Performance analysis of PAPR in G-OFDM with different digital modulation methods

Abstract

Abstract—Multicarrier transmissions are proved to be robust against the frequency-selective features of a communication channel and orthogonal frequency division multiplexing (OFDM) is the promising multicarrier modulation technique used in several applications. The high power amplifier at the end of OFDM transmitter is usually operated near the saturation region for high output power efficiency leading to nonlinear distortion in the communication channels due to high peak to average power ratio (PAPR) of the input signals. In OFDM systems, error correction code is essential for transmitting signals at high signal rate. Coded-OFDM techniques were investigated  earlier and was found to   improve efficiency of   wireless systems. In earlier paper, Goppa coded OFDM (GOFDM) was analyzed for its PAPR reduction capability as well as for forward error correction (FEC) for eight bit binary phase shift keying (BPSK) modulated data. But modulation techniques also play an important role in PAPR reduction and have been explained in this paper.

Therefore other modulation techniques are tried with Goppa coded information symbols and their PAPR have been analyzed. As evident in the graphs, quadrature amplitude modulation (QAM) and quadrature phase shift keying (QPSK) shows better reduction in peak power of the symbols.