公开(公告)号：US08284860B2

公开(公告)日：2012-10-09

申请号：US12262575

申请日：2008-10-31

申请人： Bing Xu ,  Daniel B. Schwartz ,  Clive K. Tang

发明人： Bing Xu ,  Daniel B. Schwartz ,  Clive K. Tang

IPC分类号： H04L25/49 ,  H04B1/04

CPC分类号： H04B1/0475 ,  H03F1/3241 ,  H04B2001/0425

摘要： Apparatus, systems, and methods are provided for controlling the output of a transmitter using a digital error signal. A method comprises generating a digital reference signal based on a baseband input signal and converting the digital reference signal to an analog reference signal. The method further comprises generating an analog error signal in response to a difference between the analog reference signal and an analog output signal. The method further comprises generating a digital error signal from the analog error signal, and generating an input signal for the transmitter based on the baseband input signal and the digital error signal.

摘要翻译： 提供装置，系统和方法，用于使用数字误差信号来控制发射机的输出。 一种方法包括基于基带输入信号产生数字参考信号并将数字参考信号转换为模拟参考信号。 该方法还包括响应于模拟参考信号和模拟输出信号之间的差异产生模拟误差信号。 该方法还包括从模拟误差信号产生数字误差信号，并且基于基带输入信号和数字误差信号产生用于发射机的输入信号。

公开(公告)号：US20100111238A1

公开(公告)日：2010-05-06

申请号：US12262575

申请日：2008-10-31

申请人： Bing Xu ,  Daniel B. Schwartz ,  Clive K. Tang

发明人： Bing Xu ,  Daniel B. Schwartz ,  Clive K. Tang

IPC分类号： H03D1/04

CPC分类号： H04B1/0475 ,  H03F1/3241 ,  H04B2001/0425

摘要： Apparatus, systems, and methods are provided for controlling the output of a transmitter using a digital error signal. A method comprises generating a digital reference signal based on a baseband input signal and converting the digital reference signal to an analog reference signal. The method further comprises generating an analog error signal in response to a difference between the analog reference signal and an analog output signal. The method further comprises generating a digital error signal from the analog error signal, and generating an input signal for the transmitter based on the baseband input signal and the digital error signal.

摘要翻译： 提供装置，系统和方法，用于使用数字误差信号来控制发射机的输出。 一种方法包括基于基带输入信号产生数字参考信号并将数字参考信号转换为模拟参考信号。 该方法还包括响应于模拟参考信号和模拟输出信号之间的差异产生模拟误差信号。 该方法还包括从模拟误差信号产生数字误差信号，并且基于基带输入信号和数字误差信号产生用于发射机的输入信号。

公开(公告)号：US07835435B2

公开(公告)日：2010-11-16

申请号：US11970887

申请日：2008-01-08

申请人： Samir J. Soni ,  Pravin Pramakanthan ,  Clive K. Tang ,  Bing Xu

发明人： Samir J. Soni ,  Pravin Pramakanthan ,  Clive K. Tang ,  Bing Xu

IPC分类号： H04B1/66

CPC分类号： H03M7/30 ,  H04B1/66

摘要： Techniques and technologies are provided for compressing differential samples of bandwidth-limited data and coding the compressed differential samples to reduce bandwidth and power consumption when communicating bandwidth-limited data over a serial interface which couples one integrated circuit to another integrated circuit.

摘要翻译： 提供了技术和技术，用于压缩带宽限制数据的差分样本，并对压缩的差分样本进行编码，以便在将一个集成电路耦合到另一个集成电路的串行接口上​​传送带宽限制的数据时，减少带宽和功耗。

公开(公告)号：US20100048149A1

公开(公告)日：2010-02-25

申请号：US12195910

申请日：2008-08-21

申请人： Clive K. Tang ,  Bing Xu

发明人： Clive K. Tang ,  Bing Xu

IPC分类号： H04B1/04

CPC分类号： H04B1/0475 ,  H03F1/3247 ,  H03F2201/3233 ,  H04L25/06 ,  H04L27/366

摘要： A technique for performing adaptive predistortion in a transmitter includes receiving, at a first input of an error signal unit, a delayed version of a baseband input signal. The technique also includes receiving, at a second input of the error signal unit, a power amplifier feedback signal from an output of a power amplifier. An input error signal that corresponds to a difference between the delayed version of the baseband input signal and the power amplifier feedback signal is then provided at an output of the error signal unit. The input error signal is then received at an input of a signal conditioner. An adjusted error signal that has a lower direct current offset than the input error signal is provided at an output of the signal conditioner.

