公开(公告)号：US20060098758A1

公开(公告)日：2006-05-11

申请号：US11214191

申请日：2005-08-29

申请人： Christian Luke ,  Ian Johnson ,  Mark Cope ,  Adrian Mansell ,  Steven Wood

发明人： Christian Luke ,  Ian Johnson ,  Mark Cope ,  Adrian Mansell ,  Steven Wood

IPC分类号： H04L25/49

CPC分类号： H04L27/3809

摘要： A system and method for controlling the gain in the forward signal path of a digital predistortion linearizer is disclosed. The loop gain of the predistortion system is driven to unity, where a separately controlled constant-gain observation path allows accurate gain control of the forward path. This is divided into digital gain from the predistortion function and analog gain from a Voltage Variable Attenuator (VVA) in the transmitter. The invention balances the distribution between these two domains in order to maximize dynamic range and minimize noise in the forward signal path. In order to distribute the forward path gain accurately, the characteristic of the VVA must be well known. Since these devices tend to be non-linear, with variable characteristic over temperature and batch, the invention compensates for this non-linear behavior by tracking the varying transfer characteristic of the VVA, giving a predictable local characteristic. Another aspect of the disclosed invention is the ability to operate with very low transmit power and loop gain levels, allowing accurate gain control during such scenarios as cell initialization, that require operation over a wide dynamic range.

公开(公告)号：US20060008026A1

公开(公告)日：2006-01-12

申请号：US11175509

申请日：2005-07-06

申请人： Steven Wood ,  Ian Johnson ,  Christian Luke ,  Adrian Mansell ,  Mark Cope

发明人： Steven Wood ,  Ian Johnson ,  Christian Luke ,  Adrian Mansell ,  Mark Cope

IPC分类号： H04K1/02

CPC分类号： H04L7/007 ,  H03F1/3241 ,  H04L7/0029 ,  H04L7/0062

摘要： A system and method for rapidly correcting the time difference between two signals is disclosed. In particular, a system and method for very rapidly correcting timing errors to the very high degree of accuracy required for digital predistortion adaptation is disclosed. The method is a signal processing technique, which can be performed in either hardware or software, which employs a correlation computation. The correlation results are processed in a manner that enables very rapid and accurate estimation of the time difference between the two signals.

摘要翻译： 公开了一种用于快速校正两个信号之间的时间差的系统和方法。 特别地，公开了一种用于非常快速地校正定时误差的数字预失真适应所需的非常高的准确度的系统和方法。 该方法是信号处理技术，其可以在采用相关计算的硬件或软件中执行。 相关结果以能够非常快速和准确地估计两个信号之间的时间差的方式进行处理。

公开(公告)号：US07239671B2

公开(公告)日：2007-07-03

申请号：US11175509

申请日：2005-07-06

申请人： Steven A. Wood ,  Ian Johnson ,  Christian G. Luke ,  Adrian Mansell ,  Mark Cope

发明人： Steven A. Wood ,  Ian Johnson ,  Christian G. Luke ,  Adrian Mansell ,  Mark Cope

IPC分类号： H04K1/02

CPC分类号： H04L7/007 ,  H03F1/3241 ,  H04L7/0029 ,  H04L7/0062

摘要： A system and method for rapidly correcting the time difference between two signals is disclosed. In particular, a system and method for very rapidly correcting timing errors to the very high degree of accuracy required for digital predistortion adaptation is disclosed. The method is a signal processing technique, which can be performed in either hardware or software, which employs a correlation computation. The correlation results are processed in a manner that enables very rapid and accurate estimation of the time difference between the two signals.

摘要翻译： 公开了一种用于快速校正两个信号之间的时间差的系统和方法。 特别地，公开了一种用于非常快速地校正定时误差的数字预失真适应所需的非常高的准确度的系统和方法。 该方法是信号处理技术，其可以在采用相关计算的硬件或软件中执行。 相关结果以能够非常快速和准确地估计两个信号之间的时间差的方式进行处理。

公开(公告)号：US07590190B2

公开(公告)日：2009-09-15

申请号：US11214191

申请日：2005-08-29

申请人： Christian G. Luke ,  Ian Johnson ,  Mark Cope ,  Adrian Mansell ,  Steven Andrew Wood

发明人： Christian G. Luke ,  Ian Johnson ,  Mark Cope ,  Adrian Mansell ,  Steven Andrew Wood

IPC分类号： H04K1/02

CPC分类号： H04L27/3809

摘要： A system and method for controlling the gain in the forward signal path of a digital predistortion linearizer is disclosed. The loop gain of the predistortion system is driven to unity, where a separately controlled constant-gain observation path allows accurate gain control of the forward path. This is divided into digital gain from the predistortion function and analog gain from a Voltage Variable Attenuator (VVA) in the transmitter. The invention balances the distribution between these two domains in order to maximize dynamic range and minimize noise in the forward signal path. In order to distribute the forward path gain accurately, the characteristic of the VVA must be well known. Since these devices tend to be non-linear, with variable characteristic over temperature and batch, the invention compensates for this non-linear behavior by tracking the varying transfer characteristic of the VVA, giving a predictable local characteristic. Another aspect of the disclosed invention is the ability to operate with very low transmit power and loop gain levels, allowing accurate gain control during such scenarios as cell initialization, that require operation over a wide dynamic range.

摘要翻译： 公开了一种用于控制数字预失真线性化电路的前向信号路径中的增益的系统和方法。 预失真系统的环路增益被驱动为单位，其中单独控制的恒定增益观测路径允许正向路径的精确增益控制。 这被分为来自预失真功能的数字增益和发射机中的电压可变衰减器（VVA）的模拟增益。 本发明平衡了这两个域之间的分布，以便使动态范围最大化并使正向信号路径中的噪声最小化。 为了准确地分配正向路径增益，VVA的特性必须是众所周知的。 由于这些装置倾向于非线性，具有温度和批次可变特性，本发明通过跟踪VVA的变化传递特性来补偿该非线性行为，从而给出可预测的局部特性。 所公开的发明的另一方面是以非常低的发射功率和环路增益水平进行操作的能力，从而允许在需要在宽动态范围上操作的诸如小区初始化的情况下的精确增益控制。