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1.发明授权公开(公告)号：US06563859B1
公开(公告)日：2003-05-13
申请号：US09440341
申请日：1999-11-15
IPC分类号： H04B1707
CPC分类号： H04B1/7115 , H04B1/692 , H04L5/026 , H04L27/2647
摘要： A multi-carrier signal received by an antenna is converted into a signal of an IF band by an RX, and converted into an I signal and a Q signal by an quadrature detector. The I signal and the Q signal as multi-carrier signals are converted into digital signals by an A/D converter, and input to complex filters. The complex filters extract a complex signal having a specified carrier. Then, complex filters shift the center frequency of the extracted complex signal into 0 Hz. The obtained base band signal is input to a finger, and despread and demodulated. The despread and demodulated signal is RAKE synthesized by a synthesis unit, and transmitted to a signal discrimination unit.
摘要翻译： 由天线接收的多载波信号通过RX被转换为IF频带的信号，并由正交检波器转换为I信号和Q信号。 作为多载波信号的I信号和Q信号由A / D转换器转换成数字信号，并输入到复数滤波器。 复数滤波器提取具有指定载波的复信号。 然后，复数滤波器将提取的复信号的中心频率移动到0Hz。 所获得的基带信号被输入到手指，并被解扩和解调。 解扩信号由合成单元RAKE合成，发送到信号鉴别单元。
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公开(公告)号：US06442218B1
公开(公告)日：2002-08-27
申请号：US09377141
申请日：1999-08-19
申请人： Michiharu Nakamura , Yasuyuki Oishi , Kazuo Nagatani , Hajime Hamada , Yoshihiko Asano , Hiroyuki Seki , Yoshinori Tanaka
发明人： Michiharu Nakamura , Yasuyuki Oishi , Kazuo Nagatani , Hajime Hamada , Yoshihiko Asano , Hiroyuki Seki , Yoshinori Tanaka
IPC分类号： H03D100
CPC分类号： H04L25/062 , H04L25/03114
摘要： The present invention relates to a demodulator which receives a signal transmitted via phase modulation or multivalue QAM modulation, and decides transmitted data based on the received signal. The present invention enhances a transmission-line estimate by using tentatively decided data symbols as pilot symbols and in estimating a transmission line without a decrease in accuracy of transmission-line estimate even when an error rate of the tentatively decided data symbols is increased. The demodulator includes a pilot-based transmission-line estimation unit for estimating transmission-line characteristics by using pilot symbols. A tentative-data-decision unit for tentatively deciding data symbols based on the pilot-based transmission-line estimate. A data-based transmission-line estimation unit for estimating the transmission-line characteristics by using the tentatively decided data. Weight-coefficient-multiplication units for multiplying pilot-based and data-based transmission-line estimates by respective weights having a ratio therebetween varying in accordance with reliability of the tentatively ascertained data. A pilot&data-based transmission-line estimation unit for obtaining a transmission-line estimate by averaging weighted transmission-line estimates.
摘要翻译： 本发明涉及一种接收通过相位调制或多值QAM调制发送的信号的解调器，并且基于接收到的信号来确定发送的数据。 本发明通过使用暂时确定的数据符号作为导频符号，并且即使当临时确定的数据符号的错误率增加时，也不会降低传输线估计的精度，来增强传输线估计。 解调器包括基于导频的传输线估计单元，用于通过使用导频符号估计传输线特性。 一种暂定数据判定单元，用于基于基于导频的传输线估计暂时地确定数据符号。 一种基于数据的传输线估计单元，用于通过使用暂时确定的数据来估计传输线特性。 权重系数乘法单元，用于乘以基于导频和基于数据的传输线估计，其各自的权重之间的比率根据暂时确定的数据的可靠性而变化。 一种基于导频和数据的传输线估计单元，用于通过对加权的传输线估计进行平均来获得传输线估计。
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公开(公告)号：US06487193B1
公开(公告)日：2002-11-26
申请号：US09378265
申请日：1999-08-20
IPC分类号： H04B7216
CPC分类号： H04B7/18584
摘要： The present invention is directed to a path searching device and a CDMA receiver employing the same, having a reduced circuit scale and operating to carry out a smaller number of operations. For a direct spreading CDMA communication system, a CDMA receiver includes a reception demodulator including an antenna, a high-frequency amplifier a band-pass filter, demodulators, etc. The CDMA receiver also has despreading units, a determination unit, and a path search device. The path search device has a sampling unit for sampling an input signal by low-speed oversampling based on an integer multiple of a chip rate and by high-speed oversampling that is faster than the low-speed oversampling, a first circuit for finding a correlative value between a spreading code and a signal provided by the low-speed oversampling and finding timing corresponding to a maximum correlative value. A second circuit for finding despreading timing according to correlative values between a signal provided by the high-speed oversampling and a spreading code corresponding to the timing provided by the first circuit.
