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1. 发明授权

US08812569B2 Digital filter implementation for exploiting statistical properties of signal and coefficients 有权
标题翻译：数字滤波器实现，用于利用信号和系数的统计特性
公开(公告)号：US08812569B2
公开(公告)日：2014-08-19
申请号：US13462116
申请日：2012-05-02
申请人： Parag Naik , Anindya Saha , Gururaj Padaki , Subrahmanya Kondageri Shankaraiah , Saurabh Mishra
发明人： Parag Naik , Anindya Saha , Gururaj Padaki , Subrahmanya Kondageri Shankaraiah , Saurabh Mishra
IPC分类号： G06F17/10 , G06F7/38
CPC分类号： H03H21/0012 , H03H2021/007 , H03H2021/0072 , H03H2218/10
摘要： A method for implementing a digital filter is provided. The method includes (a) determining a bit-width of an incoming data sample of an incoming signal by measuring a distance between a leading zero or one of the incoming data sample and a trailing zero of the incoming data sample. The incoming data sample is obtained by sampling the incoming signal at a pre-defined time interval, (b) obtaining bit-width multipliers with variable bit-widths based on a first probability distribution function (PDF) of bit-widths of incoming data samples, (c) allocating the incoming data sample and a filter coefficient based on the bit-width of the incoming data sample and a bit-width of the filter coefficient to one bit-width multiplier of the bit-width multipliers, and (d) performing a multiply operation of a Multiply and Accumulate (MAC) operation on the one bit-width multiplier to generate an output of the digital filter.
摘要翻译：提供一种实现数字滤波器的方法。该方法包括（a）通过测量输入数据样本的前导零或一个之间的距离以及输入数据样本的尾随零来确定输入信号的输入数据样本的位宽。输入数据样本是通过以预定义的时间间隔对输入信号进行采样而获得的，（b）基于输入数据样本的位宽的第一概率分布函数（PDF））获得具有可变位宽的位宽乘数，（c）基于输入数据样本的位宽和滤波器系数的位宽分配输入数据样本和滤波器系数到位宽乘法器的一个位宽倍数，以及（d）在一个位宽乘数上执行乘法和累加（MAC）运算的乘法运算，以产生数字滤波器的输出。

2. 发明申请

US20120269300A1 DIGITAL DOWNCONVERSION AND FAST CHANNEL SELECTION OF NARROWBAND SIGNALS USING A WIDE BAND RF TUNER 有权
标题翻译：使用宽带射频调谐器的数字眩光和快速通道选择窄带信号
公开(公告)号：US20120269300A1
公开(公告)日：2012-10-25
申请号：US13447089
申请日：2012-04-13
申请人： Subramanian Harish Krishnan , Saurabh Mishra , Parag Naik , Subrahmanya Kondageri Shankaraiah , Gururaj Padaki , Santosh Billava
发明人： Subramanian Harish Krishnan , Saurabh Mishra , Parag Naik , Subrahmanya Kondageri Shankaraiah , Gururaj Padaki , Santosh Billava
IPC分类号： H04B1/10
CPC分类号： H04B1/001
摘要： A wide band receiver to select and demodulate an input signal with single scan spectrum sensing by performing filtering on the input signal in digital domain to achieve improved selectivity and sensitivity is provided. The input signal includes one or more narrowband radio frequency (RF) signals. The wide band receiver includes a wide band tuner that down converts the one or more narrowband RF signals to one or more IF signals. An analog to digital converter (ADC) converts the one or more IF signals to one or more digital signals. A filter rejects out-of-band signals from the one or more digital signals to achieve the improved selectivity. A numeric controlled oscillator (NCO) selects at least one narrowband digital signal from the digital signals based on a phase value obtained from a spectrum selection control unit. A demodulator demodulates the narrowband digital signal to obtain a demodulated digital signal.
摘要翻译：提供了一种宽带接收机，通过对数字域中的输入信号进行滤波来选择和解调具有单扫描频谱感测的输入信号，以实现提高的选择性和灵敏度。输入信号包括一个或多个窄带射频（RF）信号。宽带接收机包括将一个或多个窄带RF信号下变换成一个或多个IF信号的宽带调谐器。模数转换器（ADC）将一个或多个IF信号转换成一个或多个数字信号。滤波器拒绝来自一个或多个数字信号的带外信号以实现改进的选择性。数控振荡器（NCO）基于从频谱选择控制单元获得的相位值，从数字信号中选择至少一个窄带数字信号。解调器解调窄带数字信号以获得解调的数字信号。

