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公开(公告)号：US5568142A
公开(公告)日：1996-10-22
申请号：US326474
申请日：1994-10-20
CPC分类号： H03M1/121 , H03H17/0266
摘要： A hybrid filter bank analog-to-digital converter includes continuous-time analysis filters and discrete-time synthesis filters. The continuous-time analysis filters partition a continuous-time wideband input signal into continuous-time subband signals. An analog-to-digital converter bank quantizes the subband signals at a low data rate. A bank of upsamplers increases the data rate of the quantized subband signals. A bank of discrete-time synthesis filters processes the upsampled subband signals, generating signals which are the discrete-time approximation of the continuous-time subband signals. The subband signals may be recombined into a discrete-time wideband signal which is the discrete-time approximation of the continuous-time wideband input signal. The linearity errors, analog-to-digital converter mismatches and quantization noise are not compounded between the frequency bands, thereby increasing resolution. The system may also include compensators for compensating for non-linear behavior in the analog-to-digital converters and may include application-specific processors for further processing of the compensated subband signals. An alternative embodiment employs discrete-time analysis filters and continuous-time synthesis filters for digital-to-analog conversion.
摘要翻译： 混合滤波器组模数转换器包括连续时间分析滤波器和离散时间合成滤波器。 连续时间分析滤波器将连续时间宽带输入信号划分为连续时间子带信号。 模数转换器组以低数据速率量化子带信号。 一组上采样器增加量化子带信号的数据速率。 离散时间合成滤波器组处理上采样的子带信号，产生作为连续时间子带信号的离散时间近似的信号。 子带信号可以被重新组合成离散时间宽带信号，其是连续时间宽带输入信号的离散时间近似。 线性误差，模数转换器不匹配和量化噪声不会在频带之间复合，从而提高分辨率。 该系统还可以包括用于补偿模数转换器中的非线性行为的补偿器，并且可以包括用于进一步处理补偿的子带信号的应用专用处理器。 替代实施例采用离散时间分析滤波器和用于数模转换的连续时间合成滤波器。
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公开(公告)号：US06593880B2
公开(公告)日：2003-07-15
申请号：US09188835
申请日：1998-11-09
IPC分类号： H04B700
摘要： A wireless communication system employs directive antenna arrays and knowledge of position of users to form narrow antenna beams to and from desired users and away from undesired users to reduce co-channel interference. By reducing co-channel interference coming from different directions, spatial filtering with antenna arrays improves the call capacity of the system. A space division multiple access (SDMA) system allocates a narrow antenna beam pattern to each user in the system so that each user has its own communication channel free from co-channel interference. The position of the users is determined using geo-location techniques. Geo-location can be derived via triangulation between cellular base stations or via a global positioning system (GPS) receiver. The system can be optimized by applying partially adaptive processing algorithms, which are seeded by geo-location data.
摘要翻译： 无线通信系统使用指令性天线阵列和用户位置知识来形成到所需用户和来自期望用户的远离不期望的用户的窄天线波束，以减少同频道干扰。 通过减少来自不同方向的同信道干扰，利用天线阵列的空间滤波改善了系统的呼叫容量。 空分多址（SDMA）系统为系统中的每个用户分配窄天线波束模式，使得每个用户具有其自身的通信信道不受同频道干扰。 使用地理位置技术确定用户的位置。 地理位置可以通过蜂窝基站之间的三角测量或通过全球定位系统（GPS）接收机得出。 可以通过应用部分自适应处理算法来优化系统，这些算法由地理位置数据种子化。
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公开(公告)号：US06512481B1
公开(公告)日：2003-01-28
申请号：US08729289
申请日：1996-10-10
IPC分类号： H04B700
摘要： A wireless communication system employs directive antenna arrays and knowledge of position of users to form narrow antenna beams to and from desired users and away from undesired users to reduce co-channel interference. By reducing co-channel interference coming from different directions, spatial filtering with antenna arrays improves the call capacity of the system. A space division multiple access (SDMA) system allocates a narrow antenna beam pattern to each user in the system so that each user has its own communication channel free from co-channel interference. The position of the users is determined using geo-location techniques. Geo-location can be derived via triangulation between cellular base stations or via a global positioning system (GPS) receiver.
