Apparatus and method for channel estimation using demodulation reference signal

An apparatus for channel estimation using Demodulation Reference Signal (DMRS), comprising:

• one or more processors;
• and
• memory for storing at least one program executed by the one or more processors,
• wherein the at least one program
• receives a DMRS,
• computes a Least Squares (LS) channel estimation value corresponding to the received DMRS,
• generates a time-domain channel response by performing an Inverse Discrete Fourier Transform (IDFT) on the LS channel estimation value,
• estimates noise components by setting bilateral noise windows within the time-domain channel response,
• removes noise components from the time-domain channel response by performing element-wise Minimum Mean Square Error (eMMSE) correction using the estimated noise components, and
• recovers a frequency-domain channel response by performing an N-point DFT on the corrected time-domain channel response.