期刊
IEEE TRANSACTIONS ON COMMUNICATIONS
卷 69, 期 12, 页码 7974-7985出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCOMM.2021.3116229
关键词
Coded caching; PDAs; sub-packetization
资金
- Science and Engineering Research Board (SERB) of Department of Science and Technology (DST), Government of India [DOI: 10.1109/ISIT45174.2021.9518223]
In this paper, we focus on a specific class of multi-access coded caching problem and construct new Placement Delivery Arrays (PDAs) to achieve higher coding gain and lower transmission rate. The proposed scheme shows improved performance compared to existing schemes, with a linear increase in sub-packetization level with the number of users.
We consider multi-access coded caching problem introduced by Hachem et.al., where each user has access to L neighboring caches in a cyclic wrap-around fashion. We focus on the deterministic schemes for a specific class of multi-access coded caching problem based on the concept of Placement Delivery Array (PDA). We construct new PDAs which specify the delivery scheme for the specific class of multi-access coded caching problem discussed in this paper. For the proposed scheme, the coding gain is larger than that of the state-of-the-art for some regimes while the sub-packetization level varies only linearly with the number of users. Hence, we achieve a lower transmission rate with the least sub-packetization level compared to the existing schemes.
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