公开(公告)号：US06314133B1

公开(公告)日：2001-11-06

申请号：US09243565

申请日：1999-02-03

申请人： Yoshikazu Kakura ,  Tomoki Ohsawa

发明人： Yoshikazu Kakura ,  Tomoki Ohsawa

IPC分类号： H04L2701

CPC分类号： H04L7/0054 ,  H04L25/03038 ,  H04L2025/03477

摘要： An automatic equalizer has a sampling-clock producing arrangement which is for, before selecting a sample timing, producing a sampling clock at the rate of L times of that after selecting, and after selecting the sample timing, producing a tap-coefficient selection signal according to the sample timing, and a sampling clock at the rate of 1/L times of that before selecting, according to the sample timing. In the sampling-clock producing arrangement, demodulation components are obtained in absolute values of impulse-response signals with respect to L sample timings, respectively. A selecting arrangement selects the sample timing by the use of the demodulation components. The impulse-response signals are produced in response to a sampled received-signal obtained by sampling a received signal with the sampling clock.

摘要翻译： 自动均衡器具有采样时钟产生装置，用于在选择采样定时之前，以选择后的L倍的速率产生采样时钟，并且在选择采样定时之后，产生抽头系数选择信号，根据 根据采样定时，采样时钟以选择之前的1 / L倍的速率进行采样。 在采样时钟产生装置中，分别获得关于L个采样定时的脉冲响应信号的绝对值的解调分量。 选择装置通过使用解调分量来选择采样定时。 脉冲响应信号响应于通过采样时钟对接收信号进行采样而获得的采样接收信号产生。

公开(公告)号：US06292510B1

公开(公告)日：2001-09-18

申请号：US09253244

申请日：1999-02-19

申请人： Yoshikazu Kakura ,  Kazuhiro Okanoue ,  Tomoki Ohsawa

发明人： Yoshikazu Kakura ,  Kazuhiro Okanoue ,  Tomoki Ohsawa

IPC分类号： H03H730

CPC分类号： H04L25/03197

摘要： An automatic equalizer comprises a transmission symbol sequence generation circuit 101, a parallel received signal estimation circuit 102, subtracters 103-1 through 103-6, absolute value squaring arithmetic circuits 104-1 through 104-6, adders 105-1 through 105-4, and a discriminator 106. Maximum likelihood estimation can be performed with simple operations by means of using added error signals given by adding square error signals obtained from estimated error signals for an N number of delayed received signals delayed by a time instant corresponding to 0 through (N−1) symbols, to select the transmission symbol sequence having the smallest error.

摘要翻译： 自动均衡器包括发送符号序列产生电路101，并行接收信号估计电路102，减法器103-1至103-6，绝对值平方运算电路104-1至104-6，加法器105-1至105-4 以及鉴别器106.可以通过简单的操作，通过使用添加的误差信号来执行最大似然估计，所述附加误差信号通过将对从0延迟的时间延迟的N个延迟接收信号的估计误差信号所获得的平方误差信号加到 （N-1）个符号，以选择具有最小误差的传输符号序列。

公开(公告)号：US06731669B1

公开(公告)日：2004-05-04

申请号：US09526055

申请日：2000-03-15

申请人： Hikaru Kudoh ,  Tomoki Ohsawa

发明人： Hikaru Kudoh ,  Tomoki Ohsawa

IPC分类号： H04B1713

CPC分类号： H04B1/7156 ,  H04B2001/71563

摘要： The station selects a communication frequency of the station among the hopping frequencies, and then, receives, as reception frames, the frames, which are transmitted from the access points through the selected communication frequency. The station extracts the control frames from the reception frames, and monitors the extracted control frames during a monitoring time interval. After that, the station determines the selected access point, on the basis of the results of the monitoring. And also, the station synchronizes itself with the selected access point on the basis of information included in the extracted control frames, together with the dwell time assigned for the selected access point.

