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1.发明申请公开(公告)号：US20150031318A1
公开(公告)日：2015-01-29
申请号：US13949962
申请日：2013-07-24
申请人： CrestCom, Inc.
CPC分类号： H03F1/3247 , H03F1/0222 , H03F3/193 , H03F3/2171 , H03F3/245 , H03F3/45475 , H03F2200/432 , H04B1/62
摘要： A transmitter (32) generates a time-varying stabilized bias signal (82) from which sub-RF distortion signals (26, 29) have been cancelled. The distortion signals (26, 29) are byproducts of imperfect amplification and of biasing networks. An envelope amplifier (84) includes a high bandwidth differential input, linear, bias signal amplifier (120) and a low bandwidth switching amplifier (122) coupled together to achieve both a high bandwidth and high efficiency. A control loop (154) feeds a portion of the voltage V(t) from a conduction node (146) of the RF power amplifier (36) to one of the differential inputs of the linear bias signal amplifier (120), while a bias control signal (92) drives the other differential input. The portion of voltage V(t) fed to bias signal amplifier (120) is a low power portion from which the RF portion has been removed. A bias signal (128) may be predistorted to cancel distortion signals (26, 29).
摘要翻译： 发射机（32）产生时变稳定的偏置信号（82），从而从其中消除了子RF失真信号（26,29）。 失真信号（26,29）是不完美的放大和偏置网络的副产品。 包络放大器（84）包括耦合在一起以实现高带宽和高效率的高带宽差分输入，线性偏置信号放大器（120）和低带宽开关放大器（122）。 控制回路（154）将来自RF功率放大器（36）的导通节点（146）的电压V（t）的一部分馈送到线性偏置信号放大器（120）的差分输入之一，而偏置 控制信号（92）驱动另一个差分输入。 馈送到偏置信号放大器（120）的电压V（t）的部分是RF部分已被去除的低功率部分。 偏置信号（128）可以被预失真以消除失真信号（26,29）。
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公开(公告)号：US08934573B2
公开(公告)日：2015-01-13
申请号：US14070946
申请日：2013-11-04
申请人： CrestCom, Inc.
CPC分类号： H04L25/03343 , H03F1/0261 , H03F1/3205 , H03F1/34 , H03F1/56 , H03F3/24 , H03F3/245 , H03F3/60 , H03F2200/15 , H03F2200/18 , H03F2200/423 , H03F2200/438 , H03F2200/451 , H04B2001/0433
摘要： An RF transmitter (10) includes an RF amplifier (28) that generates an amplified RF signal (36) including a linear RF signal (92) and a spurious baseband signal (94). The spurious baseband signal (94) interacts with bias feed networks (56, 66) to cause the RF amplifier (28) to generate an unwanted RF distortion at or near the allocated RF bandwidth. A baseband compensation signal (98) is generated and equalized in an adaptive equalizer (102) then fed to the RF amplifier (28). A feedback signal (46) is obtained from the RF amplifier (28) and used to drive the adaptive equalizer (102). A feedback loop causes the adaptive equalizer to adjust a baseband signal (24, 32) supplied to the RF amplifier (28) so that the RF distortion is minimized.
摘要翻译： RF发射器（10）包括产生包括线性RF信号（92）和伪基带信号（94）的放大RF信号（36）的RF放大器（28）。 伪基带信号（94）与偏置馈电网络（56,66）相互作用，以使RF放大器（28）在分配的RF带宽处或附近产生不期望的RF失真。 在自适应均衡器（102）中生成并均衡基带补偿信号（98），然后馈送到RF放大器（28）。 从RF放大器（28）获得反馈信号（46）并用于驱动自适应均衡器（102）。 反馈环路使得自适应均衡器调整提供给RF放大器（28）的基带信号（24,32），使得RF失真最小化。
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公开(公告)号：US20140056343A1
公开(公告)日：2014-02-27
申请号：US14070946
申请日：2013-11-04
申请人： CrestCom, Inc.
IPC分类号： H04L25/03
CPC分类号： H04L25/03343 , H03F1/0261 , H03F1/3205 , H03F1/34 , H03F1/56 , H03F3/24 , H03F3/245 , H03F3/60 , H03F2200/15 , H03F2200/18 , H03F2200/423 , H03F2200/438 , H03F2200/451 , H04B2001/0433
摘要： An RF transmitter (10) includes an RF amplifier (28) that generates an amplified RF signal (36) including a linear RF signal (92) and a spurious baseband signal (94). The spurious baseband signal (94) interacts with bias feed networks (56, 66) to cause the RF amplifier (28) to generate an unwanted RF distortion at or near the allocated RF bandwidth. A baseband compensation signal (98) is generated and equalized in an adaptive equalizer (102) then fed to the RF amplifier (28). A feedback signal (46) is obtained from the RF amplifier (28) and used to drive the adaptive equalizer (102). A feedback loop causes the adaptive equalizer to adjust a baseband signal (24, 32) supplied to the RF amplifier (28) so that the RF distortion is minimized.
