IJSEA Archive (Volume 2, Issue 7)
International Journal of Science and Engineering Applications (IJSEA) (Volume 2, Issue 7 - July 2013)
Design and Implementation of Inverse Fast Fourier Transform for OFDM
R. Durga Bhavani, D. Sudhakar
Keywords: OFDM, IFFT, FFT, QPSK.
OFDM is the most promising modulation technique for most of the wireless and wired communication standards. The basic idea of OFDM is to divide the available spectrum into several sub channels, making all sub channels narrowband which experiences flat fading. OFDM uses the spectrum efficiently due to its orthogonality and prevents interference between the closely spaced carriers. OFDM provides high bandwidth efficiency because the carriers are orthogonal to each others and multiple carriers share the data among themselves. The main advantage of this transmission technique is their robustness to channel fading in wireless communication environment. The main focus of this paper is to design IFFT and FFT blocks which are used in transmitter and receiver blocks of OFDM system. The methodology used is the 8-point IFFT/FFT (DIF) with radix-2. The design unit also consists of spreader and despreader for mapping technique. The implementation is done in FPGA by using Verilog HDL. The timing simulation and synthesized results are performed and the design is analyzed by using Xilinx ISE tools.
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title = "FPGA Implementation of Real Time Data Acquisition System Using Micro blaze Processor. ",
journal = "International Journal of Science and Engineering Applications (IJSEA)",
volume = "2",
number = "7",
pages = "155 - 158",
year = "2013",
author = " R.Durga Bhavani, D.Sudhakar ",