公开(公告)号：US4035735A

公开(公告)日：1977-07-12

申请号：US647543

申请日：1976-01-08

申请人： Fumio Akashi ,  Yoichi Sato

发明人： Fumio Akashi ,  Yoichi Sato

IPC分类号： H04L27/34 ,  H04B3/06 ,  H04L25/03 ,  H04L27/22 ,  H03D1/06

CPC分类号： H04L25/03127

摘要： A demodulator responsive to baseband signals from a coherent detector having an automatic equalizer part for supplying equalized signals to derive transmitted datum and a phase control part responsive to equalized signals. The automatic equalizer part includes a delay member with a plurality of taps and variable attenuators connected to the respective taps of the delay member. The phase control part is provided with a phase shift circuit such as a coherent detector and a control circuit for detecting phase variation components of equalized signals. Further, the control circuit feeds phase variation components detected to the phase shift circuit and simultaneously supplies error signals which are dependent on phase variation components to the respective variable attenuators of the automatic equalizer.

摘要翻译： 响应来自具有自动均衡器部分的相干检测器的基带信号的解调器，用于提供均衡信号以导出传输的数据，以及响应于均衡信号的相位控制部分。 自动均衡器部分包括具有连接到延迟部件的各个抽头的多个抽头和可变衰减器的延迟部件。 相位控制部分设置有相移检测器和用于检测均衡信号的相位变化分量的控制电路的相移电路。 此外，控制电路将检测到的相位变化分量馈送到相移电路，同时将依赖于相位变化分量的误差信号提供给自动均衡器的各个可变衰减器。

公开(公告)号：US4888767A

公开(公告)日：1989-12-19

申请号：US217090

申请日：1988-07-07

申请人： Yukitsuna Furuya ,  Fumio Akashi

发明人： Yukitsuna Furuya ,  Fumio Akashi

IPC分类号： H04L1/00 ,  H04L1/16 ,  H04L1/18 ,  H04L12/18

CPC分类号： H04L12/1868 ,  H04L1/0061 ,  H04L1/1692 ,  H04L1/1809 ,  H04L1/1835 ,  H04L1/1874 ,  H04L12/189 ,  H04L2001/0093

摘要： In a network wherein all the receive stations connected to a radio link or a bus type wire link are capable of observing information which is being transmitted over the link, a method of allowing each receive station to send back a repeat request signal in multi-station packet communication in which a single transmit station transmits the same message to a plurality of receive stations. The same number of frequencies as packets are used so that a sinusoidal wave having a particular one of the frequencies which is associated with a packet with an error is sent. Alternatively, the same number of time slots as packets are set up so that a burst signal is sent as a repeat request signal in a particular one of the time sots which is associated with information on a packet with an error. Utilizing the fact that the signals to be sent are repeat request signals, the method insures accurate delivery of retransmit request information to the transmit station even if repeat request signals sent back at the same time are in a conflict.

摘要翻译： 在其中连接到无线电链路或总线类型有线链路的所有接收站能够观察通过链路发送的信息的网络中，允许每个接收站在多站中发送重复请求信号的方法 分组通信，其中单个发射台向多个接收站发送相同的消息。 使用与分组相同数量的频率，从而发送具有与具有错误的分组相关联的特定频率的正弦波。 或者，设置与分组相同数量的时隙，使得突发信号作为与具有错误的分组的信息相关联的时间点中的特定一个中的重复请求信号被发送。 利用要发送的信号是重复请求信号的事实，即使同时发送的重复请求信号发生冲突，该方法也确保重发请求信息向发送站的准确传送。

公开(公告)号：US4742512A

公开(公告)日：1988-05-03

申请号：US887003

申请日：1986-07-18

申请人： Fumio Akashi ,  Kazutomo Kobayashi ,  Junji Namiki ,  Kojiro Watanabe

发明人： Fumio Akashi ,  Kazutomo Kobayashi ,  Junji Namiki ,  Kojiro Watanabe

IPC分类号： H04B7/185 ,  H04L12/403 ,  H04L12/56 ,  H04J3/16 ,  H04J3/06

CPC分类号： H04L12/403 ,  H04B7/18528 ,  H04W28/26 ,  H04W4/06 ,  H04W74/06 ,  H04W76/02 ,  H04W84/06

摘要： In a multipoint communication system, first polling signals are sequentially and respectively transmitted to terminal stations on a broadcast channel from a central station, asking a request for reservation without waiting for a reply from the terminal stations. A reservation signal is transmitted on a multiple access channel from a terminal station requesting the reservation to the central station in response to the first polling signal addressed to it. A second polling signal is then transmitted on the broadcast channel in response to the reservation signal and the multiple access channel is reserved for a period of time variable in accordance with the reservation signal. A data signal is transmitted from the terminal station requesting the reservation on the reserved multiple access channel in response to the second polling signal.

