Iterative equalization and carrier synchronization for single-carrier transmission over severe time-dispersive channels

In this paper we consider a broadband wireless system employing SC (Single-Carrier) modulations combined with FDE (Frequency-Domain Equalization). We propose a receiver structure for joint carrier synchronization and equalization which combines IB-DFE (Iterative Block Decision Feedback Equalization) and post-equalization carrier synchronization schemes. The proposed receiver can be regarded as a modified IB-DFE where we perform a decision-directed frequency offset estimation within each iteration of the equalizer. Our results show that the proposed receiver structure has a good performance, allowing BERs (Bit Error Rate) close to the MFB (Matched Filter Bound), even with moderate frequency offsets and severe time-dispersive channels.