Improved Channel Estimation, Improved Channel Reconstruction, and Improved Precoder Generation

A method at a Baseband Unit (BBU), the method comprising:

• transmitting, to a Radio Unit (RU), a message indicating a measurement matrix;
• receiving, from the RU, a first signal compressed by the RU based on at least the measurement matrix;
• reconstructing a channel based on at least the first signal;
• and
• transmitting, to the RU, a message indicating a precoder for beamforming, which is determined during the reconstruction of the channel.

A network node hosting a Baseband Unit (BBU), the network node comprising:

• a processor;
• a memory storing instructions which, when executed by the processor, cause the network in node to:
• transmit, to a Radio Unit (RU), a message indicating a measurement matrix;
• receive, from the RU, a first signal compressed by the RU based on at least the measurement matrix;
• reconstruct a channel based on at least the first signal;
• and
• transmit, to the RU, a message indicating a precoder for beamforming, which is determined during the reconstruction of the channel.

A method at a Radio Unit (RU), the method comprising:

• receiving, from a Baseband Unit (BBU), one or more messages indicating a measurement matrix and a precoder for beamforming;
• obtaining a second signal by using the precoder;
• determining a first signal by performing random sampling on the second signal with the measurement matrix;
• and
• transmitting, to the BBU, the first signal.