摘要翻译： 在多点通信系统中，第一轮询信号依次分别从中央站在广播频道上发送到终端站，请求等待来自终端的回复请求。 响应于寻址到中央站的第一轮询信号，在多址接入信道上从终端请求预约到中心站的预约信号被发送。 然后响应于预留信号在广播信道上发送第二轮询信号，并且多个接入信道被保留用于根据预留信号可变的一段时间。 响应于第二轮询信号，从终端请求预约的数据信号在保留的多址信道上发送。

公开(公告)号：US4500990A

公开(公告)日：1985-02-19

申请号：US484675

申请日：1983-04-13

申请人： Fumio Akashi

发明人： Fumio Akashi

IPC分类号： H04L12/413 ,  H04L12/46 ,  H04L12/56 ,  H04Q9/00

CPC分类号： H04L47/10 ,  H04L12/413 ,  H04L12/46 ,  H04L47/135 ,  H04L47/30

摘要： A data communication device for use either as an interface between a data processing device and a transmission medium of a CSMA/CD network or as a repeater between a CSMA/CD network and an additional data communication network which shares a transmission medium with the CSMA/CD network, sends an obstruction signal towards the CSMA/CD network when an input buffer tends to overflow on storing an input data packet for delivery to the data processing device or for transmission towards the additional data communication network. The obstruction signal is for causing a collision in the CSMA/CD network. The additional data communication network may be plural in number. When the additional data communication networks are CSMA/CD networks, the transmission of data packets thereto is suspended when a collision is detected at the repeater. The transmission is restarted a variable interval after disappearance of the collision. The variable interval corresponds to a weighted random number known in the art.

摘要翻译： 一种用作CSMA / CD网络的数据处理设备和传输介质之间的接口的数据通信设备，或者作为在CSMA / CD网络和附加数据通信网络之间的中继器使用的数据通信设备，CSMA / CD网络，当存储用于传送到数据处理设备的输入数据分组或向附加数据通信网络发送时，当输入缓冲器倾向于溢出时，向CSMA / CD网络发送阻塞信号。 阻塞信号用于引起CSMA / CD网络中的冲突。 附加数据通信网络可以是多个数量的。 当附加数据通信网络是CSMA / CD网络时，当在中继器处检测到冲突时，其数据分组的传输被暂停。 传输在碰撞消失后重新启动一个可变间隔。 可变间隔对应于本领域已知的加权随机数。

公开(公告)号：US4327440A

公开(公告)日：1982-04-27

申请号：US132482

申请日：1980-03-19

申请人： Yukitsuna Furuya ,  Fumio Akashi

发明人： Yukitsuna Furuya ,  Fumio Akashi

IPC分类号： H04B3/06 ,  H04L25/03 ,  H04L25/06 ,  H04L25/08 ,  H04L27/00 ,  H04L27/06 ,  H04L27/38 ,  H03K13/34

CPC分类号： H04L25/062 ,  H04L25/061 ,  H04L27/06 ,  H04L27/38

摘要： A signal detector for use in the digital signal communication, comprising a tentative decision means for assigning certain symbols to receiving signals based on a predetermined value; a first memory means for storing the output of said tentative decision means in sequence; a second memory means for storing a plurality of reference values prepared in association with all the signals to be received, said signals corresponding to the symbol sequence assigned by said first memory means; a selection means for selecting at least one of said reference values based on at least a part of the contents of said first memory; and a processing means wherein there is proceeded by using said selected reference value the process to relate said receiving signals with signals to be received that are most likely receiving signals among all the signals to be received, thereby producing output.

摘要翻译： 一种用于数字信号通信的信号检测器，包括用于基于预定值将某些符号分配给接收信号的暂定判定装置; 用于依次存储所述暂定决定装置的输出的第一存储装置; 第二存储装置，用于存储与要接收的所有信号相关联地准备的多个参考值，所述信号对应于由所述第一存储装置分配的符号序列; 选择装置，用于基于所述第一存储器的内容的至少一部分来选择所述参考值中的至少一个; 以及处理装置，其中通过使用所述选择的参考值进行所述接收信号与要接收的所有信号中最可能接收信号的待接收信号相关联的处理，从而产生输出。