摘要翻译： RF发射器（10）包括产生包括线性RF信号（92）和伪基带信号（94）的放大RF信号（36）的RF放大器（28）。 伪基带信号（94）与偏置馈电网络（56,66）相互作用，以使RF放大器（28）在分配的RF带宽处或附近产生不期望的RF失真。 在自适应均衡器（102）中生成并均衡基带补偿信号（98），然后馈送到RF放大器（28）。 从RF放大器（28）获得反馈信号（46）并用于驱动自适应均衡器（102）。 反馈环路使得自适应均衡器调整提供给RF放大器（28）的基带信号（24,32），使得RF失真最小化。
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4.发明授权Transmitter linearized in response to signal magnitude derivative parameter and method therefor 有权发射机根据信号幅度导数参数及其方法进行线性化公开(公告)号：US08615208B2
公开(公告)日：2013-12-24
申请号：US13019173
申请日：2011-02-01
CPC分类号： H04B1/0475 , H03F1/02 , H03F1/0266 , H03F1/3241 , H03F1/3247 , H03F1/34 , H03F3/195 , H03F3/24 , H03F3/245 , H03F2200/336 , H03F2201/3233 , H04B2001/0425 , H04B2001/0433 , H04B2001/045
摘要： A transmitter (50) includes a low power nonlinear predistorter (58) that inserts predistortion configured to compensate for a memoryless nonlinearity (146) corresponding to gain droop and another memoryless nonlinearity (148) corresponding to a video signal. When efforts are taken to reduce memory effects, such as configuring a network of components (138) that couple to an HPA (114) to avoid resonance frequencies within a video bandwidth (140), high performance linearization at low power results without extending linearization beyond that provided by the memoryless nonlinear predistorter (58). A look-up table (282) has address inputs responsive to a magnitude parameter (152) of a communication signal (54), a magnitude derivative parameter (204) of the communication signal (54), and possibly one or more variable bias parameters (85). The look-up table (282) produces a gain-correcting signal (284) that adjusts the gain applied to the communication signal (54) prior to amplification. The look-up table (282) is updated in response to an LMS control loop.
摘要翻译： 发射机（50）包括低功率非线性预失真器（58），其插入被配置为补偿对应于增益下降的无记忆非线性（146）的预失真和对应于视频信号的另一无记忆非线性（148）。 当努力减少存储器效应时，例如配置耦合到HPA（114）的组件网络（138）以避免视频带宽（140）内的共振频率，在低功率下实现高性能线性化，而不会延长线性化超出 由无记忆非线性预失真器（58）提供。 查找表（282）具有响应于通信信号（54）的幅度参数（152），通信信号（54）的幅度导数参数（204）以及可能的一个或多个可变偏置参数的地址输入 （85）。 查找表（282）产生增益校正信号（284），其在放大之前调整施加到通信信号（54）的增益。 响应于LMS控制循环来更新查找表（282）。
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5.发明申请Transmitter Linearized Using Inversing and Non-Inversing Transform Processing Sections and Method Therefor 有权使用反转和非反相变换处理的变送器线性化及其方法公开(公告)号：US20120034886A1
公开(公告)日：2012-02-09
申请号：US12860436
申请日：2010-08-20
IPC分类号： H01Q11/12
CPC分类号： H03F1/3247 , H03F1/3241 , H03F3/24 , H03F2201/3224 , H03F2201/3233 , H04B2001/0425
摘要： A transmitter (50) includes a nonlinear predistorter (58) having two instances of an inverting transform (106, 106′) that may be implemented in a look-up table (122) and that implements a transform which is the inverse of an average terms component (96) of a nonlinear transform model (94) for an amplifier (70). The look-up table (122) may be updated using a continuous process control loop that avoids Cartesian to polar coordinate conversions. One of the two instances of the inverting transform (106) is cascaded with a non-inversing transform (108) within a residual cancellation section (110) of the predistorter (58). The non-inversing transform (108) implements a transform which is an estimate of a deviation terms component (98) of the nonlinear transform model (94). The residual cancellation section (110) produces a weak signal that replaces an unwanted residual term in an amplified communication signal (76) with a much weaker residual term.
