investigating the effect of dependence of fading coefficients and its modeling with copula theory in non-orthogonal multiple access (noma) channels with physical layer security

In wireless communication, in most mathematical modeling, it is assumed that the fading coefficients are independent of each other, if physically, there is a correlation between them. in this paper, the non-orthogonal multiple access (noma) downlink with physical layer security and dependent fading coefficients is investigated. the average secrecy rate (asr) for the noma channel in the presence of an eavesdropper has been investigated by modeling the dependence of extinction coefficients by copula functions. with mathematical calculations and numerical results, we compared the effect of correlation in the studied fading coefficients and independent fading coefficients to find out whether this modeling is useful or harmful.