A weighted OFDM scheme with Hadamard transform and windowing techniques for PAPR reduction

In Orthogonal Frequency Division Multiplexing (OFDM) transmission technique, data is transmitted simultaneously over multiple carrier frequencies that are equally spaced. If correct time windowing is used at the receiver, the transmitted multiple carriers can be demodulated orthogonally. The method has been proposed for a lot of radio systems. It has high spectral efficiency and inherent resistance to dispersion in the propagation channel. OFDM is one of the most promising solutions for obtaining high data rate transmission in frequency selective fading radio channels. Irrespective of many positive aspects of OFDM, potentially high peak-to-average power ratio (PAPR) values is one of the noticeable limitation. Through this work, we are suggesting a method to reduce the value of PAPR through clipping and windowing technique which is easy to implement. This technique clips the OFDM signal to a predefined without data distortion in removing weight at the receiver side, by using a band limited signal & each clipping noise sample is multiplied by a window function. In the proposed scheme, thorough comparative study will be done to ensure that the BER performance and CCDF is much better compared to the existing clipping and filtering method. MATLAB toolbox will be used for the simulation study.