等重码的约翰逊界和格雷厄姆界的几点注记
SOME NOTES ON JOHNSON BOUND AND GRAHAM BOUND OF CONSTANT WEIGHT CODES
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摘要: 本文给出了四类达到约翰逊上界的等重码和两类超过格雷厄姆下界的等重码。
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Abstract: Four classes of constant weight codes which can meet the Johnson upper bound and two classes of constant weight codes which are greater than the Graham lower bound are given in this paper. -
S.M. Johnson, IRE Trans. on-IT, IT-18 (1962),203.[2]R. L. Graham, IEEE Trans. on-IT, IT-26(1980),37.[3]胡正明,通信学报,1985年,第2期,第44页.[4]M. Hall Jr., Combinatorial Theory, Blaisdell, Waltham, Mass, p. 141, pp. 232-233. -
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