Apparatus and method for estimating initial frequency offset in an asynchronous mobile communication system
AssigneeSamsung Electronics Co., Ltd.
InventorSeong-Ho Hur
Life of this patent
Estimating the term…
Abstract
An apparatus and method for estimating an initial frequency offset in a mobile communication system in which a user equipment (UE) performs initial cell search in order to identify a Node B with which the UE can exchange data is provided. The apparatus comprises a memory for storing a plurality of pulse duration modulation (PDM) hypotheses and storing the PDM hypotheses therein; a step#1 cell searcher for performing a step#1 cell search on each of the PDM hypotheses through a primary synchronization channel and outputting the cell search result to the memory; and an initial frequency offset estimator for determining an initial frequency offset estimation value from the cell search results for the PDM hypotheses.
Claims13
A method for setting an initial frequency by a user equipment (UE) in a mobile communication system in which the UE performs an initial cell search in order to identify a Node B with which the UE can exchange data, the method comprising:
- performing a first step (step#1) cell search of a 3-step cell search for identifying the Node B on a plurality of predetermined frequency hypotheses through a primary synchronization channel;
- storing the cell search results;
- determining an initial frequency offset estimation value from the cell search results for the predetermined frequency hypotheses;
- and
- estimating a frequency offset using the determined initial frequency offset estimation value,
- wherein the predetermined frequency hypotheses are pulse duration modulation (PDM) hypotheses located at regular intervals in a loop bandwidth of an automatic frequency controller, and wherein the PDM hypotheses are PDM values.
An apparatus for setting an initial frequency in a mobile communication system in which a user equipment (UE) performs an initial cell search in order to identify a Node B with which the UE can exchange data, the apparatus comprising:
- a memory for storing a plurality of predetermined frequency hypotheses;
- a first step (step#1) cell searcher for performing a step#1 cell search of a 3-step cell search for identifying the Node B on each of the predetermined frequency hypotheses through a primary synchronization channel and outputting the cell search result to the memory;
- and
- an initial frequency offset estimator for determining an initial frequency offset estimation value from the cell search results for the predetermined frequency hypotheses,
- wherein the predetermined frequency hypothesis is pulse duration modulation (PDM) hypotheses located at regular intervals in a loop bandwidth of an automatic frequency controller, and wherein the PDM hypotheses are PDM values.
Dependencies are inferred from the claim text.