Offset invariance in maximum-likelihood decoding for a class of partial response channels

• Published in: IEEE communications letters Vol. 4; no. 7; pp. 229 - 230
• Main Authors: Dorfman, V., Wolf, J.W.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.07.2000; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Channels; Decoding; Detectors; Digital; Digital magnetic recording; Direct current; Electronics; Exact sciences and technology; Gaussian; Gaussian noise; Lifting equipment; Magnetic devices; Magnetic recording; Maximum likelihood decoding; Maximum likelihood detection; Offsets; Other magnetic recording and storage devices (including tapes, disks, and drums); Partial response channels; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Time factors; Voltage; Additive noise; Measurement sensor; Transmission channel; Digital recording; Time response; Maximum likelihood decoding; Gaussian process; Gaussian noise; Response time; Pulse response; Discrete time; White noise; Maximum likelihood; Magnetic recording
• ISSN: 1089-7798; 1558-2558
• DOI: 10.1109/4234.852924

In this letter we show that for a class of partial response channels with discrete-time pulse response of the form (1-D)P(D) whose output samples are corrupted by independent samples of additive white Gaussian noise with mean m, a maximum likelihood sequence detector designed for the case of m=0 is also the maximum likelihood sequence detector for an arbitrary value of m. The studied class of partial response channels is widely used for the characterization of digital magnetic recording channels where the DC offset is frequently an issue.