Impact Study and Evaluation of Higher Modulation Schemes on Physical Layer of Upcoming Wireless Mobile Networks

Heba Haboobi, Mohammad Kadhum

Research output: Contribution to JournalArticlepeer-review


In this paper, the higher modulation formats (128 and 256) Quadrature Amplitude Modulation (QAM), for modulation/ demodulation the digital signal of the currently used Orthogonal Frequency Division Multiplexing (OFDM) system,
is proposed, explored and evaluated at a wireless transmission system. The proposed modulation schemes are utilized to study the impact of adding extra bits for each transmitted sample on system performance in terms of the channel capacity, Bit Error Rate (BER) and Signal to Noise Ratio (SNR). As such, the key purpose of this research is to identify the advantages and disadvantages of using higher modulation schemes on the physical layer (PHY) of future mobile networks. In addition, the trade-off relation between the achieved bit rate and the required power of the receiver is examined in the presence of the Additive White Gaussian Noise (AWGN) and Rayleigh noise channels. Besides, the currently employed waveform (OFDM) is considered herein as an essential environment to test the effect of receiving additional complex numbers on the constellations table. Thus, investigate the ability to recognize both the phase and amplitude of intended constellations for the upcoming design of wireless transceivers. Moreover, a MATLAB simulation is employed to evaluate the
proposed system mathematically and physically in an electrical back-to-back transmission system.
Original languageEnglish
Pages (from-to)665-676
Number of pages12
JournalInternational Journal of Advanced Computer Science and Applications
Issue number5
Publication statusPublished - 31 May 2019


  • Higher Modulation Schemes
  • Wireless networks
  • Mobile
  • Technology


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