Techniques improving the transmission reliablity in high-rate wireless LANs

This paper presents a frame synchronization and two frequency synchronization techniques for high-rate wireless LANs (Local Area Networks). Also, to improve the reliable communication under the multipath fading channel, we propose the wireless LAN system employing the space-time code. The proposed frame synchronization technique using the threshold checking scheme is directly based on the correlation method We then describe a coarse frequency synchronization technique combining two conventional synchronization techniques to estimate an integral frequency-offset and a frequency synchronization technique employing interpolation method to estimate the integral and fractional frequency offsets at the same time, respectively. Finally, by simulation, the Performance of the proposed techniques is evaluated(1).