Error Correcting Capable 2/4 Modulation Code Using Trellis Coded Modulation in Holographic Data Storage

被引：6
|
作者：
Kim, Yongok [1 ]
Kong, Gyuyeol [1 ]
Choi, Sooyong [1 ]
机构：
[1] Yonsei Univ, Sch Elect & Elect Engn, Seoul 120749, South Korea
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS | 2012年 / 51卷 / 08期
关键词：
CONVOLUTIONAL-CODES; VITERBI ALGORITHM; MEMORY; EQUALIZATION; SYSTEMS;
D O I：
10.1143/JJAP.51.08JD08
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
An error correcting capable 2/4 modulation code scheme is proposed in holographic data storage (HDS) systems. We adopt trellis coded modulation (TCM) to obtain a good error correcting capability without loss of data rate in the HDS systems. To overcome loss of a data rate caused by a 1/2-rate convolutional code, we extend a 2/4 modulation code set the 3/4 modulation code set as high-order modulation in the proposed scheme. Additionally, we find an optimal mapping method of index numbers to maximize the free distance on the trellis and calculate the free distance according to each constraint length. The simulation results show that the proposed scheme with the same data rate has about 4 dB coding gains compared to the conventional 2/4 modulation coding scheme. (C) 2012 The Japan Society of Applied Physics
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页数：5
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