DFE FOR CDMA SYSTEMS OVER FADING CHANNEL USING QPSK SIGNALING SCHEME

Author’s Name : Dr V Thrimurthulu | B Praveen Kumar | L Mihira Priya

Volume 01 Issue 03  Year 2014  ISSN No:  2349-252X  Page no: 1-5

Abstract -The CDMA systems provide the greater capacity in wireless communication environment. But a major obstacle for this is multipath fading which causes inter symbol interference (ISI). The conventional sub optimum receiver consisting of a bank of matched filters is often inefficient because interference is treated as noise. The device used to combat with ISI is named as equalizer. Among linear and non linear equalizers, non linear equalizer outperforms over linear equalizers. Here decision feedback equalizer is non linear equalizer. This paper considers a non linear equalizer such as decision feedback equalizer (DFE) to mitigate inter symbol interference (ISI) in code division multiple access (CDMA) systems.

Keywords –Feed-forward and feedback filters, linear adaptive transversal equalizer (LTE), zero-forcing equalizer, direct sequence code division multiple access (DS-CDMA), and correlation