摘要翻译： 无线通信系统使用指令性天线阵列和用户位置知识来形成到所需用户和来自期望用户的远离不期望的用户的窄天线波束，以减少同频道干扰。 通过减少来自不同方向的同信道干扰，利用天线阵列的空间滤波改善了系统的呼叫容量。 空分多址（SDMA）系统为系统中的每个用户分配窄天线波束模式，使得每个用户具有其自身的通信信道不受同频道干扰。 使用地理位置技术确定用户的位置。 地理位置可以通过蜂窝基站之间的三角测量或通过全球定位系统（GPS）接收机得出。
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公开(公告)号：US20110095819A1
公开(公告)日：2011-04-28
申请号：US12817075
申请日：2010-06-16
申请人： Scott R. Velazquez
发明人： Scott R. Velazquez
CPC分类号： H03F1/3247 , H03F1/3258 , H03F3/19
摘要： The present invention provides an advanced adaptive predistortion linearization technique to dramatically reduce nonlinear distortion in power amplifiers over a very wide instantaneous bandwidth (up to 2 GHz) and over a wide range of amplifier types, input frequencies, signal types, amplitudes, temperature, and other environmental and signal conditions. In an embodiment of the invention, the predistortion linearization circuitry comprises (1) a higher-order polynomial model of an amplifier's gain and phase characteristics—higher than a third-order polynomial model; (2) an adaptive calibration technique; and (3) a heuristic calibration technique. The higher-order polynomial model is generated by introducing, for example, a plurality of multi-tone test signals with varying center frequency and spacing into the power amplifier. From the power amplifier's corresponding output, the nonlinearities are modeled by employing a higher-order curve fit to capture the irregularities in the nonlinear transfer function. Different distortion transfer functions can be implemented for different operating conditions. The adaptive calibration technique is based on a feedback analysis technique, which updates the applicable distortion transfer function by analyzing the error signal between the introduced input signal and the output signal in real-time. The heuristic calibration technique implements different distortion transfer functions based on historical operating conditions and optimal configurations of the power amplifier.
摘要翻译： 本发明提供了一种先进的自适应预失真线性化技术，用于在非常宽的瞬时带宽（高达2GHz）以及宽范围的放大器类型，输入频率，信号类型，振幅，温度和 其他环境和信号条件。 在本发明的实施例中，预失真线性化电路包括（1）放大器的增益和相位特性的高阶多项式模型 - 高于三阶多项式模型; （2）自适应校准技术; 和（3）启发式校准技术。 通过将具有变化的中心频率和间隔的多个多音调测试信号引入功率放大器来生成高阶多项式模型。 从功率放大器的相应输出，通过采用更高阶的曲线拟合来捕获非线性传递函数中的不规则性来建模非线性。 不同的工作条件可以实现不同的失真传递功能。 自适应校准技术基于反馈分析技术，其通过分析引入的输入信号和输出信号之间的误差信号来实时更新适用的失真传递函数。 启发式校准技术基于历史操作条件和功率放大器的最佳配置实现不同的失真传递函数。
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公开(公告)号：US06177893B1
公开(公告)日：2001-01-23
申请号：US09153802
申请日：1998-09-15
IPC分类号： H03M106
CPC分类号： H03M1/121
摘要： In one aspect, the present invention is directed to a converter for converting a signal from a first format to a second format. The converter includes a decomposition section, a converter array operatively coupled to the decomposition section, and a recombination section operatively coupled to the converter array. The decomposition section includes an input to receive the input signal, a splitter to divide the input signal into a plurality of signals, a plurality of signal outputs, each of which provides as an output one of the plurality of signals, and a clock circuit having a plurality of clock outputs for providing sample clocks to the converter array. The converter array includes a plurality of converters each having a signal input to receive one of the plurality of signals, each having a clock input to receive one of the sample clocks and each having an output that provides a converted signal. At least one of the decomposition section and the recombination section includes filters for filtering one of the plurality of signals and the plurality of converted signals. Other aspects of the invention are directed to methods for generating and calibrating analog and digital converters.
