Host: Transdisciplinary Federation of Science and Technology
Code acquisition performance in the Direct-Sequence Code-Division Multiple-Access (DS/CDMA) communication system is strongly related to the quality of the communication systems. The performance is assessed by (i) code acquisition time; (ii) precision; and (iii) complexity for implementation. This paper discusses a low-complexity method for code acquisition and its efficiency. First, a DS/CDMA system model and properties of outputs with a passive matched-filter receiver are reviewed. Second, an error-controllable code acquisition method based on the maximum likelihood (ML) decision process is discussed. Third, a new low-complexity ML code acquisition method with a passive sign-matched filter is proposed. It is concluded that the code acquisition time with the low-complexity method is about 1.5 times longer than that with the original ML method.
