Terminal and base station of wireless communication system, and methods executed by terminal and base station

A base station comprising:

• a receiving unit configured to receive feedback information from a terminal, wherein the feedback information is obtained by the terminal through the following operations:
• performing a characteristic domain transformation on a channel matrix to obtain transformed channel characteristics, convolving the transformed channel characteristics to obtain convolved transformed channel characteristics, compressing the convolved transformed channel characteristics to obtain compressed channel characteristics, and taking the compressed channel characteristics as the feedback information;
• a processor configured to:
• decompress the feedback information to obtain decompressed feedback information;
• perform an inverse characteristic domain transformation on the decompressed feedback information to obtain channel state information feedback.

A method executed by a base station, comprising:

• receiving feedback information from a terminal, wherein the feedback information is obtained by the terminal through the following operations:
• performing a characteristic domain transformation on a channel matrix to obtain transformed channel characteristics, convolving the transformed channel characteristics to obtain convolved transformed channel characteristics, compressing the convolved transformed channel characteristics to obtain compressed channel characteristics, and taking the compressed channel characteristics as the feedback information;
• decompressing the feedback information to obtain decompressed feedback information;
• performing an inverse characteristic domain transformation on the decompressed feedback information to obtain channel state information feedback.