公开(公告)号：US5774494A

公开(公告)日：1998-06-30

申请号：US342349

申请日：1994-11-18

申请人： Mamoru Sawahashi ,  Tomohiro Dohi

发明人： Mamoru Sawahashi ,  Tomohiro Dohi

IPC分类号： H04B1/707 ,  H04B1/7087 ,  H04J13/00 ,  H04B15/00

CPC分类号： H04B1/707

摘要： A frequency correction device for a spread-spectrum communication receiver requiring no high-accuracy, high-stable VCO as a local signal oscillator. It includes a quasi-coherent quadrature detector detecting an intermediate frequency signal using a local signal from a fixed frequency local oscillator, a correlation detector producing a despread signal by demodulating the output of the detector, a clock signal generating portion generating a pair of clock signals whose frequency is deviated a little with respect to a clock signal for driving the correlation detector. The pair of clock signals are used to drive two correlation detectors, and the amplitude of the outputs of the correlation detectors are squared, and then subtracted, thereby generating a correlation output error signal. Since the correlation output error signal has one to one correspondence with the frequency difference between the chip frequency of the spread spectrum signal outputted from the quasi-coherent quadrature detector and the frequency of the clock signal, a frequency correction signal can be generated by converting the correlation output error signal into the frequency error. The frequency difference between despread signal and the clock signal, which arises from the difference between the center frequency of a received signal and the local signal, can be corrected by correcting the frequency of the despread signal by the frequency correction signal.

摘要翻译： 用于扩频通信接收机的频率校正装置，不需要高精度，高稳定的VCO作为本地信号振荡器。 它包括使用来自固定频率本地振荡器的本地信号检测中频信号的准相干正交检测器，相关检测器，通过解调检测器的输出产生解扩信号;时钟信号产生部分，产生一对时钟信号 其频率相对于用于驱动相关检测器的时钟信号偏离一点。 该对时钟信号用于驱动两个相关检测器，相关检测器的输出的幅度平方，然后减去，从而产生相关输出误差信号。 由于相关输出误差信号与从准相干正交检波器输出的扩频信号的码片频率与时钟信号的频率之间的频率差一一对应，所以可以通过转换频率校正信号 相关输出误差信号进入频率误差。 由接收信号的中心频率与本地信号之间的差异产生的解扩信号与时钟信号之间的频差可以通过频率校正信号校正解扩信号的频率来进行校正。

公开(公告)号：US5768306A

公开(公告)日：1998-06-16

申请号：US906133

申请日：1997-07-25

申请人： Mamoru Sawahashi ,  Fumiyuki Adachi

发明人： Mamoru Sawahashi ,  Fumiyuki Adachi

IPC分类号： H04B1/7075 ,  H04B1/7095 ,  H04B1/707

CPC分类号： H04B1/7075 ,  H04B1/7095

摘要： A sliding correlator is disclosed for establishing initial synchronization to spectrum-despread a received signal into a narrow band signal in a radio receiver in a spread spectrum CDMA system. The a sliding correlator can achieve high speed synchronization. A received signal is stored in a memory circuit (43). The received signal is read from the memory circuit (43) at a frequency substantially higher than the storing rate of the received signal. The read received signal is multiplied by a replica of a spreading code sequence by means of a multiplier (45), and the output signal of the multiplier (45) is accumulated by an accumulator (46) over a predetermined time period. The output of the accumulator (46) is decided by a threshold detector (47) whether or not it exceeds a predetermined threshold. When the output of the threshold detector (47) is less than the threshold, the phase of the spreading code sequence is shifted, and the detection is repeated. Since the correlation is taken by reading the received signal from the memory circuit (43) at a high speed, the initial synchronization can be established quickly.

摘要翻译： 公开了一种用于建立初始同步的滑动相关器，以在扩频CDMA系统中的无线电接收机中将接收信号频谱扩展成窄带信号。 滑动相关器可实现高速同步。 接收到的信号被存储在存储器电路（43）中。 接收到的信号以比接收信号的存储速率大得多的频率从存储器电路（43）读出。 读取的接收信号通过乘法器（45）与扩展码序列的副本相乘，乘法器（45）的输出信号由累加器（46）在预定时间段内累积。 累加器（46）的输出由阈值检测器（47）确定，无论其是否超过预定阈值。 当阈值检测器（47）的输出小于阈值时，扩展码序列的相位被移位，并且重复检测。 由于通过从存储器电路（43）高速读出接收信号来进行相关，所以可以快速建立初始同步。

