Apparatus and method for estimating initial frequency offset in an asynchronous mobile communication system
First Claim
1. 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.
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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.
16 Citations
13 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5)
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6. 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:
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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. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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Specification