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    Coherent detector and a coherent detection method for a digital communication receiver
    1.
    发明授权
    Coherent detector and a coherent detection method for a digital communication receiver 失效
    相干检测器和数字通信接收机的相干检测方法

    公开(公告)号：US5692015A

    公开(公告)日：1997-11-25

    申请号：US553464

    申请日：1995-11-28

    申请人： Akihiro Higashi ,  Fumiyuki Adachi ,  Koji Ohno ,  Mamoru Sawahashi

    发明人： Akihiro Higashi ,  Fumiyuki Adachi ,  Koji Ohno ,  Mamoru Sawahashi

    IPC分类号： H04L7/08 ,  H04L25/02 ,  H03D1/00 ,  H04L27/06

    CPC分类号： H04L25/0236 ,  H04L25/0212 ,  H04L25/0232 ,  H04L7/08

    摘要： A coherent detection method including a step of estimating a transfer function of a propagation path using pseudo-pilot signals which consist of some information symbols adjacent to pilot signals. The information symbols in the pseudo-pilot signals are assumed to be known. The method includes the steps of estimating the transfer functions using the pilot signals, carrying out interpolation coherent detection of the information symbols using the estimated transfer functions, storing the detection results as the pseudo-pilot signals, reestimating the transfer functions associated with the information symbols corresponding to the pseudo-pilot signals by using the pseudo-pilot signals and the corresponding received signal under the assumption that the pseudo-pilot signals have a known correct pattern, and carrying out the interpolation coherent detection of the individual information symbols by using the transfer functions obtained by the reestimation. This makes it possible to estimate the transfer function at high accuracy with a small number of symbols per pilot signal, thereby improving the detection characteristics.

    摘要翻译： PCT No.PCT / JP95 / 01229 Sec。 371日期：1995年11月28日 102（e）1995年11月28日日期PCT 1995年6月21日PCT PCT。 公开号WO95 / 35615 日期1995年12月28日一种相干检测方法，包括使用由与导频信号相邻的一些信息符号组成的伪导频信号来估计传播路径的传递函数的步骤。 伪导频信号中的信息符号被认为是已知的。 该方法包括以下步骤：使用导频信号估计传递函数，使用估计的传递函数执行信息符号的内插相关检测，将检测结果存储为伪导频信号，重新估计与信息符号相关联的传递函数 在伪导频信号具有已知正确模式的假设下，通过使用伪导频信号和相应的接收信号对应于伪导频信号，并且通过使用传输来执行个体信息符号的内插相关检测 通过重新获得的功能。 这使得可以以每个导频信号的少量符号高精度地估计传递函数，从而提高检测特性。

    Receiver and repeater for spread spectrum communications
    2.
    发明授权
    Receiver and repeater for spread spectrum communications 失效
    接收机和中继器用于扩频通信

    公开(公告)号：US5652765A

    公开(公告)日：1997-07-29

    申请号：US411645

    申请日：1995-05-22

    申请人： Fumiyuki Adachi ,  Mamoru Sawahashi ,  Akihiro Higashi ,  Koji Ohno ,  Tomohiro Dohi

    发明人： Fumiyuki Adachi ,  Mamoru Sawahashi ,  Akihiro Higashi ,  Koji Ohno ,  Tomohiro Dohi

    IPC分类号： H04B1/707 ,  H04B7/06 ,  H04B7/08 ,  H04B3/36 ,  H04B7/17 ,  H04B17/02 ,  H04L25/20

    CPC分类号： H04B7/0894 ,  H04B1/712 ,  H04B7/0671

    摘要： A repeater improving the effect of a RAKE reception. A received signal from a base station parallelly passes a first path including a first delay circuit and a second path including no delay circuit, and is transmitted to a mobile station. A received signal from the mobile station parallelly passes a third path including a second delay circuit and a fourth path including no delay circuit, and is transmitted to the base station. The delay time of the delay circuits are set at one chip interval or more of a spreading code. This forcedly produces multipath waves which are resolvable by a RAKE receiver. The RAKE receiver estimates amplitudes of desired wave components for individual delayed waves, performs weighting of the respective delayed wave components from detectors by using the estimated amplitudes, and makes symbol decision in terms of the combined weighted signal.

