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Modulation codes

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2 Author(s)
Yinyi Lin ; Dept. of Electr. Eng., Nat. Central Univ., Chung-Li, Taiwan ; Pi-Hai Liu

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

Published in:

Magnetics, IEEE Transactions on  (Volume:33 ,  Issue: 3 )