3. 发明申请

US20120250750A1 METHOD AND SYSTEM FOR RELIABLE CFO AND STO ESTIMATION IN THE PRESENCE OF TUNER INDUCED IMPAIRMENT 有权
标题翻译：调节器诱导损伤存在的可靠的CFO和STO估计方法与系统
公开(公告)号：US20120250750A1
公开(公告)日：2012-10-04
申请号：US13435945
申请日：2012-03-30
申请人： Saurabh Mishra , Parag Naik , Subrahmanya Kondageri Shankaraiah , S. Harish Krishnan , Gururaj Padaki
发明人： Saurabh Mishra , Parag Naik , Subrahmanya Kondageri Shankaraiah , S. Harish Krishnan , Gururaj Padaki
IPC分类号： H04B17/00
CPC分类号： H04L27/0014 , H04L2027/003 , H04L2027/0065
摘要： A system and method for reducing implementation complexity for estimation of a Carrier Frequency Offset (CFO) and a Symbol Timing Offset (STO) for an input signal for spectrally shaped multiple communication standards. The system is implemented by replacing multiplier with shifters. The system includes a CFO estimation block, a STO estimation block, and a band extraction block that extracts a lower band edge and an upper band edge of the input signal. The STO estimation block includes (i) a sample error generation block that computes a sampling timing error value, and (ii) a Phase Lock Loop block that estimates a frequency error and a phase error corresponding to the sampling timing error value. The CFO estimation block includes (i) a carrier offset error generation block that generates a carrier offset error value, and (ii) a leaky average block for performing a filter operation.
摘要翻译：用于降低用于频谱形状的多通信标准的输入信号的载波频偏（CFO）和符号定时偏移（STO）的实现复杂度的系统和方法。该系统通过用移位器替换乘法器来实现。该系统包括CFO估计块，STO估计块和提取输入信号的较低频带边沿和上边带边缘的频带提取块。 STO估计块包括（i）计算采样定时误差值的采样误差产生块，以及（ii）估计与采样定时误差值对应的频率误差和相位误差的锁相环块。 CFO估计块包括（i）产生载波偏移误差值的载波偏移误差产生块，和（ii）用于执行滤波操作的泄漏平均块。

4. 发明授权

US08611471B2 Method and system for reliable CFO and STO estimation in the presence of tuner induced impairment 有权
标题翻译：在调谐器诱发损伤的情况下可靠的CFO和STO估计的方法和系统
公开(公告)号：US08611471B2
公开(公告)日：2013-12-17
申请号：US13435945
申请日：2012-03-30
申请人： Saurabh Mishra , Parag Naik , Subrahmanya Kondageri Shankaraiah , S Harish Krishnan , Gururaj Padaki
发明人： Saurabh Mishra , Parag Naik , Subrahmanya Kondageri Shankaraiah , S Harish Krishnan , Gururaj Padaki
IPC分类号： H04L27/00
CPC分类号： H04L27/0014 , H04L2027/003 , H04L2027/0065
摘要： A system and method for reducing implementation complexity for estimation of a Carrier Frequency Offset (CFO) and a Symbol Timing Offset (STO) for an input signal for spectrally shaped multiple communication standards. The system is implemented by replacing multiplier with shifters. The system includes a CFO estimation block, a STO estimation block, and a band extraction block that extracts a lower band edge and an upper band edge of the input signal. The STO estimation block includes (i) a sample error generation block that computes a sampling timing error value, and (ii) a Phase Lock Loop block that estimates a frequency error and a phase error corresponding to the sampling timing error value. The CFO estimation block includes (i) a carrier offset error generation block that generates a carrier offset error value, and (ii) a leaky average block for performing a filter operation.
摘要翻译：用于降低用于频谱形状的多通信标准的输入信号的载波频偏（CFO）和符号定时偏移（STO）的实现复杂度的系统和方法。该系统通过用移位器替换乘法器来实现。该系统包括CFO估计块，STO估计块和提取输入信号的较低频带边沿和上边带边缘的频带提取块。 STO估计块包括（i）计算采样定时误差值的采样误差产生块，以及（ii）估计与采样定时误差值对应的频率误差和相位误差的锁相环块。 CFO估计块包括（i）产生载波偏移误差值的载波偏移误差产生块，和（ii）用于执行滤波操作的泄漏平均块。

