Performance Evaluation of Asymmetrical Run-Length-Limited Code for Optical Disks

摘要

A performance comparison between a rate 8/14 asymmetrical run-length-limited (RLL) code and the EFMPlus code for optical disks is described. The limited condition of the rate 8/14 asymmetrical code is (d_0, d_1, k) = (2, 1, 11). This code has a better detection window size than the EFMPlus code because of the 14.3% grater efficiency of its coding rate. We describe the bit error rate (BER) performance and the tilt and defocus tolerance of the rate 8/14 ARL code. Compared to the EFMPlus code, the rate 8/14 ARL code has a 0.7-dB gain in the required S / N at a BER of 10~(-4). The rate 8 /14 ARL code is also more robust against tilt and defocus.