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1. 发明授权

US06483825B2 Time synchronization method in CDMA system 失效
标题翻译： CDMA系统中的时间同步方法
公开(公告)号：US06483825B2
公开(公告)日：2002-11-19
申请号：US09236962
申请日：1999-01-25
申请人： Mitsuru Seta
发明人： Mitsuru Seta
IPC分类号： H04B700
CPC分类号： H04B7/2693 , H04H20/67
摘要： A time synchronization method in a CDMA system for synchronizing the time of a plurality of base stations and the time of a base station controller that controls each of these base stations includes providing the base station controller with a GPS receiver for receiving a signal from GPS satellites and generating a reference time based upon the received signal, adopting the reference time generated by the GPS receiver as the time of the base station controller, creating time reference information based upon this time and sending the time reference information to each base station. Each base station synchronizes its own time to the that of the base station controller based upon the time reference information it has received.
摘要翻译：用于同步多个基站的时间的CDMA系统中的时间同步方法和控制这些基站中的每一个的基站控制器的时间包括向基站控制器提供用于从GPS卫星接收信号的GPS接收机并且基于接收到的信号生成基准时间，采用由GPS接收机产生的基准时间作为基站控制器的时间，基于该时间创建时间参考信息，并将时间参考信息发送给每个基站。每个基站根据其接收到的时间参考信息，将自己的时间与基站控制器的时间同步。

2. 发明授权

US5574785A Enciphered communication system 失效
标题翻译：加密通信系统
公开(公告)号：US5574785A
公开(公告)日：1996-11-12
申请号：US365915
申请日：1994-12-29
申请人： Tomoyuki Ueno , Mitsuru Seta
发明人： Tomoyuki Ueno , Mitsuru Seta
IPC分类号： G09C1/00 , H04L9/08 , H04L9/14 , H04L9/00
CPC分类号： H04L9/0891 , H04L9/14 , H04L2209/34
摘要： An enciphered communication system is provided which has a plurality of cipher keys selectively used for enciphering data, wherein even when a cipher key number used at a transmitting side is not correctly transmitted to a receiving side, the receiving side can change the cipher key to a correct one. A transmitter has appendant data affixing means for affixing appendant data to information to be enciphered, and a receiver has appendant data detecting means for detecting the appendant data from deciphered data, and cipher key determining means for successively changing the cipher key of the receiver when the appendant data is not accurately detected. Consequently, when the cipher key is changed, for example, the receiving side itself can restore data even if the cipher key number is not correctly transmitted thereto.
摘要翻译：提供了一种加密通信系统，其具有选择性地用于加密数据的多个密码密钥，其中即使当在发送侧使用的密码密钥号码未被正确地发送到接收方时，接收方可以将密码密钥更改为正确的一个。发送机具有用于将附加数据附加到要被加密的信息的附属数据附加装置，并且接收机具有用于从解密数据中检测附加数据的附属数据检测装置，以及当密码密钥确定装置在没有准确检测到附属资料。因此，当密码密钥改变时，例如，即使加密密钥号码未被正确传送，接收方本身也可以恢复数据。