摘要翻译： 发射机（50）包括具有可以在查找表（122）中实现并且实现与平均值相反的变换的反向变换（106,106'）的两个实例的非线性预失真器（58） 用于放大器（70）的非线性变换模型（94）的项分量（96）。 可以使用避免笛卡尔到极坐标转换的连续过程控制循环来更新查找表（122）。 反相变换（106）的两个实例之一与预失真器（58）的残余消除部分（110）内的非反相变换（108）级联。 非反转变换（108）实现变换，其是非线性变换模型（94）的偏差项分量（98）的估计。 残余消除部分（110）产生弱信号，其以较弱的残余项替代放大的通信信号（76）中的不需要的残余项。
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6.发明申请TRANSMIT-CANCELING TRANSCEIVER RESPONSIVE TO HEAT SIGNAL AND METHOD THEREFOR 审中-公开发送取消收发器响应于热信号及其方法公开(公告)号：US20090323856A1
公开(公告)日：2009-12-31
申请号：US12163013
申请日：2008-06-27
IPC分类号： H04L25/49
CPC分类号： H04L25/0305 , H04B1/525 , H04L2025/03592
摘要： A transmit-canceling transceiver (10) generates a heat signal (84) that estimates heating in analog components which process a transmit signal (22). An equalizer (74) having taps (77) provided by a tap update section (78) processes the transmit signal (22) for use in a cancellation operation. The tap update section (78) includes a coefficient update section (82) and a heat adjustment section (80). The coefficient update section (82) implements a feedback loop to generate coefficients (86) which are substantially unresponsive to the heat signal (84). The heat adjustment section (80) closes a feedback loop which is responsive to the heat signal (84) and generates offsets (142) that are used to adjust the coefficients (86) to compensate for heating. The loop bandwidth of the feedback loop of coefficient update section (82) is sufficiently narrow so as to be unable to track dynamic heat effects from the analog components.
摘要翻译： 发射消除收发器（10）产生估计处理发射信号（22）的模拟分量中的加热的热信号（84）。 由抽头更新部分（78）提供的具有抽头（77）的均衡器（74）处理用于取消操作的发送信号（22）。 抽头更新部分（78）包括系数更新部分（82）和热调节部分（80）。 系数更新部分（82）实现反馈回路以产生对热信号（84）基本上不响应的系数（86）。 热调节部分（80）关闭响应于热信号（84）的反馈回路，并产生用于调整系数（86）以补偿加热的偏移（142）。 系数更新部分（82）的反馈回路的环路带宽足够窄，从而不能跟踪模拟部件的动态热效应。
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公开(公告)号：US07542519B2
公开(公告)日：2009-06-02
申请号：US11323686
申请日：2005-12-29
CPC分类号： H04B1/0075 , H03F1/3247 , H03F1/34 , H03F3/24 , H04B1/0475 , H04B2001/0433
摘要： An RF transmitter (10) is configured to transmit either wideband multichannel modulations or narrowband multichannel modulations in a variety of licensed frequency bands (70) using a single set of hardware. For narrowband modulations, a digital IF upconversion stage is performed so that, after upconversion to RF, image signals 74 are sufficiently displaced from the licensed frequency band (70) so as to be filtered off. For wideband modulations, no IF modulation stage occurs, and a direct upconversion takes place from baseband to RF. LO leakage is cancelled using a negative feedback loop that combines a digital DC signal with a communication signal (26, 52) prior to a direct or final analog upconversion stage (62).
摘要翻译： RF发射器（10）被配置为使用单组硬件来发射各种许可频带（70）中的宽带多信道调制或窄带多信道调制。 对于窄带调制，执行数字IF上变频级，使得在上变频到RF之后，图像信号74从许可频带（70）充分地移位，以被滤除。 对于宽带调制，不会发生IF调制级，并且从基带到RF的直接上变频。 在直接或最终模拟上变频阶段（62）之前，使用负数反馈回路来消除LO泄漏，该负反馈回路将数字DC信号与通信信号（26,52）组合。
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公开(公告)号：US20090124218A1
公开(公告)日：2009-05-14
申请号：US11939890
申请日：2007-11-14
IPC分类号： H04B1/04
CPC分类号： H03F1/3247 , H03F1/34 , H03F3/24 , H03F2200/207 , H03F2200/447 , H03F2200/451 , H04B2001/0416 , H04B2001/0433
摘要： An RF transmitter (10) includes an RF amplifier (22) that experiences gain-droop distortion as a result of self-heating. A heat compensator (20) is included to insert a gain boost of an amount which is the inverse of the gain droop experienced by the RF amplifier (22). The amount of gain boost is determined by generating a heat signal (88) from low-pass filtering (86) the squared magnitude (82) of a communication signal (14). The heat signal (88) is scaled by a weighting signal (68) estimated by monitoring the amplified RF signal (42) at the output of the RF amplifier (22). A nonlinear relationship section (96) then transforms the scaled signal into a gain-boost signal (94) that corresponds to the inverse of gain droop in the RF amplifier (22).
