5.5.2 The optimum detector What is the best detector P is minimum when R corresponds to max P(s r). That lead to MAP criterion as follows. The Optimum Detector: P=P(e)=l-∑j。P(smlr)fr)dr MAP: Max a posterior probability ML: Maximum-likelihood Min-Dist Minimum-distance Max-Corr:Maximum Correlation Maximum a posterior probability (MAP):to select the s,that max the P(sr).Denoted by, s=arg max,.(P(s Ir) Note that P(s,r)is often called a posterior probability. Digital Communications Prof李晓峰 9