Hanseok Kim Sihyun Lee Piljun Jeong Jaeha Kim Woo-Seok Choi Implementing FFE-MLSD With Improved BER and Reduced Complexity for Long-Reach PAM4 Wireline Receivers. 90726-90740 2025 13 IEEE Access https://doi.org/10.1109/ACCESS.2025.3572568 db/journals/access/access13.html#KimLJKC25 streams/journals/access