Delay-Doppler search for matching pursuit algorithms in time-variant channels

The development of wireless communications created broad opportunities in mobile communications. However, poor channel estimation and lack of proper Doppler shift compensation techniques limit the mobility considerably. Therefore, a high quality and low-complexity channel estimation is one of the most important conditions for high mobility. In this paper we propose a low-complexity delay-Doppler search (DDS) for matching pursuit algorithms. The proposed search algorithm can be applied to MP algorithms which estimates the delay and the Doppler features of the channel in two dimensions efficiently. Two dimensional approach lowers the complexity significantly. At the end we show results for the DVB-T2 systems.