Apparatus for controlling inverse fast fourier transform input in long term evolution system

An apparatus for controlling an Inverse Fast Fourier Transform (IFFT) input in a wireless communication system, the apparatus comprising:

• a first multiplexer configured to select a portion of data applied to a first stage of a Fast Fourier Transform (FFT) structure according to a predefined condition from among input data, and assign remaining data following the portion of the data to a memory of a second stage of the FFT structure, wherein the remaining data is data which is not selected by the first multiplexer;
• a butterfly operator configured to receive the portion of the data selected by the first multiplexer and perform a butterfly operation for the first stage of the FFT structure using the received data;
• a multiplier configured to output a value obtained by multiplying a result value output from the butterfly operator and a predetermined value together;
• and
• a second multiplexer configured to receive a value output via the multiplier and the remaining data to output to the second stage,
• wherein the portion of the data has a size of A-B/2 and the remaining data has a size B/2, wherein A represent a size of the symbol data, B represents a size of null data, and 2A represent a size of a total symbol data.