View article

Multiplier less Inverse Fast Fourier Transform is a efficient technique for designing an orthogonal frequency division multiplexing based digital transmitter. OFDM plays a vital role in wireless systems like IEEE 802.11 x and IEEE 802.16 x. In this paper, an efficient way of FFT implementation has to be done. This works mainly concentrates on reduction of hardware complexity and power consumption due to the complex multiplication involved in twiddle factors at the input stage of IFFT processing unit. This trivial multiplication can be replaced by concepts of ‘pass-logic’which eliminates the multiplication factor in butterfly module. This technique optimises the FFT structure with less power and less area. The comparison of various N point FFT with multipliers and pass-logic has been tabulated. The performance improvement of FFT has to be analysed. The proposed architecture with pass logic is an encouraging phenomenon in OFDM based wireless systems.