5.5.3 The optimum detector The Optimum Detector: MAP: Max a posterior probability Note that f(rs,)is usually called likelihood funct ML Maximum-likelihood Min-Dist Minimum-distance Maximum-likelihood (ML):to select the s,that Max-Corr:Maximum Correlation Denoted by, s=arg max,{f(rIs) Minimum-distance (Min-Dist):to select the s,that is nearest to r, that is s=arg min,D(r,s) and,D(r,s )=r-s ecalu.-j网] It is more convenient to work with,In (n() Clearly,max of f(rls)is same as min ofr-s,which is the distance bwtween r and s, UESTC-Digital transmission through the AWGN channel Prof李晓峰 12