GFDM-OQAM Performance Analysis Using Linear Equalization for Audio Transmission

Abstract

In order to minimize Inter-Carrier Interference (ICI), Inter-Symbol Interference (ISI), and Out of Band (OOB) impacts on Orthogonal Frequency Division Multiplexing (OFDM) systems, strong wireless communication performance is required. The use of Generalized Frequency Division Multiplexing (GFDM) is based on the requirement for a block-based multi-carrier technology in which each subcarrier is generated with a filter in the form of non-rectangular pulses known as pulse shaping. Meanwhile, Offset QAM (OQAM) is used to achieve better spectral efficiency than QAM and simultaneously reduce the occurrence of ICI and ISI. In this study, the effect of adjusting the roll-off factor value on the pulse shaping filter utilized is examined in order to detect the original signal supplied by the transmitter using two linear equalizations: Zero Forcing (ZF) and Minimum Mean Square Error (MMSE). The results show that the Signal to Noise Ratio (SNR) used in this study is varied from 0 dB to 15 dB, and the Bit Error Rate (BER) obtained when the SNR is 15 dB on GFDM-OQAM using ZF and MMSE are 0.03872 and 0.01986 respectively. Then this study indicates that the GFDM-OQAM system using MMSE equalization has a better BER value than the GFDM-OQAM system using ZF equalization. In addition, the greater the use of the roll-off factor, the lower the performance of the BER system because there is a greater excess bandwidth which is linear with the magnitude of the roll-off factor.