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Abstract
Orthogonal Frequency Division Multiplexing (OFDM) systems are highly sensitive to frequency synchronization errors which cause inter-carrier interference, leading to degradation in the system performance. In this paper, a pragmatic timing and frequency synchronization scheme for reuse-I OFDMA systems that is compatible with IEEE 802.16d/e wireless MAN standard is proposed. The algorithm uses cyclic prefix correlation technique for estimating and tracking the OFDMA frame boundary and fractional frequency offset. Once the preamble is captured, the integral part of the frequency offset and cell-specific preamble code can be estimated. This novel scheme is computationally efficient and robust to co-channel interference and multipath fading. Simulation results show that the proposed algorithm gives excellent performance even at very low signal to interference noise ratios.
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Notes on contributors
Y Bhargava
Y Bhargava received BE degree in Electronics and Communications Engineering from University College of Engineering, Osmania University, Hyderabad, India and MTech degree in communications systems from the Indian Institute of Technology, Madras, India. He is currently working as Engineer in SOC IP division at Ittiam Systems Private Limited, Bangalore, India. His interests include signal processing and wireless communications.
K Giridhar
K Giridhar is a Professor at the Indian Institute of Technology Madras, Chennai. He studied BSc (Applied Sciences) at PSG College of Technology, Coimbatore, ME (Electrical Communications) at Indian Institute of Science, Bangalore, and received a PhD (Electrical Engineering) from University of California, Santa Barbara. Between 1989–90, he was a member of research staff at Bharat Electronics, Bangalore, and between 1993–94, was a research affiliate in Electrical Engineering at Stanford University, California. Since 1994, he has been with the Department of Electrical Engineering at IIT Madras.
He has been a consultant to many telecom companies in India, and has been a visiting faculty at Sri Sathya Sai Institute of Higher Learning, Prasanthi Nilayam, Andhra Pradesh, and at Stanford University, California.