摘要翻译： 该台站在跳频之间选择站的通信频率，然后，通过选择的通信频率接收从接入点发送的帧作为接收帧。 站从接收帧中提取控制帧，并在监视时间间隔内监视所提取的控制帧。 之后，车站根据监控结果确定选定的接入点。 并且，基于所提取的控制帧中包括的信息，站与所选择的接入点分配的驻留时间一起，站自身与所选择的接入点同步。

公开(公告)号：US5883890A

公开(公告)日：1999-03-16

申请号：US856815

申请日：1997-05-15

申请人： Kazuhiro Okanoue ,  Tomoki Ohsawa

发明人： Kazuhiro Okanoue ,  Tomoki Ohsawa

IPC分类号： H04L12/56 ,  H04L29/06 ,  H04L12/46

CPC分类号： H04W8/04 ,  H04L1/0079 ,  H04L12/4633 ,  H04W28/06 ,  H04L2212/00 ,  H04L69/22 ,  H04W24/00 ,  H04W8/12 ,  H04W8/26 ,  H04W80/04

摘要： A message routing system for use in a mobile packet communication system where communication between mobile terminals is conducted by evaluating headers of data messages. The source and destination of each data message is determined by evaluating the inherent address and position address of each data message without each header containing any association data relating the inherent address and the position address. By facilitating such a message routing process, the amount of communications between mobile terminals is reduced.

摘要翻译： 一种在移动分组通信系统中使用的消息路由系统，其中通过评估数据消息的报头来进行移动终端之间的通信。 通过评估每个数据消息的固有地址和位置地址来确定每个数据消息的源和目的地，而每个报头都不包含与固有地址和位置地址有关的任何关联数据。 通过促进这样的消息路由处理，移动终端之间的通信量减少。

公开(公告)号：US5841769A

公开(公告)日：1998-11-24

申请号：US572749

申请日：1995-12-14

申请人： Kazuhiro Okanoue ,  Tomoki Ohsawa

发明人： Kazuhiro Okanoue ,  Tomoki Ohsawa

IPC分类号： H04L12/56 ,  H04L29/06 ,  H04L12/46

CPC分类号： H04W8/04 ,  H04L1/0079 ,  H04L12/4633 ,  H04W28/06 ,  H04L2212/00 ,  H04L69/22 ,  H04W24/00 ,  H04W8/12 ,  H04W8/26 ,  H04W80/04

摘要： A mobile packet communication system has a plurality of mobile terminals movable between a plurality of auxiliary networks. Each of the mobile terminals has an inherent address processing layer for adding a packet header based on the inherent address thereof to transmission data from a higher layer, and a positional address processing layer for adding a packet header based on the positional address thereof to the transmission data to which the packet header based on the inherent address has been added by the inherent address processing layer. The packet headers contain no header information representing an association between the inherent address and the positional address. The mobile packet communication system facilitates a control process for maintaining data relative to an association between addresses and reduces an amount of communications required by such a control process.

摘要翻译： 移动分组通信系统具有可在多个辅助网络之间移动的多个移动终端。 每个移动终端具有固有地址处理层，用于根据其固有地址将分组报头添加到来自较高层的传输数据，以及位置地址处理层，用于基于其位置地址将分组标题添加到传输 基于固有地址的分组报头已由固有地址处理层添加到的数据。 分组报头不包含表示固有地址和位置地址之间的关联的报头信息。 移动分组通信系统有助于相对于地址之间的关联来维护数据的控制过程，并减少这种控制过程所需的通信量。

公开(公告)号：US5519699A

公开(公告)日：1996-05-21

申请号：US290180

申请日：1994-08-15

申请人： Tomoki Ohsawa

发明人： Tomoki Ohsawa

IPC分类号： H04L29/08 ,  H04L29/06 ,  H04L1/16 ,  H04L12/54

CPC分类号： H04L29/06

摘要： In packet communication, when applying end-to-end control protocol such as the fourth layer protocol of Open Systems Interconnection (OSI), a large delay existing in only a portion within the network gives rise to an extreme drop in throughput. The present invention is intended to avoid this problem without altering the fourth layer protocol. This network is structured such that a sending terminal and a receiving terminal are connected by a plurality of routers, and a portion of the routers have large propagation delay. Each router is constructed from a virtual terminal controller that, from the time connection is established until disconnection of the communication circuit, operates identically to the opposing terminal upon receiving a signal from the terminal to which it is connected; a memory circuit that stores data upon reception of the data; and a data link controller that raises throughput of a circuit having large delay. Accordingly, because transmission of succeeding data can be carried out by receiving an ACK signal from the router connected to the sending terminal without waiting for the ACK signal response from the receiving terminal, gaps in transmission are reduced and the influence of intermediate circuits having large propagation delay can be avoided.

