An improved DFT-based channel estimation method for OFDM system

In the OFDM system, channel estimation is significant in that it affects the reliability of coherent detection at the receiver side. DFT-based channel estimation method is suitable for sparse channel estimation due to sparsity means low computational complexity. Combined with exponential smoothing, an improved DFT-Based channel estimation method is proposed in order to suppress noise. The noise suppression capacity of exponential smoothing is analyzed in theory. Simulation results indicate that the improved method is superior to DFT-based method at a cost of low additional computational complexity.