公开(公告)号：US20150091777A1

公开(公告)日：2015-04-02

申请号：US14239813

申请日：2013-04-17

申请人： John S. Rucki ,  Charles J. Buondelmonte ,  Julian R. Colapietro ,  Rajiv Chandrasekaran

发明人： John S. Rucki ,  Charles J. Buondelmonte ,  Julian R. Colapietro ,  Rajiv Chandrasekaran

IPC分类号： H01Q1/42

CPC分类号： H01Q1/42 ,  H01Q1/246

摘要： In one embodiment, an antenna assembly in a cellular network has a radome that houses a plurality of antenna arrays and an electronics module. The electronics module has a weatherproof housing that encloses electronics for processing signals received by and transmitted from a first of the antenna arrays. The electronics module is physically removeably connected to an outer surface of the radome and electrically removeably connected to the first antenna array, such that the electronics module can be removed without (i) disrupting service to other antenna arrays and (ii) removing the antenna assembly from the cell tower on which the antenna assembly is installed.

摘要翻译： 在一个实施例中，蜂窝网络中的天线组件具有容纳多个天线阵列和电子模块的天线罩。 电子模块具有防水外壳，其包围用于处理由第一天线阵列接收和发送的信号的电子装置。 电子模块物理地可拆卸地连接到天线罩的外表面并且电可移除地连接到第一天线阵列，使得可以移除电子模块而不（i）中断对其他天线阵列的服务，以及（ii）去除天线组件 从安装天线组件的电池塔。

公开(公告)号：US20120286865A1

公开(公告)日：2012-11-15

申请号：US13398088

申请日：2012-02-16

申请人： Rajiv Chandrasekaran

发明人： Rajiv Chandrasekaran

IPC分类号： H03F1/26

CPC分类号： H03F3/24 ,  H03F1/3247 ,  H03F1/3294 ,  H03F3/195 ,  H03F2200/336 ,  H03F2200/451 ,  H03F2201/3212 ,  H03F2201/3233 ,  H04L27/368

摘要： An input signal is pre-distorted to reduce distortion resulting from subsequent signal amplification. Frequency-dependent pre-distortion is preferably implemented in combination with frequency-independent pre-distortion, where the frequency-dependent pre-distortion is generated by expanding the derivative of a product of a pre-distortion function and the input signal and then relaxing constraints on the pre-distortion function and/or on frequency-dependent filtering associated with the frequency-dependent pre-distortion. In one implementation, four different frequency-dependent pre-distortion signals are generated for the expansion using up to four different pre-distortion functions and up to four different frequency-dependent filters.

摘要翻译： 输入信号是预失真的，以减少后续信号放大产生的失真。 频率相关的预失真优选地与频率无关的预失真结合实现，其中通过扩展预失真函数和输入信号的乘积的导数然后放宽约束来产生与频率相关的预失真 关于预失真功能和/或与频率相关的预失真相关联的频率依赖滤波。 在一个实施方案中，使用最多四个不同的预失真功能和多达四个不同的频率相关滤波器来生成用于扩展的四个不同的频率相关的预失真信号。

公开(公告)号：US06765440B2

公开(公告)日：2004-07-20

申请号：US10322953

申请日：2002-12-18

申请人： Rajiv Chandrasekaran

发明人： Rajiv Chandrasekaran

IPC分类号： H03F126

CPC分类号： H03F1/3229 ,  H03F1/3247

摘要： The signal generated by a high-power amplifier (HPA) operating in its non-linear region is linearized by an amplifier circuit using feed-forward compensation in which an auxiliary channel relies on a model of the HPA to generate an auxiliary signal that is combined with the HPA output to generate an amplified linearized output signal. The amplifier circuit may be implemented with a pre-distorter in the main amplifier channel to linearize the HPA using both pre-compensation and feed-forward compensation. Using the HPA model in the auxiliary channel enables the auxiliary signal to be generated without directly relying on the HPA output. This enables the amplifier circuit to be implemented without having to delay the high-power HPA output signal prior to being synchronously combined with the auxiliary signal. In preferred embodiments, the auxiliary channel signal is generated using a relatively low-power amplifier operating in its linear region.

