Wireless communication device and symbol-based processing method for downlink signals thereof

A non-transitory computer-readable storage medium comprising commands, wherein, when the commands are executed by a processor included in a wireless communication device, the processor detects a physical downlink shared channel (PDSCH) from a first downlink signal that is externally received,

• the processor performs a first channel estimation operation using a first reference signal for demodulating the PDSCH,
• the processor performs a second channel estimation operation on at least one second symbol between at least two first symbols included in a symbol group unit based on a result of the first channel estimation operation, each time the first channel estimation operation on the symbol group unit is completed, and
• the processor performs a demodulation operation on the PDSCH based on a result of the second channel estimation operation.