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公开(公告)号：US07349461B2
公开(公告)日：2008-03-25
申请号：US10366040
申请日：2003-02-13
CPC分类号： H04B1/712 , H04B1/7093
摘要： An efficient method and apparatus for implementing a back-end channel matched filter in a receiver is disclosed. A typical channel matched filter embodiment includes a peak detector for establishing processing synchronization from a despread signal, a channel estimator producing a channel impulse response (CIR) estimate from the despread signal based on the synchronization by the peak detector and a back-end symbol combiner coherently combining dominant multipath components of the despread signal by weights based on the CIR estimate based on the synchronization by the peak detector to generate a decision variable. In a digital spread spectrum implementation, the despread signal operated on by the channel matched filter has been previously been correlated with a spreading sequence replica.
摘要翻译： 公开了一种在接收机中实现后端信道匹配滤波器的有效方法和装置。 典型的信道匹配滤波器实施例包括用于根据解扩信号建立处理同步的峰值检测器，基于峰值检测器的同步的去扩展信号产生信道脉冲响应（CIR）估计的信道估计器和后端符号组合器 基于通过峰值检测器的同步的基于CIR估计的权重相加地组合去扩展信号的主要多径分量以产生决策变量。 在数字扩频实现中，由信道匹配滤波器操作的解扩信号先前已经与扩展序列副本相关联。
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公开(公告)号：US08009745B2
公开(公告)日：2011-08-30
申请号：US11386865
申请日：2006-03-22
IPC分类号： H04K1/10
CPC分类号： H04L27/2665 , H04L27/2678 , H04L27/2688 , H04L27/2695
摘要： Techniques for performing time tracking at a receiver are described. A first arriving path (FAP) and a last arriving path (LAP) are detected based on a channel impulse response estimate for a communication channel. The detected FAP and LAP may be correct or swapped. To resolve ambiguity in the detected FAP and LAP, a first hypothesis corresponding to the FAP and LAP being correctly detected and a second hypothesis corresponding to the FAP and LAP being incorrectly detected are evaluated. For each hypothesis, hypothesized FAP and LAP are determined based on the detected FAP and LAP, a correlation window is determined based on the hypothesized FAP and LAP, and correlation is performed using the correlation window. The correct hypothesis is determined based on correlation results for the two hypotheses. The receiver timing is updated based on the hypothesized FAP and LAP for the correct hypothesis and used for demodulation.
摘要翻译： 描述用于在接收机处执行时间跟踪的技术。 基于通信信道的信道脉冲响应估计来检测第一到达路径（FAP）和最后到达路径（LAP）。 检测到的FAP和LAP可能是正确的或交换的。 为了解决检测到的FAP和LAP中的歧义，评估了正确检测到对应于FAP和LAP的第一假设，以及对应于正确检测到的FAP和LAP的第二假说。 对于每个假设，基于检测到的FAP和LAP来确定假设的FAP和LAP，基于假设的FAP和LAP来确定相关窗口，并且使用相关窗口来执行相关性。 基于两个假设的相关结果确定正确的假设。 基于假设的FAP和LAP对于正确假设更新接收机定时并用于解调。
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公开(公告)号：US08130726B2
公开(公告)日：2012-03-06
申请号：US11313555
申请日：2005-12-20
申请人： Shimman Patel , Kuei-Chiang Lai , Seguei A. Glazko
发明人： Shimman Patel , Kuei-Chiang Lai , Seguei A. Glazko
IPC分类号： H04B7/216
CPC分类号： H04L27/2695 , H04L5/0048 , H04L25/022 , H04L25/0228 , H04L27/2613 , H04L27/2659 , H04L27/2662 , H04L27/3872 , H04L2027/0034 , H04L2027/0065
摘要： For frequency bin error estimation, multiple hypotheses are formed for different frequency bin errors, pilot offsets, or combinations of frequency bin error and pilot offset. For each hypothesis, received symbols are extracted from the proper subbands determined by the hypothesis. In one scheme, the extracted received symbols for each hypothesis are despread with a scrambling sequence to obtain despread symbols for that hypothesis. A metric is derived for each hypothesis based on the despread symbols, e.g., by deriving a channel impulse response estimate based on the despread symbols and then deriving the metric based on the channel impulse response estimate. In another scheme, the extracted received symbols for each hypothesis are correlated, and a metric is derived based on the correlation results. For both schemes, the frequency bin error and/or the pilot offset are determined based on the metrics for all hypotheses evaluated.