摘要翻译： 用于在发射机中执行自适应预失真的技术包括在误差信号单元的第一输入处接收基带输入信号的延迟版本。 该技术还包括在误差信号单元的第二输入处接收来自功率放大器的输出的功率放大器反馈信号。 然后在误差信号单元的输出处提供对应于基带输入信号的延迟版本与功率放大器反馈信号之间的差的输入误差信号。 然后在信号调节器的输入处接收输入误差信号。 在信号调节器的输出处提供具有比输入误差信号更低的直流偏移的调整误差信号。

公开(公告)号：US08412132B2

公开(公告)日：2013-04-02

申请号：US12195910

申请日：2008-08-21

申请人： Clive K. Tang ,  Bing Xu

发明人： Clive K. Tang ,  Bing Xu

IPC分类号： H04B1/04

CPC分类号： H04B1/0475 ,  H03F1/3247 ,  H03F2201/3233 ,  H04L25/06 ,  H04L27/366

摘要： A technique for performing adaptive predistortion in a transmitter includes receiving, at a first input of an error signal unit, a delayed version of a baseband input signal. The technique also includes receiving, at a second input of the error signal unit, a power amplifier feedback signal from an output of a power amplifier. An input error signal that corresponds to a difference between the delayed version of the baseband input signal and the power amplifier feedback signal is then provided at an output of the error signal unit. The input error signal is then received at an input of a signal conditioner. An adjusted error signal that has a lower direct current offset than the input error signal is provided at an output of the signal conditioner.

摘要翻译： 用于在发射机中执行自适应预失真的技术包括在误差信号单元的第一输入处接收基带输入信号的延迟版本。 该技术还包括在误差信号单元的第二输入处接收来自功率放大器的输出的功率放大器反馈信号。 然后在误差信号单元的输出处提供对应于基带输入信号的延迟版本与功率放大器反馈信号之间的差的输入误差信号。 然后在信号调节器的输入处接收输入误差信号。 在信号调节器的输出处提供具有比输入误差信号更低的直流偏移的调整误差信号。

公开(公告)号：US20090175360A1

公开(公告)日：2009-07-09

申请号：US11970887

申请日：2008-01-08

申请人： Samir J. Soni ,  Pravin Pramakanthan ,  Clive K. Tang ,  Bing Xu

发明人： Samir J. Soni ,  Pravin Pramakanthan ,  Clive K. Tang ,  Bing Xu

IPC分类号： H04B1/66

CPC分类号： H03M7/30 ,  H04B1/66

摘要： Techniques and technologies are provided for compressing differential samples of bandwidth-limited data and coding the compressed differential samples to reduce bandwidth and power consumption when communicating bandwidth-limited data over a serial interface which couples one integrated circuit to another integrated circuit.

摘要翻译： 提供了技术和技术，用于压缩带宽限制数据的差分样本，并对压缩的差分样本进行编码，以便在将一个集成电路耦合到另一个集成电路的串行接口上​​传送带宽限制的数据时，减少带宽和功耗。

公开(公告)号：US07620112B2

公开(公告)日：2009-11-17

申请号：US11291232

申请日：2005-11-30

申请人： Clive K. Tang ,  Giridhar D. Mandyam

发明人： Clive K. Tang ,  Giridhar D. Mandyam

IPC分类号： H04L27/28 ,  H04J11/00

CPC分类号： H04L1/0033 ,  H04L1/0003 ,  H04L1/0009 ,  H04L27/2639 ,  H04L27/265

摘要： A method for transmitting a signal uses a channel impulse response to determine a sub-carrier frequency function for at least two different basis functions. For each of the at least two sub-carrier frequency functions, a performance measure is predicted using the associated frequency function. These predicted performance measures are then stored and compared. One of the at least two basis functions are selected based on the comparing. A signal to be transmitted is converted from the frequency to the time domain using the selected basis function, and then transmitted over multiple sub-carriers via a time radio-frequency channel. Adaptive modulation, coding, bit and/or power loading may also be used in conjunction with the adaptive basis functions. A transmitter, modulator, and computer program are also described.

