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    • 31. 发明授权
    • ADPLL frequency synthesizer
    • ADPLL频率合成器
    • US08130892B2
    • 2012-03-06
    • US12171800
    • 2008-07-11
    • Kenji Takahashi
    • Kenji Takahashi
    • H03D3/24H03L7/00
    • H03L7/085H03L7/093H03L7/0991H03L2207/04H03L2207/50
    • In an ADPLL frequency synthesizer where a frequency control word is changed from FCW0 to FCW2, a control sensitivity estimation section firstly measures oscillatory frequencies f1L and f1H obtained, respectively, when frequency control words FCW1L and FCW1H being used as dummies are set, and then measures an oscillatory frequency f2 obtained when a frequency control word FCW2 is set. Thereafter, based on values of the oscillatory frequencies f1L, f1H and f2, the control sensitivity estimation section calculates a control sensitivity KDCO2 obtained when the frequency control word FCW2 is set. Based on a value of the control sensitivity KDCO2, the loop filter determines values of filter coefficients α2 and ρ2 so as to be equal to a natural frequency ωn and a damping factor ζ, respectively, both of which have been previously designed.
    • 在频率控制字从FCW0变为FCW2的ADPLL频率合成器中,控制灵敏度估计部分首先测量当用作虚拟变量的频率控制字FCW1L和FCW1H时分别获得的振荡频率f1L和f1H,然后测量 当频率控制字FCW2被设置时获得的振荡频率f2。 此后,基于振荡频率f1L,f1H和f2的值,控制灵敏度估计部分计算设置频率控制字FCW2时获得的控制灵敏度KDCO2。 基于控制灵敏度KDCO2的值,环路滤波器将滤波器系数α2和&rgr2的值确定为分别等于先前设计的固有频率ωn和阻尼因子ζ。
    • 38. 发明授权
    • User authentication system for providing online services based on the transmission address
    • 用户认证系统,用于根据传输地址提供在线业务
    • US07861288B2
    • 2010-12-28
    • US10534541
    • 2004-07-12
    • Yukio TsuruokaYoshinao KikuchiShintaro MizunoKenji TakahashiKei Karasawa
    • Yukio TsuruokaYoshinao KikuchiShintaro MizunoKenji TakahashiKei Karasawa
    • H04L29/06
    • H04L63/061H04L9/0866H04L9/3213H04L9/3271H04L29/12216H04L61/2007H04L63/0442H04L63/0807H04L2209/56H04L2209/80
    • An address allocated to a user by an authentication server is used as an IP address of a packet which is transmitted from a user terminal, preventing an illicit use if the IP address were eavesdropped. An authentication server 100 performs an authentication of a user based on a user authentication information which is transmitted from the user terminal, and upon a successful authentication, allocates an address to the user terminal, and issues a ticket containing the address to be returned to the user terminal. The user terminal sets up the address contained in the ticket as a source address, and transmits the ticket to the application server 300, requesting a session to be established. After verifying that the ticket is authentic, the server 300 stores the ticket and establishes a session with the user terminal. The user terminal transmits a service request packet containing the source address to the server 300 utilizing the session. If the source address coincides with the address contained in the stored ticket, the server 300 provides a service to the user.
    • 使用由认证服务器分配给用户的地址作为从用户终端发送的分组的IP地址,如果IP地址被窃听,则防止非法使用。 认证服务器100基于从用户终端发送的用户认证信息来执行用户的认证,成功认证后,向用户终端分配地址,并发送包含要返回的地址的票据 用户终端。 用户终端将包含在票中的地址设置为源地址,并将票据发送到应用服务器300,请求建立会话。 在验证票证是真实的之后,服务器300存储票据并与用户终端建立会话。 用户终端利用会话向服务器300发送包含源地址的服务请求包。 如果源地址与存储的票证中包含的地址一致,则服务器300向用户提供服务。