Performance analysis of QAM-modulation parameters on FFT-OFDM system over Doppler frequency fading channels
by Haitham Jabbar Taha, M.F.M. Salleh
International Journal of Information and Communication Technology (IJICT), Vol. 3, No. 1, 2011

Abstract: The typical subcarrier modulation schemes used in orthogonal frequency division multiplexing (OFDM) system includes: binary phase shift keying (BPSK), quadrature phase shift keying (QPSK) and quadrature amplitude modulation (QAM). This paper analyses the performance of OFDM system that uses various number of modulation QAM constellation points over various fading channels. Simulation is done for various numbers of QAM (8 to 64-points) and with various Doppler frequency values (5 to 500 Hz) over flat and frequency selective fading channels. Results show that the best performance of OFDM system is with the number of QAM of 8 and maximum Doppler shift (MDS) of 5 Hz at all channels.

Online publication date: Mon, 20-Oct-2014

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