Tran, Ha-Vu, Kaddoum, Georges, Tran, Hung and Hong, Een Kee.
2017.
« Downlink power optimization for heterogeneous networks with time reversal-based transmission under backhaul limitation ».
IEEE Access, vol. 5.
pp. 755-770.
Compte des citations dans Scopus : 11.
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Kaddoum G. 2017 15108 Downlink power optimization for.pdf - Published Version Use licence: All rights reserved to copyright holder. Download (5MB) | Preview |
Abstract
In this paper, we investigate an application of two different beamforming techniques and propose a novel downlink power minimization scheme for a two-tier heterogeneous network (HetNet) model. In this context, we employ the time reversal (TR) technique to a femtocell base station, whereby we assume that a macrocell base station uses a zero-forcing-based algorithm, and the communication channels are subject to frequency selective fading. Additionally, the HetNet backhaul connection is unable to support a sufficient throughput for signaling an information exchange between two tiers. Given the considered HetNet model, a downlink power minimization scheme is proposed, and closed-form expressions concerning the optimal solution are provided by taking this constraint into account. Furthermore, considering imperfect channel estimation at TR-employed femtocell, a worst-case robust power minimization problem is formulated. By devising TR worst-case analysis, this robust problem is transformed into an equivalent formulation that is tractable to solve. The results presented in our paper, show that the TR technique outperforms the zero-forcing one from the perspective of beamforming methods for femtocell working environments. Finally, we validate the proposed power loading strategy for both cases of perfect and imperfect channel estimations.
| Item Type: | Peer reviewed article published in a journal |
|---|---|
| Uncontrolled Keywords: | Fonds d'auteur ÉTS, FAETS |
| Professor: | Professor Kaddoum, Georges |
| Affiliation: | Génie électrique |
| Date Deposited: | 20 Apr 2017 17:42 |
| Last Modified: | 22 Jan 2020 19:58 |
| URI: | https://espace2.etsmtl.ca/id/eprint/15108 |
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