公开(公告)号：US20130003880A1

公开(公告)日：2013-01-03

申请号：US13170930

申请日：2011-06-28

申请人： Guoqiang Lu ,  Oskar Mauritz ,  Fredrik Huss ,  Henrik Back

发明人： Guoqiang Lu ,  Oskar Mauritz ,  Fredrik Huss ,  Henrik Back

IPC分类号： H04L27/00

CPC分类号： H04W56/0035 ,  H04J11/0079 ,  H04J2011/0096 ,  H04L27/2657 ,  H04L27/2686 ,  H04W24/08 ,  H04W56/001

摘要： A method and apparatus for frequency offset estimation exploits the differences in reference symbol timing for different channels to resolve ambiguities in the frequency offset estimation. Based on the initial frequency offset estimates, a hypothesis table is constructed providing hypothesized frequency offsets for each channel for a plurality of possible offset regions. An error metric for each offset region is calculated based on the difference of the hypothesized frequency offsets. The set of hypothesized frequency offsets that minimize the error metric is selected as the final frequency offset estimates.

公开(公告)号：US20090213998A1

公开(公告)日：2009-08-27

申请号：US12091314

申请日：2005-10-27

申请人： Stefan Allevad ,  Per Odling ,  Antoni Fertner ,  Henrik Back ,  Fredrik Lindqvist ,  Per Ola Borjesson ,  Jaume Rius i Riu

发明人： Stefan Allevad ,  Per Odling ,  Antoni Fertner ,  Henrik Back ,  Fredrik Lindqvist ,  Per Ola Borjesson ,  Jaume Rius i Riu

IPC分类号： H04M3/22

CPC分类号： H04B3/46

摘要： A method and device for estimating one or more transmission properties of a telecommunication transmission line. At least one signal is sent on the line, the at least one signal including at least two frequencies for which the absolute value of the line propagation constant times the line length is less than π, and a resulting signal is received. An estimate of at least one transmission line property is then determined by examining the relationship between the sent and resulting signal or signals. The process may be repeated, if necessary. The estimate determination may also be repeated one or more times, with each successive estimate preferably using for the determination only those frequencies for which, as previously estimated, the absolute value of the line propagation constant times the line length is less than π.

摘要翻译： 一种用于估计电信传输线的一个或多个传输特性的方法和装置。 在线上发送至少一个信号，所述至少一个信号包括线路传播常数的绝对值乘以线长度的至少两个频率小于pi，并且接收到所得到的信号。 然后，通过检查所发送和产生的信号或信号之间的关系来确定至少一个传输线属性的估计。 如果需要，可以重复该过程。 估计确定也可以重复一次或多次，其中每个连续估计优选地仅用于确定如前所述的线路传播常数的绝对值乘以线长度的频率小于pi的那些频率。

公开(公告)号：US08605799B2

公开(公告)日：2013-12-10

申请号：US13170930

申请日：2011-06-28

申请人： Guoqiang Lu ,  Oskar Mauritz ,  Fredrik Huss ,  Henrik Back

发明人： Guoqiang Lu ,  Oskar Mauritz ,  Fredrik Huss ,  Henrik Back

IPC分类号： H04L25/00 ,  H04L7/00

CPC分类号： H04W56/0035 ,  H04J11/0079 ,  H04J2011/0096 ,  H04L27/2657 ,  H04L27/2686 ,  H04W24/08 ,  H04W56/001

摘要： A method and apparatus for frequency offset estimation exploits the differences in reference symbol timing for different channels to resolve ambiguities in the frequency offset estimation. Based on the initial frequency offset estimates, a hypothesis table is constructed providing hypothesized frequency offsets for each channel for a plurality of possible offset regions. An error metric for each offset region is calculated based on the difference of the hypothesized frequency offsets. The set of hypothesized frequency offsets that minimize the error metric is selected as the final frequency offset estimates.

公开(公告)号：US08290122B2

公开(公告)日：2012-10-16

申请号：US12091314

申请日：2005-10-27

申请人： Stefan Allevad ,  Per Ödling ,  Antoni Fertner ,  Henrik Back ,  Fredrik Lindqvist ,  Per Ola Börjesson ,  Jaume Rius i Riu

发明人： Stefan Allevad ,  Per Ödling ,  Antoni Fertner ,  Henrik Back ,  Fredrik Lindqvist ,  Per Ola Börjesson ,  Jaume Rius i Riu

IPC分类号： H04M1/24 ,  H04M3/08 ,  H04M3/22

CPC分类号： H04B3/46

摘要： A method and device for estimating one or more transmission properties of a telecommunication transmission line. At least one signal is sent on the line, the at least one signal including at least two frequencies for which the absolute value of the line propagation constant times the line length is less than π, and a resulting signal is received. An estimate of at least one transmission line property is then determined by examining the relationship between the sent and resulting signal or signals. The process may be repeated, if necessary. The estimate determination may also be repeated one or more times, with each successive estimate preferably using for the determination only those frequencies for which, as previously estimated, the absolute value of the line propagation constant times the line length is less than π.

摘要翻译： 一种用于估计电信传输线的一个或多个传输特性的方法和装置。 在该线上发送至少一个信号，所述至少一个信号包括线路传播常数的绝对值乘以线路长度的至少两个频率小于＆pgr，并且接收到所得到的信号。 然后，通过检查所发送和产生的信号或信号之间的关系来确定至少一个传输线属性的估计。 如果需要，可以重复该过程。 估计确定也可以重复一次或多次，其中优选地使用每个连续估计仅用于确定如前所述的线路传播常数的绝对值乘以线长度的频率小于＆pgr的那些频率。