    摘要翻译： PCT No.PCT / JP94 / 01283第 371日期：1995年5月22日 102（e）日期1995年5月22日PCT 1994年8月4日PCT PCT。 第WO95 / 05037号公报 日期1995年2月16日中继器改善RAKE接收的效果。 来自基站的接收信号并行地通过包括第一延迟电路和不包括延迟电路的第二路径的第一路径，并被发送到移动站。 来自移动站的接收信号并行地通过包括第二延迟电路的第三路径和不包括延迟电路的第四路径，并且被发送到基站。 延迟电路的延迟时间设定为扩展码的一个码片间隔或更多个码片间隔。 这强制产生可由RAKE接收机解析的多径波。 RAKE接收机估计各个延迟波的期望波分量的振幅，通过使用估计的幅度对来自检测器的各个延迟波分量进行加权，并根据组合的加权信号进行符号判定。

    Signal transmitting method, transmitter, receiver, and spread-spectrum code synchronizing method for mobile communication system
    3.
    发明授权
    Signal transmitting method, transmitter, receiver, and spread-spectrum code synchronizing method for mobile communication system 失效
    用于移动通信系统的信号发射方法，发射机，接收机和扩频码同步方法

    公开(公告)号：US6167037A

    公开(公告)日：2000-12-26

    申请号：US952081

    申请日：1997-11-03

    申请人： Kenichi Higuchi ,  Mamoru Sawahashi ,  Fumiyuki Adachi ,  Koji Ohno ,  Akihiro Higashi

    发明人： Kenichi Higuchi ,  Mamoru Sawahashi ,  Fumiyuki Adachi ,  Koji Ohno ,  Akihiro Higashi

    IPC分类号： H04B1/707 ,  H04B1/7075 ,  H04B7/26 ,  H04W48/16 ,  H04W56/00 ,  H04B7/216

    CPC分类号： H04B1/70756 ,  H04B1/70755 ,  H04B1/708 ,  H04B1/7083 ,  H04B2201/70702 ,  H04J13/16 ,  H04J2013/0037

    摘要： Achieving high speed spreading code synchronization of a forward link control channel. A control channel information signal and traffic channel information signals are each spread by different first spreading codes which are fed from a first spreading code (short code) generator (11), and which have a period equal to the period of an information symbol. Subsequently, only the control channel information signal is spread by a third spreading code which is fed from a third spreading code (long code masked portion complex conjugate code) generator (12), and which has a form of complex conjugate of a long code (second spreading code) used for spreading in common. The signals of the entire channels are summed up by an adder (13) at appropriate timings, and the resultant sum is spread by the second spreading code fed from a second spreading code generator (14), thereby being output as a spread modulation signal.

    摘要翻译： PCT No.PCT / JP97 / 00657 Sec。 371日期：1997年11月3日 102（e）日期1997年11月3日PCT 1997年3月4日PCT公布。 公开号WO97 / 33400 PCT 日期1997年9月12日正向链路控制通道的高速扩频码同步。 控制信道信息信号和业务信道信息信号各自由从第一扩展码（短码）发生器（11）馈送的不同的第一扩展码进行扩展，并且其周期等于信息符号的周期。 随后，只有控制信道信息信号被从第三扩展码（长码屏蔽部分复共轭码）发生器（12）馈送的第三扩展码扩展，并且具有长码（ 第二扩展码）用于共同传播。 整个信道的信号在适当的定时由加法器（13）求和，并且所得到的和由第二扩展码发生器（14）馈送的第二扩展码扩展，从而作为扩展调制信号被输出。

    Channel estimation unit, and CDMA receiver and CDMA transceiver with channel estimation unit
    5.
    发明授权
    Channel estimation unit, and CDMA receiver and CDMA transceiver with channel estimation unit 失效
    信道估计单元，以及具有信道估计单元的CDMA接收机和CDMA收发器

    公开(公告)号：US06647003B1

    公开(公告)日：2003-11-11

    申请号：US09358037

    申请日：1999-07-20

    申请人： Sadayuki Abeta ,  Mamoru Sawahashi ,  Fumiyuki Adachi

    发明人： Sadayuki Abeta ,  Mamoru Sawahashi ,  Fumiyuki Adachi

    IPC分类号： H04B7216

    CPC分类号： H04L25/0212 ,  H04B2201/70701 ,  H04L25/0226 ,  H04L25/0234

    摘要： There are provided a channel estimation unit for achieving highly accurate channel estimation, a CDMA receiver and a CDMA transceiver with the channel estimation unit. Channel estimates of data symbols are obtained from a pilot symbol sequence which is parallel with a data symbol sequence. First, a plurality of pilot blocks are generated from the pilot symbol sequence. The channel estimates of the data symbols are obtained by calculating a sum of appropriately weighted averages of pilot symbols in the individual pilot blocks. This enables highly accurate channel estimation. More accurate channel estimation can be achieved by carrying out the channel estimation of the data symbols using the pilot symbols belonging to other slots rather than limiting to the pilot symbols in the slot to which the estimated data symbol belongs.

