Browsing by Author "Tseng, Chien-Fu"

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A two dimensional partial-response maximum-likelihood technique for holographic data storage systems
(2008-07-01)
Lai, Kuo-Hsin
;
Tseng, Chien-Fu
;
Chen, Po-Chang
;
Tarng, Jenn-Hwan
;
電信工程研究所
In holographic data storage systems, it is straightforward to increase the storage capacity by mean of reducing the pitches among data symbols. However, this may lead to severe. inter-symbol interference (ISI) and also unacceptable data error rate. To deal with the problem, we first model the channel as a partial response (PR) and use the maximum-likelihood (ML) detection to control the ISI. The Viterbi decoder is employed to implement ML detection.
Gray apertures for holographic data storage system
(2008-07-01)
Tarng, Jenn-Hwan
;
Tseng, Chien-Fu
;
Lin, Chip-Ming
;
Lo, Feng-Hsiang
;
電信工程研究所
In this paper, we propose the idea of gray optical apertures in contrast to the conventional binary apertures for holographic data storage (HDS). A gray aperture can be realized by a liquid crystal display or a binary aperture with a coating near the edge. In our simulation, HDS with a gray aperture shows a better page signal-to-noise ratio and modeling accuracy than HDS using a binary aperture.
Low-Complexity and Piecewise Systematic Encoding of Non-Full-Rank QC-LDPC Codes
(2015-06-01)
Tseng, Chien-Fu
;
Tarng, Jenn-Hwan
;
電機資訊學士班
;
電信工程研究所
;
Undergraduate Honors Program of Electrical Engineering and Computer Science
In this letter, we present a low-complexity encoding method for quasi-cyclic (QC) low-density parity-check (LDPC) codes in the case of non-full-rank parity-check matrices. Gaussian elimination can achieve systematic encoding, but it is usually too complex to implement. For QC-LDPC codes, efficient encoding methods have been presented by using shift-registers, but the encoded codewords are not systematic when parity-check matrices are non-full-rank. However, a systematic structure is important in practice. Therefore, we propose an encoding method which allows all information bits appear piecewise in the codeword, called piecewise systematic encoding.