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1. 发明申请

US20100111240A1 Method to Track a Target Frequency of an Input Signal 有权
标题翻译：跟踪输入信号目标频率的方法
公开(公告)号：US20100111240A1
公开(公告)日：2010-05-06
申请号：US12264985
申请日：2008-11-05
申请人： Pei-Jun Shih , Tien-Ju Tsai , Jeng-Shiann Jiang
发明人： Pei-Jun Shih , Tien-Ju Tsai , Jeng-Shiann Jiang
IPC分类号： H03D3/24
CPC分类号： H03D3/007 , H03D3/004
摘要： A digital demodulator adapted in a receiver and a digital demodulation method are provided. The digital demodulator comprises: a phase splitter, a complex multiplier, an AFC, a limiter, a phase detector, a re-tracker, a post-multiplier and an oscillator. The phase splitter generates a complex signal from the input signal. The complex multiplier multiplies the complex signal by both first and second phase signals to generate first and second base band signals. The AFC generates a first output signal. The limiter generates a trend signal and the re-tracker generates a tuning signal from the first output signal. The phase detector multiplies the trend and second base signal and adjusts the multiplied signal based on the tuning signal. The oscillator generates the first and second phase signals according to the output of the phase detector. The post-multiplier multiplies the trend signal by the first and second base band signals for output.
摘要翻译：提供一种适用于接收机的数字解调器和数字解调方法。数字解调器包括：分相器，复数乘法器，AFC，限幅器，相位检测器，重新跟踪器，后乘法器和振荡器。相位分离器从输入信号产生复信号。复数乘法器将复信号乘以第一和第二相位信号，以产生第一和第二基带信号。 AFC产生第一个输出信号。限幅器产生趋势信号，重新跟踪器从第一个输出信号产生一个调谐信号。相位检测器将趋势和第二基准信号相乘，并根据调谐信号调整相乘的信号。振荡器根据相位检测器的输出产生第一和第二相位信号。后乘法器将趋势信号乘以第一和第二基带信号用于输出。

2. 发明授权

US08139687B2 Method to track a target frequency of an input signal 有权
标题翻译：跟踪输入信号的目标频率的方法
公开(公告)号：US08139687B2
公开(公告)日：2012-03-20
申请号：US12264985
申请日：2008-11-05
申请人： Pei-Jun Shih , Tien-Ju Tsai , Jeng-Shiann Jiang
发明人： Pei-Jun Shih , Tien-Ju Tsai , Jeng-Shiann Jiang
IPC分类号： H04L27/00 , H04L27/22 , H03D3/24
CPC分类号： H03D3/007 , H03D3/004
摘要： A digital demodulator adapted in a receiver and a digital demodulation method are provided. The digital demodulator includes: a phase splitter, a complex multiplier, an AFC, a limiter, a phase detector, a re-tracker, a post-multiplier and an oscillator. The phase splitter generates a complex signal from the input signal. The complex multiplier multiplies the complex signal by both first and second phase signals to generate first and second base band signals. The AFC generates a first output signal. The limiter generates a trend signal and the re-tracker generates a tuning signal from the first output signal. The phase detector multiplies the trend and second base signal and adjusts the multiplied signal based on the tuning signal. The oscillator generates the first and second phase signals according to the output of the phase detector. The post-multiplier multiplies the trend signal by the first and second base band signals for output.
摘要翻译：提供了一种适用于接收机的数字解调器和数字解调方法。数字解调器包括：分相器，复数乘法器，AFC，限幅器，相位检测器，重新跟踪器，后乘法器和振荡器。相位分离器从输入信号产生复信号。复数乘法器将复信号乘以第一和第二相位信号，以产生第一和第二基带信号。 AFC产生第一个输出信号。限幅器产生趋势信号，重新跟踪器从第一个输出信号产生一个调谐信号。相位检测器将趋势和第二基准信号相乘，并根据调谐信号调整相乘的信号。振荡器根据相位检测器的输出产生第一和第二相位信号。后乘法器将趋势信号乘以第一和第二基带信号用于输出。

