Research of OFDM Systems Channel Estimation Based on DFT Improved Algorithm

Based on the training sequence in the DFT channel estimation method, the further research on the LS and MMSE channel estimation algorithm of OFDM systems is proceeding. To use of the characteristics that signal energy concentrated on time domain improves channel estimation algorithm. Only in the time the trails energy concentrated, the lower energy trail is approximate to zero, so algorithm complexity can be greatly reduced. Simulation result shows that the improved algorithm can not only effectively reduce the calculation amount of channel estimation algorithm, but also calculation accuracy of low SNR is better than original estimates.