公开(公告)号：US5757844A

公开(公告)日：1998-05-26

申请号：US411682

申请日：1995-07-18

申请人： Kazuhiko Fukawa ,  Hiroshi Suzuki

发明人： Kazuhiko Fukawa ,  Hiroshi Suzuki

IPC分类号： H04B1/707 ,  H04K1/00

CPC分类号： H04B1/7097 ,  H04B1/7105

摘要： Good bit error performance is necessary in a spread spectrum receiver even when there is severe fast varying fading fluctuation. To achieve this, the received signal is despread and outputted as a plurality of despread signals. Signal decision is performed on the basis of the result of linear combination of the despread signals. Alternatively, a priori estimation errors are calculated by subtracting, for each despread signal, an estimated despread signal from the despread signal, and signal decision is performed on the basis of the sum of the squares of these a priori estimation errors for each despread signal. Tap coefficients are estimated by employing an RLS algorithm in which the a priori tap coefficient vector is replaced with the result of multiplying the a priori tap coefficient vector by a transition matrix.

摘要翻译： PCT No.PCT / JP94 / 01702 Sec。 371 1995年7月18日第 102（e）日期1995年7月18日PCT 1994年10月12日PCT PCT。 公开号WO95 / 10892 日期1995年04月20日即使存在严重的快速变化衰落波动，扩频接收机也需要良好的比特误差性能。 为了实现这一点，接收信号被解扩展并作为多个解扩信号输出。 基于去扩展信号的线性组合的结果进行信号判定。 或者，通过从解扩展信号中减去每个去扩展信号估计的去扩展信号来计算先验估计误差，并且基于每个去扩展信号的这些先验估计误差的平方和执行信号判定。 通过采用RLS算法来估计抽头系数，其中先验抽头系数向量被替换为先验抽头系数向量乘以转移矩阵的结果。

公开(公告)号：US5740096A

公开(公告)日：1998-04-14

申请号：US708986

申请日：1996-09-06

申请人： Guoliang Shou ,  Changming Zhou ,  Makoto Yamamoto ,  Mamoru Sawahashi ,  Fumiyuki Adachi ,  Sunao Takatori

发明人： Guoliang Shou ,  Changming Zhou ,  Makoto Yamamoto ,  Mamoru Sawahashi ,  Fumiyuki Adachi ,  Sunao Takatori

IPC分类号： H03M1/12 ,  H03H11/04 ,  H03H17/00 ,  H03H17/02 ,  H04B1/69 ,  H04J13/00 ,  G06G7/02

CPC分类号： H03H17/0254 ,  H03H11/04 ,  H04B1/7093

摘要： The present invention has an object to provide a filter circuit for communication generative an effective digital output as well as an analog output in a filter circuit of low electric power consumption. The function speed of an A/D converting circuit is minimized by intermittently holding an analog output signal according to an experience that peak detection can be performed by partially sampling the signal after the acquisition.

公开(公告)号：US5737082A

公开(公告)日：1998-04-07

申请号：US506385

申请日：1995-07-24

申请人： Taro Itatani ,  Tadashi Nakagawa ,  Yoshinobu Sugiyama ,  Kimihiro Ohta

发明人： Taro Itatani ,  Tadashi Nakagawa ,  Yoshinobu Sugiyama ,  Kimihiro Ohta

IPC分类号： G01R15/24 ,  G01J4/00 ,  G01R19/00 ,  G01R29/12 ,  G01R29/14 ,  G01R31/302

CPC分类号： G01R15/242 ,  G01J4/00

摘要： An apparatus of measuring an electric signal comprises a laser device, optical elements, an electrooptic crystal, a photoelectric converter, and an electric circuit. The electrooptic crystal is selected from the materials in the type of having properties of changing its refractive index in the direction of its optic major axes and the direction of these axes by a function of an applied electric field. In the apparatus, the electrooptic crystal is placed in the electric field applied by an electric circuit under measurement. A laser beam emitted from the laser device is incident on the electrooptic crystal. A reflected light passed through the crystal is resolved into rays in two polarized direction. Each ray is subjected to a photoelectric conversion by passing through the photoelectric converter and exerted as an electric output. A differential signal of the electric output is defined as a measurement signal. By selecting two polarized directions of the laser beam by a half-wave plate as the optical element, two signals corresponding to the changes in the refractive index and optic major axes of the crystal. Two component of a vector of the electric field can be obtained by a first order combination of these signals.