3. 发明授权

US08045649B2 Carrier recovery system and carrier recovery method 有权
标题翻译：载波恢复系统和载波恢复方法
公开(公告)号：US08045649B2
公开(公告)日：2011-10-25
申请号：US12036330
申请日：2008-02-25
申请人： Pei-Jun Shih , Jeng-Shiann Jiang
发明人： Pei-Jun Shih , Jeng-Shiann Jiang
IPC分类号： H04L27/00
CPC分类号： H04L27/3827 , H04L2027/0038 , H04L2027/0055 , H04L2027/0079 , H04L2027/0085
摘要： The invention provides carrier recovery systems and carrier recovery methods. The carrier recovery system comprises a compensation signal generator, a compensation device and a mode selector. The compensation signal generator generates a compensation signal based on a coherent demodulated signal. In a first mode, the compensate device is couple behind an equalizer; the coherent demodulated signal is generated by the compensation device which compensates the output of the equalizer with the compensation signal. In a second mode, the compensate device is coupled prior to the equalizer, compensating the output of a synchronizer with the compensation signal to generate the input of the equalizer. In the second mode, the compensation signal generator receives the output of the equalizer as the coherent demodulated signal. The mode selector switches the carrier recover system from the first mode to the second mode when an estimated frequency offset satisfies a first criterion.
摘要翻译：本发明提供载体回收系统和载体回收方法。载波恢复系统包括补偿信号发生器，补偿装置和模式选择器。补偿信号发生器基于相干解调信号产生补偿信号。在第一模式中，补偿装置耦合在均衡器之后; 相干解调信号由补偿装置产生，补偿装置用补偿信号补偿均衡器的输出。在第二模式中，补偿装置在均衡器之前被耦合，用补偿信号补偿同步器的输出以产生均衡器的输入。在第二模式中，补偿信号发生器接收均衡器的输出作为相干解调信号。当估计的频率偏移满足第一准则时，模式选择器将载波恢复系统从第一模式切换到第二模式。

4. 发明授权

US08107014B2 Digital receiver and method thereof 有权
标题翻译：数字接收机及其方法
公开(公告)号：US08107014B2
公开(公告)日：2012-01-31
申请号：US12399985
申请日：2009-03-09
申请人： Jeng-Shiann Jiang , Pei-Jun Shih , Kuan-Hung Chen
发明人： Jeng-Shiann Jiang , Pei-Jun Shih , Kuan-Hung Chen
IPC分类号： H04N5/52 , H04N5/44
CPC分类号： H04N5/4401 , H03M1/185 , H04N5/52 , H04N21/4382 , H04N21/4383
摘要： A digital receiver includes an analog front-end circuit, an automatic-gain controller, a compensation circuit, and a demodulator. The analog front-end circuit receives an input signal, adjusts an average amplitude of the input signal, and converts the adjusted input signal to generate a digital signal according to a control signal. The automatic-gain controller is coupled to the analog front-end circuit for generating the control signal feedback to the analog front-end circuit according to the digital signal. The compensation circuit is coupled to the analog front-end circuit for detecting an average amplitude of the digital signal to generate a detecting result and for determining whether to compensate the average amplitude of the digital signal to generate a compensated digital signal according to the detecting result. The demodulator is coupled to the compensation circuit for demodulating the compensated digital signal to generate an output signal.
摘要翻译：数字接收机包括模拟前端电路，自动增益控制器，补偿电路和解调器。模拟前端电路接收输入信号，调整输入信号的平均幅度，并根据控制信号转换调整后的输入信号以产生数字信号。自动增益控制器耦合到模拟前端电路，用于根据数字信号产生对模拟前端电路的控制信号反馈。补偿电路耦合到模拟前端电路，用于检测数字信号的平均幅度以产生检测结果，并且用于根据检测结果确定是否补偿数字信号的平均幅度以产生补偿的数字信号。解调器耦合到补偿电路，用于解调补偿的数字信号以产生输出信号。

5. 发明申请

US20090213921A1 CARRIER RECOVERY SYSTEM AND CARRIER RECOVERY METHOD 有权
标题翻译：载波恢复系统和载波恢复方法
公开(公告)号：US20090213921A1
公开(公告)日：2009-08-27
申请号：US12036330
申请日：2008-02-25
申请人： Pei-Jun Shih , Jeng-Shiann Jiang
发明人： Pei-Jun Shih , Jeng-Shiann Jiang
IPC分类号： H04L27/01
CPC分类号： H04L27/3827 , H04L2027/0038 , H04L2027/0055 , H04L2027/0079 , H04L2027/0085
摘要： The invention provides carrier recovery systems and carrier recovery methods. The carrier recovery system comprises a compensation signal generator, a compensation device and a mode selector. The compensation signal generator generates a compensation signal based on a coherent demodulated signal. In a first mode, the compensate device is couple behind an equalizer; the coherent demodulated signal is generated by the compensation device which compensates the output of the equalizer with the compensation signal. In a second mode, the compensate device is coupled prior to the equalizer, compensating the output of a synchronizer with the compensation signal to generate the input of the equalizer. In the second mode, the compensation signal generator receives the output of the equalizer as the coherent demodulated signal. The mode selector switches the carrier recover system from the first mode to the second mode when an estimated frequency offset satisfies a first criterion.
摘要翻译：本发明提供载体回收系统和载体回收方法。载波恢复系统包括补偿信号发生器，补偿装置和模式选择器。补偿信号发生器基于相干解调信号产生补偿信号。在第一模式中，补偿装置耦合在均衡器之后; 相干解调信号由补偿装置产生，补偿装置用补偿信号补偿均衡器的输出。在第二模式中，补偿装置在均衡器之前被耦合，用补偿信号补偿同步器的输出以产生均衡器的输入。在第二模式中，补偿信号发生器接收均衡器的输出作为相干解调信号。当估计的频率偏移满足第一准则时，模式选择器将载波恢复系统从第一模式切换到第二模式。