摘要翻译： 一方面，本发明涉及一种用于将来自第一格式的信号转换为第二格式的转换器。 转换器包括分解部分，可操作地耦合到分解部分的转换器阵列，以及可操作地耦合到转换器阵列的复合部分。 分解部分包括用于接收输入信号的输入端，将输入信号划分为多个信号的分路器，多个信号输出，每个信号输出提供多个信号中的一个输出信号;以及时钟电路， 多个时钟输出，用于向转换器阵列提供采样时钟。 转换器阵列包括多个转换器，每个转换器具有输入信号以接收多个信号中的一个信号，每个信号具有时钟输入以接收采样时钟之一，并且每个具有提供转换信号的输出。 分解部分和复合部分中的至少一个包括用于对多个信号中的一个信号和多个转换信号进行滤波的滤波器。 本发明的其它方面涉及用于产生和校准模拟和数字转换器的方法。
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公开(公告)号：US20150032788A1
公开(公告)日：2015-01-29
申请号：US13915484
申请日：2013-06-11
IPC分类号： H03H21/00
CPC分类号： H03H21/0067 , H03H21/0043 , H03M1/1052 , H04B1/001 , H04L25/02 , H04L25/14 , H04L27/0006 , H04L27/0012 , H04L27/265
摘要： The present invention is an improved linearizer that implements more complex transfer functions to provide the necessary linearization performance with a reasonable amount of signal processing resources. Particularly, the linearizer operates on an analog-to-digital converter and comprises a distortion compensator and one or more factored Volterra compensators, which may include a second-order factored Volterra compensator, a third-order factored Volterra compensator, and additional higher-order factored Volterra compensators. Inclusion of factored Volterra distortion compensators improves linearization processing performance while significantly reducing the computational complexity compared to a traditional Volterra-based compensator.
摘要翻译： 本发明是一种改进的线性化器，其实现更复杂的传递函数，以提供具有合理数量的信号处理资源的必要的线性化性能。 特别地，线性化器在模数转换器上操作，并且包括失真补偿器和一个或多个因子Volterra补偿器，其可以包括二阶因子Volterra补偿器，三阶因子Volterra补偿器和附加高阶 沃尔特拉补偿器。 与传统的基于沃尔泰拉的补偿器相比，包含因子Volterra失真补偿器提高了线性化处理性能，同时显着降低了计算复杂度。
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公开(公告)号：US08085175B2
公开(公告)日：2011-12-27
申请号：US13079293
申请日：2011-04-04
申请人： Scott R. Velazquez
发明人： Scott R. Velazquez
IPC分类号： H03M1/06
CPC分类号： H03F1/3247 , H03F1/3258 , H03F3/19
摘要： The present invention provides an advanced adaptive predistortion linearization technique to dramatically reduce nonlinear distortion in power amplifiers over a very wide instantaneous bandwidth (up to 2 GHz) and over a wide range of amplifier types, input frequencies, signal types, amplitudes, temperature, and other environmental and signal conditions. In an embodiment of the invention, the predistortion linearization circuitry comprises (1) a higher-order polynomial model of an amplifier's gain and phase characteristics—higher than a third-order polynomial model; (2) an adaptive calibration technique; and (3) a heuristic calibration technique. The higher-order polynomial model is generated by introducing, for example, a plurality of multi-tone test signals with varying center frequency and spacing into the power amplifier. From the power amplifier's corresponding output, the nonlinearities are modeled by employing a higher-order curve fit to capture the irregularities in the nonlinear transfer function. Different distortion transfer functions can be implemented for different operating conditions. The adaptive calibration technique is based on a feedback analysis technique, which updates the applicable distortion transfer function by analyzing the error signal between the introduced input signal and the output signal in real-time. The heuristic calibration technique implements different distortion transfer functions based on historical operating conditions and optimal configurations of the power amplifier.
摘要翻译： 本发明提供了一种先进的自适应预失真线性化技术，用于在非常宽的瞬时带宽（高达2GHz）以及宽范围的放大器类型，输入频率，信号类型，振幅，温度和 其他环境和信号条件。 在本发明的实施例中，预失真线性化电路包括（1）放大器的增益和相位特性的高阶多项式模型 - 高于三阶多项式模型; （2）自适应校准技术; 和（3）启发式校准技术。 通过将具有变化的中心频率和间隔的多个多音调测试信号引入功率放大器来生成高阶多项式模型。 从功率放大器的相应输出，通过采用更高阶的曲线拟合来捕获非线性传递函数中的不规则性来建模非线性。 不同的工作条件可以实现不同的失真传递函数。 自适应校准技术基于反馈分析技术，其通过分析引入的输入信号和输出信号之间的误差信号来实时更新适用的失真传递函数。 启发式校准技术基于历史操作条件和功率放大器的最佳配置实现不同的失真传递函数。
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公开(公告)号：US07782235B1
公开(公告)日：2010-08-24
申请号：US12112380
申请日：2008-04-30
申请人： Scott R. Velazquez
发明人： Scott R. Velazquez
IPC分类号： H03M1/06
CPC分类号： H03M1/1052 , H03M1/1004 , H03M1/1215 , H03M1/164
摘要： In a compensator for compensating mismatches, and in methods for such compensation, the compensator compensates for mismatches in output signals of a system with mismatches during normal operation of the system with mismatches. The compensator comprises: a mismatch estimator that monitors at least two mismatched signals output by the system with mismatches during normal operation and that generates matching parameters indicating an amount of mismatch between the at least two mismatched signals, the mismatch estimator updating the matching parameters during normal operation of the system with mismatches, and a mismatch equalizer that compensates mismatches in the mismatched signals output by the system with mismatches during normal operation of the system with mismatches in response to the matching parameters.
