Performance of MMSE turbo equalization using outer LDPC coding for magnetic recording channels

• Published in: 2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577) Vol. 2; pp. 645 - 650 Vol.2
• Main Authors: Olcer, S., Keskinoz, M.
• Format: Conference Proceeding
• Language: English
• Published: Piscataway, New Jersey IEEE 2004
• Subjects: Applied sciences; Coding, codes; Conferences; Decoding; Detection, estimation, filtering, equalization, prediction; Detectors; Equalizers; Exact sciences and technology; Filters; Information, signal and communications theory; Intersymbol interference; Laboratories; Magnetic analysis; Magnetic recording; Parity check codes; Performance loss; Signal and communications theory; Signal, noise; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Performance evaluation; Equalizer; Equalization; Mean square error; Partial response channels; Simulation; Intersymbol interference; Coding; A posteriori estimation; Convergence rate; Parity check codes; Error correcting code; Magnetic recording
• ISBN: 0780385330; 9780780385337
• DOI: 10.1109/ICC.2004.1312581

We investigate the performance of minimum mean-square error turbo-equalization for LDPC-coded transmission over intersymbol-interference channels. The EXIT-chart technique is used to study the effect of code rate on the convergence of the turbo-equalization process. The analysis is conducted for partial-response channels of various types and for the magnetic recording channel. Performance results obtained from simulations show good agreement with the EXIT-chart analysis. They indicate that for applications requiring high code rates equalizer-based detection may suffer from a nonnegligible loss in performance as compared with maximum a posteriori detection.