Patent ID: 6882682

Claim:
A device for detecting a fixed pattern, said device being fed with received signals with a pattern of a length of N chips, said received signals being obtained on dividing and re-arraying each of K symbols in terms of a chip period as a unit, K being a preset positive integer, each of said symbols being spread with a spread code at a rate of M chips per symbol, M being a preset positive integer, and on repeatedly inserting into the re-arrayed symbols a signature pattern of a length K having one chip period as a unit, by M times, where N=K×M, said signature pattern being detected from said received signal, said device comprising: first-stage correlators taking correlation between M received signals spaced apart from one another by every K chips, and M spread code sequences obtained on jumping a spread code sequence of a length N by every Kth chip to output correlation values associated with K signatures, respectively; and second-stage correlators taking correlation between the correlation values associated with K signatures output by said first-stage correlators and a pre-defined signature pattern.