Performance of Decision Feedback Equalizer over Frequency Selective Fading Channel in W-CDMA Systems
B.Praveen Kumar1, D.Vishnu Vardhan2
1B.Praveen Kumar, Electronics and Communication Engineering, Jawaharlal Nehru Technological University-Anantapur/JNTUA College of engineering–Pulivendula, Kadapa, INDIA.
2D.Vishnu Vardhan, Electronics and Communication Engineering, Jawaharlal Nehru Technological University-Anantapur/JNTUA College of engineering–Pulivendula, Kadapa, INDIA.
Manuscript received on December 12, 2013. | Revised Manuscript Received on December 15, 2013. | Manuscript published on December 18, 2013. | PP: 10-13 | Volume-1, Issue-1, December 2013. | Retrieval Number: A0112111113
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© The Authors. Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
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.