摘要翻译： 由在其非线性区域中工作的高功率放大器（HPA）产生的信号由使用前馈补偿的放大器电路线性化，其中辅助通道依赖于HPA的型号以产生组合的辅助信号 HPA输出端产生放大的线性化输出信号。 放大器电路可以用主放大器通道中的预失真器来实现，以使用预补偿和前馈补偿来线性化HPA。 在辅助通道中使用HPA模型可以生成辅助信号，而不需要直接依靠HPA输出。 这使得能够实现放大器电路，而不必在与辅助信号同步组合之前延迟高功率HPA输出信号。 在优选实施例中，使用在其线性区域中工作的相对低功率放大器来产生辅助信道信号。

公开(公告)号：US20120288028A1

公开(公告)日：2012-11-15

申请号：US13431398

申请日：2012-03-27

申请人： Rajiv Chandrasekaran

发明人： Rajiv Chandrasekaran

IPC分类号： H04L25/49

CPC分类号： H03F1/3247

摘要： A non-linear power amplifier generates an amplified output signal based on a pre-distorted signal generated by a digital pre-distorter (DPD) based on an input signal. A feedback path generates a feedback signal based on the amplified output signal. The feedback signal is aligned with the input signal, or vice versa, and the aligned signals are used to adaptively update the DPD processing. In particular, a linear FIR filter is estimated to minimize a cost function based on the input and feedback signals. Depending on how the filter is generated, the filter is applied to the input signal or to the feedback signal to generate the aligned input and feedback signals.

摘要翻译： 非线性功率放大器基于由数字预失真器（DPD）产生的预失真信号，基于输入信号产生放大的输出信号。 反馈路径基于放大的输出信号产生反馈信号。 反馈信号与输入信号对齐，反之亦然，对齐的信号用于自适应更新DPD处理。 特别地，线性FIR滤波器被估计为基于输入和反馈信号来最小化成本函数。 根据滤波器的生成方式，将滤波器应用于输入信号或反馈信号，以生成对齐的输入和反馈信号。

公开(公告)号：US20120286985A1

公开(公告)日：2012-11-15

申请号：US13289010

申请日：2011-11-04

申请人： Rajiv Chandrasekaran ,  George P. Vella-Coleiro

发明人： Rajiv Chandrasekaran ,  George P. Vella-Coleiro

IPC分类号： H03M1/66

CPC分类号： H03F1/3247 ,  H03F3/24

摘要： A non-linear amplifier is linearized using interpolation-based digital pre-distortion (DPD). In one embodiment, the digital input signal is interpolated to generate a higher-sample-rate signal that is then pre-distorted. The resulting higher-sample-rate pre-distorted signal is then decimated to generate a final pre-distorted digital signal that is converted into an analog pre-distorted signal by a digital-to-analog converter (DAC) before being applied to the amplifier. In a polyphase embodiment, different versions of the original input digital signal are generated, where each version is then pre-distorted using a different DPD module to generate a different intermediate pre-distorted digital signal. The intermediate pre-distorted signals are filtered and combined to generate the final pre-distorted digital signal. In both embodiments, better linearization (e.g., less aliasing) can be achieved without increasing the sample rate of the DAC and, in the polyphase embodiment, without increasing the processing speed of the DPD modules.

