公开(公告)号：US07469026B2

公开(公告)日：2008-12-23

申请号：US10092758

申请日：2002-03-07

申请人： Tien M. Nguyen ,  James Yoh ,  Ashok Mathur ,  Gary W. Goo

发明人： Tien M. Nguyen ,  James Yoh ,  Ashok Mathur ,  Gary W. Goo

IPC分类号： H04L25/38 ,  H03D3/22

CPC分类号： H04L7/0331

摘要： A timing recovery loop includes a random walk filter counter for counting early, nominal and late arrivals of data transitions pulses of an input baseband signal waveform encoding a digital bit stream, and provides magnitude counts that are compared to a threshold value that when exceeded by the magnitude counts results in a delay adjustment of the generated adjusted timing pulses then remaining synchronized with the actual bit timing for maintaining bit timing lock. The adjusted timing pulses can then be used by a data detector for reliable data detection and reconstruction of the digital bit stream. The threshold value can be adaptively adjusted for reducing drop lock rates in the presence of changing channel environments.

摘要翻译： 定时恢复回路包括随机游走滤波器计数器，用于对编码数字比特流的输入基带信号波形的数据转换脉冲的早期，标称和迟到到达进行计数，并提供与阈值相比较的幅度计数， 幅度计数导致所产生的调整定时脉冲的延迟调整，然后与用于维持位定时锁定的实际位定时保持同步。 所调整的定时脉冲然后可被数据检测器用于数字位流的可靠数据检测和重建。 可以自适应地调整阈值，以便在存在不断变化的信道环境的情况下减少丢弃锁定速率。

公开(公告)号：US06307435B1

公开(公告)日：2001-10-23

申请号：US09534105

申请日：2000-03-23

申请人： Tien M. Nguyen ,  James Yoh ,  Andrew S. Parker ,  Diana M. Johnson

发明人： Tien M. Nguyen ,  James Yoh ,  Andrew S. Parker ,  Diana M. Johnson

IPC分类号： H03F126

CPC分类号： H03F1/3241

摘要： A predistortion method use a modified linear-log model for linearizing the output of nonlinear high power amplifiers having inherent amplitude modulation to amplitude modulation distortion, and inherent amplitude modulation to phase modulation distortion, during conversions of an input signal to an output signal. A complex baseband linearizer provides predistortion at baseband for reducing spectral regrowth and improves bit error performance. The predistortion effects are matched to the amplifier distortions to cancel out the distortions to provide linearized conversions. The modified linear-log model is used to reduce the clipping effects through the peak operating point for a specified output power loss with minimum distortion.

摘要翻译： 预失真方法使用修正的线性对数模型，用于在将输入信号转换为输出信号的过程中，将具有固有幅度调制的非线性高功率放大器的输出线性化为幅度调制失真，以及将固有的幅度调制转换为相位调制失真。 复基带线性化电路在基带处提供预失真以减少频谱再生长并改善误码性能。 预失真效应与放大器失真匹配，以消除失真以提供线性化转换。 经修改的线性对数模型用于通过峰值工作点减小对具有最小失真的指定输出功率损耗的削波效应。

公开(公告)号：US06680648B2

公开(公告)日：2004-01-20

申请号：US10093681

申请日：2002-03-08

申请人： Tien M. Nguyen ,  James Yoh ,  Charles C. Wang ,  Diana M. Johnson

发明人： Tien M. Nguyen ,  James Yoh ,  Charles C. Wang ,  Diana M. Johnson

IPC分类号： H03F126

CPC分类号： H03F1/3252 ,  H03F1/3247 ,  H03F1/3294

摘要： An adaptive predistorter system receives and predistorts an input signal so as to linearize the output signal of a nonlinear high power amplifier amplifying the predistorted input signal using closed-loop feedback of the output signal in complex form at baseband so as to adaptively change the amount of the predistortion of the input signal in the presence of high power amplifier changing characteristics.

摘要翻译： 一个自适应预失真器系统接收并预失真输入信号，以使基带复合形式的输出信号的闭环反馈采用放大预失真输入信号的非线性高功率放大器的输出信号进行线性化，以便自适应地改变 在存在高功率放大器变化特性的情况下，输入信号的预失真。

公开(公告)号：US06429740B1

公开(公告)日：2002-08-06

申请号：US09533571

申请日：2000-03-23

申请人： Tien M. Nguyen ,  James Yoh ,  Andrew S. Parker ,  Diana M. Johnson

发明人： Tien M. Nguyen ,  James Yoh ,  Andrew S. Parker ,  Diana M. Johnson

IPC分类号： H03F126

CPC分类号： H03F1/3241

摘要： A predistortion method uses an extended Saleh model for linearizing the output of nonlinear high power amplifiers having inherent amplitude modulation to amplitude modulation distortion, and inherent amplitude modulation to phase modulation distortion, during conversions of an input signal to an output signal. A complex baseband linearizer provides predistortion at baseband for reducing spectral regrowth and improves bit error performance. The predistortion effects are matched to the amplifier distortions to cancel out the distortions to provide linearized conversions. The extended Saleh model provides a general solution using selected coefficients matched to distortion effects of a particular amplifier.

摘要翻译： 预失真方法使用扩展的Saleh模型，用于在将输入信号转换为输出信号的过程中将具有固有幅度调制的非线性高功率放大器的输出线性化为幅度调制失真，以及固有幅度调制到相位调制失真。 复基带线性化电路在基带处提供预失真以减少频谱再生长并改善误码性能。 预失真效应与放大器失真匹配，以消除失真以提供线性化转换。 扩展的Saleh模型提供了使用与特定放大器的失真效应匹配的所选系数的一般解决方案。