Method for establishing a communication link
First Claim
1. A user equipment (UE) for establishing a communication link comprising:
- a first module for processing a received communication signal and generating an index value associated with a primary synchronization code within said communication signal, said first module comprising;
a splitter for splitting a sampled communication signal into even and odd samples;
a Hierarchical Golay Correlator (HGC) for correlating the even and odd samples with a primary synchronization code of the communication signal, and for generating complex values of the even and odd samples;
an absolute value modifier (AVM) for approximating signal strength values for each of the even and odd samples;
a decision circuit for accumulating the approximate signal strength values of the samples within a frame of the communication signal, assigning as an index value a highest accumulated signal strength value, and for determining a chip offset based on said index value;
a normalizer circuit for normalizing the accumulated signal strength value;
a look-up table for determining a gain factor;
a multiplier for generating a noise threshold based on the normalized signal strength value and on the gain factor; and
a comparator for comparing the noise threshold to the index value in order to make a first decision;
a second module for generating a scrambling code group number, a slot offset, and secondary synchronization code based on output provided by the first module;
a third module for retrieving a primary scrambling code based on the scrambling code group number and slot offset; and
a controller coupled to said first module, second module, and third module for controlling a search frequency of the UE for establishing a communication link.
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Abstract
A user equipment (UE) for establishing a communication link comprising a first module for processing a received communication signal and generating an index value associated with a primary synchronization code within said communication signal; a second module for generating a scrambling code group number, a slot offset, and secondary synchronization code based on output provided by the first module; a third module for retrieving a primary scrambling code based on the scrambling code group number and slot offset; and a controller coupled to said first module, second module, and third module for controlling an a search frequency of the UE for establishing a communication link.
30 Citations
4 Claims
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1. A user equipment (UE) for establishing a communication link comprising:
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a first module for processing a received communication signal and generating an index value associated with a primary synchronization code within said communication signal, said first module comprising;
a splitter for splitting a sampled communication signal into even and odd samples;
a Hierarchical Golay Correlator (HGC) for correlating the even and odd samples with a primary synchronization code of the communication signal, and for generating complex values of the even and odd samples;
an absolute value modifier (AVM) for approximating signal strength values for each of the even and odd samples;
a decision circuit for accumulating the approximate signal strength values of the samples within a frame of the communication signal, assigning as an index value a highest accumulated signal strength value, and for determining a chip offset based on said index value;
a normalizer circuit for normalizing the accumulated signal strength value;
a look-up table for determining a gain factor;
a multiplier for generating a noise threshold based on the normalized signal strength value and on the gain factor; and
a comparator for comparing the noise threshold to the index value in order to make a first decision;
a second module for generating a scrambling code group number, a slot offset, and secondary synchronization code based on output provided by the first module;
a third module for retrieving a primary scrambling code based on the scrambling code group number and slot offset; and
a controller coupled to said first module, second module, and third module for controlling a search frequency of the UE for establishing a communication link. - View Dependent Claims (2, 3)
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4. A method of generating an index value associated with a primary synchronization code within a communication signal, said method comprising:
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splitting a sampled communication signal into even and odd samples;
correlating the even and odd samples with a primary synchronization code of the communication signal;
generating complex values of the even and odd samples;
approximating signal strength values for the even and odd samples;
accumulating the approximate signal strength values within a frame of the communication signal; and
assigning as an index value a highest accumulated signal strength value.
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Specification