摘要翻译： 使用基于插值的数字预失真（DPD）线性化非线性放大器。 在一个实施例中，内插数字输入信号以产生然后被预失真的较高采样率信号。 然后抽取所得到的较高采样率预失真信号，以产生最终的预失真数字信号，该数字信号在施加到放大器之前由数模转换器（DAC）转换成模拟预失真信号 。 在多相实施例中，生成不同版本的原始输入数字信号，其中每个版本然后使用不同的DPD模块进行预失真以产生不同的中间预失真数字信号。 中间预失真信号被滤波和组合以产生最终的预失真数字信号。 在两个实施例中，可以在不增加DAC的采样率的同时在多相实施例中实现更好的线性化（例如，较少的混叠），而不增加DPD模块的处理速度。

公开(公告)号：US07403573B2

公开(公告)日：2008-07-22

申请号：US10342633

申请日：2003-01-15

申请人： William P. DeBruyn ,  Edward V. Louis ,  Rajiv Chandrasekaran

发明人： William P. DeBruyn ,  Edward V. Louis ,  Rajiv Chandrasekaran

IPC分类号： H04K1/02

CPC分类号： H03F1/3241 ,  H04L27/368

摘要： An uncorrelated adaptive predistorer configured for use with an RF power amplifier having an input loop configured to be coupled to the input of the RF power amplifier an output loop coupled to the output of the RF power amplifier. Such an input loop includes a look-up table containing predistortion values to be apply to an input signal, in response to a monotonically increasing function of the input signal power, for forming a predistorted input signal. Such an output loop configured to measure an intermodulation distortion product of the RF power amplifier output resulting from the predistorted input signal, and operable to update the predistortion values in the look-up table.

摘要翻译： 一种不相关的自适应预分配器，被配置为与具有输入回路的RF功率放大器一起使用，该输入回路被配置为耦合到RF功率放大器的输出端，输出回路耦合到RF功率放大器的输出端。 这样的输入回路包括响应于输入信号功率的单调增加的功能而包含用于输入信号的预失真值的查找表，用于形成预失真的输入信号。 这种输出回路被配置为测量由预失真输入信号产生的RF功率放大器输出的互调失真积，并且可操作以更新查找表中的预失真值。

公开(公告)号：US06801086B1

公开(公告)日：2004-10-05

申请号：US10245008

申请日：2002-09-17

申请人： Rajiv Chandrasekaran

发明人： Rajiv Chandrasekaran

IPC分类号： H03F126

CPC分类号： H03F1/3252 ,  H03F1/3247 ,  H03F1/3258

摘要： A pre-distorter pre-distorts an input signal prior to being applied to an amplifier in order to reduce spurious emissions in the resulting amplified signal. The pre-distorter implements an inverted version of a model of the amplifier that models both the frequency independent (FI) characteristics of the amplifier as well as the frequency-independent (FD) characteristics of the amplifier. Techniques and architectures are presented for (1) generating and updating the model, (2) inverting the model, and (3) updating the inverted model.

摘要翻译： 预失真器在施加到放大器之前预先输入输入信号，以便减少所产生的放大信号中的杂散发射。 预失真器实现放大器模型的反相版本，其模拟放大器的频率独立（FI）特性以及放大器的频率独立（FD）特性。 提出了技术和架构（1）生成和更新模型，（2）反演模型，（3）更新倒置模型。

公开(公告)号：US08711976B2

公开(公告)日：2014-04-29

申请号：US13398088

申请日：2012-02-16

申请人： Rajiv Chandrasekaran

发明人： Rajiv Chandrasekaran

IPC分类号： H04K1/02 ,  H04L25/03 ,  H04L25/49

CPC分类号： H03F3/24 ,  H03F1/3247 ,  H03F1/3294 ,  H03F3/195 ,  H03F2200/336 ,  H03F2200/451 ,  H03F2201/3212 ,  H03F2201/3233 ,  H04L27/368

摘要： An input signal is pre-distorted to reduce distortion resulting from subsequent signal amplification. Frequency-dependent pre-distortion is preferably implemented in combination with frequency-independent pre-distortion, where the frequency-dependent pre-distortion is generated by expanding the derivative of a product of a pre-distortion function and the input signal and then relaxing constraints on the pre-distortion function and/or on frequency-dependent filtering associated with the frequency-dependent pre-distortion. In one implementation, four different frequency-dependent pre-distortion signals are generated for the expansion using up to four different pre-distortion functions and up to four different frequency-dependent filters.

