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2005•Journal of Anhui University of Science and TechnologyRequires access

A Simplified Synchronization Algorithm Based on Cyclic Prefix for OFDM Systems

Lüxi Yang

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Abstract

Orthogonal Frequency Division Multiplexing (OFDM) is a special multi-carrier communication system, which is extremely sensitive and vulnerable to synchronization errors. Synchronization errors can lead to severe system degradation. This article proposes an OFDM synchronization algorithm based on cyclic prefix, which uses maximum-correlation criterion and normalizes the energy of received signals. This synchronization algorithm simplifies maximum-likelihood synchronization algorithm and suits to the case when SNR is unkown. The computer simulations show that this simplified synchronization algorithm has a good performance whether it is used in AWGN channels or in frequency selective Rayleigh fading channels.

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What this paper is about

Orthogonal Frequency Division Multiplexing (OFDM) is a special multi-carrier communication system, which is extremely sensitive and vulnerable to synchronization errors. Synchronization errors can lead to severe system degradation. This article proposes an OFDM synchronization algorithm based on cyclic prefix, which uses maximum-correlation criterion and normalizes the energy of received signals. This synchronization algorithm simplifies maximum-likelihood synchronization algorithm and suits to the case when SNR is unkown. The computer simulations show that this simplified synchronization algorithm has a good performance whether it is used in AWGN channels or in frequency selective Rayleigh fading channels.

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Available abstract

Orthogonal Frequency Division Multiplexing (OFDM) is a special multi-carrier communication system, which is extremely sensitive and vulnerable to synchronization errors. Synchronization errors can lead to severe system degradation. This article proposes an OFDM synchronization algorithm based on cyclic prefix, which uses maximum-correlation criterion and normalizes the energy of received signals. This synchronization algorithm simplifies maximum-likelihood synchronization algorithm and suits to the case when SNR is unkown. The computer simulations show that this simplified synchronization algorithm has a good performance whether it is used in AWGN channels or in frequency selective Rayleigh fading channels.

Key concepts: Cyclic prefix, Orthogonal frequency-division multiplexing, Synchronization (alternating current), Algorithm, Computer science, Additive white Gaussian noise, Rayleigh fading, Fading

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