Preamble-aided time delay estimation in frequency selective channels for wireless OFDM systems

Abstract

In this Letter, an improved method for estimating the time delay in preamble-aided orthogonal frequency division multiplexing systems is presented. It uses a conventional preamble structure and combines cross-correlation techniques to achieve estimations of time delay and the number of multipaths without any additional overhead. Computer simulations results show that the proposed method is of near-ideal property in frequency-selected channels.

Keywords

• delay estimation
• OFDM modulation
• wireless channels
• preamble-aided time delay estimation
• frequency selective channel
• wireless OFDM systems
• preamble-aided orthogonal frequency division multiplexing systems
• preamble structure
• cross-correlation technique
• multipath number
• computer simulation