摘要翻译： 对于频率块误差估计，针对不同的频率误差，导频偏移或频率误差和导频偏移的组合形成多个假设。 对于每个假设，从由假设确定的适当子带中提取接收符号。 在一个方案中，每个假设的提取的接收符号用加扰序列解扩，以获得该假设的解扩符号。 基于解扩符号为每个假设导出度量，例如通过基于解扩符号导出信道脉冲响应估计，然后基于信道脉冲响应估计导出度量。 在另一方案中，将每个假设的提取的接收符号相关联，并且基于相关结果导出度量。 对于两种方案，基于所评估的所有假设的度量来确定频率块误差和/或导频偏移。
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4.发明授权公开(公告)号：US08009761B2
公开(公告)日：2011-08-30
申请号：US10877140
申请日：2004-06-24
申请人： Kuei-Chiang Lai , Helena D. O'Shea
发明人： Kuei-Chiang Lai , Helena D. O'Shea
CPC分类号： H04L27/0008 , H04L27/2017
摘要： A “unified” modulator for multiple modulation schemes (e.g., GMSK and 8PSK) is described. The waveform for each modulation scheme is generated based on a set of one or more pulse shaping functions. The waveforms for all supported modulation schemes may be generated based on a composite set of all the different pulse shaping functions. The unified modulator includes a filter for each pulse shaping function in the composite set. To generate the waveform for a selected modulation scheme, the set of one or more filters for this modulation scheme is enabled and all other filters are disabled. The outputs from all enabled filters are summed to generate a modulator output. When switching between modulation schemes, a smooth transition may be obtained by (1) providing a suitable data pattern for each filter to be enabled or disabled and (2) generating symbols for the new modulation scheme with an appropriate initial phase.
摘要翻译： 描述了用于多调制方案（例如，GMSK和8PSK）的“统一”调制器。 每个调制方案的波形是基于一组或多个脉冲整形功能产生的。 所有支持的调制方案的波形可以基于所有不同的脉冲整形功能的复合集合来生成。 统一调制器包括用于复合组中的每个脉冲整形功能的滤波器。 为了产生所选调制方案的波形，该调制方案的一个或多个滤波器组被启用，所有其他滤波器被禁用。 来自所有使能滤波器的输出相加以产生调制器输出。 当在调制方案之间切换时，可以通过（1）为每个要启用或禁用的滤波器提供合适的数据模式，以及（2）用适当的初始相位产生新的调制方案的符号来获得平滑的转换。
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公开(公告)号：US20060007994A1
公开(公告)日：2006-01-12
申请号：US10882477
申请日：2004-06-30
申请人： Kuei-Chiang Lai , Arunava Chaudhuri
发明人： Kuei-Chiang Lai , Arunava Chaudhuri
摘要： A received continuous phase modulation (CPM) signal (which is formed with a set of pulse shaping functions) is approximated as a phase shift keying (PSK) modulated signal (which is formed with just the dominant pulse shaping function having the largest energy). Channel estimation and data detection are performed in accordance with the CPM-to-PSK approximation. A signal power estimate and a noise power estimate are obtained for the received CPM signal and have errors due to the CPM-to-PSK approximation. The difference Δ between the energy of the dominant pulse shaping function and the energy of the remaining pulse shaping functions is determined. An approximation error is estimated based on the signal power estimate and the difference Δ. A C/I estimate for the received CPM signal is computed based on the signal power estimate, the noise power estimate, and the approximation error estimate.
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公开(公告)号：US20070110174A1
公开(公告)日：2007-05-17
申请号：US11386865
申请日：2006-03-22
申请人： Serguei Glazko , Kuei-Chiang Lai , Shimman Patel
发明人： Serguei Glazko , Kuei-Chiang Lai , Shimman Patel
IPC分类号： H04K1/10
CPC分类号： H04L27/2665 , H04L27/2678 , H04L27/2688 , H04L27/2695
摘要： Techniques for performing time tracking at a receiver are described. A first arriving path (FAP) and a last arriving path (LAP) are detected based on a channel impulse response estimate for a communication channel. The detected FAP and LAP may be correct or swapped. To resolve ambiguity in the detected FAP and LAP, a first hypothesis corresponding to the FAP and LAP being correctly detected and a second hypothesis corresponding to the FAP and LAP being incorrectly detected are evaluated. For each hypothesis, hypothesized FAP and LAP are determined based on the detected FAP and LAP, a correlation window is determined based on the hypothesized FAP and LAP, and correlation is performed using the correlation window. The correct hypothesis is determined based on correlation results for the two hypotheses. The receiver timing is updated based on the hypothesized FAP and LAP for the correct hypothesis and used for demodulation.
摘要翻译： 描述用于在接收机处执行时间跟踪的技术。 基于通信信道的信道脉冲响应估计来检测第一到达路径（FAP）和最后到达路径（LAP）。 检测到的FAP和LAP可能是正确的或交换的。 为了解决检测到的FAP和LAP中的歧义，评估了正确检测到对应于FAP和LAP的第一假设，以及对应于正确检测到的FAP和LAP的第二假说。 对于每个假设，基于检测到的FAP和LAP来确定假设的FAP和LAP，基于假设的FAP和LAP来确定相关窗口，并且使用相关窗口来执行相关性。 基于两个假设的相关结果确定正确的假设。 基于假设的FAP和LAP对于正确假设更新接收机定时并用于解调。
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7.发明申请公开(公告)号：US20050286653A1
公开(公告)日：2005-12-29
申请号：US10877140
申请日：2004-06-24
申请人： Kuei-Chiang Lai , Helena O'Shea
发明人： Kuei-Chiang Lai , Helena O'Shea
CPC分类号： H04L27/0008 , H04L27/2017
摘要： A “unified” modulator for multiple modulation schemes (e.g., GMSK and 8PSK) is described. The waveform for each modulation scheme is generated based on a set of one or more pulse shaping functions. The waveforms for all supported modulation schemes may be generated based on a composite set of all the different pulse shaping functions. The unified modulator includes a filter for each pulse shaping function in the composite set. To generate the waveform for a selected modulation scheme, the set of one or more filters for this modulation scheme is enabled and all other filters are disabled. The outputs from all enabled filters are summed to generate a modulator output. When switching between modulation schemes, a smooth transition may be obtained by (1) providing a suitable data pattern for each filter to be enabled or disabled and (2) generating symbols for the new modulation scheme with an appropriate initial phase.
