manufacture according to the present invention, the demodulator could be realized which could allow variations contained in an input frequency by more than 1 digit under operating voltage of 2 V. The effectiveness of this patent could be confirmed.

    摘要翻译： 代码系统是通过以下方式实现的：每个占空比为50％的多个波形A和B，其中仅存在上升沿和下降沿中的任何一个，“1”和“0” 被分配给组合波形。 根据本发明，可以同时发送时钟和数据，并且可以容易地解调而不使用复合PLL电路。 作为根据本发明的试制，可以实现解调器，其可以在2V的工作电压下允许输入频率中包含的变化大于1位。可以确认该专利的有效性。

    Communication method of contactless ID card and integrated circuit used therein
    8.
    发明公开
    Communication method of contactless ID card and integrated circuit used therein 有权
    Übertragungsverfahren

    公开(公告)号：EP0967562A2

    公开(公告)日：1999-12-29

    申请号：EP99110563.6

    申请日：1999-06-01

    申请人： Hitachi, Ltd.

    发明人： Tanaka, Satoshi ,  Ishifuji, Tomoaki ,  Nagai, Kenji ,  Furukawa, Katsuhiro

    IPC分类号： G06K7/00 ,  H04L25/49

    CPC分类号： G06K7/0008 ,  H04L25/4904

    摘要： The code system is realized by that a plurality of waveforms A and B each having duty ratios of 50% in which only any one of a rising edge and a falling edge is present are combined with each other, and "1" and "0" are allocated to the combined waveform. In accordance with the present invention, both a clock and data can be transmitted at the same time, and can be readily demodulated without using a complex PLL circuit. As a trial manufacture according to the present invention, the demodulator could be realized which could allow variations contained in an input frequency by more than 1 digit under operating voltage of 2 V. The effectiveness of this patent could be confirmed.

    摘要翻译： 代码系统是通过以下方式实现的：每个占空比为50％的多个波形A和B，其中仅存在上升沿和下降沿中的任何一个，“1”和“0” 被分配给组合波形。 根据本发明，可以同时发送时钟和数据，并且可以容易地解调而不使用复合PLL电路。 作为根据本发明的试制，可以实现解调器，其可以在2V的工作电压下允许输入频率中包含的变化大于1位。可以确认该专利的有效性。