Pilot Interpolation Based Channel Estimation for LTE Systems

Abstract In this paper, we present a framework for channel estimation in long term evolution (LTE) system. Pilot symbols are spread over the entire time-frequency grid of transmit super frame with consideration of delay-doppler spread of the transmitting medium. At the receiver, we use various interpolation techniques like linear, piece-wise cubic and spline to estimate the channel at non-pilot locations for different antenna configurations. Estimation error is measured using mean squared error (MSE) between the ideal channel and estimated channel for different interpolation techniques. Simulation result shows the channel estimation MSE for single as well as for multiple-input multiple-output (MIMO) link as a function of signal-to-noise ratio.