摘要翻译： 描述了用于多调制方案（例如，GMSK和8PSK）的“统一”调制器。 每个调制方案的波形是基于一组或多个脉冲整形功能产生的。 所有支持的调制方案的波形可以基于所有不同的脉冲整形功能的复合集合来生成。 统一调制器包括用于复合组中的每个脉冲整形功能的滤波器。 为了产生所选调制方案的波形，该调制方案的一个或多个滤波器组被启用，所有其他滤波器被禁用。 来自所有使能滤波器的输出相加以产生调制器输出。 当在调制方案之间切换时，可以通过（1）为每个要启用或禁用的滤波器提供合适的数据模式，以及（2）用适当的初始相位产生新的调制方案的符号来获得平滑的转换。
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公开(公告)号：US20070140323A1
公开(公告)日：2007-06-21
申请号：US11313555
申请日：2005-12-20
申请人： Shimman Patel , Kuei-Chiang Lai , Seguei Glazko
发明人： Shimman Patel , Kuei-Chiang Lai , Seguei Glazko
IPC分类号： H04B1/00
CPC分类号： H04L27/2695 , H04L5/0048 , H04L25/022 , H04L25/0228 , H04L27/2613 , H04L27/2659 , H04L27/2662 , H04L27/3872 , H04L2027/0034 , H04L2027/0065
摘要： For frequency bin error estimation, multiple hypotheses are formed for different frequency bin errors, pilot offsets, or combinations of frequency bin error and pilot offset. For each hypothesis, received symbols are extracted from the proper subbands determined by the hypothesis. In one scheme, the extracted received symbols for each hypothesis are despread with a scrambling sequence to obtain despread symbols for that hypothesis. A metric is derived for each hypothesis based on the despread symbols, e.g., by deriving a channel impulse response estimate based on the despread symbols and then deriving the metric based on the channel impulse response estimate. In another scheme, the extracted received symbols for each hypothesis are correlated, and a metric is derived based on the correlation results. For both schemes, the frequency bin error and/or the pilot offset are determined based on the metrics for all hypotheses evaluated.
摘要翻译： 对于频率块误差估计，针对不同的频率误差，导频偏移或频率误差和导频偏移的组合形成多个假设。 对于每个假设，从由假设确定的适当子带中提取接收符号。 在一个方案中，每个假设的提取的接收符号用加扰序列解扩，以获得该假设的解扩符号。 基于解扩符号为每个假设导出度量，例如通过基于解扩符号导出信道脉冲响应估计，然后基于信道脉冲响应估计导出度量。 在另一方案中，将每个假设的提取的接收符号相关联，并且基于相关结果导出度量。 对于两种方案，基于所评估的所有假设的度量来确定频率块误差和/或导频偏移。
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公开(公告)号：US07145966B2
公开(公告)日：2006-12-05
申请号：US10882477
申请日：2004-06-30
申请人： Kuei-Chiang Lai , Arunava Chaudhuri
发明人： Kuei-Chiang Lai , Arunava Chaudhuri
摘要： A received continuous phase modulation (CPM) signal (which is formed with a set of pulse shaping functions) is approximated as a phase shift keying (PSK) modulated signal (which is formed with just the dominant pulse shaping function having the largest energy). Channel estimation and data detection are performed in accordance with the CPM-to-PSK approximation. A signal power estimate and a noise power estimate are obtained for the received CPM signal and have errors due to the CPM-to-PSK approximation. The difference Δ between the energy of the dominant pulse shaping function and the energy of the remaining pulse shaping functions is determined. An approximation error is estimated based on the signal power estimate and the difference Δ. A C/I estimate for the received CPM signal is computed based on the signal power estimate, the noise power estimate, and the approximation error estimate.
摘要翻译： 接收的连续相位调制（CPM）信号（其形成有一组脉冲整形功能）被近似为相移键控（PSK）调制信号（其仅具有最大能量的主要脉冲整形功能）。 根据CPM-to-PSK近似执行信道估计和数据检测。 对于接收的CPM信号获得信号功率估计和噪声功率估计，并且由于CPM-to-PSK近似而具有误差。 确定主要脉冲整形功能的能量与剩余脉冲整形功能的能量之间的差值Delta。 基于信号功率估计和差值Delta来估计近似误差。 基于信号功率估计，噪声功率估计和近似误差估计来计算接收的CPM信号的C / I估计。
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