摘要翻译： 在分组通信中，当应用诸如开放系统互连（OSI）的第四层协议的端到端控制协议时，仅存在于网络中的一部分内的大的延迟导致吞吐量的极大下降。 本发明旨在避免这个问题而不改变第四层协议。 该网络被构造成使得发送终端和接收终端由多个路由器连接，并且一部分路由器具有大的传播延迟。 每个路由器由虚拟终端控制器构成，从连接建立到通信电路断开时，从与其连接的终端接收到信号时，与相对终端相同地工作; 存储电路，用于在数据接收时存储数据; 以及提高具有大延迟的电路的吞吐量的数据链路控制器。 因此，由于可以通过从连接到发送终端的路由器接收到ACK信号而不等待来自接收终端的ACK信号响应来执行后续数据的发送，所以传输中的间隙减小，并且具有较大传播的中间电路的影响 可以避免延迟。

公开(公告)号：US5303264A

公开(公告)日：1994-04-12

申请号：US693183

申请日：1991-04-29

申请人： Tomoki Ohsawa

发明人： Tomoki Ohsawa

IPC分类号： H03H21/00 ,  H03H15/00 ,  H03H17/00 ,  H04B3/14 ,  H04B7/005 ,  H04L25/03 ,  H03H7/30

CPC分类号： H04L25/03057 ,  H04B7/005

摘要： Disclosed is a hardware arrangement for equalizing waveform distortion caused by multipath fading in a digital radio communications system, which hardware arrangement uses a recursive least-squares algorithm into which a forgetting factor is introduced. An incoming signal (PSK signal for example) is applied to an automatic gain controller which generates a first signal whose value varies with a signal-to-noise ratio of the incoming signal. A forgetting factor controller is coupled to the automatic gain controller to receive the first signal and generates the forgetting factor the value of which varies with the value of the first signal. An adaptive equalizer receives the incoming signal and the forgetting factor. The adaptive equalizer equalizes the waveform distortion using the forgetting factor according to the recursive least-squares algorithm.

摘要翻译： 公开了一种用于均衡由数字无线电通信系统中的多径衰落引起的波形失真的硬件装置，该硬件装置使用其中引入遗忘因子的递归最小二乘法算法。 输入信号（例如PSK信号）被施加到自动增益控制器，该自动增益控制器产生其值随输入信号的信噪比而变化的第一信号。 遗忘因子控制器耦合到自动增益控制器以接收第一信号并产生其值随着第一信号的值而变化的遗忘因子。 自适应均衡器接收输入信号和遗忘因子。 自适应均衡器根据递归最小二乘法使用遗忘因子来平衡波形失真。

公开(公告)号：US5090027A

公开(公告)日：1992-02-18

申请号：US470215

申请日：1990-01-25

申请人： Tomoki Ohsawa

发明人： Tomoki Ohsawa

IPC分类号： H04L27/01 ,  H04L27/227

CPC分类号： H04L27/2276 ,  H04L27/01

摘要： A coherent PSK demodulator includes a frequency multiplier for multiplying the frequency of an incoming M-ary PSK signal by a factor M to extract a carrier component of the PSK signal. An adaptive line enhancer is connected to the frequency multiplier for emphasizing the line spectrum of the extracted carrier component. A frequency divider is connected to the output of the enhancer to divide its frequency by a factor M and applies its output to a product demodulator as a local carrier for demodulating the incoming M-ary PSK signal. In a preferred embodiment, a synchronizer is connected between the output of the adaptive line enhancer and the frequency divider. Alternatively, a closed-loop phase error canceller is connected to the output of the product demodulator.

