Bounds and constructions of optimal optical orthogonal codes with low correlation zone

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2019,（10）
• 页码范围: 210-212
• 页数: 3页
• 语种: 英文

摘要

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].