5. 发明授权

US08644429B2 Digital downconversion and fast channel selection of narrowband signals using a wide band RF tuner 有权
标题翻译：使用宽带RF调谐器的数字下变频和窄频信号的快速通道选择
公开(公告)号：US08644429B2
公开(公告)日：2014-02-04
申请号：US13447089
申请日：2012-04-13
申请人： Subramanian Harish Krishnan , Saurabh Mishra , Parag Naik , Subrahmanya Kondageri Shankaraiah , Gururaj Padki , Santosh Billava
发明人： Subramanian Harish Krishnan , Saurabh Mishra , Parag Naik , Subrahmanya Kondageri Shankaraiah , Gururaj Padki , Santosh Billava
IPC分类号： H04L27/06
CPC分类号： H04B1/001
摘要： A wide band receiver to select and demodulate an input signal with single scan spectrum sensing by performing filtering on the input signal in digital domain to achieve improved selectivity and sensitivity is provided. The input signal includes one or more narrowband radio frequency (RF) signals. The wide band receiver includes a wide band tuner that down converts the one or more narrowband RF signals to one or more IF signals. An analog to digital converter (ADC) converts the one or more IF signals to one or more digital signals. A filter rejects out-of-band signals from the one or more digital signals to achieve the improved selectivity. A numeric controlled oscillator (NCO) selects at least one narrowband digital signal from the digital signals based on a phase value obtained from a spectrum selection control unit. A demodulator demodulates the narrowband digital signal to obtain a demodulated digital signal.
摘要翻译：提供了一种宽带接收机，通过对数字域中的输入信号进行滤波来选择和解调具有单扫描频谱感测的输入信号，以实现提高的选择性和灵敏度。输入信号包括一个或多个窄带射频（RF）信号。宽带接收机包括将一个或多个窄带RF信号下变换成一个或多个IF信号的宽带调谐器。模数转换器（ADC）将一个或多个IF信号转换成一个或多个数字信号。滤波器拒绝来自一个或多个数字信号的带外信号以实现改进的选择性。数控振荡器（NCO）基于从频谱选择控制单元获得的相位值，从数字信号中选择至少一个窄带数字信号。解调器解调窄带数字信号以获得解调的数字信号。

6. 发明授权

US08676140B2 Efficient scheme for automatic gain control in communication systems 有权
标题翻译：通信系统中自动增益控制的高效方案
公开(公告)号：US08676140B2
公开(公告)日：2014-03-18
申请号：US13434671
申请日：2012-03-29
申请人： Subramanian Harish Krishnan , Parag Naik , Abdul Aziz , Subrahmanya Kondageri Shankaraiah
发明人： Subramanian Harish Krishnan , Parag Naik , Abdul Aziz , Subrahmanya Kondageri Shankaraiah
IPC分类号： H04B1/16
CPC分类号： H03G3/3078 , H03G3/3068
摘要： A system for controlling an RF gain of a receiver that reduces a time taken to maintain an input signal level at an optimum dynamic range is provided. The system includes a tuner that receives a radio frequency (RF) signal and down-converts the RF signal to an intermediate frequency (IF) signal, and a demodulator. The tuner includes a radio frequency programmable gain amplifier (RF_VGA), a filter and an IF programmable gain amplifier (IF_VGA). The demodulator includes an analog to digital converter (ADC), and an Automatic Gain Control (AGC) unit that (i) receives a digital signal and an IF gain of the IF_VGA. The ADC samples a filtered IF signal under oversampling conditions to obtain an oversampled signal that includes an in-band signal and an out-of-band signal. The AGC unit (ii) controls the RF_VGA, the IF_VGA and (iii) measures an RF energy of the RF signal.
摘要翻译：提供一种用于控制接收机的RF增益的系统，其减少了将输入信号电平维持在最佳动态范围所花费的时间。该系统包括接收射频（RF）信号并将RF信号下变频为中频（IF）信号的调谐器和解调器。调谐器包括射频可编程增益放大器（RF_VGA），滤波器和IF可编程增益放大器（IF_VGA）。解调器包括模数转换器（ADC）和自动增益控制（AGC）单元，其（i）接收IF_VGA的数字信号和IF增益。 ADC在过采样条件下对滤波的IF信号进行采样，以获得包括带内信号和带外信号的过采样信号。 AGC单元（ii）控制RF_VGA，IF_VGA和（iii）测量RF信号的RF能量。

