| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Improved partial response maximum likelihood method combining modulation code for signal waveform modulation multi-level disc |
| Wang He-Qun (王鹤群), Pei Jing (裴京), Pan Long-Fa (潘龙法) |
| Optical Memory National Engineering Research Center, Tsinghua University, Beijing 100084, China |
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Abstract In this paper, we describe an improved adaptive partial response maximum likelihood (PRML) method combining modulation code for signal waveform modulation multi-level disc. This improved adaptive PRML method employs partial response equalizer and adaptive viterbi detector combining modulation code. Compared with the traditional adaptive PRML detector, the improved PRML detector additionally employs illogical sequence detector and corrector. Illogical sequence detector and corrector can avoid the appearance of illogical sequences effectively, which do not follow the law of modulation code for signal waveform modulation multi-level disc, and obtain the correct sequences. We implement the improved PRML detector using a DSP and an FPGA chip. The experimental results show good performance. The higher efficient and lower complexity can be obtained by using the improved PRML method than by using the previous PRML method. Meanwhile, resource utilization of the improved PRML detector is not changed, but the bit error rate (BER) is reduced by more than 20%.
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Received: 26 January 2014
Revised: 17 March 2014
Accepted manuscript online:
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PACS:
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42.79.Vb
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(Optical storage systems, optical disks)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61127010). |
Corresponding Authors:
Wang He-Qun,Pei Jing
E-mail: wanghq_1230@tju.edu.cn;peij@mail.tsinghua.edu.cn
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| About author: 42.79.Vb |
Cite this article:
Wang He-Qun (王鹤群), Pei Jing (裴京), Pan Long-Fa (潘龙法) Improved partial response maximum likelihood method combining modulation code for signal waveform modulation multi-level disc 2014 Chin. Phys. B 23 104217
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