6. 发明申请

US20100225822A1 DIGITAL RECEIVER AND METHOD THEREOF 有权
标题翻译：数字接收机及其方法
公开(公告)号：US20100225822A1
公开(公告)日：2010-09-09
申请号：US12399985
申请日：2009-03-09
申请人： Jeng-Shiann Jiang , Pei-Jun Shih , Kuan-Hung Chen
发明人： Jeng-Shiann Jiang , Pei-Jun Shih , Kuan-Hung Chen
IPC分类号： H04N5/52 , H03M1/06 , H04N5/44
CPC分类号： H04N5/4401 , H03M1/185 , H04N5/52 , H04N21/4382 , H04N21/4383
摘要： A digital receiver includes an analog front-end circuit, an automatic-gain controller, a compensation circuit, and a demodulator. The analog front-end circuit receives an input signal, adjusts an average amplitude of the input signal, and converts the adjusted input signal to generate a digital signal according to a control signal. The automatic-gain controller is coupled to the analog front-end circuit for generating the control signal feedback to the analog front-end circuit according to the digital signal. The compensation circuit is coupled to the analog front-end circuit for detecting an average amplitude of the digital signal to generate a detecting result and for determining whether to compensate the average amplitude of the digital signal to generate a compensated digital signal according to the detecting result. The demodulator is coupled to the compensation circuit for demodulating the compensated digital signal to generate an output signal.
摘要翻译：数字接收机包括模拟前端电路，自动增益控制器，补偿电路和解调器。模拟前端电路接收输入信号，调整输入信号的平均幅度，并根据控制信号转换调整后的输入信号以产生数字信号。自动增益控制器耦合到模拟前端电路，用于根据数字信号产生对模拟前端电路的控制信号反馈。补偿电路耦合到模拟前端电路，用于检测数字信号的平均幅度以产生检测结果，并且用于根据检测结果确定是否补偿数字信号的平均幅度以产生补偿的数字信号。解调器耦合到补偿电路，用于解调补偿的数字信号以产生输出信号。

7. 发明授权

US08451386B2 Digital intermediate frequency demodulator 有权
标题翻译：数字中频解调器
公开(公告)号：US08451386B2
公开(公告)日：2013-05-28
申请号：US12479912
申请日：2009-06-08
申请人： Tien-Ju Tsai , Pei-Jun Shih
发明人： Tien-Ju Tsai , Pei-Jun Shih
IPC分类号： H04N5/44 , H04N5/455
CPC分类号： H04N5/455 , H04N21/4382
摘要： The invention discloses a digital IF demodulator for processing a digital IF signal converted from a radio frequency (RF) signal, including an NCO, a down conversion circuit, a PIF carrier recovery circuit and a video baseband demodulator. The NCO outputs a sine value and a cosine value. The down conversion circuit outputs a first zero IF signal including a first real part signal and a first imaginary part signal, according to the digital IF signal, the sine value and the cosine value. The PIF carrier recovery circuit outputs a loop error signal for the NCO and a second zero IF signal, according to the first zero IF signal and a video synchronization signal. The video baseband demodulator generates a composite video signal according to the second zero IF signal.
摘要翻译：本发明公开了一种用于处理从包括NCO，下变频电路，PIF载波恢复电路和视频基带解调器的射频（RF）信号转换的数字IF信号的数字IF解调器。 NCO输出正弦值和余弦值。下变频电路根据数字IF信号，正弦值和余弦值输出包括第一实部信号和第一虚部信号的第一零中频信号。 PIF载波恢复电路根据第一零中频信号和视频同步信号输出NCO的环路误差信号和第二零中频信号。视频基带解调器根据第二零IF信号产生复合视频信号。