7. 发明申请

US20120252389A1 EFFICIENT SCHEME FOR AUTOMATIC GAIN CONTROL IN COMMUNICATION SYSTEMS 有权
标题翻译：通信系统中自动增益控制的有效方案
公开(公告)号：US20120252389A1
公开(公告)日：2012-10-04
申请号：US13434671
申请日：2012-03-29
申请人： Subramanian Harish Krishnan , Parag Naik , Abdul Aziz , Subrahmanya Kondageri Shankaraiah
发明人： Subramanian Harish Krishnan , Parag Naik , Abdul Aziz , Subrahmanya Kondageri Shankaraiah
IPC分类号： H04B1/16
CPC分类号： H03G3/3078 , H03G3/3068
摘要： A system for controlling an RF gain of a receiver that reduces a time taken to maintain an input signal level at an optimum dynamic range is provided. The system includes a tuner that receives a radio frequency (RF) signal and down-converts the RF signal to an intermediate frequency (IF) signal, and a demodulator. The tuner includes a radio frequency programmable gain amplifier (RF_VGA), a filter and an IF programmable gain amplifier (IF_VGA). The demodulator includes an analog to digital converter (ADC), and an Automatic Gain Control (AGC) unit that (i) receives a digital signal and an IF gain of the IF_VGA. The ADC samples a filtered IF signal under oversampling conditions to obtain an oversampled signal that includes an in-band signal and an out-of-band signal. The AGC unit (ii) controls the RF_VGA, the IF_VGA and (iii) measures an RF energy of the RF signal.
摘要翻译：提供一种用于控制接收机的RF增益的系统，其减少了将输入信号电平维持在最佳动态范围所花费的时间。该系统包括接收射频（RF）信号并将RF信号下变频为中频（IF）信号的调谐器和解调器。调谐器包括射频可编程增益放大器（RF_VGA），滤波器和IF可编程增益放大器（IF_VGA）。解调器包括模数转换器（ADC）和自动增益控制（AGC）单元，其（i）接收IF_VGA的数字信号和IF增益。 ADC在过采样条件下对滤波的IF信号进行采样，以获得包括带内信号和带外信号的过采样信号。 AGC单元（ii）控制RF_VGA，IF_VGA和（iii）测量RF信号的RF能量。

8. 发明授权

US08611472B2 Carrier frequency offset estimation scheme, for digital standards with MPSK modulated preamble 有权
标题翻译：载波频偏估计方案，用于具有MPSK调制前导码的数字标准
公开(公告)号：US08611472B2
公开(公告)日：2013-12-17
申请号：US13447073
申请日：2012-04-13
申请人： Saurabh Mishra , Subrahmanya Kondageri Shankaraiah , Subramanian Harish Krishnan
发明人： Saurabh Mishra , Subrahmanya Kondageri Shankaraiah , Subramanian Harish Krishnan
IPC分类号： H03D3/22
CPC分类号： H04L27/0014 , H04L2027/003 , H04L2027/0051
摘要： A receiver for reducing acquisition time of a Carrier Frequency Offset (CFO) of an input intermediate frequency (IF) signal with M-PSK modulated preamble using spectral based analysis is provided. The receiver includes an analog to digital converter that converts the input IF signal into a digital signal, a down conversion unit that down converts the digital signal to a baseband complex signal, and a CFO estimation block that estimates the CFO. The CFO estimation block includes a carrier harmonic generation unit that generates an output of carrier Mth harmonic without modulation in the baseband complex signal, a spectral mapping unit that spectrally maps the carrier harmonic using complex Fast Fourier Transform, a spectral analysis unit that performs peak search on the spectrally mapped carrier Mth harmonic to obtain a peak position (PPOS), and a carrier frequency offset estimation unit that receives the peak position (PPOS) and estimates the CFO.
摘要翻译：提供了一种用于使用基于频谱的分析来减少具有M-PSK调制前同步码的输入中频（IF）信号的载波频率偏移（IFO）信号的采集时间的接收机。接收机包括将输入IF信号转换为数字信号的模数转换器，将数字信号下变频为基带复合信号的下变频单元以及估计CFO的CFO估计块。 CFO估计块包括在基带复信号中生成无调制的载波第M次谐波的输出的载波谐波产生单元，使用复数快速傅里叶变换频谱映射载波谐波的频谱映射单元，执行峰值搜索的频谱分析单元在频谱映射载波上的M次谐波获得峰值位置（PPOS），以及载波频率偏移估计单元，其接收峰值位置（PPOS）并估计CFO。

