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1.发明授权
公开(公告)号：US5574737A
公开(公告)日：1996-11-12
申请号：US53803
申请日：1993-04-29
申请人： Yasunao Mizutani , Takashi Kaku
发明人： Yasunao Mizutani , Takashi Kaku
摘要： A modulator-demodulator device includes a transmitter side having an error control coding circuit for adding redundancy to a bit sequence to be transmitted from a bit processing circuit and coding the bit sequence. A data sequence to coordinate transforming circuit transforms the bit sequence from the error control circuit into a signal point coordinate on a complex plane. A coordinate rotating circuit rotates the transformed signal point coordinates based on frame phase information from a frame phase generating circuit. In the receiver side, a coordinate rotating circuit applies rotation in a direction reverse that of the transmitter coordinate rotating circuit based on the frame phase information from the frame phase generating circuit. A second decision circuit decides the maximum likelihood signal point by utilizing the redundancy added by the error control coding circuit of the transmitter side and correcting the coordinate error of the received signal point. An unsynchronized frame state deciding circuit decides the unsynchronized frame state based on the distance between the decision point determined by the maximum likelihood signal point deciding circuit and the demodulated received signal point on the complex plane, so that the synchronized frame state is quickly detected. An evaluation value is designated for each of the transition sequence of signals, and in the receiver side, error control signal decoding is carried out so that the transition sequence of the maximum likelihood received signal is selected based on the updated evaluation value and the error in the demodulated signal is corrected, so that the error in the data transmission is corrected.
摘要翻译： 调制器 - 解调器装置包括发射机侧，发射机侧具有用于将比特序列从比特处理电路发送的比特序列加上冗余的错误控制编码电路，并对该比特序列进行编码。 坐标变换电路的数据序列将位序列从误差控制电路变换为复平面上的信号点坐标。 坐标旋转电路基于来自帧相位产生电路的帧相位信息来旋转经变换的信号点坐标。 在接收侧，基于来自帧相位产生电路的帧相位信息，坐标旋转电路沿与发送器坐标旋转电路相反的方向施加旋转。 第二判定电路利用由发送器侧的误差控制编码电路所附加的冗余来校正接收信号点的坐标误差来决定最大似然信号点。 不同步的帧状态决定电路基于由最大似然信号点判定电路决定的判定点与复平面上的解调接收信号点之间的距离来决定不同步的帧状态，从而快速检测同步的帧状态。 针对每个信号的转换序列指定评估值，在接收机侧，执行错误控制信号解码，使得根据更新后的评估值和误差来选择最大似然接收信号的转换序列 解调信号被校正，从而校正数据传输中的误差。
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公开(公告)号：US5572537A
公开(公告)日：1996-11-05
申请号：US53804
申请日：1993-04-29
申请人： Yasunao Mizutani , Takashi Kaku
发明人： Yasunao Mizutani , Takashi Kaku
摘要： A modulator-demodulator device includes a transmitter side having an error control coding circuit for adding redundancy to a bit sequence to be transmitted from a bit processing circuit and coding the bit sequence. A data sequence to coordinate transforming circuit transforms the bit sequence from the error control circuit into a signal point coordinate on a complex plane. A coordinate rotating circuit rotates the transformed signal point coordinates based on frame phase information from a frame phase generating circuit. In the receiver side, a coordinate rotating circuit applies rotation in a direction reverse that of the transmitter coordinate rotating circuit based on the frame phase information from the frame phase generating circuit. A second decision circuit decides the maximum likelihood signal point by utilizing the redundancy added by the error control coding circuit of the transmitter side and correcting the coordinate error of the received signal point. An unsynchronized frame state deciding circuit decides the unsynchronized frame state based on the distance between the decision point determined by the maximum likelihood signal point deciding circuit and the demodulated received signal point on the complex plane, so that the synchronized frame state is quickly detected. An evaluation value is designated for each of the transition sequence of signals, and in the receiver side, error control signal decoding is carried out so that the transition sequence of the maximum likelihood received signal is selected based on the updated evaluation value and the error in the demodulated signal is corrected, so that the error in the data transmission is corrected.
