Method and apparatus for downlink OFDMA having DFT-precoding applied thereto

A method by a terminal in a communication system, the method comprising:

• receiving, from a base station, information indicating a number of discrete fourier transform (DFT)-precoding chunks on which DFT precoding is performed;
• receiving, from the base station, downlink control information (DCI) including a resource allocation field configured based on the number of DFT-precoding chunks;
• and
• receiving data from the base station based on the resource allocation field included in the DCI,
• wherein the number of DFT-precoding chunks is associated with a power backoff value of a power amplifier (PA) of the base station.

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

• a transceiver;
• and
• a controller operably connected to the transceiver, the controller configured to:
• determine a number of discrete fourier transform (DFT)-precoding chunks on which DFT precoding is performed,
• determine a power backoff value of a power amplifier (PA) of the base station,
• transmit information indicating the number of DFT-precoding chunks to a terminal,
• transmit, to the terminal, downlink control information (DCI) including a resource allocation field configured based on the number of DFT-precoding chunks, and
• transmit data to the terminal according to the resource allocation field included in the DCI,
• wherein the number of DFT-precoding chunks is associated with the power backoff value of the PA of the base station.

A terminal in a communication system, the terminal comprising:

• a transceiver;
• and
• a controller operably connected to the transceiver, the controller configured to:
• receive, from a base station, information indicating a number of discrete fourier transform (DFT)-precoding chunks on which a DFT precoding is performed,
• receive, from the base station, downlink control information (DCI) including a resource allocation field configured based on the number of DFT-precoding chunks, and
• receive data from the base station based on the resource allocation field included in the DCI,
• wherein the number of DFT-precoding chunks is associated with a power backoff value of a power amplifier (PA) of the base station.