Crimson Publishers-Material Science

Hybrid PAPR Reduction Scheme for Universal Filter Multi-Carrier Modulation in Next Generation Wireless Systems by Himanshu Monga in Crimson Publishers: Peer Reviewed Material Science Journals Universal filter multi carrier (UFMC) is one of the promising multi carrier modulation techniques for next generation wireless communication systems. UFMC seems to be most attractive because it provides better sub carrier separation like FBMC (Filer Bank Multi Carrier) and less complexity like OFDM (Orthogonal Frequency Division Multiplexing). But this technique suffers from limitation of higher Peak to Average Power Ratio (PAPR). In this paper a Hybrid PAPR reduction technique SC- UFMC have been proposed using SLM (Selective Mapping) and Clipping. The performance of proposed technique is evaluated for various design parameters including filter length, FFT size and Bits per sub carrier. The simulation results show that hybrid technique provides better PAPR reduction as compared with convent...

Effect of Separator Thickness and Preheating Temperature on the Development of Microwave Processed Composite Clads by Sarbjeet Kaushal* in Crimson Publishers: Peer Reviewed Material Science Journals Microwave cladding has emerged as a noble surface modification method. Microwave cladding uses the principle of microwave hybrid heating in which a suitable separator material is used. In the present work, Ni/wc based composite clads were developed on austenitic steel through microwave heating route at 900W and 2.45GHz. The effect of various preheating temperature of raw powders and different thickness of separator on the development of composite clads have been analyzed. It was observed that the minimum processing time for development of clad was achieved at 1 mm thickness of susceptor and 180 °C of preheating temperature.   https://crimsonpublishers.com/rdms/fulltext/RDMS.000548.php For more Open access journals in Crimson Publishers please click on below  link ...