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1. 发明授权

US07113036B2 Method and apparatus for adaptive digital predistortion using nonlinear and feedback gain parameters 有权
标题翻译：使用非线性和反馈增益参数的自适应数字预失真的方法和装置
公开(公告)号：US07113036B2
公开(公告)日：2006-09-26
申请号：US10825614
申请日：2004-04-15
申请人： James P. Moffatt , Jeffrey H. Saunders
发明人： James P. Moffatt , Jeffrey H. Saunders
IPC分类号： H03F1/26
CPC分类号： H03F1/3247 , H03F1/3252 , H03F1/3258 , H03F1/3294
摘要： A predistorter is disclosed that predistorts an input signal based on one or more static coefficients that are representative of a non-linear distortion characteristic of an amplifier. The input signal is also processed based on a non-linear gain parameter that reduces an error metric between the input signal and a feedback signal. The nonlinear gain parameter adapts an amount of nonlinearity introduced by the predistorter. The non-linear gain adaptation is performed, for example, when the input voltage is above a threshold input voltage. The input signal can be processed by multiplying the input signal by the non-linear gain parameter followed by table-coefficient processing, or by both multiplying the input by the non-linear gain parameter followed by dividing the table-coefficient processed output signal by the same non-linear gain parameter. The input signal can also be processed based on a feedback gain parameter that compensates for a small-signal gain of the feedback loop. The feedback gain parameter attempts to maintain a small-signal gain of approximately unity.
摘要翻译：公开了一种预失真器，其基于代表放大器的非线性失真特性的一个或多个静态系数来预失真输入信号。还基于减小输入信号和反馈信号之间的误差度量的非线性增益参数来处理输入信号。非线性增益参数适应预失真器引入的非线性量。例如，当输入电压高于阈值输入电压时执行非线性增益适配。输入信号可以通过将输入信号乘以非线性增益参数，然后进行表格系数处理，或者将输入乘以非线性增益参数，然后将表格系数处理的输出信号除以相同的非线性增益参数。还可以基于补偿反馈回路的小信号增益的反馈增益参数来处理输入信号。反馈增益参数尝试维持近似一致的小信号增益。

2. 发明授权

US06901108B2 Apparatus and method for adaptive control 有权
标题翻译：用于自适应控制的装置和方法
公开(公告)号：US06901108B2
公开(公告)日：2005-05-31
申请号：US09849852
申请日：2001-05-04
申请人： James Russell Blodgett , Gerald L. Frazer , Michael W Goodwin , Karen E. Leonard , James P Moffatt , Fan Zhang
发明人： James Russell Blodgett , Gerald L. Frazer , Michael W Goodwin , Karen E. Leonard , James P Moffatt , Fan Zhang
IPC分类号： H04L1/00 , G05B5/01 , G05B13/02 , H04B3/04 , H04L25/03 , H03K5/159
CPC分类号： G05B5/01 , G05B13/024 , H04L25/03038 , H04L2025/03681 , H04L2025/03707
摘要： An adaptive controller generates a sequence of dither signals for each of a plurality of control parameters. Each dither signal sequence is uncorrelated with every other dither signal sequence. Each nominal control signal has the first of its respective dither signal values simultaneously summed with it to form the control parameter values used by the controller. Updated control signals are applied in parallel to the controller outputs and a performance measure is taken and stored. The second signals in the dither control sequences are then summed with their respective nominal controls and applied in parallel to the controller and a second performance measure is taken and stored. This process is repeated for the length of the dither control signal sequence to yield a sequence of performance measurements. The sequence of performance measurements is correlated with each of the dither sequences, forming sequences of correlator outputs, one for each control signal. Each correlator output sequence is integrated and, depending upon the value of a correlator's integration output, the corresponding nominal signal has it's dither value added to or subtracted from it to form the respective, updated control values.
摘要翻译：自适应控制器为多个控制参数中的每一个生成抖动信号序列。每个抖动信号序列与每隔一个抖动信号序列不相关。每个标称控制信号使其相应的抖动信号值中的第一个与其相加，形成由控制器使用的控制参数值。更新的控制信号与控制器输出并行应用，并采取并存储性能测量。然后将抖动控制序列中的第二个信号与其相应的标称控制相加并并行施加到控制器，并采集并存储第二个性能测量。对于抖动控制信号序列的长度重复该过程以产生性能测量序列。性能测量的顺序与每个抖动序列相关，形成相关器输出的序列，每个控制信号一个。每个相关器输出序列被积分，并且根据相关器的积分输出的值，相应的标称信号使其具有抖动值被加到或从其中减去以形成相应的更新的控制值。

3. 发明授权

US4993047A Volterra linearizer for digital transmission 失效
标题翻译： Volterra线性化数字传输
公开(公告)号：US4993047A
公开(公告)日：1991-02-12
申请号：US402750
申请日：1989-09-05
申请人： James P. Moffatt , Mitchell A. Skinner
发明人： James P. Moffatt , Mitchell A. Skinner
IPC分类号： H04L27/01 , H03F1/32 , H04B3/06 , H04B7/005 , H04L25/03 , H04L27/36 , H04L27/38
CPC分类号： H04L27/368 , H03F1/3223 , H04L27/3809 , H04L27/3872
摘要： Characterized nonlinearities in a QAM transmission channel are removed by this linearizer, in which selected bits from a sequence of received symbols on both rails form the address of a PROM. Stored values represent the Volterra expansion of the response of the channel, including the nonlinearity, to the symbol sequence. Symmetries in the Volterra expansion allow the same stored value to be used to correct both AM/AM same rail and AM/PM opposite rail distortion.

4. 发明授权

US4532477A Distortion compensation for a microwave amplifier 失效
标题翻译：微波放大器的失真补偿
公开(公告)号：US4532477A
公开(公告)日：1985-07-30
申请号：US565185
申请日：1983-12-23
申请人： Donald R. Green, Jr. , James P. Moffatt
发明人： Donald R. Green, Jr. , James P. Moffatt
IPC分类号： H03C3/38 , H03F1/30 , H03F1/32 , H03F3/60 , H03F3/16
CPC分类号： H03F1/306 , H03F1/3241 , H03F3/601
摘要： Amplifier-produced distortion known as amplitude modulation to phase modulation (AM/PM) conversion is reduced through the use of GaAs FETs which are biased to generate AM/PM having an algebraic sign opposite to that generated by the amplifier. This algebraic sign reversal is accomplished by biasing the GaAs FETs so that a DC drain current .ltoreq.75% and .gtoreq.10% of the short-circuit drain current is established. In the disclosed embodiment, several GaAs FETs are cascaded in alternation with attenuators to increase the magnitude of the compensating AM/PM conversion without generating substantial amplitude modulation to amplitude modulation (AM/PM) conversion.
摘要翻译：通过使用被偏置以产生具有与由放大器产生的代数符号相反的代数符号的AM / PM的GaAs FET来减少被称为幅度调制到相位调制（AM / PM）转换的放大器产生的失真。这种代数符号反转是通过偏置GaAs FET来实现的，从而建立了短路漏极电流的直流漏极电流<75％和> / = 10％。在所公开的实施例中，几个GaAs FET与衰减器交替地级联，以增加补偿AM / PM转换的幅度，而不产生幅度调制（AM / PM）转换的实质幅度调制。

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