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1. 发明授权

US07809086B2 Apparatus and methods for demodulating a signal 有权
标题翻译：用于解调信号的装置和方法
公开(公告)号：US07809086B2
公开(公告)日：2010-10-05
申请号：US11836141
申请日：2007-08-08
申请人： Wang Tingwu , Pan Ju Yan , Yu Yang , Hu Saigui , Tomisawa Masayuki
发明人： Wang Tingwu , Pan Ju Yan , Yu Yang , Hu Saigui , Tomisawa Masayuki
IPC分类号： H03K9/00 , H04L27/00
CPC分类号： H04L27/233 , H04L27/0014 , H04L27/22 , H04L27/2275 , H04L2027/0026
摘要： An apparatus for demodulating an analogue input signal comprises a hard limiter stage (4) for converting the signal to a two level signal. A digital down converter/low pass filter stage (6) converts the signal to a base band signal, and a symbol synchronization stage (8) extracts symbol timing. An instantaneous phase detector (10) calculates the instantaneous phase of the one or more symbols associated with the input signal. If the input signal has been modulated according to a pi/4DQPSK, pi/2DBPSK, GMSK, or a GFSK modulation scheme, a differential detector (12) determines a difference in the phase between adjacent symbols, a coarse frequency offset compensation stage (14) applies a compensation signal to compensate for frequency offset, and a frequency offset estimation stage (16) updates this compensation signal. A demapper (18) generates a demodulated output signal after compensation by the frequency offset compensation stage.
摘要翻译：用于解调模拟输入信号的装置包括用于将信号转换为两电平信号的硬限幅器级（4）。数字下变频器/低通滤波器级（6）将信号转换为基带信号，符号同步级（8）提取符号定时。瞬时相位检测器（10）计算与输入信号相关联的一个或多个符号的瞬时相位。如果输入信号已经根据pi / 4DQPSK，pi / 2DBPSK，GMSK或GFSK调制方案调制，则差分检测器（12）确定相邻符号之间的相位差，粗频率偏移补偿级（14 ）施加补偿信号以补偿频率偏移，并且频率偏移估计级（16）更新该补偿信号。解映射器（18）通过频率偏移补偿级在补偿后产生解调输出信号。

2. 发明申请

US20080061870A1 APPARATUS AND METHODS FOR DEMODULATING A SIGNAL 有权
标题翻译：用于解调信号的装置和方法
公开(公告)号：US20080061870A1
公开(公告)日：2008-03-13
申请号：US11836141
申请日：2007-08-08
申请人： Wang Tingwu , Pan Ju Yan , Yu Yang , Hu Saigui , Tomisawa Masayuki
发明人： Wang Tingwu , Pan Ju Yan , Yu Yang , Hu Saigui , Tomisawa Masayuki
IPC分类号： H04L27/22
CPC分类号： H04L27/233 , H04L27/0014 , H04L27/22 , H04L27/2275 , H04L2027/0026
摘要： An apparatus for demodulating an analogue input signal comprises a hard limiter stage (4) for converting the signal to a two level signal, A digital down converter/low pass filter stage (6) converts the signal to a base band signal, and a symbol synchronization stage (8) extracts symbol timing. An instantaneous phase detector (10) calculates the instantaneous phase of the one or more symbols associated with the input signal. If the input signal has been modulated according to a pi/4DQPSK, pi/2DBPSK, GMSK, or a GFSK modulation scheme, a differential detector (12) determines a difference in the phase between adjacent symbols, a coarse frequency offset compensation stage (14) applies a compensation signal to compensate for frequency offset, and a frequency offset estimation stage (16) updates this compensation signal. A demapper (18) generates a demodulated output signal after compensation by the frequency offset compensation stage.
摘要翻译：用于解调模拟输入信号的装置包括用于将信号转换为二电平信号的硬限幅器级（4），A数字下变频器/低通滤波器级（6）将信号转换为基带信号，以及符号同步级（8）提取符号定时。瞬时相位检测器（10）计算与输入信号相关联的一个或多个符号的瞬时相位。如果输入信号已经根据pi / 4DQPSK，pi / 2DBPSK，GMSK或GFSK调制方案调制，则差分检测器（12）确定相邻符号之间的相位差，粗频率偏移补偿级（14 ）施加补偿信号以补偿频率偏移，并且频率偏移估计级（16）更新该补偿信号。解映射器（18）通过频率偏移补偿级在补偿后产生解调输出信号。

