Power Efficient MISO Caching with Practical Subpacketization via User Scheduling

Soheil Mohajer, Itsik Bergel

Research output: Contribution to journalArticlepeer-review

Abstract

We present a novel power-efficient and low-complexity scheme for cache-aided communication in networks with a multi-antenna base station that serves multiple single-antenna users. The scheme is based on transmitting coded messages to disjoint groups of users simultaneously and achieves an important trade-off between performance and complexity. The subpacketization level of the proposed scheme is sub-optimum compared to the state-of-the-art but is still feasible for a practical range of network parameters. On the other hand, the scheme achieves near-optimal performance and asymptotically achieves the same degrees of freedom (DoF) as the best-known schemes achieve. However, compared to other optimum achievable rates, the proposed scheme suffers from minor performance degradation due to power loss, which becomes negligible as the signal-to-noise ratio or the number of users grows. In return, the reductions in complexity and subpacketization allow for practical implementation of this scheme even for a large number of users. The presented scheme is also very flexible to the variation of the network topology and can easily be generalized to heterogeneous and dynamic scenarios.

Original languageEnglish
Pages (from-to)6482-6497
Number of pages16
JournalIEEE Transactions on Wireless Communications
Volume23
Issue number6
StatePublished - 1 Jun 2024

Bibliographical note

Publisher Copyright:
© 2002-2012 IEEE.

Keywords

  • Cache-aided communication
  • MISO
  • power efficiency
  • subpacketization level

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