FPGA BASED OFDM SYSTEM FOR WIRELESS COMMUNICATION

Abstract

Orthogonal Frequency Division Multiplexing (OFDM) is the dominant transmission technique used in the 802.11 set of Wireless
LAN standards. It divides the available spectrum into several carriers, each one modulated by a low rate. The objective is to use
High-Speed-Integrated-Circuit Hardware Description Language to produce VHDL codes that carry out FFT and IFFT function.
The main objective of this project is to implement the core signal processing blocks of IEEE 802.11a & IEEE 802.11b
Transreceiver system on FPGA using VHDL & implement it on FPGA. Xilinx tool is used to synthesis the net list and to generate
the synthesis report of our design. Modelsim is used to simulate the performance of the design at various levels it helps to generate
simulation result for various data entry at various blocks in the design. The Fast Fourier Transfer and Inverse Fast Fourier
Transfer have been chosen in the design instead of the DFT and IDFT because they offer good speed and less computational time.
OFDM processing, which is carried out in digital domain, can be implemented as application specific integrated circuit (ASIC) or
general purpose processor (GPP). General purpose processors have limitation of performances requested by wire rates. On the
other side, ASIC circuits can reach high speed processing, but once they have been designed it is impossible to change them. For
OFDM implementation FPGA will be the best choice since it gives flexibility to the program design besides the low cost hardware
as compared to others.