    摘要翻译： 提供了一种用于实现高度准确的信道估计的信道估计单元，具有信道估计单元的CDMA接收机和CDMA收发器。 从与数据符号序列并行的导频符号序列获得数据符号的信道估计。 首先，从导频符号序列生成多个导频块。 通过计算各个导频块中的导频符号的适当加权平均值的和来获得数据符号的信道估计。 这使得能够进行高度准确的信道估计。 可以通过使用属于其他时隙的导频符号执行数据符号的信道估计而不是限制估计数据符号所属的时隙中的导频符号来实现更准确的信道估计。

    Signal reception apparatus for DS-CDMA communication system
    8.
    发明授权
    Signal reception apparatus for DS-CDMA communication system 失效
    DS-CDMA通信系统的信号接收装置

    公开(公告)号：US06426949B1

    公开(公告)日：2002-07-30

    申请号：US09098357

    申请日：1998-06-17

    申请人： Changming Zhou ,  Xuping Zhou ,  Mamoru Sawahashi ,  Fumiyuki Adachi

    发明人： Changming Zhou ,  Xuping Zhou ,  Mamoru Sawahashi ,  Fumiyuki Adachi

    IPC分类号： H04B7216

    CPC分类号： H04B1/707 ,  H04B1/7115 ,  H04B2201/70701

    摘要： A signal reception apparatus for DS-CDMA communication system having a complex matched filter for despreading a received signal into I- and Q-components Di and Dq of despread signal. Dj and Dq are input to a path selection portion 13 for extracting a phase error in a pilot symbol block of the despread signal. A phase compensation signal is calculated according to the phase error in the portion 13. An information symbol is compensated according to the phase compensation signal. An electrical power is calculated from an average of the phase compensation signal of several slots for selecting paths to be received. The selected paths are combined with phase synchronized by a rake combiner 14.

    摘要翻译： 一种具有复数匹配滤波器的DS-CDMA通信系统的信号接收装置，用于将接收信号解扩展成解扩信号的I和Q分量Di和Dq。 Dj和Dq被输入到路径选择部分13，用于提取去扩展信号的导频符号块中的相位误差。 根据部分13中的相位误差来计算相位补偿信号。根据相位补偿信号补偿信息符号。 从用于选择要接收的路径的几个时隙的相位补偿信号的平均值计算电功率。 所选择的路径与由耙式组合器14相位同步的组合。

    Coherent tracking apparatus and method for CDMA receiver
    9.
    发明授权
    Coherent tracking apparatus and method for CDMA receiver 失效
    CDMA接收机的相干跟踪装置及方法

    公开(公告)号：US5898665A

    公开(公告)日：1999-04-27

    申请号：US702526

    申请日：1996-08-30

    申请人： Mamoru Sawahashi ,  Fumiyuki Adachi

    发明人： Mamoru Sawahashi ,  Fumiyuki Adachi

    IPC分类号： H04B1/707 ,  H04J13/04 ,  H04L7/00

    CPC分类号： H04B1/7085 ,  H04B1/709

    摘要： A coherent tracking apparatus for a CDMA receiver capable of achieving high accuracy tracking by suppressing noise. It includes a demodulation correlator for detecting correlation between a received spread signal and a demodulation spreading code replica inphase with a received spreading code included in the received spread signal by multiplying them, an absolute coherent detector for demodulating information data through absolute coherent detection of the correlation signal (despread signal) fed from the demodulation correlator, a tracking correlator for detecting correlation by multiplying the received spread signal by a pair of tracking spreading code replicas whose phases are shifted by .+-.1/2 chip period from the phase of the demodulation spreading code replica, a decided code corrector for performing reverse modulation of the difference (phase error signal) between the outputs of the tracking correlators with the output of the absolute coherent detector to remove modulated components of the information data included in the phase error signal, and a spreading code replica generator for generating the demodulation spreading code replica and the tracking spreading code replicas by carrying out phase control using the phase error signal output from the corrector.

    摘要翻译： PCT No.PCT / JP96 / 00006 Sec。 371日期：1996年8月30日 102（e）日期1996年8月30日PCT 1996年1月5日PCT PCT。 公开号WO96 / 21294 PCT 日期1996年7月11日用于能够通过抑制噪声实现高精度跟踪的CDMA接收机的相干跟踪装置。 它包括解调相关器，用于通过将接收的扩展信号中包含的接收的扩展码与它们相乘来检测接收的扩展信号和解调扩展码复制同相的相关性;绝对相干检测器，用于通过相关的绝对相干检测来解调信息数据 从解调相关器馈送的信号（去扩展信号），跟踪相关器，用于通过将接收的扩展信号乘以其相位偏移+ / - + E的一对跟踪扩展码副本来检测相关性，1/2 + EE码片周期 从解调扩展码副本的相位，确定代码校正器，用于执行跟踪相关器的输出之间的差异（相位误差信号）与绝对相干检测器的输出的反向调制，以去除包括的信息数据的调制分量 在相位误差信号中，以及扩展码复制发生器fo r通过使用从校正器输出的相位误差信号执行相位控制来产生解调扩展码副本和跟踪扩展码副本。

    Sliding correlator used in CDMA systems to establish initial synchronization
    10.
    发明授权
    Sliding correlator used in CDMA systems to establish initial synchronization 失效
    CDMA系统中使用的滑动相关器建立初始同步

    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。