公开(公告)号：US07756493B2

公开(公告)日：2010-07-13

申请号：US11392170

申请日：2006-03-29

申请人： Richard Neil Braithwaite

发明人： Richard Neil Braithwaite

IPC分类号： H04B1/04

CPC分类号： H03F1/3235 ,  H03F1/3241 ,  H03F2200/198 ,  H03F2201/3212 ,  H03F2201/3215

摘要： A pilot system and method is disclosed that increases the rate of convergence of the second loop alignment control in a feed forward amplifier. Both a pilot generation and detection system and search algorithm controlling the alignment are disclosed. By measuring the frequency of the generated pilot, phase information regarding the second loop cancellation transfer function can be inferred. Changes in the pilot frequency as the search algorithm makes steps in the second loop alignment indicate errors in the direction of the search. Using this pilot frequency measurement along with the existing log-power measurement of the residual pilot power improves the convergence speed because fewer steps will be made to reach the optimal alignment setting.

摘要翻译： 公开了一种提高前馈放大器中的第二环路对准控制的收敛速度的导频系统和方法。 公开了控制对准的导频生成和检测系统和搜索算法。 通过测量产生的导频的频率，可以推断出关于第二循环消除传递函数的相位信息。 搜索算法使第二循环对齐中的步骤的导频频率的变化表示搜索方向上的错误。 使用该导频测量以及剩余导频功率的现有对数功率测量提高了收敛速度，因为将达到最佳对准设置的步骤较少。

公开(公告)号：US20090291632A1

公开(公告)日：2009-11-26

申请号：US12468710

申请日：2009-05-19

申请人： Richard Neil Braithwaite ,  Scott Carichner ,  Mark Cope

发明人： Richard Neil Braithwaite ,  Scott Carichner ,  Mark Cope

IPC分类号： H04B3/36

CPC分类号： H04B7/15585

摘要： An adaptive echo cancellation system and method employing an algorithm suitable for a digital repeater with sub-band filtering is disclosed. Cross- and auto-correlation measurements used to estimate the residual coupling are computed from normalized cross and power spectrums which avoid the problems associated with narrow bandwidth signal components. The normalized cross- and power spectra are additionally masked in frequency to reduce the influence of interfering spectral components outside of the passband of the sub-band filter. Regularization of the iterative estimation process is applied to maintain stability and compensate for the bandwidth reduction associated with the sub-band filter and the spectral mask.

摘要翻译： 公开了一种使用适用于具有子带滤波的数字中继器的算法的自适应回波消除系统和方法。 用于估计残差耦合的交叉和自相关测量是从归一化的交叉和功率谱计算出来的，可避免与窄带宽信号分量相关的问题。 标准化的交叉和功率谱在频率上被额外屏蔽以减少在子带滤波器的通带之外的干扰频谱分量的影响。 应用迭代估计过程的正则化来维持稳定性并补偿与子带滤波器和频谱掩模相关联的带宽减小。

公开(公告)号：US07149257B2

公开(公告)日：2006-12-12

申请号：US10881476

申请日：2004-06-30

申请人： Richard Neil Braithwaite

发明人： Richard Neil Braithwaite

IPC分类号： H04K1/02

CPC分类号： H03F1/3247 ,  H03F2201/3224 ,  H03F2201/3233

摘要： A system and method of correcting memory effects present within power amplifiers using digital predistortion and an improved power amplifier system employing digital predistortion are disclosed. Nonlinearities within a power amplifier having an input derived from a digital signal are compensated by injecting a digital correction signal prior to the power amplifier. A system and method for modeling the distortion created by power amplifier memory effects and generating the desired digital predistortion correction signal are disclosed.