摘要翻译： RF发射器（10）包括经由自加热结果的增益下垂失真的RF放大器（22）。 包括热补偿器（20）以插入与RF放大器（22）经历的增益下降的倒数的量的增益升高。 通过从通信信号（14）的平方值（82）的低通滤波（86）产生加热信号（88）来确定增益升高量。 通过在RF放大器（22）的输出处监视放大的RF信号（42）估计的加权信号（68）来缩放热信号（88）。 然后，非线性关系部分（96）将缩放的信号变换成对应于RF放大器（22）中的增益下降的倒数的增益 - 升压信号（94）。
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公开(公告)号：US07469491B2
公开(公告)日：2008-12-30
申请号：US11012427
申请日：2004-12-14
IPC分类号： H04K1/02
CPC分类号： H03F1/3247 , H03F1/3241 , H03F1/3252 , H03F1/3258 , H03F1/3294 , H03F1/34 , H03F3/24 , H03F2200/336 , H03H17/0294 , H04B1/0475 , H04B2001/0425 , H04B2001/0433 , H04L5/06 , H04L27/2614
摘要： A digital communications transmitter (100) includes a digital linear-and-nonlinear predistortion section (200, 1800, 2800) to compensate for linear and nonlinear distortion introduced by transmitter-analog components (120). A direct-digital-downconversion section (300) generates a complex digital return-data stream (254) from the analog components (120) without introducing quadrature imbalance. A relatively low resolution exhibited by the return-data stream (254) is effectively increased through arithmetic processing. Distortion introduced by an analog-to-digital converter (304) may be compensated using a variety of adaptive techniques. Linear distortion is compensated using adaptive techniques with an equalizer (246) positioned in the forward-data stream (112). Nonlinear distortion is then compensated using adaptive techniques with a plurality of equalizers (226) that filter a plurality of orthogonal, higher-ordered-basis functions (214) generated from the forward-data stream (112). The filtered-basis functions are combined together and subtracted from the forward-data stream (112).
摘要翻译： 数字通信发射机（100）包括数字线性和非线性预失真部分（200，1800，2800），以补偿由发射机 - 模拟部件（120）引入的线性和非线性失真。 直接数字下变频部分（300）从模拟部件（120）生成复杂的数字返回数据流（254），而不引入正交不平衡。 返回数据流（254）显示的相对低的分辨率通过算术处理有效地增加。 可以使用各种自适应技术来补偿由模数转换器（304）引入的失真。 使用位于前向数据流（112）中的均衡器（246）的自适应技术来补偿线性失真。 然后使用具有多个均衡器（226）的自适应技术来补偿非线性失真，所述多个均衡器对从前向数据流（112）生成的多个正交，高阶基函数（214）进行过滤。 滤波的基函数被组合在一起并从前向数据流（112）中减去。
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10.发明授权公开(公告)号：US07099399B2
公开(公告)日：2006-08-29
申请号：US10766801
申请日：2004-01-27
IPC分类号： H03C5/00
CPC分类号： H03F1/3252 , H03F1/3241 , H03F1/3258 , H03F1/34 , H03F3/24 , H04B1/0475 , H04B2001/0425 , H04B2001/0433 , H04L27/2614
摘要： A digital communications transmitter (100) includes a digital linear-and-nonlinear predistortion section (200) to compensate for linear and nonlinear distortion introduced by transmitter-analog components (120). A direct-digital-downconversion section (300) generates a complex digital return-data stream (254) from the analog components (120) without introducing quadrature imbalance. A relatively low resolution exhibited by the return-data stream (254) is effectively increased through arithmetic processing. Linear distortion is first compensated using adaptive techniques with an equalizer (246) positioned in the forward-data stream (112). Nonlinear distortion is then compensated using adaptive techniques with a plurality of equalizers (226) that filter a plurality of orthogonal, higher-ordered-basis functions (214) generated from the forward-data stream (112). The filtered-basis functions are combined together and subtracted from the forward-data stream (112).
摘要翻译： 数字通信发射机（100）包括用于补偿由发射机 - 模拟部件（120）引入的线性和非线性失真的数字线性和非线性预失真部分（200）。 直接数字下变频部分（300）从模拟部件（120）生成复杂的数字返回数据流（254），而不引入正交不平衡。 返回数据流（254）显示的相对低的分辨率通过算术处理有效地增加。 使用具有位于前向数据流（112）中的均衡器（246）的自适应技术首先补偿线性失真。 然后使用具有多个均衡器（226）的自适应技术来补偿非线性失真，所述多个均衡器对从前向数据流（112）生成的多个正交，高阶基函数（214）进行过滤。 滤波的基函数被组合在一起并从前向数据流（112）中减去。
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