Modulation Code and Signal Characteristics for Signal Waveform Modulation Optical Disc
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概要
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A high-efficient and novel varying-level multilevel run-length-limited modulation code is proposed for signal waveform modulation (SWM) optical discs. The proposed code is composed of a maximum transition run (MTR) code and a level modulation process. The MTR code is employed to realize high code rate and satisfy the requirements of channels. Level modulation is used to eliminate inappropriate codewords for SWM channels and determine the level numbers for different runs. The rate of the presented code is 7/8 bits/symbols, and the recording density parameter RBPF (recording bits per 400 nm) is 2.26, which is 50.7% more than that of a digital versatile disc (DVD). The realization of the proposed code in SWM discs and the corresponding signal characteristics are also shown. With the run-length detection and level detection solution, the bit error rate (BER) is less than $2\times 10^{-4}$, which is feasible for SWM multilevel optical discs.
- 2010-08-25
著者
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Pan Longfa
Optical Memory National Engineering Research Center, Department of Precision Instrument and Mechanology, Tsinghua University, Beijing 100084, China
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Liu Hailong
Optical Memory National Engineering Research Center, Department of Precision Instrument and Mechanology, Tsinghua University, Beijing 100084, China
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Pei Jing
Optical Memory National Engineering Research Center, Department of Precision Instrument and Mechanology, Tsinghua University, Beijing 100084, China
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Ni Yi
Optical Memory National Engineering Research Center, Department of Precision Instrument and Mechanology, Tsinghua University, Beijing 100084, China
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