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公开(公告)号：US5768323A
公开(公告)日：1998-06-16
申请号：US322854
申请日：1994-10-13
IPC分类号： H03L7/099 , H04L7/00 , H04L7/02 , H04L27/227
CPC分类号： H04L27/2273 , H03L7/0994 , H04L7/0029 , H04L7/0083
摘要： A method and apparatus for synchronizing symbol timing for a QPSK demodulator. A matched filter pair outputs respective "early-punctual-late" signals. The early and late signals are input to a symbol synchronizing estimator that produces an interpolation control signal used by the filters to synchronize the symbol timing to the sample timing. The punctual signal is output as an information bearing signal representing the received inphase and quadrature signals. The matched filters are interpolating matched filters. The symbol synchronizing estimator normalizes the early and late signals in a manner that allow the demodulator to "flywheel" over signals having a low signal to noise ratio below a predetermined threshold.
摘要翻译： 一种用于使QPSK解调器的符号定时同步的方法和装置。 匹配滤波器对输出相应的“早点延迟”信号。 早期和晚期信号被输入到符号同步估计器，该估计器产生滤波器使用的插值控制信号，以使符号定时与采样定时同步。 作为表示接收的同相和正交信号的信息承载信号输出准时信号。 匹配滤波器内插匹配滤波器。 符号同步估计器以使得解调器能够以低于预定阈值的低信噪比的信号“飞轮”的方式对早期和晚期信号进行归一化。
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公开(公告)号：US5579345A
公开(公告)日：1996-11-26
申请号：US322847
申请日：1994-10-13
IPC分类号： H04L27/00 , H04L27/233 , H04L27/06 , H03D3/22
CPC分类号： H04L27/2332 , H04L2027/003 , H04L2027/0048
摘要： A carrier tracking loop that uses a frequency locked loop (FLL) and incorporates synchronized matched filters to minimize complexity of the system. The synchronized matched filters eliminate out-of-band interference while minimizing computation. The carrier tracking loop has an improved error signal generation to extend a frequency range and by employing error signal normalization, which extends the dynamic range of the amplitude of the input signal and allows the frequency to flywheel when signal fading occurs.
摘要翻译： 使用频率锁定环路（FLL）的载波跟踪环路，并集成了同步的匹配滤波器，以最大程度降低系统的复杂度。 同步匹配滤波器消除带外干扰，同时最小化计算。 载波跟踪环路具有改进的误差信号产生，以扩展频率范围并通过采用误差信号归一化，其延长了输入信号幅度的动态范围，并允许频率在发生信号衰落时飞行。
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公开(公告)号：US5598441A
公开(公告)日：1997-01-28
申请号：US322840
申请日：1994-10-13
IPC分类号： H04L27/00 , H04L27/233 , H03D1/00
CPC分类号： H04L27/2332 , H04L2027/003 , H04L2027/0057
摘要： A method and apparatus for estimating a frequency of a received carrier wave in a Quadrature Phase Shift Keying (QPSK) system. The invention uses a combination of an FFT, DFT bins, and three point interpolation to estimate a frequency of the carrier wave. The system is robust and compensates for multipath fading and other types of signal degradation.
摘要翻译： 一种用于估计正交相移键控（QPSK）系统中的接收载波频率的方法和装置。 本发明使用FFT，DFT仓和三点内插的组合来估计载波的频率。 该系统是稳健的，并补偿多路径衰落和其他类型的信号衰减。
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4.发明授权Locally coherent QPSK detection with differential decoding for a fading channel 失效用于衰落信道的差分解码的本地相干QPSK检测
公开(公告)号：US5684835A
公开(公告)日：1997-11-04
申请号：US322846
申请日：1994-10-13
IPC分类号： H04L27/00 , H04L27/233 , H03D3/22 , H04L27/22
CPC分类号： H04L27/2332 , H04L2027/003 , H04L2027/0048
摘要： A locally coherent Quadrature Phase Shift Keying (QPSK) detector that uses a normalized fourth power weighting technique to generate an ambiguous local phase reference of a current symbol. A phase adjusted previous symbol reference is used to resolve the ambiguity using differentially coded data and yield current soft symbol information.
