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International Journal of

Recent Trends in Engineering

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International Journal of Recent Trends in Engineering (IJRTE)

ISSN 1797-9617

Volume 1, Number 3, May 2009

Issue on Electrical & Electronics

Page(s): 328-333

Analysis of OFDMA Downlink Frame Synchronization Method in Frequency Selective Fading Channels

K. Pushpa, Ch. Nanda Kishore and Y. Yoganandam

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Abstract

IEEE 802.16-2004 and IEEE 802.16e-2005 standards specify OFDMA as a physical layer technique for fixed and nomadic BWA systems, respectively. OFDMA is very sensitive to time and frequency offsets. In this paper, a preamble based downlink frame synchronization method for OFDMA mode of WMAN is analyzed in frequency selective fading channels. Expressions for mean and variance of the metric are derived. Dependence of the timing metric on SNR is studied by expressing mean and variance in terms of SNR. Theoretical expressions for probability of Correct, False and Miss Detections are computed. Simulations are conducted for frequency selective fading channels to validate the theoretical predictions.

Index Terms

WMAN, OFDM, OFDMA, Cell ID, frame synchronization, time synchronization, and frequency synchronization

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