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Coded caching schemes with low subpacketization and small transmission rateare desirable in practice due to the requirement of low implementationcomplexity and efficiency of the transmission. Placement delivery arrays (PDAin short) can be used to generate coded caching schemes. However, many knowncoded caching schemes have large memory ratios. In this paper, we realize thatsome schemes with low subpacketization generated by PDAs do not fully use theusers' caching content to create multicasting opportunities and thus propose toovercome this drawback. As an application, we obtain two new schemes with lowsubpacketizations, which have significantly advantages on the memory ratio andtransmission rate compared with the original scheme.

New coded caching schemes from placement delivery arrays