ABSTRACT:

Orthogonal Frequency Division Multiplexing could be a theme utilized in the area of high-information-rate mobile wireless communications like cellular phones, satellite communications and digital audio broadcasting. The Fourier transform, in essence, decomposes or separates a waveform or operate into sinusoids of various frequencies which total to the first waveform. It identifies or distinguishes the different frequency sinusoids and their respective amplitudes.

In many applications high-speed performance is needed. For this purpose, typical multi-carrier techniques are usually chosen, but this lead to the lowering of spectrum efficiency. So, the principles of Orthogonal Frequency Division Multiplexing are employed in such applications. This paper offers the small print of the development of IFFT & FFT algorithms to be employed in OFDM systems primarily based on the IEEE 802.11a commonplace for WLAN. This system consists of separate OFDM transmitter & receiver. Actually, in the complete design of OFDM system, all the mathematical manipulations happen in these two blocks solely, i.e. IFFT & FFT blocks whereas rest of the blocks convert the data from one format to another format. In this paper we have implemented FFT and IFFT blocks. The speed enhancement is the key contribution of the most processing blocks in OFDM system.

However, the appearance of the Discrete Fourier Remodel (DFT) created this transmission scheme more plausible. The Fast Fourier Rework (FFT) and the Inverse Fast Fourier Transform (IFFT) are the more economical implementations of the DFT, are used for the bottom band OFDM modulation and demodulation method.

APPLICATIONS:
  • Digital Signal Processing
  • Wireless LANs
TOOLS REQUIRED:
  • MODELSIM – Simulation
  • XILINX-ISE – Synthesis


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