A Fast Synchronization Scheme of OFDM Signals for High-Rate Wireless LAN

Takeshi ONIZAWA  Masato MIZOGUCHI  Masahiro MORIKURA  Toshiaki TANAKA  

IEICE TRANSACTIONS on Communications   Vol.E82-B    No.2    pp.455-463
Publication Date: 1999/02/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Mobile Communication
wireless LAN,  packet transmission,  OFDM,  multi-carrier modulation,  AFC,  symbol timing detection,  carrier frequency error,  

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This paper proposes a fast synchronization scheme with a short preamble signal for high data rate wireless LAN systems using orthogonal frequency division multiplexing (OFDM). The proposed OFDM burst format for fast synchronization and the demodulator for the proposed OFDM burst format are described. The demodulator, which offers automatic frequency control and symbol timing detection, enables us to shorten the preamble length to one quarter that of a conventional one. Computer simulation results show that the degradation in required Eb/N0 due to the synchronization scheme is less than 1 dB in a selective Rayleigh fading channel.