Abstract: An aspect of the invention is a signal processing method for correlation computation between received signal samples, code replica and carrier replica. The method is characterized in that the method comprises steps of: mapping (110) received signal samples into a range of unsigned integers; separating (120) bits of the mapped N-bit sample sequences into N sequences of bits; performing at least one exclusive or (XOR) operation between a sequence of bits and the code; counting (140) number of bits having value 1 in the result of the exclusive or (XOR); remapping (150) the sum back into numeric range of the received signal samples; multiplying the remapped sum by carrier replica; and accumulating (170) the product of multiplication for an interval of at least a code epoch.

Abstract: An aspect of the invention is a signal processing method for correlation computation between received signal samples, code replica and carrier replica. The method is characterized in that the method comprises steps of: mapping (110) received signal samples into a range of unsigned integers; separating (120) bits of the mapped N-bit sample sequences into N sequences of bits; performing at least one exclusive or (XOR) operation between a sequence of bits and the code; counting (140) number of bits having value 1 in the result of the exclusive or (XOR); remapping (150) the sum back into numeric range of the received signal samples; multiplying the remapped sum by carrier replica; and accumulating (170) the product of multiplication for an interval of at least a code epoch.

Abstract: An aspect of the invention is a signal processing method for correlating an N-bit received signal with an N-bit code word signal, wherein the method comprises steps of preprocessing said N-bit received signal and said N-bit code word signal, performing a Fourier transform (126) for said preprocessed signals, multiplying (130) said Fourier transformed preprocessed received signal with said Fourier transformed preprocessed code word signal, and performing inverse Fourier transform (140) to a product of said multiplication. The method is characterized in that said preprocessing comprises a step of resampling (123, 125; 135) at least one of said signals with N bits to a length of at least N+1 bits with interpolation means.