摘要翻译： 本发明涉及一种路径搜索装置和采用该路径搜索装置的CDMA接收机，其具有减小的电路规模并且操作以执行较少数量的操作。 对于直接扩频CDMA通信系统，CDMA接收机包括接收解调器，包括天线，高频放大器，带通滤波器，解调器等。CDMA接收机还具有解扩单元，确定单元和路径搜索 设备。 路径搜索装置具有采样单元，用于通过基于芯片速率的整数倍的低速过采样和通过比低速过采样快的高速过采样来对输入信号进行采样，用于找到相关的第一电路 扩展码与由对应于最大相关值的低速过采样和寻找定时提供的信号之间的值。 根据由高速过采样提供的信号与对应于由第一电路提供的定时的扩展码之间的相关值，找到解扩定时的第二电路。
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4.发明授权公开(公告)号：US06853631B1
公开(公告)日：2005-02-08
申请号：US09415997
申请日：1999-10-12
CPC分类号： H04J13/0003 , H04B1/707 , H04B2201/70701 , H04L27/34
摘要： A phase θI1, . . . , θQ1, . . . uniquely determined for each channel is assigned to a carrier for each channel used when data I1 . . . , Q1, . . . , to be distributed among different channels are modulated. By appropriately modifying the phase of a carrier for each channel, signal points can be located in a narrower region than in a conventional region, and thereby the difference in amplitude between a signal point with a minimum amplitude and a signal point with a maximum amplitude can be reduced. Thus, the amplitude range of a signal to be covered by an amplifier for transmitting a transmission signal is reduced, and thereby an amplifier with a linearity that is not high can be used for the amplifier. Accordingly, even if the number of signal points increase, there is no need to use a large high-power amplifier, and thereby the small power and small size of the apparatus can be realized.
摘要翻译： A相位θ1， 。 。 ，thetaQ1，。 。 。 对于每个信道唯一确定的每个信道被分配给用于数据I1时使用的每个信道的载波。 。 。 ，Q1。 。 。 ，被分配在不同的信道之间进行调制。 通过适当地修改每个通道的载波相位，信号点可以位于比常规区域更窄的区域中，从而具有最小振幅的信号点与具有最大振幅的信号点之间的幅度差可以 减少 因此，用于传输发送信号的放大器要覆盖的信号的振幅范围被减小，因此放大器可以使用线性度不高的放大器。 因此，即使信号点的数量增加，也不需要使用大的大功率放大器，从而能够实现装置的小功率和小型化。
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公开(公告)号：US07224720B2
公开(公告)日：2007-05-29
申请号：US10625337
申请日：2003-07-22
申请人： Yasuyuki Oishi , Kazuo Nagatani , Hajime Hamada , Yoshihiko Asano
发明人： Yasuyuki Oishi , Kazuo Nagatani , Hajime Hamada , Yoshihiko Asano
CPC分类号： H04B1/7075 , H04B1/7085 , H04B1/709 , H04B1/7095 , H04B2201/70707
摘要： The present invention reduces the scale of circuitry and shortens the code phase detection time needed to achieve initial synchronization. In a correlator for calculating correlation between a received spreading code contained in a received spread-spectrum signal and a reference spreading code, a combined code generator is included. The combined code generator outputs a combined spreading code by weighting and combining a plurality of phase-shifted reference spreading codes A1–AM. Further, an arithmetic circuit calculates correlation between the received spreading code and the plurality of phase-shifted reference spreading codes simultaneously. A phase detection circuit detects the phase difference between the received spreading code and a reference spreading code, namely the phase of the received spreading code from the results of the arithmetic operation.
摘要翻译： 本发明减小了电路规模，缩短了实现初始同步所需的码相位检测时间。 在用于计算包含在接收扩展频谱信号中的接收扩展码与参考扩展码之间的相关性的相关器中，包括组合码发生器。 组合代码生成器通过加权和组合多个相移参考扩展码A 1 -M M来输出组合的扩展码。 此外，算术电路同时计算接收的扩展码与多个相移参考扩展码之间的相关性。 相位检测电路从算术运算结果检测接收到的扩展码与参考扩展码之间的相位差，即接收到的扩展码的相位。
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公开(公告)号：US6009090A
公开(公告)日：1999-12-28
申请号：US872362
申请日：1997-06-10
CPC分类号： H04B1/707 , H04B2201/70706
摘要： A code multiplexing wireless apparatus for amplifying a code-multiplexed signal and then transmitting the amplified signal includes the following to reduce output back-off, improve the efficiency of a power amplifier and suppress broadening of the frequency spectrum: (1) a code-multiplexed signal generator for multiplying each item of transmission data by a spreading code sequence and combining spread-spectrum modulated signals to generate a code-multiplexed signal, (2) a signal-peak suppressing unit for holding the envelope of the code-multiplexed signal below a set level, and (3) a power amplifier for amplifying the code-multiplexed signal and transmitting the amplified code-multiplexed signal from an antenna.
