Acquisition for W-CDMA RAKE Receiver System

Abstract

The RAKE receiver is wildly used to conquer the signal fading in the DS/CDMA (Direct Sequence Code Division Multiple Access) system. To achieve the best performance of the RAKE receiver, an accurate code acquisition is needed in the receiver to estimate the multipath delay in the frequency selective fading environment. To obtain code acquisition, matched filter (MF) is often used. This paper presents three kinds of matched filter architecture to obtain code acquisition: Parallel type, Serial type and serial-to-parallel type. Each has its pros and cons. We choose proper serial-to-parallel type matched filter to obtain code acquisition according to the consideration of acquisition time and hardware cost.