Pappu Tejaswi and T.S.N Murthy
Jawaharlal Nehru Technological University, India

Multiband Orthogonal Frequency Division Multiplexing (MB-OFDM) is used as efficacious procedure for ultra-wideband (UWB) wireless communication applications, which divides the spectrum into various sub-bands, whose bandwidth is approximately 500MHz. Major arduousness in multiband-OFDM is ,it have very large peak to average power ratio value which causes the signal to enter into dynamic region that consequence in the loss of orthogonal properties and results in the interference of the carrier signals which crops the amplifier saturation and finally limits the capacity of the system. Many PAPR amortize algorithms have reported in the survey and pre-coding is PAPR reduction which is inserted after modulation in the OFDM system. The Existing work presents the reduction of that value by different clipping techniques namely Classical-Clipping (CC), Heavy side-Clipping (HC), Deep-Clipping (DC) and Smooth-Clipping (SC) and their comparison analysis is done. Every clipping method is best at its own level .The proficiency of these strategies are evaluated in locutions of average power disparity, complete system decadence and PAPR reduction. Finally results show the MB OFDM yields better performance to reduce PAPR in effective way.

OFDM, PAPR, HPA, Clipping techniques, MB OFDM