Overlay Transmission System on Wireless LAN with RTS/CTS Exchange Taking into Account Timing Synchronization

Kilsoo JEONG  Kazuto YANO  Satoshi TSUKAMOTO  Makoto TAROMARU  

IEICE TRANSACTIONS on Communications   Vol.E93-B   No.3   pp.640-649
Publication Date: 2010/03/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.640
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
overlay transmission,  timing synchronization,  tapped delay line adaptive array antenna,  wireless LAN,  

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This paper proposes a new overlay transmission system for wireless LAN with RTS/CTS exchange. Conventional timing synchronization schemes may fail in the presence of inter-system interference, because they have not been designed for overlay transmission. In the proposed system, a transmitter estimates the transmission timing of the next wireless LAN DATA frame, and then sends its DATA frame at almost the same time as the estimated transmission timing to easily establish timing synchronization at the receiver. Moreover, we employ a tapped delay line adaptive array antenna at both transmitter and receiver to effectively suppress interference due to overlay transmission in a rich multipath propagation environment. The frame error rate performances of the proposed system and the IEEE 802.11a wireless LAN are evaluated through computer simulations that assume an exponentially decaying 8-path non-line-of-sight fading channel and include a timing synchronization process. Simulation results demonstrate that the proposed system can achieve overlay transmission while avoiding interference in a rich multipath propagation environment.