3. 发明申请

US20080062029A1 APPARATUS AND METHOD FOR DEMODULATING A MODULATED SIGNAL 有权
标题翻译：用于调制调制信号的装置和方法
公开(公告)号：US20080062029A1
公开(公告)日：2008-03-13
申请号：US11836138
申请日：2007-08-08
申请人： Xu Changqing , Li Zhiping , Hu Saigui , Tan Kai Ren , Wang Tingwu , Tomisawa Masayuki
发明人： Xu Changqing , Li Zhiping , Hu Saigui , Tan Kai Ren , Wang Tingwu , Tomisawa Masayuki
IPC分类号： H03M1/12
CPC分类号： H04L27/2075 , H04L27/0014
摘要： An apparatus for demodulating a modulated signal comprises an analog to digital converter (2, 12) for converting an analog modulated input signal to a digital signal. The analog to digital converter is arranged to sample the input signal at a predetermined sampling rate. A digital down converter (4, 14) then receives the digital signal at the sampling rate. The digital down converter has an associated digital intermediate frequency and reduces the frequency of the digital signal to one quarter of the sampling rate. A low pass filter (6, 16) filters selected frequencies from the digital signal. A frequency offset stage (8, 18) applies a modification to the frequency of the filtered signal to reduce frequency offset therein, and a differential demodulator (10, 20) demodulates the signal after modifying the frequency to reduce the frequency offset. There is also disclosed a method for demodulating a signal.
摘要翻译：用于解调调制信号的装置包括用于将模拟调制输入信号转换为数字信号的模数转换器（2,12）。模数转换器被布置成以预定的采样速率对输入信号进行采样。数字降压转换器（4,14）然后以采样速率接收数字信号。数字下变频器具有相关的数字中频，并将数字信号的频率降低到采样率的四分之一。低通滤波器（6,16）从数字信号滤波所选择的频率。频率偏移级（8,18）对经滤波的信号的频率进行修改以减少其中的频率偏移，并且差分解调器（10,20）在修改频率之后对该信号进行解调以降低频率偏移。还公开了一种解调信号的方法。

4. 发明授权

US07541966B2 Apparatus and method for demodulating a modulated signal 有权
标题翻译：用于解调调制信号的装置和方法
公开(公告)号：US07541966B2
公开(公告)日：2009-06-02
申请号：US11836138
申请日：2007-08-08
申请人： Xu Changqing , Li Zhiping , Hu Saigui , Tan Kai Ren , Wang Tingwu , Tomisawa Masayuki
发明人： Xu Changqing , Li Zhiping , Hu Saigui , Tan Kai Ren , Wang Tingwu , Tomisawa Masayuki
IPC分类号： G08C19/12
CPC分类号： H04L27/2075 , H04L27/0014
摘要： An apparatus for demodulating a modulated signal comprises an analog to digital converter (2, 12) for converting an analog modulated input signal to a digital signal. The analog to digital converter is arranged to sample the input signal at a predetermined sampling rate. A digital down converter (4, 14) then receives the digital signal at the sampling rate. The digital down converter has an associated digital intermediate frequency and reduces the frequency of the digital signal to one quarter of the sampling rate. A low pass filter (6, 16) filters selected frequencies from the digital signal. A frequency offset stage (8, 18) applies a modification to the frequency of the filtered signal to reduce frequency offset therein, and a differential demodulator (10, 20) demodulates the signal after modifying the frequency to reduce the frequency offset. There is also disclosed a method for demodulating a signal.
摘要翻译：用于解调调制信号的装置包括用于将模拟调制输入信号转换为数字信号的模数转换器（2,12）。模数转换器被布置成以预定的采样速率对输入信号进行采样。数字降压转换器（4,14）然后以采样速率接收数字信号。数字下变频器具有相关的数字中频，并将数字信号的频率降低到采样率的四分之一。低通滤波器（6,16）从数字信号滤波所选择的频率。频率偏移级（8,18）对经滤波的信号的频率进行修改以减少其中的频率偏移，并且差分解调器（10,20）在修改频率之后解调该信号以减少频率偏移。还公开了一种解调信号的方法。

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