摘要翻译： 测量电信号的装置包括激光装置，光学元件，电光晶体，光电转换器和电路。 电光晶体选自具有通过施加的电场的函数在其光学主轴的方向上改变其折射率的特性的类型的材料和这些轴的方向。 在该装置中，将电光晶体放置在由测量电路施加的电场中。 从激光装置发射的激光束入射到电光晶体上。 通过晶体的反射光在两个偏振方向被分解为光线。 每个射线通过光电转换器进行光电转换并作为电输出施加。 电输出的差分信号被定义为测量信号。 通过用半波片选择激光束的两个偏振方向作为光学元件，对应于晶体的折射率和光学主轴的变化的两个信号。 可以通过这些信号的一阶组合来获得电场矢量的两个分量。

公开(公告)号：US5734648A

公开(公告)日：1998-03-31

申请号：US541620

申请日：1995-10-10

申请人： Fumiyuki Adachi ,  Mamoru Sawahashi

发明人： Fumiyuki Adachi ,  Mamoru Sawahashi

IPC分类号： H04W76/02 ,  H04B7/26 ,  H04J13/00 ,  H04W76/00

CPC分类号： H04B7/264

摘要： A CDMA communications method capable of multiplex transmission of data over a wide range from a low rate to high rate, such as image data, without a considerable increase in a circuit scale. A fundamental transmission rate is determined, for example, at 32 kbps, a rate higher than 8 kbps conventionally used. The data whose transmission rate is equal to the fundamental transmission rate is transmitted in frames including no vacant portion. Data whose transmission rate is lower than the fundamental transmission rate (16 kbps, for example) are transmitted in frames including vacant portions. The vacant portions are not transmitted. This makes it possible to receive data through other channels during a time period associated with the vacant portions. Data of a higher transmission rate, 128 kbps, for example, can be multiplexed and transmitted through four channels using different spreading codes.

摘要翻译： 一种CDMA通信方法，能够在诸如图像数据的低速率到高速率的范围内多路传输数据，而不会显着增加电路规模。 确定基本传输速率，例如以32kbps，高于常规使用的8kbps的速率。 传输速率等于基本传输速率的数据以包括空格部分在内的帧发送。 传输速率低于基本传输速率（例如16kbps）的数据在包括空白部分的帧中传输。 空的部分不被传送。 这使得可以在与空闲部分相关联的时间段期间通过其他信道接收数据。 例如，128kbps的较高传输速率的数据可以通过使用不同扩展码的四个信道进行复用和传输。

公开(公告)号：US5715235A

公开(公告)日：1998-02-03

申请号：US342582

申请日：1994-11-21

申请人： Mamoru Sawahashi ,  Tomohiro Dohi ,  Fumiyuki Adachi

发明人： Mamoru Sawahashi ,  Tomohiro Dohi ,  Fumiyuki Adachi

IPC分类号： H04B1/28 ,  H04B1/707 ,  H04B17/00 ,  H04J11/00 ,  H04B7/208

CPC分类号： H04B1/0007 ,  H04B1/0003 ,  H04B1/7093 ,  H04B17/318 ,  H04B1/28

摘要： A communication apparatus is disclosed which is capable of measuring levels of carrier signals used in adjacent zones during telecommunication with a small circuit scale, and capable of simultaneously transmitting/receiving to FDMA-system signals through a plurality of communication channels. All of transmission signals received through the communication channels under use are wholly converted into an intermediate signal by a mixer. The intermediate signal is quadrature-detected and then A/D-converted into digital I/Q-channel signals by A/D-converters. Thereafter, the digital I/Q-channel signals are frequency-converted by frequency converting circuits in such a manner that center frequencies of these I/Q-channel signals become zero, two sets of I/Q-channel signals may be demodulated by two sets of demodulating circuits. Otherwise, one of these I/Q-channel signals is demodulated by a single demodulating circuit, and the other is level-detected by a level detecting circuit.

摘要翻译： 公开了一种通信装置，其能够以小电路规模测量在通信期间在相邻区域中使用的载波信号的电平，并且能够通过多个通信信道同时发送/接收FDMA系统信号。 通过正在使用的通信信道接收到的所有传输信号通过混频器完全转换成中间信号。 中间信号被正交检测，然后通过A / D转换器A / D转换成数字I / Q通道信号。 此后，数字I / Q信道信号通过频率转换电路以这些I / Q信道信号的中心频率变为零的方式进行频率转换，两组I / Q信道信号可以由两个 解调电路组。 否则，这些I / Q信道信号之一由单个解调电路解调，另一个由电平检测电路进行电平检测。

公开(公告)号：US5649301A

公开(公告)日：1997-07-15

申请号：US244944

申请日：1994-06-17

申请人： Masami Yabusaki ,  Yasuo Maruyama ,  Shoichi Hirata ,  Hiroshi Nakamura ,  Yasuyuki Uchiyama ,  Hiroshi Tsukahara ,  Eriko Takemoto

发明人： Masami Yabusaki ,  Yasuo Maruyama ,  Shoichi Hirata ,  Hiroshi Nakamura ,  Yasuyuki Uchiyama ,  Hiroshi Tsukahara ,  Eriko Takemoto

