... severity of fading and r(m) is the Gamma function [90]. When m = 1, the PDF of (6.22) is reduced to the PDF of y over Rayleigh fading channel, which is given in (6.1). As m increases, ... channel and f(7) is the PDF of the SNR per symbol y. Explicitly, (6.43) implies weighting the BEP p,, (y) by its probability of occurrence quantified in terms of its PDF and then averaging, ... (SI) = Pth. The former condition corresponds to either si = 0 for some PDF f(7) or to sk = CO for all PDFs. By contrast, when the condition of bl p,, (SI) - bo p,, (SI) =...