摘要翻译： 公开了一种使用数字预失真校正功率放大器内存储效应的系统和方法，以及采用数字预失真的改进的功率放大器系统。 通过在功率放大器之前注入数字校正信号来补偿具有从数字信号导出的输入的功率放大器内的非线性。 公开了一种用于对由功率放大器存储器效应产生的失真进行建模并产生期望的数字预失真校正信号的系统和方法。

公开(公告)号：US07123086B2

公开(公告)日：2006-10-17

申请号：US10838985

申请日：2004-05-05

申请人： Richard Neil Braithwaite

发明人： Richard Neil Braithwaite

IPC分类号： H03F3/66

CPC分类号： H03F1/3235

摘要： A pilot generation and detection system within a feed forward power amplifier that uses positive feedback to create a narrow bandwidth limit cycle is disclosed. The pilot system adjusts its frequency automatically to keep a desirable phase relationship between the pilot generation and detection. As a result, quadrature modulation/detection of the pilot used in prior approaches to ensure reliable estimates of the detected pilot power is unnecessary. This reduces the cost of the system. In addition, the pilot system turns the pilot amplitude ‘on’ or ‘off’ as needed. When the alignment of the second loop is good, the positive feedback will not have sufficient gain to maintain a limit cycle. As a result, the pilot will turn off when the second loop has converged. The pilot will return automatically as a by-product of the positive feedback if the second loop alignment degrades. Turning off the pilot when the second loop has converged reduces the pilot spurs appearing at the output of the feed forward amplifier. In addition, turning off the pilot reduces the power in the error amplifier, which in turn, allows the transistor size to be reduced.

摘要翻译： 公开了一种使用正反馈创建窄带宽限制周期的前馈功率放大器内的导频生成和检测系统。 导频系统自动调整频率，以保持导频生成和检测之间的期望的相位关系。 结果，不需要在先前方法中使用的导频的正交调制/检测来确保检测到的导频功率的可靠估计。 这降低了系统的成本。 此外，导频系统根据需要使导频振幅“开”或“关”。 当第二回路的对准良好时，正反馈将不具有足够的增益以维持极限循环。 因此，当第二回路收敛时，飞行员将关闭。 如果第二回路对准降级，飞行员将作为正反馈的副产品自动返回。 当第二个回路已收敛时，关闭飞行员可以减少出现在前馈放大器输出端的飞行员马刺。 此外，关断引导器会降低误差放大器的功率，从而降低晶体管尺寸。

公开(公告)号：US07002407B2

公开(公告)日：2006-02-21

申请号：US10733498

申请日：2003-12-11

申请人： Matthew J. Hunton ,  Richard Neil Braithwaite

发明人： Matthew J. Hunton ,  Richard Neil Braithwaite

IPC分类号： H03F3/66 ,  H03F1/26

CPC分类号： H03F1/26 ,  H03F1/3235

摘要： A delay mismatched feed forward amplifier system employing a control system and method using floors and penalties is disclosed. The disclosed control system and method allows the second loop phase adjuster setting to be offset in a repeatable and controlled manner. Applying floors and penalties to offset the steady-state phase adjuster setting modifies the conventional pilot cancellation approach. In the conventional case, pilot cancellation has a distinct minimum that corresponds to the desired adjustment setting. In the disclosed approach, the measured pilot cancellation is clipped to a lower bound or floor to produce a set of equal valued minimum control results. The floor is selected to place a desired phase offset to the phase adjuster at the edge of minimum floor. To ensure that the correct phase adjuster offset is selected from the set of equal valued minimum control results, a control direction based penalty is added. By including both the floor and penalty, the phase adjuster steady state offset will be controlled to the edge of the minimum floor.

摘要翻译： 公开了采用控制系统的延迟失配的前馈放大器系统和使用楼层和罚款的方法。 所公开的控制系统和方法允许以可重复和受控的方式偏移第二回路相位调节器设置。 应用楼层和罚款以抵消稳态相位调整器设置，修改了常规的先导取消方法。 在常规情况下，导频消除具有对应于期望的调整设置的明显的最小值。 在所公开的方法中，测量的导频消除被剪切到下限或下限以产生一组等价的最小控制结果。 选择地板以在相位调整器的最小楼层边缘放置期望的相位偏移。 为了确保从等值最小控制结果的集合中选择正确的相位调整器偏移，增加了基于控制方向的惩罚。 通过包括地板和罚款，相位调整器稳态偏移将被控制在最小楼层的边缘。