Two-dimensional charge constrained modulation codes

Yinyi Lin, Pi Hai Liu

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)2451-2458
Number of pages8
JournalIEEE Transactions on Magnetics
Issue number3
StatePublished - 1997


  • (d, k) modulation code
  • Binary graph
  • Capacity
  • Power spectrum
  • Runlength graph


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