摘要翻译： 本地相干正交相移键控（QPSK）检测器，其使用归一化的第四功率加权技术来产生当前符号的模糊的局部相位参考。 使用相位调整的先前符号参考来使用差分编码数据解析模糊度并且产生当前软符号信息。
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5.发明授权Coherent track for FM IBOC receiver using a switch diversity antenna system 有权使用开关分集天线系统的FM IBOC接收机的相干轨道公开(公告)号：US07724850B2
公开(公告)日：2010-05-25
申请号：US10874681
申请日：2004-06-23
IPC分类号： H04B7/10
CPC分类号： H04B7/0805 , H04L25/0232 , H04L27/261 , H04L27/2647
摘要： A method is provided for coherently tracking a radio signal including a plurality of digitally modulated reference subcarriers. The method comprises the steps of receiving symbols transmitted on the reference subcarriers, combining the reference subcarrier symbols with a known reference sequence conjugate to produce a plurality of samples, median filtering the samples to produce filtered samples, and smoothing the samples for each of the reference subcarriers over the plurality of reference subcarriers to produce a coherent reference signal estimate for each of the subcarriers. A receiver for coherently tracking a radio signal including at least one digitally modulated reference carrier is also provided.
摘要翻译： 提供了一种用于相干跟踪包括多个数字调制参考子载波的无线电信号的方法。 该方法包括以下步骤：接收在参考子载波上发送的符号，将参考子载波符号与已知参考序列共轭相结合以产生多个样本，对样本进行中值滤波以产生滤波样本，以及平滑每个参考的样本 多个参考子载波上的子载波，以产生每个子载波的相干参考信号估计。 还提供了一种用于相干跟踪包括至少一个数字调制参考载波的无线电信号的接收机。
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6.发明授权Numerically controlled oscillator with complex exponential outputs using recursion technique 失效使用递归技术的具有复指数输出的数控振荡器
公开(公告)号：US5517535A
公开(公告)日：1996-05-14
申请号：US322845
申请日：1994-10-13
申请人： Brian W. Kroeger , Jeffrey S. Baird
发明人： Brian W. Kroeger , Jeffrey S. Baird
CPC分类号： G06F1/022 , G06F2101/04
摘要： A numerically controlled oscillator that outputs a complex exponential value (sine and cosine). The numerically controlled oscillator inputs a scalar phase increment and uses the scalar phase increment to approximate a complex exponential phasor increment. A complex multiplier multiplies the exponential increment by an exponential value previously output from the oscillator to yield a multiplication result. A recursive amplitude normalizer, connected to the complex multiplier, normalizes the multiplication result to yield the complex exponential value.
摘要翻译： 输出复数指数值（正弦和余弦）的数控振荡器。 数字振荡器输入标量相位增量，并使用标量相位增量近似复指数相量增量。 复数乘法器将指数增量乘以先前从振荡器输出的指数值，以产生乘法结果。 连接到复数乘法器的递归幅度归一化器对乘法结果进行归一化以产生复指数值。
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公开(公告)号：US08831546B2
公开(公告)日：2014-09-09
申请号：US13536203
申请日：2012-06-28
IPC分类号： H04B1/18
CPC分类号： H04B7/0857 , H04B7/0845 , H04B7/0885 , H04H2201/18
摘要： A radio receiver includes a first signal path including a first tuner configured to receive a first signal from a first antenna, and a first demodulator configured to demodulate symbols from an output of the first tuner to produce first branch metrics derived from the demodulated symbols; a second signal path including a second tuner configured to receive a second signal from a second antenna, and a second demodulator configured to demodulate symbols from an output of the second tuner to produce second branch metrics derived from the demodulated symbols; a combiner for maximum ratio combining the first branch metrics and the second branch metrics; and processing circuitry to process the combined first and second branch metrics to produce an output signal.
摘要翻译： 无线电接收机包括：第一信号路径，包括被配置为从第一天线接收第一信号的第一调谐器;以及第一解调器，被配置为从第一调谐器的输出解调符号，以产生从解调符号导出的第一分支度量; 第二信号路径，包括被配置为从第二天线接收第二信号的第二调谐器，以及第二解调器，被配置为从所述第二调谐器的输出解调符号，以产生从解调符号导出的第二分支度量; 组合第一分支度量和第二分支度量的最大比率的组合器; 以及处理电路，用于处理组合的第一和第二分支度量以产生输出信号。
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8.发明授权Carrier tracking technique and apparatus having automatic flywheel/tracking/reacquisition control and extended signal to noise ratio 失效具有自动飞轮/跟踪/重新获取控制和扩展信噪比的载波跟踪技术和装置
公开(公告)号：US5828705A
公开(公告)日：1998-10-27
申请号：US593154
申请日：1996-02-01
申请人： Brian W. Kroeger , Jeffrey S. Baird
发明人： Brian W. Kroeger , Jeffrey S. Baird
IPC分类号： H04L27/00 , H04L27/233 , H04L27/14 , H04L27/16 , H04L27/22
CPC分类号： H04L27/2332 , H04L2027/003 , H04L2027/0057 , H04L2027/0067 , H04L2027/0073
摘要： The carrier tracking loop technique and apparatus provides smooth, accurate frequency tracking, fast reacquisition and doppler tracking over a wide dynamic range. The loop parameters of the carrier tracking loop are varied as a function of mode, i.e. flywheel, tracking or reacquisition modes. The various modes of operation are automatically detected and loop operation is enhanced by non-linear techniques. The enhancements include fourth power sample normalization to improve performance over a large dynamic range and to ease fixed point scaling. A slope limiter is included which aids in coherent detection by reducing phase noise introduced by the carrier tracking loop. Also, a predifferentiation filter further aids in coherent detection by reducing phase noise.
