A New 8-16 Channel Coding for High Density Recording

Abstract

We propose new channel coding for high-density recording, which is intended for use in high-capacity tape storage and optical disk systems. The new 8-16 channel coding improves recording density, facilitates clock recovery, and improves equalization quality. The codes and coding techniques enable effective control of the running digital sum (RDS) for suppression of low-frequency content, while strictly adhering to the (d, k) constraint. The new 8-16 channel coding is the first code which achieves (d, k) = (3, 10) (in NRZ notation) among the rate 1/2 codes which suppress low-frequency content. Computer simulations have demonstrated that the channel coding suppresses the low-frequency content of the encoded sequences equivalently to a DC-free Eight-to-Fourteen Modulation (EFM), producing a 6% higher information density.