Low complexity PARAFAC receiver for MIMO-OFDMA system in the presence of multi-access interference

Synchronization errors in time and frequency occur in OFDM, OFDMA leading to interferences that complicate data detection at the receiver. The trilinear data model for MIMO-OFDMA for any arbitrary carrier assignment scheme is formulated. We propose to accomplish user´s separation at the BS using estimates of the multiple CFOs and then use PARAFAC-TALS for blind estimation of user´s parameters. We show that the proposed receiver not only relaxes the identifiability criteria but also simplifies the tri-linear alternating least squares iteration.