摘要翻译： 相干PSK解调器包括用于将输入的M元PSK信号的频率乘以因子M的倍频器，以提取PSK信号的载波分量。 自适应线增强器连接到倍频器，用于强调提取的载波分量的线谱。 分频器连接到增强器的输出端，将其频率除以系数M，并将其输出作为本地载波应用于产品解调器，以解调输入的M-ary PSK信号。 在优选实施例中，同步器连接在自适应线路增强器的输出端和分频器之间。 或者，闭环相位误差消除器连接到产品解调器的输出。

公开(公告)号：US5898927A

公开(公告)日：1999-04-27

申请号：US577814

申请日：1995-12-22

申请人： Kenichi Ishii ,  Tomoki Ohsawa

发明人： Kenichi Ishii ,  Tomoki Ohsawa

IPC分类号： H04B7/26 ,  H04W16/14 ,  H04W24/00 ,  H04W72/08

CPC分类号： H04W72/085 ,  H04B7/26

摘要： In each cell of a plurality of cells of a mobile communication network assigned with a predetermined number of radio channels, a base station allocates to a call one of the radio channels according to autonomous channel reuse partitioning as a communication channel on transmitting messages to and from a mobile unit which is currently present alive in the cell under consideration. For use as the communication channel, the radio channel should preferably have a base and a mobile carrier to interference ratio which is equal to or greater than a first allocation threshold level determined by a sum of a power control margin for base and mobile transmission powers and a second allocation threshold level determined to be sufficient for transmission of the messages. If such a radio channel is not available, another of the radio channels is used as the communication channel that has the base and the mobile carrier to interference ratios both equal to or greater than the second allocation threshold level. It is thereby rendered possible to control the mobile transmission power after allocation of the communication channel and furthermore the base transmission power.

摘要翻译： 在分配有预定数量的无线电信道的移动通信网络的多个小区的每个小区中，基站根据自主信道重用分配来分配一个无线电信道，作为向和/ 当前存在于正在考虑的单元中的移动单元。 为了用作通信信道，无线电信道应该优选地具有等于或大于由基站和移动发射功率的功率控制余量之和确定的第一分配阈值水平的基站和移动载波干扰比，以及 被确定为足以传送消息的第二分配阈值级别。 如果这样的无线电信道不可用，则另一个无线电信道被用作具有等于或大于第二分配阈值电平的基站和移动载波干扰比的通信信道。 由此，能够控制分配通信信道之后的移动发送功率，进一步控制基站发送功率。

公开(公告)号：US5771454A

公开(公告)日：1998-06-23

申请号：US611563

申请日：1996-03-06

申请人： Tomoki Ohsawa

发明人： Tomoki Ohsawa

IPC分类号： H04W16/04 ,  H04W16/32 ,  H04Q7/36

CPC分类号： H04W16/04 ,  H04W16/32

摘要： A channel assignment method wherein, when cover areas of base stations in a mobile radio communication system of the cellular system hierarchically overlap each other, communication channels are used commonly by the hierarchies to achieve effective utilization of frequencies by dynamic channel assignment. When a request for communication occurs, communication channels to which different selection orders between different hierarchies are applied are checked in terms of the channel quality based on the selection order, and a channel which exceeds a certain quality at first is assigned to the request for communication, but when a channel with which a required quality is obtained cannot be found in one of the hierarchies, selection of a channel is performed for another hierarchy by similar operations. When a request for communication arises, each base station performs selection from within the same hierarchy, and in this instance, a channel with which selection is to be begun is offset between the different hierarchies. Each base station controls the offset value based on a blocking occurrence value and/or a hand-over failure occurrence number of the base station so that it may be decreased in a hierarchy whose value or values mentioned are comparatively high.

摘要翻译： 一种信道分配方法，其中，当蜂窝系统的移动无线电通信系统中的基站的覆盖区域彼此分层地重叠时，所述层次结构通常使用通信信道，以通过动态信道分配来实现频率的有效利用。 当发生通信请求时，基于选择顺序来检查应用了不同层次之间的不同选择顺序的通信信道，并且首先将超过一定质量的信道分配给通信请求 但是当在其中一个层次中不能找到获得所需质量的信道时，通过类似的操作对另一层次进行信道的选择。 当出现通信请求时，每个基站从同一层次中执行选择，并且在这种情况下，选择开始的信道在不同层次之间偏移。 每个基站基于基站的阻塞发生值和/或切换失败发生次数来控制偏移值，使得其可以在其值或值相对较高的层次中减小。