Certain investigations on reconfigurable low power architecture for ofdm with noise suppression

Abstract

The Orthogonal Frequency Division Multiplexing OFDM communication system is used in various modern day wireless standards The vital component in mobile and wireless communication is OFDM The Orthogonal Frequency Division Multiplexing technique is used in various wireless standards such as Wireless Local Area Network WLAN WiMAX and Digital Video Broadcasting Terrestrial The OFDM system consists of the Mapper Serial to Parallel converter Pilot insertion block Inverse Fast Fourier Transform IFFT Parallel to Serial converter Analog to Digital ADC unit Fast Fourier Transform FFT and Digital to Analog DAC unit OFDM follows multi carrier technique where the many carriers are obtained by splitting the spectrum The digital modulation of the original message is carried out as the initial process of OFDM Then the FFT will convert the time domain signal to frequency domain signal The IFFT will reverse the operation of FFT The increasing need for mobile applications in the fast growing technology require this OFDM to integrate with the applications The OFDM system can be realized in two ways namely FFT and Discrete Wavelet Transform DWT The OFDM FFT shows a performance improvement in terms of area speed and power but fails to improve Peak to Average Power Ratio PAPR On the other hand, the OFDM DWT shows a promising improvement in terms of PAPR This research work presents a reconfigurable OFDM which will configure between the FFT and DWT based on the application needs This reconfigurable OFDM system is developed using Verilog HDL and targeted in various FPGA devices like Spartan 3E Complex Programmable Logic Devices CPLD and Virtex This OFDM system shows a remarkable performance improvement in terms of PAPR at the cost of area overhead The proposed OFDM saves 58.67% and 57.05% sliced Look UpTable LUT and Gate Element GE respectively with respect to shared resources. newline