Communication apparatus, method, program, and recording medium

A method comprising:

• performing a first channel estimation at a first frequency using a reference signal included in a spatially multiplexed and transmitted signal sequence;
• generating first weight information based on the first channel estimation;
• performing weighted synthesis processing on the signal sequence based on the first weight information;
• performing a second channel estimation at a second frequency higher than the first frequency using a reference signal included in the signal sequence subjected to the weighted synthesis processing;
• generating second weight information based on the second channel estimation;
• and
• performing demodulation processing of the signal sequence subjected to the weighted synthesis processing based on the second weight information.

A non-transitory computer readable recording medium storing a program that causes a processor to execute:

• performing a first channel estimation at a first frequency using a reference signal included in a spatially multiplexed and transmitted signal sequence;
• generating first weight information based on the first channel estimation;
• performing weighted synthesis processing on the signal sequence based on the first weight information;
• performing a second channel estimation at a second frequency higher than the first frequency using a reference signal included in the signal sequence subjected to the weighted synthesis processing;
• generating second weight information based on the second channel estimation;
• and
• performing demodulation processing of the signal sequence subjected to the weighted synthesis processing based on the second weight information.