Nonlinear performance study of dual FDTS/DF detector for magnetic recording channels

Dual FDTS/DF detector is an advanced version of FDTS/DF detector that gives significant performance improvement over FDTS/DF scheme on linear channels , and moreover, in contrast to other dual-detector schemes, it is suitable for various d-constraint coded channels. As recording density increases, ch annel nonlinearities such as non-linear transition shift (NLTS) and partial erasure (PE) degrade the performance of detectors. In this paper, we use n onlinear channel models to study the BER performance of dual FDTS/DF detect or and compare the performances with those of other detectors through bit-b y-bit simulations. Simulation results show that the dual FDTS/DF detector i s superior in performance compared to FDTS/DF and MDFE detectors even on no nlinear channels, and it gives comparable BER performance with M2DFE (adv.) on nonlinear channels. Results also indicate that the detectors on the d = I coded channels are more robust to channel nonlinearities compared to tho se of other detectors (such as PRML family detectors) on the d = 0 coded ch annels.