Apparatus and method for searching preamble signal based on small search window
First Claim
1. A small window preamble searcher for searching a preamble signal of a mobile station in a small search window, comprising:
- engine start point control means for generating and controlling a search start point in the small search window;
a plurality of spreading code generation means each for generating an spreading code at the search start point transmitted from said engine start point control means;
a plurality of accumulation means each for despreading the spreading code generated from said spreading code generation means and a received signal inputted in a certain time and for coherently accumulating despreaded spreading code, thereby generating a coherently accumulated signal;
unit symbol storing means for storing the coherently accumulated signal;
conversion means for consecutively converting the accumulated signal from said unit symbol storing means, thereby generating a converted signal; and
path arranging means for non-coherently accumulating the converted signal from said conversion means and arranging accumulated results.
1 Assignment
0 Petitions
Accused Products
Abstract
An apparatus and method of searching a preamble signal in a search window for reducing a chip size of a preamble searcher in a transceiver of a base station is enclosed. By using a plurality of small window preamble searchers searching the preamble signal in a small search window, which is a division of a large search windows of a conventional preamble searcher divided by search start times, the preamble searcher of the entire search window can be implemented and the size of semiconductor chip is reduced by implementing distributing small preamble searcher in a small semiconductor chips.
20 Citations
9 Claims
-
1. A small window preamble searcher for searching a preamble signal of a mobile station in a small search window, comprising:
-
engine start point control means for generating and controlling a search start point in the small search window;
a plurality of spreading code generation means each for generating an spreading code at the search start point transmitted from said engine start point control means;
a plurality of accumulation means each for despreading the spreading code generated from said spreading code generation means and a received signal inputted in a certain time and for coherently accumulating despreaded spreading code, thereby generating a coherently accumulated signal;
unit symbol storing means for storing the coherently accumulated signal;
conversion means for consecutively converting the accumulated signal from said unit symbol storing means, thereby generating a converted signal; and
path arranging means for non-coherently accumulating the converted signal from said conversion means and arranging accumulated results. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method for searching a preamble signal in a small window preamble searcher, comprising the steps of:
-
a) transmitting a search start point in the small search window, which represents an accumulation start time of an engine of the small window preamble searcher is received from the processor, to the engine;
b) despreading a spreading code transmitted from a spreading code generator and a received signal from a RF analog/baseband digital converter according to the search start point, accumulating the despreaded spreading code and the received signal during a certain time in coherent, and thereby generating a coherently accumulated signal; and
c) performing consecutively a hadamard transformation of the coherently accumulated signal, outputting the transformed accumulated signal, accumulating again non-coherently the coherently accumulated signal according to a signature, determining a path offset having the strongest energy in each signature and transmitting the path offset having the strongest energy to the processor.
-
Specification