摘要翻译： 输入信号是预失真的，以减少后续信号放大产生的失真。 频率相关的预失真优选地与频率无关的预失真结合实现，其中通过扩展预失真函数和输入信号的乘积的导数然后放宽约束来产生与频率相关的预失真 关于预失真功能和/或与频率相关的预失真相关联的频率依赖滤波。 在一个实施方案中，使用最多四个不同的预失真功能和多达四个不同的频率相关滤波器来生成用于扩展的四个不同的频率相关的预失真信号。

公开(公告)号：US08537041B2

公开(公告)日：2013-09-17

申请号：US13289010

申请日：2011-11-04

申请人： Rajiv Chandrasekaran ,  George P. Vella-Coleiro

发明人： Rajiv Chandrasekaran ,  George P. Vella-Coleiro

IPC分类号： H03M1/66

CPC分类号： H03F1/3247 ,  H03F3/24

摘要： A non-linear amplifier is linearized using interpolation-based digital pre-distortion (DPD). In one embodiment, the digital input signal is interpolated to generate a higher-sample-rate signal that is then pre-distorted. The resulting higher-sample-rate pre-distorted signal is then decimated to generate a final pre-distorted digital signal that is converted into an analog pre-distorted signal by a digital-to-analog converter (DAC) before being applied to the amplifier. In a polyphase embodiment, different versions of the original input digital signal are generated, where each version is then pre-distorted using a different DPD module to generate a different intermediate pre-distorted digital signal. The intermediate pre-distorted signals are filtered and combined to generate the final pre-distorted digital signal. In both embodiments, better linearization (e.g., less aliasing) can be achieved without increasing the sample rate of the DAC and, in the polyphase embodiment, without increasing the processing speed of the DPD modules.

摘要翻译： 使用基于插值的数字预失真（DPD）线性化非线性放大器。 在一个实施例中，内插数字输入信号以产生然后被预失真的较高采样率信号。 然后抽取所得到的较高采样率预失真信号，以产生最终的预失真数字信号，该数字信号在施加到放大器之前由数模转换器（DAC）转换成模拟预失真信号 。 在多相实施例中，生成不同版本的原始输入数字信号，其中每个版本然后使用不同的DPD模块进行预失真以产生不同的中间预失真数字信号。 中间预失真信号被滤波和组合以产生最终的预失真数字信号。 在两个实施例中，可以在不增加DAC的采样率的同时在多相实施例中实现更好的线性化（例如，较少的混叠），而不增加DPD模块的处理速度。

公开(公告)号：US08660207B2

公开(公告)日：2014-02-25

申请号：US13431398

申请日：2012-03-27

申请人： Rajiv Chandrasekaran

发明人： Rajiv Chandrasekaran

IPC分类号： H04K1/02

CPC分类号： H03F1/3247

摘要： A non-linear power amplifier generates an amplified output signal based on a pre-distorted signal generated by a digital pre-distorter (DPD) based on an input signal. A feedback path generates a feedback signal based on the amplified output signal. The feedback signal is aligned with the input signal, or vice versa, and the aligned signals are used to adaptively update the DPD processing. In particular, a linear FIR filter is estimated to minimize a cost function based on the input and feedback signals. Depending on how the filter is generated, the filter is applied to the input signal or to the feedback signal to generate the aligned input and feedback signals.

摘要翻译： 非线性功率放大器基于由数字预失真器（DPD）产生的预失真信号，基于输入信号产生放大的输出信号。 反馈路径基于放大的输出信号产生反馈信号。 反馈信号与输入信号对齐，反之亦然，对齐的信号用于自适应更新DPD处理。 特别地，线性FIR滤波器被估计为基于输入和反馈信号来最小化成本函数。 根据滤波器的生成方式，将滤波器应用于输入信号或反馈信号，以生成对齐的输入和反馈信号。