Fast and Accurate Velocity Estimation for OFDM Systems Based on Channel Frequency Response

In this paper, we proposed a new velocity estimation algorithm for orthogonal frequency division multiplexing (OFDM) systems, which is based on the variance of channel frequency response (CFR) of two adjacent OFDM symbols. The proposed algorithm can fast and accurately estimate the velocity in both Rayleigh and Rician fading channels, and is low in computational complexity and memory storage. Simulation results show that, compared with the conventional crossingbased and covariance-based velocity estimation algorithms, the proposed algorithm can reduce estimation error by nearly 20% on average.