Study on MMSE-DFT Based Channel Estimation for HAPS OFDM System

The channel estimation is needed to enhance performance of HAPS. Channel estimation is essential in wireless communication, channel estimation can be used to minimize the possibility of bit errors received at the receiver. This paper will discuss HAPS channel estimation in Orthogonal Frequency Division Multiplexing (OFDM). The estimation methods used include Least Square (LS), Minimum Mean Square Error (MMSE) and Minimum Mean Square Error with Discrete Fourier Transform (MMSE-DFT) to determine the characteristics of each method on the Rician channel. According to the simulation results with the Mean Square Error (MSE) parameter, the channel estimation method with MMSE-DFT gives better performance than the ideal MMSE.