RECEARCH ON ADAPTIVE PILOT PARRENT OF OFDM SYSTEM CHANNEL ESTIMATION

Channel estimation is one of the key techniques for the implement of OFDM system, and is also the hotspot of research. Nowadays, the researches on channel estimation of OFDM system mainly focus on the adaptive filtering at receiver, but little has been done at transmitter. At first, this paper theoretically analyses OFDM system model, fundamental principle of pilot design and the constraint of adaptive filtering at receiver, then proposes a new pre-processing scheme for pilot pattern. In order to improve the channel performance and transmission efficiency, the pilot pattern will be adjusted according to channel environment. In the end, simulation results and the future possible research trend are put forward.