Conference Paper

Performance of GS913(Guided Scrambling nine to thirteen) modulation code for high density rewritable optical disc

Authors:
To read the full-text of this research, you can request a copy directly from the authors.

Abstract

Recently, for HD video recorders, a high density rewritable disc system using a blue laser diode has been strongly recommended. At the last ODS and ISOM, we proposed extremely efficient DC-free RLL codes for a high density rewritable optical system (K.A.S. Immink et al, ODS '01, WC1, 2001, and ISOM '01, TH-J-29, pp. 152-153, 2001). Additionally, we have shown that the newly developed GS913 (guided scrambling 9 to 13), d=1 code can achieve a 4.5% higher overall rate compared with the (1,7)PP code. In this paper, we report the performance of this GS913 code for a high density rewritable disc system using a blue laser diode (405 nm), NA 0.85 and 0.1 mm thickness cover layer.

No full-text available

Request Full-text Paper PDF

To read the full-text of this research,
you can request a copy directly from the authors.

Article
For effective DC-free coding in the optical storage systems, the Guided Scrambling algorithm is widely used. To reduce digital discrepancy of the coded sequence, functions of digital sum value (DSV) are used as criteria to choose the best candidate. Among these criteria, the minimum digital sum value (MDSV), minium squared weight (MSW), and minimum threshold overrun (MTO) are popular methods for effective DC-suppression. In this paper, we formulate integer programming models that are equivalent to MDSV, MSW, and MTO GS coding. Incorporating the MDSV integer programming model in MaxMin setting, we develop an integer programming model that computes the worst case MDSV bound given scrambling polynomial and control bit size. In the simulation, we compared the worst case MDSV bound for different scrambling polynomial and control bit sizes. We find that careful selection of scrambling polynomial and control bit size are important factor to guarantee the worst case MDSV performance.
Article
For effective dc-free coding in the optical storage systems, guided scrambling (GS) multimode coding is popularly used. To reduce digital discrepancy of the coded sequence, functions of running digital sum (RDS) are used as criteria to choose the best candidate. Among these criteria, the minimum RDS (MRDS), minimum squared weight (MSW), and minimum threshold overrun (MTO) are suggested for effective dc-suppression. In this paper, we formulate integer programming models that are equivalent to MRDS, MSW, and MTO GS coding. Incorporating the MRDS integer programming model in maxmin setting, we develop an integer programming model that computes the worst case MRDS bound given scrambling polynomial and control bit size. In the simulation, we compare the worst case MRDS bound for different scrambling polynomials and control bit sizes. We find that careful selection of scrambling polynomial and control bit size are important factors to guarantee the worst case MRDS performance.
Article
Full-text available
We report on new DC-free runlength-limited codes (DCRLL) intended for the next generation of DVD. The efficiency of the newly developed DCRLL schemes is extremely close to the theoretical maximum, and as a result, significant density gains can be obtained with respect to prior art coding schemes
Article
The possibility of high-density groove-only recording was investigated by using a high-numerical-aperture lens unit and an InGaN semiconductor laser. Wobbled grooves of 20 nm in depth were formed through a deep-UV disk mastering process and replicated by injection molding onto a polycarbonate disk substrate. This shallow wobbled groove structure improves a signal-to-noise ratio (SNR) and also enables an address in pre-grooves (ADIP). In the experiment, signals were recorded either in or on the grooves, and the achievable areal recording density was carefully examined in each case, comparing with a previous land-and-groove disk configuration. The authors' results indicate that the signal recording on the grooves, which correspond to the structured area located closer to the objective lens, brings higher track density than that in the grooves. A bit size of 120 X 320 nm, an areal density of 16.8 Gbit/in2, was verified at the data transfer rate of 35 Mbps on a phase-change disk of SbTe-based eutectic composition. This bit density can realize a storage capacity of 23.3 GB on a f 120 mm disk. Further investigation on higher areal density was also examined with an additional signal processing.