Minimum Mean Square Error—Successive Interference Cancellation for Cyclic Interleaved Frequency Division Multiplexing

ABSTRACT Cyclic interleaving serves as an effective technique to counteract channel fading. Recently, a successive interference cancellation (SIC) method has been introduced for cyclic interleaved frequency division multiplexing (CIFDM). Although CIFDM‐SIC successfully eliminates a major portion of the multipath interference, a significant challenge persists due to the semiorthogonality of the codes, resulting in residual interference. Furthermore, the SIC amplifies noise, resulting in performance degradation. In light of these issues, we propose a novel minimum mean square error‐SIC (MMSE‐SIC) method for CIFDM. This method is meticulously designed to eliminate residues at each stage of the SIC while concurrently minimizing noise enhancement. The proposed CIFDM‐MMSE‐SIC demonstrates superior bit error rate performance compared with the current CIFDM‐SIC across various realistic scenarios.