8. 发明申请

US20100309385A1 DIGITAL INTERMEDIATE FREQUENCY DEMODULATOR 有权
标题翻译：数字中间频率调制解调器
公开(公告)号：US20100309385A1
公开(公告)日：2010-12-09
申请号：US12479912
申请日：2009-06-08
申请人： Tien-Ju Tsai , Pei-Jun Shih
发明人： Tien-Ju Tsai , Pei-Jun Shih
IPC分类号： H04N5/455
CPC分类号： H04N5/455 , H04N21/4382
摘要： The invention discloses a digital IF demodulator for processing a digital IF signal converted from a radio frequency (RF) signal, including an NCO, a down conversion circuit, a PIF carrier recovery circuit and a video baseband demodulator. The NCO outputs a sine value and a cosine value. The down conversion circuit outputs a first zero IF signal including a first real part signal and a first imaginary part signal, according to the digital IF signal, the sine value and the cosine value. The PIF carrier recovery circuit outputs a loop error signal for the NCO and a second zero IF signal, according to the first zero IF signal and a video synchronization signal. The video baseband demodulator generates a composite video signal according to the second zero IF signal.
摘要翻译：本发明公开了一种用于处理从包括NCO，下变频电路，PIF载波恢复电路和视频基带解调器的射频（RF）信号转换的数字IF信号的数字IF解调器。 NCO输出正弦值和余弦值。下变频电路根据数字IF信号，正弦值和余弦值输出包括第一实部信号和第一虚部信号的第一零中频信号。 PIF载波恢复电路根据第一零中频信号和视频同步信号输出NCO的环路误差信号和第二零中频信号。视频基带解调器根据第二零IF信号产生复合视频信号。

9. 发明申请

US20100215126A1 CARRIER RECOVERY APPARATUS AND METHOD THEREOF 有权
标题翻译：载波恢复装置及其方法
公开(公告)号：US20100215126A1
公开(公告)日：2010-08-26
申请号：US12393023
申请日：2009-02-25
申请人： Guo-Hau Gau , Pei-Jun Shih , Shin-Shiuan Cheng
发明人： Guo-Hau Gau , Pei-Jun Shih , Shin-Shiuan Cheng
IPC分类号： H04L27/00
CPC分类号： H04L27/0014 , H04L2027/0024 , H04L2027/0055 , H04L2027/0067 , H04L2027/0073 , H04L2027/0079 , H04L2027/0085 , H04L2027/0087
摘要： A carrier recovery apparatus includes a pilot strength detector, a first lock loop, a second lock loop, and a controller. The pilot strength detector determines whether a pilot strength of an input signal is greater than a threshold value to generate a control signal. The first lock loop performs a first carrier recovery on the input signal. The second lock loop performs a second carrier recovery on the input signal. The controller selectively allows the first lock loop to perform the first carrier recovery on the input signal or the second lock loop to perform the second carrier recovery on the input signal according to the control signal. The first lock loop is a pilot-based FPLL and the second locked loop is a pilot-less PLL.
摘要翻译：载波恢复装置包括导频强度检测器，第一锁定环路，第二锁定环路和控制器。导频强度检测器确定输入信号的导频强度是否大于阈值以产生控制信号。第一个锁定环路对输入信号执行第一个载波恢复。第二锁定环对输入信号执行第二载波恢复。控制器选择性地允许第一锁定环路在输入信号或第二锁定环路上执行第一载波恢复，以根据控制信号在输入信号上执行第二载波恢复。第一个锁定环路是一个基于导频的FPLL，第二个锁定环路是一个无引导的PLL。

10. 发明授权

US08611475B2 Channel estimation and symbol boundary detection method 有权
标题翻译：信道估计和符号边界检测方法
公开(公告)号：US08611475B2
公开(公告)日：2013-12-17
申请号：US13159306
申请日：2011-06-13
申请人： Pei-Jun Shih , Ching-Sheng Ni , Shin-Shiuan Cheng
发明人： Pei-Jun Shih , Ching-Sheng Ni , Shin-Shiuan Cheng
IPC分类号： H03D1/00
CPC分类号： H04L25/0212 , H04L25/0204 , H04L25/0224 , H04L27/2663 , H04L27/2665 , H04L27/2675 , H04L27/2695
摘要： A channel estimation method for use with a received signal by a receiver is disclosed. The received signal comprises multiple data bursts which are transmitted to the receiver via multiple path channels, with each of the data bursts having a plurality of preamble symbols which are decoded. The channel estimation method includes the following steps: firstly, at least one correlation pattern is generated according to the decoded preamble symbols. Then, a cross correlation of the correlation pattern with the received signal is performed to yield at least one correlation result of channel impulse response (CIR). Wherein, the symbol boundary of the received signal is decided according to the correlation result.
摘要翻译：公开了一种与接收机接收的信号一起使用的信道估计方法。所接收的信号包括多个数据脉冲串，其经由多个路径信道被发送到接收机，其中每个数据脉冲串具有被解码的多个前导码符号。信道估计方法包括以下步骤：首先，根据解码的前导符号生成至少一个相关模式。然后，执行相关模式与接收信号的互相关，以产生信道脉冲响应（CIR）的至少一个相关结果。其中，根据相关结果确定接收信号的符号边界。

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