Multi-Antenna Interference Management for Coded Caching
| Autor: | Babak Hossein Khalaj, Jarkko Kaleva, Antti Tolli, Seyed Pooya Shariatpanahi |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
FOS: Computer and information sciences
Beamforming Multicast Computer science Information Theory (cs.IT) Computer Science - Information Theory Applied Mathematics degrees-of-freedom multicast beamforming 020206 networking & telecommunications Data_CODINGANDINFORMATIONTHEORY 02 engineering and technology Interval (mathematics) Degrees of freedom (mechanics) Topology Noise (electronics) Computer Science Applications Base station beamformer design 0202 electrical engineering electronic engineering information engineering Resource allocation coded caching interference management Electrical and Electronic Engineering Multi-antenna communications |
| Zdroj: | IEEE Transactions on Wireless Communications. 19:2091-2106 |
| ISSN: | 1558-2248 1536-1276 |
| DOI: | 10.1109/twc.2019.2962686 |
| Popis: | A multi-antenna broadcast channel scenario is considered where a base station delivers contents to cache-enabled user terminals. A joint design of coded caching (CC) and multigroup multicast beamforming is proposed to benefit from spatial multiplexing gain, improved interference management and the global CC gain, simultaneously. The developed general content delivery strategies utilize the multiantenna multicasting opportunities provided by the CC technique while optimally balancing the detrimental impact of both noise and inter-stream interference from coded messages transmitted in parallel. Flexible resource allocation schemes for CC are introduced where the multicast beamformer design and the receiver complexity are controlled by varying the size of the subset of users served during a given time interval, and the overlap among the multicast messages transmitted in parallel, indicated by parameters $\alpha$ and $\beta$, respectively. Degrees of freedom (DoF) analysis is provided showing that the DoF only depends on $\alpha$ while it is independent of $\beta$. The proposed schemes are shown to provide the same degrees-of-freedom at high signal-to-noise ratio (SNR) as the state-of-art methods and, in general, to perform significantly better, especially in the finite SNR regime, than several baseline schemes. Comment: version 3: 16 pages, 8 figures, all the simulation codes available at: https://github.com/kalesan/sim-cc-miso-bc. Published in IEEE Transactions on Wireless Communications |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|