Title :
Charge-constrained (0,G/I:C) sequences
Author :
Lin, Yinyi ; Liu, Pi-Hai
Author_Institution :
Dept. of Electr. Eng., Nat. Central Univ., Chung-Li, Taiwan
fDate :
10/1/1997 12:00:00 AM
Abstract :
A (0,G/I) code is a modulation code used in the partial response maximum likelihood (PRML) recording system in which G and I represent the maximum number of zeros between two consecutive ones in the global sequence and the interleaved subsequences, respectively. For some magnetic recording systems such as the one with a helical scanning rotary head, a DC-balanced write waveform is required to meet channel requirements. In this study, charge-constrained (0,G/I:C) sequences which can generate a DC-balanced write waveform are investigated, where C represents the upper bound of charge. Based upon the runlength subgraphs and the transition matrices, capacities and power spectra of (0, G/I; C) sequences are derived and computed
Keywords :
Viterbi detection; binary sequences; channel capacity; digital magnetic recording; graph theory; interleaved codes; matrix algebra; maximum likelihood detection; modulation coding; partial response channels; runlength codes; DC-balanced write waveform; PRML recording system; Viterbi detection; capacity; charge-constrained (0,G/I:C) sequences; global sequence; helical scanning rotary head; interleaved subsequences; magnetic recording systems; modulation code; partial response maximum likelihood recording system; power spectra; runlength subgraphs; transition matrices; upper bound; Detectors; Helium; Interleaved codes; Magnetic heads; Magnetic recording; Maximum likelihood detection; Modulation coding; Timing; Upper bound; Viterbi algorithm;
Journal_Title :
Communications, IEEE Transactions on
