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- Ryoh Fuji-Hara, Ying Miao, Miwako Mishima
- IEEE Transactions on Information Theory
- 2004

Frequency hopping multiple access (FHMA) spread-spectrum communication systems employing multiple frequency-shift keying (MFSK) as data modulation technique are investigated from a combinatorialâ€¦ (More)

- Ryoh Fuji-Hara, Ying Miao
- IEEE Trans. Information Theory
- 2000

A (v, k, Î»a, Î»c) optical orthogonal code C is a family of (0, 1)-sequences of length v and weight k satisfying the following two correlation properties: (1) âˆ‘ 0â‰¤tâ‰¤vâˆ’1xtxt+i â‰¤ Î»a for any x = (x0, x1,â€¦ (More)

- Cunsheng Ding, Ryoh Fuji-Hara, Yuichiro Fujiwara, Masakazu Jimbo, Miwako Mishima
- IEEE Transactions on Information Theory
- 2009

Frequency hopping spread spectrum and direct sequence spread spectrum are two main spread coding technologies in communication systems. Frequency hopping sequences are needed in frequency hoppingâ€¦ (More)

- Gennian Ge, Ryoh Fuji-Hara, Ying Miao
- J. Comb. Theory, Ser. A
- 2006

Frequency-hopping multiple-access (FHMA) spread spectrum communication systems employing multiple frequency shift keying as data modulation technique were investigated by Fuji-Hara, Miao and Mishimaâ€¦ (More)

- Ryoh Fuji-Hara, Akihiro Munemasa, Vladimir D. Tonchev
- J. Comb. Theory, Ser. A
- 2006

Difference Systems of Sets (DSS) are combinatorial configurations that arise in connection with code synchronization. This paper gives new constructions of DSS obtained from partitions of hyperplanesâ€¦ (More)

- Yanxun Chang, Ryoh Fuji-Hara, Ying Miao
- IEEE Trans. Information Theory
- 2003

A (v, k, Î») optical orthogonal code C is a family of (0, 1) sequences of length v and weight k satisfying the following two correlation properties: (1) âˆ‘ 0â‰¤tâ‰¤vâˆ’1xtxt+i â‰¤ Î» for any x = (x0, x1, . . .â€¦ (More)

- Ryoh Fuji-Hara, Ying Miao, Jianxing Yin
- SIAM J. Discrete Math.
- 2001

- Ryoh Fuji-Hara, Scott A. Vanstone
- Eur. J. Comb.
- 1980

A problem which has recently attracted much interest is to arrange the blocks of a {v, k, 1)-BIBD into some of the cells of a square array such that each element of the design occurs in precisely oneâ€¦ (More)

- Ryoh Fuji-Hara, Shinya Kuriki
- Discrete Mathematics
- 1991

Fuji-Hara R. and S. Kuriki, Mutually balanced nested designs, Discrete Mathematics 97 (1991) 167-176. A mutually balanced nested design of strength t is introduced. It is shown that such a nestedâ€¦ (More)

- Ryoh Fuji-Hara, Ying Miao
- Des. Codes Cryptography
- 2002