摘要翻译： 载波跟踪环路技术和装置在宽动态范围内提供平稳，准确的频率跟踪，快速重新采集和多普勒跟踪。 作为模式的函数，即飞轮，跟踪或重新获取模式，载波跟踪环路的循环参数是变化的。 自动检测各种操作模式，通过非线性技术增强循环操作。 增强功能包括第四次功率样本归一化，以提高在大动态范围内的性能，并简化固定点缩放。 包括一个斜率限制器，通过减少由载波跟踪环路引入的相位噪声来帮助进行相干检测。 此外，预分化滤波器还通过减少相位噪声来辅助相干检测。
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9.发明授权Automatic noise normalization and reacquisition control for a QPSK demodulator symbol tracking loop 失效QPSK解调器符号跟踪循环的自动噪声归一化和重新获取控制
公开(公告)号：US5566214A
公开(公告)日：1996-10-15
申请号：US491667
申请日：1995-06-19
申请人： Brian W. Kroeger , Jeffrey S. Baird
发明人： Brian W. Kroeger , Jeffrey S. Baird
CPC分类号： H04L27/22
摘要： A QPSK demodulator symbol tracking loop including automatic noise normalization and reacquisition control enables improved symbol tracking and acquisition during fading or intermittent channel conditions. A noise variance estimate is determined and the symbol tracking loop flywheels when the signal level dips below a flywheel threshold relative to the noise variance estimate during fading or intermittent channel conditions. Determination in advance of an absolute power level of the thermal noise floor of analog front end components is dispensed with and precise control of the gain and noise level of the analog front end components is not needed, thus simplifying design. A reacquisition mode is declared upon determination of an abrupt increase in signal level indicative of emergence from a fading condition or upon detection of an excessive symbol tracking error signal. During the reacquisition mode, the loop gain of the symbol tracking loop is temporarily increased to improve reacquisition time.
摘要翻译： 包括自动噪声归一化和重新获取控制的QPSK解调器符号跟踪环能够在衰落或间歇信道条件下改进符号跟踪和采集。 确定噪声方差估计，并且当信号电平在衰落或间歇信道条件期间相对于噪声方差估计下降到飞轮阈值以下时，符号跟踪环路飞行。 模拟前端部件的热噪声基底的绝对功率水平之前的确定被省略，并且不需要对模拟前端部件的增益和噪声电平的精确控制，从而简化了设计。 在确定指示从衰落状态出现或者在检测到过多的符号跟踪误差信号的信号电平突然增加时，声明重新获取模式。 在重新获取模式期间，暂时增加符号跟踪循环的环路增益，以提高重新获取时间。
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公开(公告)号：US20130115903A1
公开(公告)日：2013-05-09
申请号：US13536203
申请日：2012-06-28
IPC分类号： H04B1/18
CPC分类号： H04B7/0857 , H04B7/0845 , H04B7/0885 , H04H2201/18
摘要： A radio receiver includes a first signal path including a first tuner configured to receive a first signal from a first antenna, and a first demodulator configured to demodulate symbols from an output of the first tuner to produce first branch metrics derived from the demodulated symbols; a second signal path including a second tuner configured to receive a second signal from a second antenna, and a second demodulator configured to demodulate symbols from an output of the second tuner to produce second branch metrics derived from the demodulated symbols; a combiner for maximum ratio combining the first branch metrics and the second branch metrics; and processing circuitry to process the combined first and second branch metrics to produce an output signal.
摘要翻译： 无线电接收机包括：第一信号路径，包括被配置为从第一天线接收第一信号的第一调谐器;以及第一解调器，被配置为从第一调谐器的输出解调符号，以产生从解调符号导出的第一分支度量; 第二信号路径，包括被配置为从第二天线接收第二信号的第二调谐器，以及第二解调器，被配置为从所述第二调谐器的输出解调符号，以产生从解调符号导出的第二分支度量; 组合第一分支度量和第二分支度量的最大比率的组合器; 以及处理电路，用于处理组合的第一和第二分支度量以产生输出信号。
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