Wi-Fi in high-speed transport communications
Zhipeng Zhao · 2009
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.