Electronics Project: Efficient FFT/IFFT implementation technique for OFDM on FPGA

Orthogonal Frequency Division Multiplexing (OFDM) is a special case of multicarrier transmission, where a single data stream is transmitted over a number of lower-rate subcarriers. With the rapid growth of digital wireless communication in recent years, the need for high-speed mobile data transmission has increased. FPGAs have become key components in the implementation of high performance DSP systems.

The objective of this paper is to design and implement a base band OFDM transmitter and receiver on FPGA hardware. This paper concentrates on developing FFT and IFFT. IFFT/ FFT are complex and main blocks of OFDM system also it consumes many resources so new technique is proposed in which FFT/IFFT is implemented in such a way that it consumes very less resources. The work also includes in designing a mapping module, serial to parallel and parallel to serial converter module. All modules are designed using VHDL programming language and implement on Spartan 3e designer kit.