IPC分类号： H04W8/06 ,  H04W8/12 ,  H04W76/02 ,  H04B7/24

CPC分类号： H04W8/12 ,  H04W8/06 ,  H04W76/02

摘要： In a mobile communication network, a mobile unit location register ML and a subscriber location register SL are provided. In the mobile unit location register the mobile location of a mobile unit MT is registered, whereas in the subscriber location register a mobile unit MT selected by each subscriber SB as a terminal for call terminating use is registered. Upon receiving a terminating call for a subscriber, a switching center SW reads out, from the subscriber location register SL, an identifying number TID of the mobile unit registered by the subscriber SB as a terminal for call terminating use and uses the mobile unit identifying number TID to read out the mobile location of the mobile unit MT from the mobile unit location register ML, thereafter sending the terminating call to the registered mobile unit of the read-out mobile location.

摘要翻译： PCT No.PCT / JP93 / 01496 Sec。 371日期：1994年6月17日 102（e）日期1994年6月17日PCT提交1993年10月18日PCT公布。 出版物WO94 / 09600 日期1994年04月28日在移动通信网络中，提供移动单元位置寄存器ML和用户位置寄存器SL。 在移动单元位置寄存器中登记移动单元MT的移动位置，而在用户位置寄存器中登记由每个用户SB选择的移动单元MT作为用于呼叫终止使用的终端。 在接收到用户的终止呼叫时，交换中心SW从用户位置寄存器SL读出由用户SB注册的移动单元的标识号TID作为呼叫终止使用的终端，并使用移动单元标识号 TID从移动单元位置寄存器ML读出移动单元MT的移动位置，然后将终止呼叫发送到读出移动位置的注册移动单元。

公开(公告)号：US5602484A

公开(公告)日：1997-02-11

申请号：US373219

申请日：1995-01-18

申请人： Hiroshi Suzuki ,  Kazuhiko Fukawa

发明人： Hiroshi Suzuki ,  Kazuhiko Fukawa

IPC分类号： H04B1/10 ,  H04B7/005 ,  H03D3/00

CPC分类号： H04W52/343 ,  H04B1/1027 ,  H04W52/346

摘要： A multipath component detector detects the correlation between a received signal and a reference signal in a training period of the received signal and estimates and outputs the multipath received component levels at a plurality of timing points. A component ratio calculator calculates the ratio of each received component to the overall received power. By this, the level ratio of a specified received component can be detected. Power dissipation can be minimized by switching the detector to a differential detector or an adaptive equalizer in accordance with the result of the delay spread measurement.

摘要翻译： PCT No.PCT / JP94 / 01691 Sec。 371 1995年1月18日第 102（e）日期1995年1月18日PCT 1994年10月11日PCT PCT。 WO95 / 10888 PCT出版物 日期1995年04月20日多径分量检测器在接收信号的训练周期中检测接收信号与参考信号之间的相关性，并在多个定时点估计并输出多径接收分量电平。 分量比率计算器计算每个接收分量与总接收功率的比率。 由此，可以检测指定的接收分量的电平比。 根据延迟扩展测量的结果，可以将检测器切换到差分检测器或自适应均衡器来减小功耗。

公开(公告)号：US5581547A

公开(公告)日：1996-12-03

申请号：US325318

申请日：1994-10-25

申请人： Narumi Umeda ,  Youichi Douzono ,  Tadashi Matsumoto

发明人： Narumi Umeda ,  Youichi Douzono ,  Tadashi Matsumoto

IPC分类号： H04B1/707 ,  H04B7/26 ,  H04J13/00 ,  H04L12/56

CPC分类号： H04W74/08 ,  H04B1/707 ,  H04B7/2628 ,  H04B2201/709709

摘要： Mobile stations randomly set delay amounts for each message to be sent, on the basis of the timing of a symbol received from a base station, and delay transmission signals for time intervals corresponding to the delay amounts. The base station 11 despreads signals received from the mobile stations to extract basic symbol timing for each mobile station and, at the thus extracted timing, takes each despread output into the corresponding demodulator for demodulation.

摘要翻译： PCT No.PCT / JP94 / 00338 Sec。 371日期：1994年10月25日 102（e）日期1994年10月25日PCT 1994年3月3日PCT公布。 公开号WO94 / 21056 1994年9月15日，移动台根据从基站接收到的符号的定时，随机地设定要发送的每条消息的延迟量，并延迟与延迟量对应的时间间隔的发送信号。 基站11对从移动台接收到的信号进行解扩，提取各移动台的基本符号定时，在这样提取的定时，将每个去扩展的输出变换为相应的解调器进行解调。