公开(公告)号：US20090310649A1

公开(公告)日：2009-12-17

申请号：US12249923

申请日：2008-10-11

申请人： Teresa E. Fisher ,  Jennifer P. Rolin ,  Irina Dodoukh ,  Vernon R. Brethour ,  Mark D. Roberts ,  James Richards

发明人： Teresa E. Fisher ,  Jennifer P. Rolin ,  Irina Dodoukh ,  Vernon R. Brethour ,  Mark D. Roberts ,  James Richards

IPC分类号： H04B1/38 ,  H04B1/69

CPC分类号： H04B1/7183 ,  H04B1/7075 ,  H04B1/719 ,  H04L25/4902

摘要： An ultra wideband system employing a threshold to detect signal quality during acquisition wherein the threshold is adjusted based on signal characteristics such as packet traffic rate, packet loss rate, and packet loss fraction. In one embodiment, the threshold is adjusted by adjusting the gain of a variable gain stage ahead of the threshold. In another embodiment, gain and threshold are adjusted in a coordinated manner wherein gain is adjusted for low signal levels and threshold is adjusted for high signal levels. In one embodiment, packet traffic rate is evaluated over an interval based on maximum packet length, number of monitor packets, and inter-packet delay. In a further embodiment, multiple ramp builders are operated in parallel at multiple code offset values to generate signal statistics to compare with the threshold. Embodiments are disclosed wherein the thresholds are adaptively adjusted based on signal performance characteristics or the multipath environment.

摘要翻译： 一种采用阈值的超宽带系统，用于在采集期间检测信号质量，其中基于诸如分组业务速率，分组丢失率和分组丢失分数的信号特征来调整阈值。 在一个实施例中，通过调整在阈值之前的可变增益级的增益来调整阈值。 在另一实施例中，以协调的方式调整增益和阈值，其中针对低信号电平调整增益，并且针对高信号电平调整阈值。 在一个实施例中，基于最大分组长度，监视分组数量和分组间延迟，在一个间隔上评估分组业务速率。 在另一实施例中，多个斜坡构建器以多个码偏移值并行操作，以产生与阈值进行比较的信号统计。 公开了其中根据信号性能特征或多路径环境自适应地调整阈值的实施例。

公开(公告)号：US07436876B2

公开(公告)日：2008-10-14

申请号：US10955118

申请日：2004-09-30

申请人： Teresa E. Fisher ,  Jennifer P. Rolin ,  Irina Dodoukh ,  Vernon R. Brethour ,  Mark Roberts ,  James Richards

发明人： Teresa E. Fisher ,  Jennifer P. Rolin ,  Irina Dodoukh ,  Vernon R. Brethour ,  Mark Roberts ,  James Richards

IPC分类号： H04B1/00

CPC分类号： H04B1/7183 ,  H04B1/7075 ,  H04B1/719 ,  H04L25/4902

摘要： An ultra wideband system employing a threshold to detect signal quality during acquisition wherein the threshold is adjusted based on signal characteristics such as packet traffic rate, packet loss rate, and packet loss fraction. In one embodiment, the threshold is adjusted by adjusting the gain of a variable gain stage ahead of the threshold. In another embodiment, gain and threshold are adjusted in a coordinated manner wherein gain is adjusted for low signal levels and threshold is adjusted for high signal levels. In one embodiment, packet traffic rate is evaluated over an interval based on maximum packet length, number of monitor packets, and inter-packet delay. In a further embodiment, multiple ramp builders are operated in parallel at multiple code offset values to generate signal statistics to compare with the threshold. Embodiments are disclosed wherein the thresholds are adaptively adjusted based on signal performance characteristics or the multipath environment.

摘要翻译： 一种采用阈值的超宽带系统，用于在采集期间检测信号质量，其中基于诸如分组业务速率，分组丢失率和分组丢失分数的信号特征来调整阈值。 在一个实施例中，通过调整在阈值之前的可变增益级的增益来调整阈值。 在另一实施例中，以协调的方式调整增益和阈值，其中针对低信号电平调整增益，并且针对高信号电平调整阈值。 在一个实施例中，基于最大分组长度，监视分组数量和分组间延迟，在一个间隔上评估分组业务速率。 在另一实施例中，多个斜坡构建器以多个码偏移值并行操作，以产生与阈值进行比较的信号统计。 公开了其中根据信号性能特征或多路径环境自适应地调整阈值的实施例。