Coherent Detection in Fading Channels Based on the EM Algorithm

Coherent Detection in Fading Channels Based on the EM Algorithm

As will be seen below, the maximum-likelihood sequence detector in fading channels typically has prohibitive computational complexity. The EM algorithm is an iterative technique for solving complex maximum-likelihood estimation problems. In this section we discuss sequence detection in fading channels based on the EM algorithm. Both a batch algorithm and a sequential algorithm are discussed.