Um Novo Método para o Cálculo da Probabilidade de Erro de Bit de Esquemas de Modulação Sujeitos ao Desvanecimento Rayleigh

This paper presents a new method for determining exact expressions for the bit error probability (BEP) of modu- lation schemes subject to Rayleigh fading. In this method the Rayleigh fading channel is seen as an additive noise channel whose noise is modeled as the ratio between a Gaussian ran- dom variable (r.v.) and a Rayleigh r.v. The method is based on the use of the cumulative density function of that additive noise to obtain closed-form expressions for the BEP of QAM (quadrature amplitude modulation ) schemes, subject to fad- ing. In particular, the proposed method is used to obtain new, exact and closed-form expressions for the BEP of 16-QAM, 64-QAM and 256-QAM. These expressions are shown to be in agreement with simulation results.