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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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2.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：US06198731B1
公开(公告)日：2001-03-06
申请号：US08995252
申请日：1997-12-19
IPC分类号： H04B7216
CPC分类号： H04B1/707 , H04B7/2628
摘要： There are disclosed a radiocommunication apparatus and a radiocommunication system. There are provided a receiving section capable of receiving a plurality of types of signals which have been spread through use of different spread code information according to a CDMA scheme in a transmitting-side radiocommunication apparatuses; and a spread demodulation section which carries out despread processing for the common signal portions of the plurality of types of signals received by the receiving section through use of a composite spread code formed from a plurality of spread codes. Accordingly, it becomes possible to significantly improve the quality of received signals.
摘要翻译： 公开了一种无线电通信装置和无线电通信系统。 提供了一种能够在发送侧无线电通信装置中接收根据CDMA方案通过使用不同扩展码信息而扩展的多种类型的信号的接收部分; 以及扩展解调部分，通过使用由多个扩展码形成的复合扩展码，对由接收部分接收的多种类型的信号的公共信号部分进行解扩处理。 因此，可以显着提高接收信号的质量。
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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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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：US06826169B1
公开(公告)日：2004-11-30
申请号：US09615862
申请日：2000-07-13
IPC分类号： H04L512
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：US6028894A
公开(公告)日：2000-02-22
申请号：US923839
申请日：1997-09-04
CPC分类号： H04B1/1027 , H04B17/21 , H04B17/336 , H04L1/20 , H04W52/24 , H04W52/08
摘要： SIR measurement for measuring S/N ratio, which is the ratio of a desired signal power to noise power, or S/I ratio, which is the ratio of desired signal power to interference signal power, uses a signal-point position altering unit for taking absolute values of an I component (in-phase component) and Q component (quadrature component) of a received signal to convert the received signal to a signal in the first quadrant of an I-Q orthogonal coordinate system, and for squaring the average value of the converted signal to obtain first average power (desired power) S, a received-power arithmetic unit for calculating the average value of the square of the received signal to obtain second average power, and for subtracting the desired power S from the received power to obtain noise power or interference power I, and a SIR arithmetic unit for calculating S/N ratio or S/I ratio from the desired signal power S and noise power or interference signal power I, and for outputting the ratio calculated.
摘要翻译： 作为所需信号功率与噪声功率的比值的S / N比的SIR测量值或作为期望信号功率与干扰信号功率之比的S / I比使用信号点位置改变单元 将接收信号的I分量（同相分量）和Q分量（正交分量）的绝对值转换为IQ正交坐标系的第一象限中的信号，并将平均值 转换后的信号获得第一平均功率（期望功率）S，接收功率算术单元，用于计算接收信号的平方的平均值以获得第二平均功率，并且从接收功率中减去所需功率S 获得噪声功率或干扰功率I，以及用于根据期望信号功率S和噪声功率或干扰信号功率I计算S / N比或S / I比的SIR算术单元，并且用于输出比率计算 ed。
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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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