Pre-processing for CSI compression

A wireless communication system, comprising:

• a User Equipment (UE) configured to:
• calculate downlink (DL) channel-related information,
• preprocess the DL channel-related information using a unitary matrix to generate post-processing information, compress the post-processing information to generate transmission data, and communicate the transmission data over a communication channel;
• and
• a Base Station configured to:
• receive the transmission data,
• decompress the received transmission data to reconstruct the post-processing information, and
• construct a DL precoder utilizing the reconstructed post-processing information, wherein:
• the preprocessing of the DL channel-related information by the UE includes modifying input matrix columns using an auxiliary synchronization vector (ASV) approach, wherein the ASV is constructed based on one of:
• a per-layer strategy to modify columns of the input matrix wherein the ASV is optimized to achieve at least one of improved DL Communication performance, improved compression, or a balance between DL communication performance and compression,
• an averaged correlation channel matrix, using the best eigenvectors of an averaged correlation matrix or best eigenvectors of a Singular Value Decomposition (SVD) of the input matrix, or
• columns of the input matrix, selected based on a predetermined strategy, or
• modifying columns using at least one of a Component Sum Approach (CSA) or a Weighted CSA (WCSA) wherein weights for the WCSA are optimized based on amplitudes of the input columns.

A wireless communication system, comprising:

• a User Equipment (UE) configured to:
• calculate downlink (DL) channel-related information,
• preprocess the DL channel-related information using a unitary matrix to generate post-processing information,
• compress the post-processing information to generate transmission data, and
• communicate the transmission data over a communication channel;
• and
• a Base Station configured to:
• receive the transmission data,
• decompress the received transmission data to reconstruct the post-processing information, and
• construct a DL precoder utilizing the reconstructed post-processing information, wherein the DL precoder incorporates interference treatment by constructing the precoder from eigenvectors of a correlation matrix of a modified channel.