Performance analysis of QAM-modulation parameters on FFT-OFDM system over Doppler frequency fading channels

Authors:
Haitham Jabbar Taha;M. F. M. Salleh
Affiliations:
School Electrical and Electronic Engineering, Universiti Sains Malaysia, Seri Ampangan, 14300 Nibong Tebal, Pulau Pinang, Malaysia.;School Electrical and Electronic Engineering, Universiti Sains Malaysia, Seri Ampangan, 14300 Nibong Tebal, Pulau Pinang, Malaysia
Venue:
International Journal of Information and Communication Technology
Year:
2011

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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.