期刊
IEEE TRANSACTIONS ON COMMUNICATIONS
卷 68, 期 3, 页码 1881-1896出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCOMM.2019.2960503
关键词
Coded caching; wireless caching; linear degrees-of-freedom; parallel channels; hybrid CSIT
资金
- U.K. EPSRC [EP/N015312/1, EP/R511547/1]
- EPSRC [EP/N015312/1] Funding Source: UKRI
We consider the problem of cache-aided interference management in a network consisting of K-T single-antenna transmitters and K-R single-antenna receivers, where each node is equipped with a cache memory. Transmitters communicate with receivers over two heterogenous parallel subchannels: the P-subchannel for which transmitters have perfect instantaneous knowledge of the channel state, and the N-subchannel for which the transmitters have no knowledge of the instantaneous channel state. Under the assumptions of uncoded placement and separable one-shot linear delivery over the two subchannels, we characterize the optimal degrees-of-freedom (DoF) to within a constant multiplicative factor of 2. We extend the result to a decentralized setting in which no coordination is required for content placement at the receivers. In this case, we characterize the optimal one-shot linear DoF to within a factor of 3.
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