SEP of the M-ary $$\theta $$-QAM signals under $$\eta -\mu $$ fading and AWGN noise in a communication system using spatial diversity

In this paper, an upper bound on the symbol error probability (SEP) of the M-ary $\theta -quadrature amplitude modulation scheme, in a channel subject to additive white Gaussian noise (AWGN) and \eta -\mu fading, is calculated by means of the union bound. In addition, an exact and closed-form expression for the pairwise error probability (PEP) of the system is derived. The PEP expression obtained is written in terms of the Beta function...