Centralized and decentralized cache-aided interference management in heterogeneous parallel channels

Enrico Piovano, Hamdi Joudeh, Bruno Clerckx (Corresponding author)

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

Samenvatting

We consider the problem of cache-aided interference management in a network consisting of KT single-antenna transmitters and KR 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.

Originele taal-2Engels
Artikelnummer8936332
Pagina's (van-tot)1881-1896
Aantal pagina's16
TijdschriftIEEE Transactions on Communications
Volume68
Nummer van het tijdschrift3
DOI's
StatusGepubliceerd - mrt 2020
Extern gepubliceerdJa

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