公开(公告)号：US20070274279A1

公开(公告)日：2007-11-29

申请号：US11639753

申请日：2006-12-15

申请人： Steven Wood ,  Matthew Hunton ,  Christian Luke ,  Simon Whittle ,  David Porte ,  Anthony Demarco

发明人： Steven Wood ,  Matthew Hunton ,  Christian Luke ,  Simon Whittle ,  David Porte ,  Anthony Demarco

IPC分类号： H04J1/00

CPC分类号： H04W88/10 ,  H04W88/085

摘要： A communication system implements a method of bidirectional communication of signals to/from one or more wireless transmit locations. Transmitting signals to one or more wireless transmit locations includes obtaining a plurality of signals having different protocols, from a plurality of base stations, then converting the plurality of signals into common digital network protocol signals, and transmitting the common protocol signals over a transmission network to one or more wireless transmit locations. Receiving signals from one or more wireless transmit locations includes transmitting digital signals using a common protocol, from one or more wireless receive locations over the transmission network, converting the received digital signals into a plurality of signals having different protocols corresponding to a plurality of base stations implementing said different protocols, and providing the plurality of differing protocol signals to said corresponding plurality of base stations.

摘要翻译： 通信系统实现了向/从一个或多个无线发射位置的信号的双向通信的方法。 将信号发送到一个或多个无线发射位置包括从多个基站获得具有不同协议的多个信号，然后将多个信号转换成公共数字网络协议信号，以及通过传输网络将公共协议信号发送到 一个或多个无线发射位置。 从一个或多个无线发射位置接收信号包括使用公共协议从传输网络上的一个或多个无线接收位置发送数字信号，将接收到的数字信号转换成具有与多个基站对应的不同协议的多个信号 实现所述不同的协议，并向所述对应的多个基站提供多个不同的协议信号。

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：US20060008030A1

公开(公告)日：2006-01-12

申请号：US11175508

申请日：2005-07-06

申请人： Christian Luke ,  Ian Johnson ,  Steven Wood

发明人： Christian Luke ,  Ian Johnson ,  Steven Wood

IPC分类号： H04L27/36

CPC分类号： H04L27/364 ,  H04L7/0029 ,  H04L7/007 ,  H04L7/0091

摘要： A system and method for compensating for the time delay between the in-phase I and the quadrature Q paths of a digitally modulated transmitter incorporating an analog quadrature modulator is disclosed. The time delay between the in-phase I and the quadrature Q paths is computed and used to calibrate a set of interpolation filters in the forward path that compensate for this delay, reducing the frequency dependent degradation in performance of the analog quadrature modulator. The disclosed system and method provides improved compensation of gain, phase and DC offsets in the analog quadrature modulator over a broader bandwidth. Fractional delay interpolation filters may be used to estimate the delay between the in-phase and quadrature paths. This eliminates the need for a factory calibration procedure, speeding up manufacture and reducing costs.

摘要翻译： 公开了一种用于补偿包含模拟正交调制器的数字调制发射机的同相I和正交Q路径之间的时间延迟的系统和方法。 计算同相I和正交Q路径之间的时间延迟，并用于校准正向通路中的一组补偿该延迟的内插滤波器，从而减少模拟正交调制器性能的频率依赖性降低。 所公开的系统和方法在更宽的带宽上提供模拟正交调制器中的增益，相位和DC偏移的改进的补偿。 分数延迟插值滤波器可以用于估计同相和正交路径之间的延迟。 这消除了对工厂校准程序的需求，加速制造和降低成本。

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。