Performance Elevation Criteria for OFDM under AWGN Fading Channel using IEEE 802.11a
Abhishek Katariya1, Amita Yadav2, Neha Jain3

1Abhishek Kataria, Department of Electronics & Communication, SBCET/ Jaipur, India.
2Amita Yadav, Department of Electronics & Communication, SBCET /Jaipur, India.
3Neha Jain, Department of Electronics & Communication, SBCET /Jaipur, India.
Manuscript received on May 20, 2011. | Revised Manuscript received on June 10, 2011. | Manuscript published on July 05, 2011. | PP: 10-13 | Volume-1 Issue-3, July 2011. | Retrieval Number: C042051311
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Abstract: In this paper, the BER performance of OFDM-BPSK 16 –QAM and 64–QAM system over AWGN fading channel has been reported. Orthogonal Frequency Division Multiplexing (OFDM) is a key technique for achieving high data rates and spectral efficiency requirements for wireless communication systems. However in fading environments the bit error rate (BER) increases. The performance can be improved by using some kind of channel coding. This form of OFDM is called coded-OFDM (COFDM). This paper presents a modeling and simulation of OFDM based on IEEE 802.11a standard. The flexibility of this model is because fading parameters compared to only one in AWGN fading model, which helps to analyze the severity of fading more deeply and this model is versatile enough to represent fading. Finally simulations of OFDM signals are carried with AWGN faded signal to understand the effect of channel fading .The performance of OFDM is compared in terms of BER vs SNR for different modulation formats.
Keywords: BER, OFDM Additive white Gaussian noise (AWGN), BPSK ,QAM.