9. 发明申请

US20120269297A1 CARRIER FREQUENCY OFFSET ESTIMATION SCHEME, FOR DIGITAL STANDARDS WITH MPSK MODULATED PREAMBLE 有权
标题翻译：用于MPSK调制前缀的数字标准的载波频率偏移估计方案
公开(公告)号：US20120269297A1
公开(公告)日：2012-10-25
申请号：US13447073
申请日：2012-04-13
申请人： Saurabh Mishra , Subrahmanya Kondageri Shankaraiah , Subramanian Harish Krishnan
发明人： Saurabh Mishra , Subrahmanya Kondageri Shankaraiah , Subramanian Harish Krishnan
IPC分类号： H04L27/06
CPC分类号： H04L27/0014 , H04L2027/003 , H04L2027/0051
摘要： A receiver for reducing acquisition time of a Carrier Frequency Offset (CFO) of an input intermediate frequency (IF) signal with M-PSK modulated preamble using spectral based analysis is provided. The receiver includes an analog to digital converter that converts the input IF signal into a digital signal, a down conversion unit that down converts the digital signal to a baseband complex signal, and a CFO estimation block that estimates the CFO. The CFO estimation block includes a carrier harmonic generation unit that generates an output of carrier Mth harmonic without modulation in the baseband complex signal, a spectral mapping unit that spectrally maps the carrier harmonic using complex Fast Fourier Transform, a spectral analysis unit that performs peak search on the spectrally mapped carrier Mth harmonic to obtain a peak position (PPOS), and a carrier frequency offset estimation unit that receives the peak position (PPOS) and estimates the CFO.
摘要翻译：提供了一种用于使用基于频谱的分析来减少具有M-PSK调制前同步码的输入中频（IF）信号的载波频率偏移（IFO）信号的采集时间的接收机。接收机包括将输入IF信号转换为数字信号的模数转换器，将数字信号下变频为基带复合信号的下变频单元以及估计CFO的CFO估计块。 CFO估计块包括在基带复信号中生成无调制的载波第M次谐波的输出的载波谐波产生单元，使用复数快速傅里叶变换频谱映射载波谐波的频谱映射单元，执行峰值搜索的频谱分析单元在频谱映射载波上的M次谐波获得峰值位置（PPOS），以及载波频率偏移估计单元，其接收峰值位置（PPOS）并估计CFO。

10. 发明授权

US08670505B2 Early detection of segment type using BPSK and DBPSK modulated carriers in ISDB-T receivers 有权
标题翻译：在ISDB-T接收机中使用BPSK和DBPSK调制载波的段类型的早期检测
公开(公告)号：US08670505B2
公开(公告)日：2014-03-11
申请号：US13436162
申请日：2012-03-30
申请人： Subrahmanya Kondageri Shankaraiah , Abhijeet B Magadum
发明人： Subrahmanya Kondageri Shankaraiah , Abhijeet B Magadum
IPC分类号： H03D3/22
CPC分类号： H04L27/0008 , H04L27/2071 , H04L27/2656 , H04L27/2675
摘要： A receiver system for early detection of a segment type of an input signal based on BPSK and DBPSK modulated carriers is provided. The receiver system includes a tuner that converts the input signal into an intermediate frequency (IF) signal, a signal conditioning module that converts the IF signal into a baseband signal, a Frequency Domain Synchronization (FDS) block that detects the segment type of the input signal based on a carrier powers, a Transmission and Multiplexing Configuration Control (TMCC) decode block that performs a decoding operation on the received signal, a channel estimation block that estimates a channel and obtains a channel information. The TMCC decode block uses the channel information obtained from channel estimation block to correct a fast-frequency selective fading on the received signal before the decoding operation.
摘要翻译：提供了一种基于BPSK和DBPSK调制载波来早期检测输入信号段类型的接收机系统。接收机系统包括将输入信号转换为中频（IF）信号的调谐器，将IF信号转换为基带信号的信号调节模块，检测输入的分段类型的频域同步（FDS）基于载波功率的信号，对接收到的信号执行解码操作的传输和多路复用配置控制（TMCC）解码块，估计信道并获得信道信息的信道估计块。 TMCC解码块使用从信道估计块获得的信道信息来校正在解码操作之前的接收信号上的快速选择性衰落。

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