3. 发明授权

US06175747B1 Base transceiver station and subscriber unit in wireless local loop system using personal handy-phone system and method for operating same 失效
标题翻译：使用个人手机系统的无线本地环路系统中的基站收发台和用户单元及其操作方法
公开(公告)号：US06175747B1
公开(公告)日：2001-01-16
申请号：US08821627
申请日：1997-03-20
申请人： Yasuo Tanishima , Rikihiko Mashima , Atsushi Yamashita , Hiroyuki Sogo , Mitsuru Seta , Hitoshi Ishikawa , Tsudoi Kubo , Masahiko Shirota , Yutaka Hamada
发明人： Yasuo Tanishima , Rikihiko Mashima , Atsushi Yamashita , Hiroyuki Sogo , Mitsuru Seta , Hitoshi Ishikawa , Tsudoi Kubo , Masahiko Shirota , Yutaka Hamada
IPC分类号： H04B138
CPC分类号： H04B1/54 , H04Q11/0442 , H04Q2213/13034 , H04Q2213/13098 , H04Q2213/13106 , H04Q2213/13162 , H04Q2213/13166 , H04Q2213/13167 , H04Q2213/13209 , H04Q2213/13292 , H04Q2213/13298 , H04Q2213/13305 , H04Q2213/1332 , H04Q2213/13322 , H04Q2213/1334
摘要： A base transceiver station in a wireless local loop system using a personal handy-phone system constituted by a plurality of cell stations, each accommodating a plurality of subscriber units, a hybrid section integrally handling signals transmitted and received by the plurality of cell stations via a single antenna, and a multiplexing/demultiplexing unit integrally handling the signals transferred between the plurality of cell stations and an existing network, thereby enabling construction of a wireless local loop system which is small in size, can expand the service area without an increase of interference with other base transceiver stations, has a good affinity with existing networks, is provided with ISDN functions, and, at the same time, provides backup against faults and improves the transmission quality and reliability.
摘要翻译：一种无线本地环路系统中的基地收发台，其使用由容纳多个用户单元的多个小区站构成的个人便携式电话系统，综合处理由多个小区站发送和接收的信号的混合部分，单一天线，以及综合处理在多个小区站之间传输的信号与现有网络的复用/解复用单元，由此能够构建小型的无线本地环路系统，可以在不增加干扰的情况下扩展服务区域与其他基站收发台，与现有网络具有良好的相似性，提供ISDN功能，同时提供故障备份，提高传输质量和可靠性。

4. 发明授权

US5563537A Frequency-controlled circuit 失效
标题翻译：频率控制电路
公开(公告)号：US5563537A
公开(公告)日：1996-10-08
申请号：US512442
申请日：1995-08-08
申请人： Mitsuru Seta
发明人： Mitsuru Seta
IPC分类号： H03J7/18 , H03J7/02 , H04B1/26 , H04L27/00 , H04L27/22 , H04L27/227 , H04L27/233 , H04L27/14
CPC分类号： H03J7/02 , H04L27/227 , H04L27/2332 , H04L2027/0028 , H04L2027/0055 , H04L2027/0057 , H04L2027/0079 , H04L2027/0093
摘要： A frequency-controlled circuit for automatically detecting a center frequency of a received signal whose frequency is shifted includes a frequency control unit for receiving the input signal and changing the frequency of the received signal into another frequency, a demodulating unit for demodulating a signal outputted from the frequency control unit, an incoming detecting unit for detecting whether a demodulated signal outputted from the demodulating unit is proper or improper and a level detecting unit for dividing a frequency band of the signal, obtained in the frequency control unit by adding a receive frequency band of the received signal to the center frequency of the received signal or subtracting the center frequency thereof from the receive frequency band thereof, into a plurality of narrower frequency bands and detecting respective power values of the divided frequency bands. A center-frequency determining unit detects the maximum value from the power values detected by the level detecting unit and outputs information about the divided frequency band having the detected maximum power value. A sweep/de-sweep control unit is provided, which allows the frequency control unit to sweep the received signal at a frequency bandwidth corresponding to the information about the divided frequency bands.
摘要翻译：用于自动检测其频移的接收信号的中心频率的频率控制电路包括用于接收输入信号并将接收信号的频率改变为另一频率的频率控制单元，解调单元，用于解调从频率控制单元，用于检测从解调单元输出的解调信号是正确还是不正确的输入检测单元;以及电平检测单元，用于通过将频率控制单元中获得的频带的接收频带将接收信号的接收信号与接收信号的中心频率或从其接收频带减去其中心频率分配成多个较窄的频带并检测分频频带的各个功率值。中心频率确定单元根据由电平检测单元检测的功率值检测最大值，并输出关于具有检测到的最大功率值的分频带的信息。提供扫频/去扫频控制单元，其允许频率控制单元以对应于分频频带的信息的频率带宽扫描接收信号。