摘要翻译： 用于发送信号的方法使用信道脉冲响应来确定用于至少两个不同基函数的子载波频率函数。 对于至少两个副载波频率函数中的每一个，使用相关联的频率函数来预测性能度量。 然后存储和比较这些预测的性能测量。 基于比较来选择至少两个基本功能之一。 要使用所选择的基本功能将要发送的信号从频率转换到时域，然后经由时间射频信道在多个子载波上发送。 自适应调制，编码，位和/或功率负载也可以与自适应基函数结合使用。 还描述了发射机，调制器和计算机程序。

公开(公告)号：US07453966B2

公开(公告)日：2008-11-18

申请号：US11035297

申请日：2005-01-12

申请人： Clive K. Tang ,  Victor J. Stolpman

发明人： Clive K. Tang ,  Victor J. Stolpman

IPC分类号： H04L25/08

CPC分类号： H04L27/2608

摘要： In one aspect thereof this invention provides a method to increase data throughput in an Orthogonal Frequency Division Multiplex (OFDM) wireless communications system. The method includes modeling data throughput as a function of received Signal to Noise Ratio (SNR) with a sigmoid function to produce a throughput curve characterized as having a lower knee region and an upper knee region; and performing a gradient ascent search along the throughput curve by varying the power of a plurality of sub-carriers so as to remove power from any sub-carrier having a received SNR to the left of the lower knee region, and to re-allocate the removed power to sub-carriers having a received SNR to the right of the lower knee region.

摘要翻译： 在其一方面，本发明提供了一种增加正交频分复用（OFDM）无线通信系统中的数据吞吐量的方法。 该方法包括以S形函数建模作为接收到的信噪比（SNR）的函数的数据吞吐量，以产生特征为具有较低膝盖区域和上膝部区域的吞吐量曲线; 以及通过改变多个子载波的功率沿着吞吐量曲线执行梯度上升搜索，以便从具有接收到的SNR的任何副载波的功率从下膝盖区域的左侧移除，并重新分配 将具有接收到的SNR的子载波的功率移除到下膝部区域的右侧。

公开(公告)号：US07146171B2

公开(公告)日：2006-12-05

申请号：US10448860

申请日：2003-05-30

申请人： Clive K. Tang ,  Mohamed El-Rayes ,  Roy Thomas Derryberry ,  Giridhar Dhati Mandyam

发明人： Clive K. Tang ,  Mohamed El-Rayes ,  Roy Thomas Derryberry ,  Giridhar Dhati Mandyam

IPC分类号： H04Q7/20

CPC分类号： H04W28/18 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/16 ,  H04L1/1812 ,  H04L1/188

摘要： A method is described for transmitting data from a mobile station to a wireless network, as is a wireless communications system that operates in accordance with the method. The method includes (a) requesting permission to transmit data using an access channel; (b) in response to receiving a permission message from the wireless network, transmitting the data from the mobile station to the wireless network over a control channel using a modulation and channel coding scheme determined in the wireless network, and communicated to mobile station in the permission message; and (c) in response to receiving the transmitted data at the wireless network, soft combining the received data with previously received data, if any, until a desired decoding result is achieved, and transmitting an acknowledgment of data reception to the mobile station. The steps of transmitting and receiving preferably use a code division, multiple access technique.

摘要翻译： 描述了用于从移动台向无线网络发送数据的方法，以及根据该方法操作的无线通信系统。 该方法包括：（a）请求使用接入信道发送数据的许可; （b）响应于从无线网络接收到许可消息，使用在无线网络中确定的调制和信道编码方案，通过控制信道将数据从移动台发送到无线网络，并且在 许可信息; 以及（c）响应于在无线网络处接收到所发送的数据，将所接收的数据与先前接收到的数据进行软组合（如果有的话），直到达到期望的解码结果为止，并且向移动台发送数据接收确认。 发送和接收的步骤优选地使用码分多址技术。