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Research on Error Correction and Performance Evaluation in Multi-level Optical Storage

Author: WuSuZuo
Tutor: XiongJianPing
School: Tsinghua University
Course: Instrument Science and Technology
Keywords: Multi-stage optical storage Error correction coding Markov model
CLC: TP333.4
Type: Master's thesis
Year: 2009
Downloads: 7
Quote: 0
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Abstract


Through one channel of the optical disc recording unit of two or more possible states, it is possible to increase the recording density of the optical disc unit area, but also increases the possibility of errors of the data, error correction code performance raised higher requirements. Red multi-level optical disc HRD (High Definition Red Disk), Tsinghua University Optical Memory National Engineering Research Center in the research project. The purpose of this paper is an error-correcting format designed for HRD and assess the performance of the format. Which, due to the use of the traditional Monte-Carlo simulation method (hereinafter referred to as the MC method) the assessment error correction performance, there is a long calculation time (to achieve the target accuracy of analysis need to analyze large amounts of data samples), this subject needs to establish a Theoretical analysis method - the method of analysis accuracy is not limited calculation time - in order to adapt to the requirements of multi-order optical storage channel error correction assess accuracy. The main work of this paper include error correction format design and performance evaluation model, the main contents are: 1. Research analysis and simulation to compare the performance and the decoding strategy of DVD and BD error correction format, provides storage for multi-order red light error correction format design basis; design a new error correction format, the key data, common data address protection, RS code, such as the implementation different protection of intensity; preparation of the related software, data organization, scrambling, interleaving, encoding module with the corresponding decoding module. Establish order optical storage channel Markov model and solving method. Comparison of different Markov model for the disc channel Fritchman model is selected as the object of study. Two seeking Markov model parameters - fitting method to optimize the Baum-Welch iterative method (BWA). The results of the fitting method as the initial value of the BWA iteration, can avoid the iterative non-global optimal value; This paper also studied and the BWA algorithm improved algorithm, greatly reducing the time to solve the optical channel model. Finally, the use of the actual multi-level optical disc read data, solving the channel model. Deduced Markov model in multi-stage optical storage channel error correction performance evaluation formula. The combination of enumeration and collection operations, matrix operations, and iterative mathematical methods to solve the performance of these two issues does not match the order optical storage channel transmission symbol error correction symbol size and existing disc format is difficult to assess because of the complex error correction scheme. Finally, the results of the work of these three parts, on actual channel DVD, HRD, BD error correction scheme assessment results show that: the design of a new type of HRD performance and bit rate of the error-correcting codes are better than the DVD; using Markov model theory analysis methods can not only be a good predictor of the actual optical storage channel error, you can also make a performance analysis of the error correction code to meet the requirements of the analytical precision.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Electronic digital computer (not a continuous role in computer ) > Memory > Optical memory drive
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