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This article investigates the comparative between the Bit Error Rate (BER) performance of Phase Shift Keying (PSK) and quadrature amplitude modulation (QAM) based on Space Time Block Coded Orthogonal Frequency-Division Multiplexing based on Discrete Framelet transform (STBC-FT-OFDM) system. This comparison is accomplished through simulation programs for different constellation points numbers for M-PSK...
This paper presents five signal formats of return to zero (RZ), non-return to zero (NRZ), chirped return to zero (CRZ), soliton and duobinary in a transmission link. All the signals are compared in terms of its original and conversion to carrier suppressed. Long haul of 3880km is used in original transmitter while 770km used for conversion transmitter. The signal converter utilizes the semiconductor...
A multilevel inverter with real-time switching angle calculation modulation method is proposed. This proposed inverter modulation method is able to operate in real-time mode and calculate the switching angles without complex algorithm or time consuming iterations. The active switches in this proposed inverter operates at fundamental frequency of the AC mains, resulting in lower switching losses. The...
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