Abstract
By analytically showing that index coding (IC) is more power efficient than superposition coding (SC) when appropriate caching contents are available for a pair of users, we propose a sub-optimal joint user clustering and power allocation scheme for a single-cell downlink non-orthogonal multiple access network with caching memory at the receivers that alternate between IC and SC. Simulation studies demonstrate that the proposed scheme significantly reduces the transmission power when compared with the benchmark scheme that only allows SC.
| Original language | English |
|---|---|
| Article number | 8610284 |
| Pages (from-to) | 478-481 |
| Number of pages | 4 |
| Journal | IEEE Communications Letters |
| Volume | 23 |
| Issue number | 3 |
| Early online date | 11 Jan 2019 |
| DOIs | |
| Publication status | Published - Mar 2019 |
| Externally published | Yes |
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Keywords
- Caching
- NOMA
- index coding (IC)
- optimal power control
- superposition coding (SC)
- user clustering
ASJC Scopus subject areas
- Modelling and Simulation
- Computer Science Applications
- Electrical and Electronic Engineering