摘要翻译： 用于放大代码多路复用信号然后发送放大信号的代码复用无线装置包括以下以减少输出回退，提高功率放大器的效率并抑制频谱的扩展：（1）码复用 信号发生器，用于将每个发送数据项乘以扩展码序列，并组合扩频调制信号以产生码复用信号;（2）信号峰值抑制单元，用于将码复用信号的包络保持在低于 设置电平，以及（3）功率放大器，用于放大代码复用信号并从天线发送放大的码复用信号。
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公开(公告)号：US07376114B2
公开(公告)日：2008-05-20
申请号：US10272660
申请日：2002-10-17
CPC分类号： H04J13/0003 , H04B1/707 , H04B2201/70706 , H04J13/0051 , H04J13/18
摘要： A code multiplexing transmitting apparatus spread-spectrum modulates transmission data of a plurality of channels by spreading codes that differ from one another, combines the spread-spectrum signals of each of the channels and transmits the resultant spread-spectrum modulated signal. A spread-spectrum modulating unit for each channel includes a phase shifter for shifting, by a predetermined angle channel by channel, the phase of a position vector of the spread-spectrum modulated signal of each channel. As the result of such phase control, the phases of pilot signal portions of the spread-spectrum modulated signals of the respective channels are shifted relative to one another so that the peak values of the code-multiplexed signal can be suppressed.
摘要翻译： 扩频编码多路复用发送装置通过扩展彼此不同的码来对多个信道的发送数据进行扩频调制，合成各个信道的扩频信号，并发送合成的扩频调制信号。 用于每个通道的扩频调制单元包括移相器，用于以预定的角度逐个通道移位每个通道的扩频调制信号的位置矢量的相位。 作为这种相位控制的结果，各通道的扩频调制信号的导频信号部分的相位彼此相对移位，从而可以抑制码复用信号的峰值。
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公开(公告)号：US06791965B2
公开(公告)日：2004-09-14
申请号：US10272635
申请日：2002-10-17
IPC分类号： H04B7216
CPC分类号： H04J13/00 , H04B1/707 , H04B2201/70701 , H04B2201/70706 , H04J13/0051 , H04J13/12
摘要： A code multiplexing transmitting apparatus spread-spectrum modulates transmission data of a plurality of channels by spreading codes that differ from one another, combines the spread-spectrum signals of each of the channels and transmits the resultant spread-spectrum modulated signal. A spread-spectrum modulating unit for each channel includes a phase shifter for shifting, by a predetermined angle channel by channel, the phase of a position vector of the spread-spectrum modulated signal of each channel. As the result of such phase control, the phases of pilot signal portions of the spread-spectrum modulated signals of the respective channels are shifted relative to one another so that the peak values of the code-multiplexed signal can be suppressed.
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公开(公告)号：US06650689B1
公开(公告)日：2003-11-18
申请号：US09318446
申请日：1999-05-25
申请人： Yasuyuki Oishi , Kazuo Nagatani , Hajime Hamada , Yoshihiko Asano
发明人： Yasuyuki Oishi , Kazuo Nagatani , Hajime Hamada , Yoshihiko Asano
IPC分类号： H04B1500
CPC分类号： H04B1/7075 , H04B1/7085 , H04B1/709 , H04B1/7095 , H04B2201/70707
摘要： The present invention reduces the scale of circuitry and shortens the code phase detection time needed to achieve initial synchronization. In a correlator for calculating correlation between a received spreading code contained in a received spread-spectrum signal and a reference spreading code, a combined code generator is included. The combined code generator outputs a combined spreading code by weighting and combining a plurality of phase-shifted reference spreading codes A1-AM. Further, an arithmetic circuit calculates correlation between the received spreading code and the plurality of phase-shifted reference spreading codes simultaneously. A phase detection circuit detects the phase difference between the received spreading code and a reference spreading code, namely the phase of the received spreading code from the results of the arithmetic operation.
摘要翻译： 本发明减小了电路规模，缩短了实现初始同步所需的码相位检测时间。 在用于计算包含在接收扩展频谱信号中的接收扩展码与参考扩展码之间的相关性的相关器中，包括组合码发生器。 组合码发生器通过加权和组合多个相移参考扩展码A1-AM来输出组合扩展码。 此外，算术电路同时计算接收的扩展码与多个相移参考扩展码之间的相关性。 相位检测电路从算术运算结果检测接收到的扩展码与参考扩展码之间的相位差，即接收到的扩展码的相位。
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公开(公告)号：US6097714A
公开(公告)日：2000-08-01
申请号：US872358
申请日：1997-06-10
IPC分类号： H04L27/20 , H04B1/707 , H04B1/7097 , H04J13/00 , H04J13/12 , H04B7/216 , H04B15/00 , H04Q7/28
CPC分类号： H04J13/00 , H04B1/707 , H04J13/0051 , H04B2201/70701 , H04B2201/70706 , H04J13/12
摘要： A code multiplexing transmitting apparatus spread-spectrum modulates transmission data of a plurality of channels by spreading codes that differ from one another, combines the spread-spectrum signals of each of the channels and transmits the resultant spread-spectrum modulated signal. A spread-spectrum modulating unit for each channel includes a phase shifter for shifting, by a predetermined angle channel by channel, the phase of a position vector of the spread-spectrum modulated signal of each channel. As the result of such phase control, the phases of pilot signal portions of the spread-spectrum modulated signals of the respective channels are shifted relative to one another so that the peak values of the code-multiplexed signal can be suppressed.
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