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OFDM based PHY Performance of IEEE 802.11a Using Various practical channel models

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Author(s): Narendra Giradkar | G.M.Asutkar | Abhijit Maidamwar

Journal: International Journal of Soft Computing & Engineering
ISSN 2231-2307

Volume: 1;
Issue: 4;
Start page: 92;
Date: 2011;
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Keywords: OFDM | wireless network | 802.11

ABSTRACT
Today with the advent of wireless communication and need for greater bandwidth and speed requirement with noise free reception, research has opened up a whole new market for wireless solutions. The IEEE 802.11a standards using orthogonal frequency division multiplexing (OFDM) can provide data rates up to 54 Mbps which makes good for high speed communications in wireless local area networks. In this paper, We evaluated the OFDM based PHY performance of IEEE 802.11a using various practical channel models such as Rician Fading, Rayleigh multipath Fading & AWGN. The effects of different transmission modes define in PHY on IEEE 802.11a system performance are studied using MATLAB SIMULINK. The performance is characterized in terms of 802.11a receivers bit error rates and signal to noise ratio for various modulation schemes such as 16 QAM, 64 QAM, BPSK and QPSK for different code rates as defined by the IEEE Standards 802.11a. All the Simulink models were studied using convolutional coder and Viterbi Decoder and standard OFDM format with 48 carriers, 4 pilots and a zero insertion in the middle.
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