Wireless communication apparatus and operating method thereof

A first wireless communication apparatus, comprising:

• processing circuitry configured to,
• calculate noise-whitened channel estimation values by performing phase correction on a pilot signal based on a reference pilot signal, the pilot signal being received from a second wireless communication apparatus over a communication channel, the noise-whitened channel estimation values corresponding to the communication channel,
• calculate channel-smoothed channel estimation values by applying a channel smoothing filter to the noise-whitened channel estimation values, and
• calculate final channel estimation values by inversely applying the channel smoothing filter and a noise whitening filter to the channel-smoothed channel estimation values.

An operating method of a wireless communication apparatus, the method comprising:

• calculating initial channel estimation values based on a reference pilot signal and a pilot signal, the pilot signal being received over a communication channel;
• calculating noise-whitened channel estimation values by applying a noise whitening filter to the initial channel estimation values;
• calculating channel-smoothed channel estimation values by applying a channel smoothing filter to the noise-whitened channel estimation values;
• and
• calculating final channel estimation values by inversely applying the channel smoothing filter and the noise whitening filter to the channel-smoothed channel estimation values.