... confirm the efficiency and good performance of the iterative approach for the MIMO relay channel with and without the direct link. Furthermore, the proposed robustmethods significantly outperform the ... INS.(10) For the given channel estimatesH1,H2 ,and H0, the MSEmatrix of (10) is random due to the random errors E1,E2,andE0. Since the exact errors are not known and only the ... To the best source of our knowledge, the joint optimization of the source precoder, MIMO relay, and the destination equalizer has not been considered in the literature for the case where the...