Patent ID: 6891884
Filing Date: 2005-05-10
Classification: H04B

Abstract:
1. An apparatus for detecting a correlation of samples with a spread code, said samples being obtained by sampling a spectrum spread signal in a range of one symbol period with a oversampling rate which is N-fold of a chip rate, wherein N is an integer larger than zero, said spread code being of L×M period per symbol, wherein L and M are integers larger than one, said spectrum spread signal having been spread in spectrum by said spread code signal, said apparatus comprising: an L-chip accumulator which inputs said samples to generate and output an intermediate correlation signal; M memories, each of which stores L×M samples of said intermediate correlation signal; an adder which has M input terminals and inputs from each of said input terminals one of said intermediate correlation signal which is outputted from said L-chip accumulator and said intermediate correlation signal which is outputted from a corresponding memory among said memories; and a controller which controls the supply of said intermediate correlation signal outputted from said L-chip accumulator to said M memories and to said M input terminals of said adder in rotation with a unit of L×N samples, and controls the supply to each of said input terminals of said adder, said intermediate correlation signal which has been stored in each of said memories M−1 times; wherein an output of said adder is outputted as an correlation signal outputted from the apparatus.