Patent ID: 7424049
Filing Date: 2008-09-09
Classification: H04B

Abstract:
1. A communications acquisition method, which comprises: correlating a received binary-coded spread sequence with a frequency f and having m bits with a locally generated spread sequence by phase-shifting a multiplicity of locally generated spread sequences with respect to the received spread sequence; storing the received spread sequence and processing the stored, received spread sequence at an oversampling rate of i*f, where i is an integer; splitting the stored, received spread sequence into i sections and carrying out the correlation in i steps; shifting the received spread sequence bit by bit within k cycles in k section variants each having m bits at an oversampling rate of k*f, where k is an integer, by shifting a most significant bit of a section variant to a position of a least significant bit of a succeeding section variant; after k cycles, replacing the least significant bit by a succeeding bit of the received spread sequence and repeating the shifting and replacing steps m−1 times; subdividing the locally generated spread sequence into k sections each having n bits, where n is an integer, and comparing each of these sections with a section variant of the received spread sequence within a cycle; counting all matches and storing the count results; and carrying out a maximum search over all the count results.