Enhancement of Analytical OBR (Out of Band Radiation) and BER Calculation for Digital Au-dio-Video Broadcasting in Companded OFDM System using Non-Symmetric QAM/QPSK TecniquesJournal: International Journal of Advanced Engineering Research and Science (Vol.4, No. 4)
Publication Date: 2017-04-08
Authors : Santosh; Piyush Vyas; K. K. Arora;
Page : 136-141
Keywords : Companding; OFDMA; CDMA; TDMA; FDMA; Digital Techniques and their performance.;
Companding transforms useful under assumption of infinite bandwidth. Under band limited conditions OBR parameter filters out. So bandwidth is a factor that decides the filter-ing out OBR on the performance of companded OFDM sys-tems. As a result filtering becomes essential under band lim-ited conditions in turn this does deteriorate the system per-formance significantly. In this paper method proposed to overcome the performance degradation. Method called non symmetric scheme based on the use of curve fitting method to find out a suitable polynomial to be used for decom-panding at the receiver. This method indeed improves the performance in comparison to existing symmetric methods when filtering is necessary for band limited conditions.
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