Author :
Lin, Yinyi ; Liu, Pi-Hai
Author_Institution :
Dept. of Electr. Eng., Nat. Central Univ., Chung-Li, Taiwan
fDate :
5/1/1997 12:00:00 AM
Abstract :
Two-dimensional (2-D) (d,k) codes have been proposed for multichannel recording systems. These codes increase storage density by employing a multichannel timing recovery mechanism. In addition to the (d,k) constraint, some recording systems require a charge constraint to meet the channel requirements. In this study, capacities of 2-D charge constrained modulation codes are derived and computed from the binary and runlength graphs of the codes. The power spectral densities of codes are computed from their runlength graphs. Finally, a method to construct 2-D charge constrained modulation codes is provided
Keywords :
graph theory; modulation coding; (d,k) constraint; binary graph; charge constraint; multichannel recording; power spectral density; runlength graph; storage density; timing recovery; two-dimensional modulation code; Clocks; Distortion; Eigenvalues and eigenfunctions; H infinity control; Helium; Interference constraints; Intersymbol interference; Modulation coding; Timing; Two dimensional displays;
Journal_Title :
Magnetics, IEEE Transactions on