5. 发明授权

US5301194A Packet re-transmitting system for satellite communication system of the slotted-aloha type 失效
标题翻译：用于卫星通信系统的分组重传系统
公开(公告)号：US5301194A
公开(公告)日：1994-04-05
申请号：US890180
申请日：1992-05-29
申请人： Mitsuru Seta
发明人： Mitsuru Seta
IPC分类号： H04B7/212 , H04B7/185 , H04L1/14 , H04L7/04
CPC分类号： H04B7/18528
摘要： The present invention provides a packet re-transmitting system for a slotted-ALOHA type satellite communication system wherein communications are effected between a central office and a large number of local offices by way of a communications satellite and which decreases a packet re-transmitting time remarkably. The central office transmits a frame synchronizing signal, manages a reception slot number in a predetermined phase relationship with the frame synchronizing signal, detects a condition of a reception signal from any of the local offices and sends back a receiving condition signal including a reception slot number and detection information of a receiving condition at the point of time. Each of the local offices manages a transmission slot number in a predetermined phase relationship with a received frame synchronizing signal, compares a transmission slot number at a point of time when a packet was transmitted with a reception slot number in the receiving condition signal and re-transmits, when the transmission slot number corresponds to the reception slot number in the receiving condition signal and detection information of a received condition indicates irregularity, the transmission packet.
摘要翻译：本发明提供了一种用于时隙ALOHA型卫星通信系统的分组重传系统，其中通过通信卫星在中心局和大量本地办公室之间进行通信，并且显着地减少了分组重发时间。中心局发送帧同步信号，以与帧同步信号规定的相位关系管理接收时隙号，检测来自任何本地局的接收信号的状况，并发送包括接收时隙号以及在时间点的接收条件的检测信息。每个本地办公室以与接收的帧同步信号预定的相位关系管理传输时隙号，将在发送分组的时间点的发送时隙号与接收条件信号中的接收时隙号进行比较，当发送时隙号对应于接收条件信号中的接收时隙号和接收到的条件的检测信息表示不规则时，发送发送包。

6. 发明授权

US5886999A Receiving apparatus and method of outputting received signal in multimedia communication 失效
标题翻译：在多媒体通信中输出接收信号的接收装置和方法
公开(公告)号：US5886999A
公开(公告)日：1999-03-23
申请号：US695670
申请日：1996-08-08
申请人： Jun Kojima , Mitsuru Seta , Tomoyuki Ueno
发明人： Jun Kojima , Mitsuru Seta , Tomoyuki Ueno
IPC分类号： H04N7/14 , H04J3/04 , H04J3/06 , H04J3/22 , H04L1/00 , H04L1/20 , H04L7/08 , G06F11/00
CPC分类号： H04J3/047 , H04J3/0602 , H04L1/0045 , H04L1/20
摘要： A demultiplexer separates the data obtained by the demodulation into the data for each information medium, and a synchronous word detection state monitor detects the synchronous word contained in a received signal of a predetermined information medium and compares the state in which said synchronous word is detected with the preset standard, and outputs an output stop signal when the synchronous word detection state is worse then the preset standard.An error-correction decoder subjects the data obtained by the demodulation to an error-correction decoding processing, and an error-correction encoder subjects the decoded data to an error-correction encoding processing. A line quality estimating portion estimates the quality of the line by comparing the data obtained by the error-correction encoding processing with the demodulated data before decoding and an output controller stops outputting the received signal to the external terminal when the line quality is worse than the reference quality.
摘要翻译：解复用器将通过解调获得的数据分离成每个信息介质的数据，并且同步字检测状态监视器检测包含在预定信息介质的接收信号中的同步字，并将检测到所述同步字的状态与预设标准，当同步字检测状态比预设标准差时，输出输出停止信号。纠错解码器将通过解调获得的数据进行纠错解码处理，并且纠错编码器对经解码的数据进行纠错编码处理。线路质量估计部分通过将通过纠错编码处理获得的数据与解码之前的解调数据进行比较来估计线路的质量，并且当线路质量差于线路质量差时，输出控制器停止向外部终端输出接收信号参考质量。

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