摘要翻译： 在用于补偿不匹配的补偿器中，以及用于补偿的方法中，补偿器补偿系统正常运行期间不匹配时系统输出信号不匹配的错配。 补偿器包括：不匹配估计器，其在正常操作期间监视由系统输出的至少两个不匹配信号，并且产生指示至少两个失配信号之间的失配量的匹配参数，不匹配估计器在正常期间更新匹配参数 不匹配的系统的操作，以及不匹配均衡器，其补偿系统在由于匹配参数的不正确的正常操作期间输出的不匹配的错误信号中的不匹配。
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公开(公告)号：US06388594B1
公开(公告)日：2002-05-14
申请号：US09680057
申请日：2000-10-04
IPC分类号： H03M110
CPC分类号： H03M1/121
摘要： In one aspect, the present invention is directed to a converter for converting a signal from a first format to a second format. The converter includes a decomposition section, a converter array operatively coupled to the decomposition section, and a recombination section operatively coupled to the converter array. The decomposition section includes an input to receive the input signal, a splitter to divide the input signal into a plurality of signals, a plurality of signal outputs, each of which provides as an output one of the plurality of signals, and a clock circuit having a plurality of clock outputs for providing sample clocks to the converter array. The converter array includes a plurality of converters each having a signal input to receive one of the plurality of signals, each having a clock input to receive one of the sample clocks and each having an output that provides a converted signal. At least one of the decomposition section and the recombination section includes filters for filtering one of the plurality of signals and the plurality of converted signals. Other aspects of the invention are directed to methods for generating and calibrating analog and digital converters.
摘要翻译： 一方面，本发明涉及一种用于将来自第一格式的信号转换为第二格式的转换器。 转换器包括分解部分，可操作地耦合到分解部分的转换器阵列，以及可操作地耦合到转换器阵列的复合部分。 分解部分包括用于接收输入信号的输入端，将输入信号划分为多个信号的分路器，多个信号输出，每个信号输出提供多个信号中的一个输出信号;以及时钟电路， 多个时钟输出，用于向转换器阵列提供采样时钟。 转换器阵列包括多个转换器，每个转换器具有输入信号以接收多个信号中的一个信号，每个信号具有时钟输入以接收采样时钟之一，并且每个具有提供转换信号的输出。 分解部分和复合部分中的至少一个包括用于对多个信号中的一个信号和多个转换信号进行滤波的滤波器。 本发明的其它方面涉及用于产生和校准模拟和数字转换器的方法。
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公开(公告)号：US06198416B1
公开(公告)日：2001-03-06
申请号：US09548069
申请日：2000-04-12
申请人： Scott R. Velazquez
发明人： Scott R. Velazquez
IPC分类号： H03M106
CPC分类号： H03M1/0614 , H03M1/12
摘要： In one aspect, the present invention is directed to a compensator for compensating linearity errors, such as harmonic distortion and intermodulation distortion, in devices. The compensator includes a means for phase-shifting and a means for exponentiation to generate a compensation signal such that the linearity error distortion signals are canceled in the system output while maintaining the desired fundamental signal. Another aspect of the invention is directed to methods for calibrating the linearity error compensator. Another aspect of the invention is directed to a modeling linearity errors in a device.
摘要翻译： 一方面，本发明涉及用于补偿装置中的线性误差（诸如谐波失真和互调失真）的补偿器。 补偿器包括用于相移的装置和用于求幂的装置以产生补偿信号，使得线性误差失真信号在系统输出中被消除，同时保持期望的基本信号。 本发明的另一方面涉及校准线性误差补偿器的方法。 本发明的另一方面涉及一种设备中的建模线性误差。
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