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公开(公告)号：US5319650A
公开(公告)日：1994-06-07
申请号：US635520
申请日：1991-02-13
申请人： Yasunao Mizutani , Takashi Kaku
发明人： Yasunao Mizutani , Takashi Kaku
摘要： In a modulator-demodulator device, in the transmitter side an error control coding unit is provided for adding redundancy according to a predetermined procedure to a bit sequence to be transmitted from bit processing unit to code the bit sequence. A data sequence-to-coordinate transforming unit transforms the bit sequence from the error control coding unit into a coordinate of a signal point on a complex plane. A coordinate rotating unit rotates the transformed signal point coordinates based on the frame phase information from a frame phase generating unit. In the receiver side, a coordinate rotating unit applies the rotation in the reverse direction of that of the coordinate rotating unit of the transmitter side based on the frame phase information from the frame phase generating unit. A the second unit determines the maximum likelihood signal point by utilizing the redundancy added by the error control coding unit of the transmitter side and corrects the coordinate error of the received signal point. An unsynchronized frame state determining unit determines the unsynchronized frame state based on the distance between the decision point determined by the maximum likelihood signal point determining unit and the demodulated received signal point on the complex plane, whereby the synchronized frame state is quickly detected. In the modulator-demodulator device, an evaluation value is designated for each of the transition sequence of signals. In the receiver side, an error control signal decoding is carried out in the manner that the transition sequence of the maximum likelihood received signal is selected based on the updated evaluation value and the error in the demodulated signal is corrected, whereby the error in the data transmission is corrected.
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4.发明授权Radio communication system and control method, and information processing apparatus used therein 失效无线电通信系统和控制方法以及其中使用的信息处理装置公开(公告)号：US06724731B1
公开(公告)日：2004-04-20
申请号：US09093734
申请日：1998-06-09
申请人： Tomoki Shibasaki , Yasunao Mizutani
发明人： Tomoki Shibasaki , Yasunao Mizutani
IPC分类号： G01R3108
摘要： A radio communication system control method, a radio communication system, and an information processing apparatus used therein is one where system a server and terminals are linked via a plurality of base stations. The radio communication system is configured to prevent communication errors. When the link between a server and a base station is disconnected, the server detects the disconnection, and transmits, to a base station adjacent to the base station, a power supply off command for disconnecting the power supply in the base station. By transmitting the command to the base station via the base station, the server disconnects the power supply in the base station and stops the communication between the base station and a radio terminal apparatus.
摘要翻译： 其中使用的无线电通信系统控制方法，无线电通信系统和信息处理装置是通过多个基站来连接服务器和终端的系统。 无线电通信系统被配置为防止通信错误。 当服务器和基站之间的链路断开时，服务器检测到断开，并将与基站相邻的基站发送给用于断开基站中的电源的电源断开命令。 通过经由基站向基站发送命令，服务器断开基站的电源，停止基站与无线终端装置的通信。
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5.发明授权Call collision sidestep system for two-way simultaneous calls in an ISDN network 失效呼叫冲突回避系统，用于ISDN网络中的双向并发呼叫
公开(公告)号：US5381415A
公开(公告)日：1995-01-10
申请号：US87351
申请日：1993-07-08
申请人： Yasunao Mizutani
发明人： Yasunao Mizutani
CPC分类号： H04Q11/0428 , H04M3/42 , H04M3/42059 , H04M3/42102
摘要： A method of controlling a network including first and second terminals connected to the network. The method responds to a call collision state in which the first terminal transmits a corresponding connect request to the network for connection to the second terminal and, simultaneously, the second terminal transmits a corresponding connect request to the network for connection to the first terminal. The method includes the steps of withdrawing from the network the corresponding connect request from one of the first terminal and the second terminal while maintaining the corresponding connect request from the other of the first and second terminals; transmitting a relayed connect request from the network to the one of the first terminal and the second terminal for which the connect request was withdrawn; transmitting a connect allowance signal from the network to the one of the first and second terminals for which the connect request was maintained; and connecting the first terminal and the second terminal together through the network.
摘要翻译： 一种控制网络的方法，包括连接到网络的第一和第二终端。 该方法响应呼叫冲突状态，其中第一终端向网络发送对应的连接请求以连接到第二终端，并且同时，第二终端向网络发送对应的连接请求以连接到第一终端。 该方法包括以下步骤：从第一终端和第二终端中的一个终端从网络退出相应的连接请求，同时保持来自第一和第二终端中的另一终端的对应连接请求; 从所述网络向所述连接请求被撤回的所述第一终端和所述第二终端中的一个发送中继连接请求; 从所述网络向所述连接请求被维护的所述第一和第二终端中的一个发送连接允许信号; 以及通过网络将第一终端和第二终端连接在一起。
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