Efficient dc-free RLL codes for optical recording

Extremely efficient DC-free RLL codes for optical recording

Extremely E cient Dc-free RLL codes for Optical Recording

We will report on new dc-free runlength-limited codes (DCRLL) intended for the next generation of DVD. The e ciency of the newly developed DCRLL schemes is extremely close to the theoretical maximum, and as a result, signi cant density gains can be obtained with respect to prior art coding schemes.

EFM coding: Squeezing the last bits

Runlength-limited (RLL) codes have found widespread usage in optical and magnetic recording products. Specifically, the RLL codes EFM and its successor, EFMPlus, are used in the Compact Disc (CD) and the Digital Versatile Disc (DVD), respectively. EFMPlus offers a 6% increase in storage capacity with respect to EFM. The work reports on the feasibility and limits of EFM-like codes that offer an ...

Performance Investigation of Runlength- Limited Codes with Different d Constraints in Near-Field Optical Recording

This paper investigates the performance of runlength-limited (RLL) codes with different d constraints in near-field optical recording, for both the low-density parity-check (LDPC)-coded Bliss scheme and the standard concatenation scheme. Two state-independently decodable RLL codes, with d = 2, k = ¥ and d = 5, k = ¥ constraints respectively, are first designed for simulation. Both of these two ...

A combinatorial technique for constructing high-rate MTR-RLL codes

We present advanced combinatorial techniques for constructing maximum runlength-limited (RLL) block codes and maximum transition run (MTR) codes. These codes find widespread application in recording systems. The proposed techniques are used to construct a high-rate multipurpose modulation code for recording systems. The code, a rate 16/17, (0, 3, 2, 2) MTR code, that also fulfills (0, 15, 9, 9)...