2026-03-10T15:43:20Z https://kindai.repo.nii.ac.jp/oai

oai:kindai.repo.nii.ac.jp:00019028 2023-06-20T18:38:48Z 14:923:2405:4391

OFDM方式を用いた光ディスク高密度化の検討 Study of high density optical disc recording using OFDM method 齊藤, 公博 サイトウ, キミヒロ Optical disc PRML OFDM This paper describes the application of Orthogonal Frequency Division Multiplexing (OFDM) method to optical disc recording/readout. OFDM has been widely used in the field of telecommunication owing to its highly efficient frequency usage. However OFDM has not been applied to the optical disc recording because it is a multiple data transfer method and needs to record analog signals. Partial Response Maximum Likelihood (PRML) used in the current optical disc systems requires a certain kind of analog recording. In addition, it is found that the level adjustment of multiple carriers lead to a freedom to adapt the optical disc system characteristics. Using the simple transfer function model of optical disc system, two types of readout signals are calculated and then their qualities are compared. Since Quadrature Amplitude Modulation (QAM) method can be combined with OFDM, it is possible to increase the recoding density of optical disc systems. A method employing OFDM with 64-QAM and the pre-enhance method to the high frequency carrier shows an ability of 1.5 times recording density of the conventional Bru-ray Disc (BD). application/pdf 近畿大学工業高等専門学校 2017-03-15 jpn departmental bulletin paper NA https://kindai.repo.nii.ac.jp/records/19028 18824374 近畿大学工業高等専門学校研究紀要 Research reports Kindai University Technical College 10 31 36 https://kindai.repo.nii.ac.jp/record/19028/files/AA12315376-20170315-0031.pdf application/pdf 590.6 kB 2017-12-15