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To Improve Bit Error Rate (BER) Of Adaptive Orthogonal Frequency Division Multiplexing (AOFDM) Systems Under Different Channels By Using Convolutional Coding


To Improve Bit Error Rate (BER) Of Adaptive Orthogonal Frequency Division  Multiplexing (AOFDM) Systems Under Different Channels By Using  Convolutional Coding
Authors : Amruta S. Dhole, Prof. Priti Subramanium
Publication Date: 04-04-2013

Authors

Author(s):  Amruta S. Dhole, Prof. Priti Subramanium

Published in:   International Journal of Engineering Research & Technology

License:  This work is licensed under a Creative Commons Attribution 4.0 International License.

Website: www.ijert.org

Volume/Issue:   Vol.2 - Issue 4 (April - 2013)

e-ISSN:   2278-0181

Abstract

Abstract-Orthogonal frequency division multiplexing (OFDM) is the physical layer in 4G wireless local area network. For efficient transmission and reception in fourth-generation wireless system, Adaptive OFDM system (AOFDM) is considered as a potential approach. In AOFDM, adaptive transmission scheme is engaged in accordance with the channel fading condition with OFDM to develop the system performance. In this paper, we have considered only adaptive modulation for OFDM system using quadrature amplitude modulation (QAM) and phase shift keying (PSK) then further we have studied the adaptive modulation of OFDM system using convolutional code, channel estimation, equalization and SNR estimation. While taking the review it shows that a significant improvements in terms of bit error rate (BER) can be achieved using the proposed AOFDM system under different channels by using convolutional coding.

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