Different QAM schemes analyses for ARS fading channels

Quadrature amplitude modulation (QAM) techniques are employed for variouscommunication systems due to its advantages such as efficient bandwidth andhigh rate. In this paper, the average symbol error rate (ASER) performancesof single-input single-output networks are investigated to address the differentQAM schemes combined use. The link in the network experiences the alter-nate Rician shadowed (ARS) fading which has the benefit of contributing leftor right-sided bimodality. Four different QAM schemes such as rectangularQAM, cross-QAM, hexagonal QAM, and square QAM are used for the consid-ered network. Under these assumptions, new closed-form expressions for theASER in terms of elementary functions and Meijer’sGfunctions are derived.The derived ASER expressions are obtained by employing the Prony approxima-tion with two terms which has fractional coefficients to provide precise results.Based on the second-order exponential function approximation for GaussianQ-function, the ASER expressions of the considered system are also proposed.Additionally, we provide other important engineering insights based on thehigh signal-to-noise-ratio analysis of the ASER performance over ARS fadingchannels. Finally, all our theoretical results are confirmed with simulations.