Wi-Fi in high-speed transport communications

We discuss in this paper the performance of the present Wi-Fi system in a high-speed environment where Doppler effect is taken into account. The performance is reported in both 802.11a and its future MIMO version 802.11n. Simulations are taken in use of Jakes´ model in diffe¿rents speeds contexts and WiFi system is found weak facing Doppler effect. In order to reduce the Doppler impact, we present a feasible and easy channel coefficients estimation processing towards a more robust system in high-speed utilization. A pilots-based tracking method is also proposed by interpolation in frequency domain to update the channel state information.