| Paper: | SPCOM-P5.5 | ||
| Session: | Synchronization | ||
| Time: | Wednesday, May 17, 10:00 - 12:00 | ||
| Presentation: | Poster | ||
| Topic: | Signal Processing for Communication: Acquisition, synchronization and tracking | ||
| Title: | A Novel Synchronization Scheme for OFDM Over Fading Channels | ||
| Authors: | Si Ai, Shu-Hung Leung, Chi-Sing Leung, City University of Hong Kong, Hong Kong SAR of China | ||
| Abstract: | This paper presents a novel preamble-based synchronization scheme for orthogonal frequency division multiplexing systems over time-variant multipath fading channels. A new timing metric is derived with the use of a local synchronizing sequence (LSS). We propose one specifically designed training sequence which consists of two segments of equal length where each segment is constructed from a different pseudo-noise (PN) sequence. The advantages of using the LSS are twofold: multipath effects are reduced in the new metric and the timing metric trajectory is impulse-like. The new algorithm is shown to provide excellent performance in timing estimation even in severe time-variant fading channels. As for frequency synchronization, a two-step approach handles both fractional and integer frequency offset providing a large frequency acquisition range without loss of estimation accuracy. | ||
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