Superimposed pilot based channel estimation and tracking in OFDM system

The conventional pilot-symbol assisted modulation(PSAM)consumes valuable bandwidth,but the superimposed pilot scheme doesn't require dedicated slots for training.This paper proposes a new channel tracking method based on the superimposed pilot.After channel estimation by superimposing an optimal PAPR pilot,it uses a periodic pilot for channel tracking.The method can save valuable resources and decrease the complexity.