WHT and Double WHT: An effective PAPR reduction approach in OFDM

With rapid growth in communication orthogonal frequency division multiplexing (OFDM) is multi-carrier communication technique becomes more popular which is used in both wired and wireless communication. OFDM consist of multiple carriers over single channel for signal transmission. OFDM is the time domain signal which is made up of several sinusoids and due to this sinusoids Peak to Average Power Ratio (PAPR)of OFDM signal increases. Due to this high PAPR transmission efficiency reduces so PAPR is major drawback of OFDM. There are several PAPR reduction techniques but, pre-coding techniques shows better result. In this paper, we propose Walsh Hadamard Transform (WHT) and Double Walsh Hadamard Transform (Double WHT). The proposed scheme shows the better results.