Apparatus and method for supporting multiple access in wireless communication system

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

• receiving first reference signals through a first resource that supports an orthogonal multiple access with a plurality of terminals;
• receiving second reference signals through a second resource that supports a non-orthogonal multiple access (NOMA) with the plurality of terminals;
• and
• receiving data signals from the plurality of terminals according to the NOMA,
• generating a signature matrix based on the second reference signals,
• generating joint channel based on the signature matrix,
• wherein the second reference signals include at least one sequence that is determined based on the first reference signals, and
• wherein the second reference signals are used to generate joint channel information based on a signature matrix for the plurality of terminals of the NOMA.

An apparatus of a base station in a wireless communication system, the apparatus comprising:

• a transceiver configured to receive a signal;
• and
• at least one processor operatively coupled to the transceiver,
• wherein the at least one processor is configured to:
• receive first reference signals through a first resource that supports an orthogonal multiple access with a plurality of terminals,
• receive second reference signals through a second resource that supports a non-orthogonal multiple access (NOMA) with the plurality of terminals, and
• receive data signals from the plurality of terminals according to the NOMA,
• generate a signature matrix based on the second reference, and
• generate joint channel based on the signature matrix, and
• wherein the second reference signals include at least one sequence that is determined based on the first reference signals, and
• wherein the second reference signals are used to generate joint channel information based on a signature matrix for the plurality of terminals of the NOMA.