Implementation of CDMA receiver using Recursive Digital Matched Filter

Code Division Multiple Access (CDMA) is a multiple access technique widely used in cellular and military communication systems. In Direct Sequence Spread Spectrum (DSSS) communications, data samples are embedded inside Pseudo Noise code (PN code) prior to transmission. Synchronization of this unique code with the incoming data samples forms an important step in data recovery. Single Dwell Serial Search (SDSS) and Matched Filtering are some of types of the CDMA code synchronization techniques. This paper presents design and implementation of Recursive Digital Matched Filter (RDMF) for code synchronization in CDMA. From design summary, it is observed that with RDMF, lesser hardware is utilized compared to the conventional methods. And also, a modification in despreading steps is proposed for achieving reduced Bit Error Rate (BER) performance