Bounds and constructions of optimal optical orthogonal codes with low correlation zone
Bounds and constructions of optimal optical orthogonal codes with low correlation zone
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低相关区最优光正交码的界限和构造
DOI:
10.1007/s11432-018-9747-5
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发表时间:
2019-05
期刊:
影响因子:
--
通讯作者:
Xu Chengqian
中科院分区:
文献类型:
--
作者:
Xu Chengqian
Dear editor, In optical code division multiple access (CDMA) systems, optical orthogonal codes (OOC) should exhibit the following correlations to reduce multiple access interference: the non-trivial correlation between a sequence and its shift sequence and the correlation between sequence and shift sequence of other sequences should be as low as possible [1, 2]. Herein, the shift values of a sequence are randomly distributed throughout the sequence period. In quasi-synchronous CDMA systems, the time delay of the system is not very large and is generally distributed only in areas smaller than the sequence period. The purpose of reducing multiple access interference can be achieved using an address code that has a very small correlation function in the zone near zero. Therefore, a two-dimensional optical orthogonal code with zero cross-correlation zone is introduced [3].In this study, the concept of optical orthogonal code with low correlation zone (LCZ) is proposed, the theoretical bounds on the code including sequence length, sequence weight, sequence set size, sequence correlation, and LCZ length are derived, and two methods of constructing OOCs with LCZ are given.
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