公开(公告)号：US20050032485A1

公开(公告)日：2005-02-10

申请号：US10942486

申请日：2004-09-16

申请人： Thomas Bachman ,  Robert Kooker ,  Paul White ,  Paul Everline ,  Robert Snyder ,  David January ,  Leonard Sarver ,  Philip Shenenberger

发明人： Thomas Bachman ,  Robert Kooker ,  Paul White ,  Paul Everline ,  Robert Snyder ,  David January ,  Leonard Sarver ,  Philip Shenenberger

IPC分类号： H03F1/32 ,  H04B17/40 ,  H04B1/10 ,  H04K1/02 ,  H04L25/03 ,  H04L25/49

CPC分类号： H03F1/3229

摘要： A feed forward power amplifier system and method identify active channels across a frequency band to suppress unwanted intermodulation distortion (IMD) products in a communications signal such as a single- or multi-carrier communications signal. A scanning receiver identifies at least one active channel in a frequency band, and identifies at least one portion of the frequency band likely to include IMD products based upon the identified active channel(s). Based upon the identified portion of the frequency band, IMD products are suppressed from the communications signal, e.g., by controlling the magnitude and/or phase of a suppression signal mixed with the communications signal.

摘要翻译： 前馈功率放大器系统和方法识别跨频带的有源信道，以抑制诸如单载波或多载波通信信号的通信信号中的不必要的互调失真（IMD）产物。 扫描接收机识别频带中的至少一个有效信道，并且基于所识别的活动信道来识别可能包括IMD产品的频带的至少一部分。 基于所识别的频带部分，例如通过控制与通信信号混合的抑制信号的幅度和/或相位来抑制IMD产物从通信信号。

公开(公告)号：US07167693B2

公开(公告)日：2007-01-23

申请号：US10942486

申请日：2004-09-16

申请人： Thomas A. Bachman, II ,  Robert W. Kooker ,  Paul E. White ,  Paul Everline ,  Robert Snyder ,  David M. January ,  Leonard Sarver ,  Philip Shenenberger

发明人： Thomas A. Bachman, II ,  Robert W. Kooker ,  Paul E. White ,  Paul Everline ,  Robert Snyder ,  David M. January ,  Leonard Sarver ,  Philip Shenenberger

IPC分类号： H04B1/04 ,  H04B17/02 ,  H04B1/16

CPC分类号： H03F1/3229

摘要： A feed forward power amplifier system and method identify active channels across a frequency band to suppress unwanted intermodulation distortion (IMD) products in a communications signal such as a single- or multi-carrier communications signal. A scanning receiver identifies at least one active channel in a frequency band, and identifies at least one portion of the frequency band likely to include IMD products based upon the identified active channel(s). Based upon the identified portion of the frequency band, IMD products are suppressed from the communications signal, e.g., by controlling the magnitude and/or phase of a suppression signal mixed with the communications signal.

摘要翻译： 前馈功率放大器系统和方法识别跨频带的有源信道，以抑制诸如单载波或多载波通信信号的通信信号中的不必要的互调失真（IMD）产物。 扫描接收机识别频带中的至少一个有效信道，并且基于所识别的活动信道来识别可能包括IMD产品的频带的至少一部分。 基于所识别的频带部分，例如通过控制与通信信号混合的抑制信号的幅度和/或相位来抑制IMD产物从通信信号。

公开(公告)号：US06829471B2

公开(公告)日：2004-12-07

申请号：US10091756

申请日：2002-03-06

申请人： Paul E. White ,  Thomas A. Bachman, II ,  Robert W. Kooker ,  Leonard Sarver ,  Robert Snyder ,  Paul Everline

发明人： Paul E. White ,  Thomas A. Bachman, II ,  Robert W. Kooker ,  Leonard Sarver ,  Robert Snyder ,  Paul Everline

IPC分类号： H04B116

CPC分类号： H03F1/3235 ,  H04B1/123

摘要： A power amplifier system and method for locating carrier frequencies across a frequency band, identifying the modulation format of each carrier, and locating and suppressing undesired intermodulation distortion (IMD) products generated by the power amplifier. The system includes an amplifier for amplifying RF carrier signals in a main signal path, a variable phase shifter and variable attenuator on a feed forward path, and a tunable receiver that digitizes a portion of the frequency band to baseband. The tunable receiver includes a tunable voltage controlled oscillator which provides an oscillating frequency to a mixer and is phase-locked to a highly stable reference oscillator. The mixer downconverts a desired RF based on the oscillating frequency to IF. A filter passes only a selected portion of the IF signals, and the filter has a passband sufficient to discern both narrowband and wideband carriers and their associated IMD products. Based on the locations of the carrier frequencies, a processing unit determines the IMD locations of the carrier frequencies, determines the IMD locations, and adjusts the variable phase shifter and variable attenuator on the feed forward path until the IMD products in the main signal path are suppressed below a desired threshold.

摘要翻译： 一种用于定位频带上的载波频率的功率放大器系统和方法，识别每个载波的调制格式，以及定位和抑制由功率放大器产生的不期望的互调失真（IMD）产物。 该系统包括用于放大主信号路径中的RF载波信号的放大器，前馈路径上的可变移相器和可变衰减器，以及将频带的一部分数字化为基带的可调谐接收器。 可调谐接收器包括可调谐压控振荡器，其将振荡频率提供给混频器，并且被锁相到高度稳定的参考振荡器。 混频器将基于振荡频率的所需RF降频到IF。 滤波器仅通过IF信号的选定部分，并且滤波器具有足以识别窄带和宽带载波及其相关IMD产物的通带。 基于载波频率的位置，处理单元确定载波频率的IMD位置，确定IMD位置，并且调整前馈路径上的可变移相器和可变衰减器，直到主信号路径中的IMD乘积为 抑制在所需阈值以下。