Telefonaktiebolaget Lm Ericsson (publ)

Henrik Back

Fredrik Huss

Oskar Mauritz

Guoqiang Lu

Fredrik Lindqvist

Antoni Fertner

Per Ola Börjesson

Jaume Rius I Riu

Per Ödling

Stefan Allevad

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.

Estimation of frequency offset between a base station and mobile terminal

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 &#x3c0;, 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 &#x3c0;.

Method and device for estimating properties of a telecommunication transmission line

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Vendelsö, Sweden

Henrik Back