Bit error probability of the M-QAM scheme subject to multilevel (double) gated additive white Gaussian noise and Nakagami-m fading

摘要

In this paper, noise models called multilevel gated additive white Gaussian noise (GAWGN) and multilevel double gated additive white Gaussian noise (G(2)AWGN) are adopted, corresponding to the sum of a white Gaussian component of variance sigma(2)(g) and a white Gaussian noise component of variance sigma(2)(i) gated by a discrete random process defined in continuous time, C(t), which takes values into a finite discrete set. A channel subject to this noise combined with the Nakagamim fading can be used to characterize links in several environments subject to noise caused by different sources and with different intensities. In this work, new exact and closed- form expressions are presented for the bit error probability (BEP) of the M-ary quadrature amplitude modulation scheme (M-QAM) subject to Nakagami-m fading and multilevel GAWGN or multilevel G(2)AWGN. The BEP curves are presented for different parameters that characterize mathematically the channel, corroborated by simulations performed with the Monte Carlo method.