... vol 2007, Article ID 20258, 11 pages, 2007 [8] A Chakrabarti, A de Baynast, A Sabharwal, and B Aazhang, “LDPC codedesign for the relay channel, ” IEEE Journal on Selected Areas in Communications, ... compared, assuming the relay and the destination are known to all relevant channel parameters In order to achieve a fair comparison between noncooperative communication and a cooperative system, ... estimates, the EM algorithm can be used The EM algorithm is an iterative algorithm that alternates between an estimation step and a maximization step It allows calculating a ML estimate of a set...