Imperial College London
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ProfessorDenizGunduz

Faculty of Engineering, Department of Electrical and Electronic Engineering

Professor in Information Processing
 
 
 
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Contact

 

+44 (0)20 7594 6218d.gunduz Website

 
 
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Assistant

 

Ms Joan O'Brien +44 (0)20 7594 6316

 
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Location

 

1016Electrical EngineeringSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Zhao:2020:10.1109/TWC.2020.3012016,
author = {Zhao, J and Mohammadi, Amiri M and Gunduz, D},
doi = {10.1109/TWC.2020.3012016},
journal = {IEEE Transactions on Wireless Communications},
pages = {7484--7497},
title = {Multi-antenna coded content delivery with caching: a low-complexity solution},
url = {http://dx.doi.org/10.1109/TWC.2020.3012016},
volume = {19},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We study downlink beamforming in a single-cellnetwork with a multi-antenna base station serving cache-enabledusers. Assuming a library of files with a common rate, we formulate the minimum transmit power with proactive caching andcoded delivery as a non-convex optimization problem. While thismultiple multicast problem can be efficiently solved by successiveconvex approximation (SCA), the complexity of the problemgrows exponentially with the number of subfiles delivered toeach user in each time slot, which itself grows exponentially withthe number of users. We introduce a low-complexity alternativethrough time-sharing that limits the number of subfiles receivedby a user in each time slot. We then consider the joint design ofbeamforming and content delivery with sparsity constraints tolimit the number of subfiles received by a user in each time slot.Numerical simulations show that the low-complexity scheme hasonly a small performance gap to that obtained by solving the jointproblem with sparsity constraints, and outperforms state-of-theart results at all signal-to-noise ratio (SNR) and rate values witha sufficient number of transmit antennas. A lower bound onthe achievable degrees-of-freedom (DoF) of the low-complexityscheme is derived to characterize its performance in the highSNR regime.
AU  - Zhao,J
AU  - Mohammadi,Amiri M
AU  - Gunduz,D
DO  - 10.1109/TWC.2020.3012016
EP  - 7497
PY  - 2020///
SN  - 1536-1276
SP  - 7484
TI  - Multi-antenna coded content delivery with caching: a low-complexity solution
T2  - IEEE Transactions on Wireless Communications
UR  - http://dx.doi.org/10.1109/TWC.2020.3012016
UR  - https://ieeexplore.ieee.org/document/9154573
UR  - http://hdl.handle.net/10044/1/81549
VL  - 19
ER  -
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