Design of data adaptive IFFT/FFT block for OFDM system

Inverse Fast Fourier Transform/ Fast Fourier Transform (IFFT/FFT) processors are crucial blocks for an Orthogonal Frequency Division Multiplexing (OFDM) transceiver system. However, in the current OFDM systems, the system complexity and processing rate do not vary adaptively with the input data. In this paper, we propose a novel IFFT/FFT architecture for the OFDM Transceiver system that exploits the correlation between bytes of incoming information to adaptively choose between the Radix-2 and Radix- 4 algorithm. Using this architecture, we have achieved additional free data slots per frame. The transceiver system has been tested end-to-end and implemented on FPGA Board.