Apparatus and method for uplink transmission in wireless communication system

A terminal in a wireless communication system, the terminal comprising:

• a transceiver;
• and
• at least one processor operably coupled to the transceiver, wherein the at least one processor is configured to:
• determine a first codebook for a data signal based on a number of active terminals among a plurality of terminals including the active terminals and potentially active terminals,
• determine a second codebook for a reference signal based on the first codebook and a number of the potentially active terminals, and
• transmit at least one reference signal generated by using the second codebook and at least one data signal generated by using the first codebook.

A base station in a wireless communication system, the base station comprising:

• a transceiver;
• and
• at least one processor operably coupled to the transceiver,
• wherein the at least one processor is configured to:
• determine a first codebook for a data signal based on a number of active terminals among a plurality of terminals including the active terminals and potentially active terminals,
• determine a second codebook for a reference signal based on the first codebook and a number of the potentially active terminals, and
• receive reference signals generated by using the second codebook and data signals generated by using the first codebook.