University of Oulu

M. Bande, V. V. Veeravalli, A. Tölli and M. Juntti, "DoF analysis in a two-layered heterogeneous wireless interference network," 2017 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), New Orleans, LA, 2017, pp. 3749-3753. doi: 10.1109/ICASSP.2017.7952857

DoF analysis in a two-layered heterogeneous wireless interference network

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Author: Bande, Meghana1; Veeravalli, Venugopal V.1; Tölli, Antti2;
Organizations: 1ECE Department and CSL University of Illinois at Urbana-Champaign
2Centre for Wireless Communication, University of Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1.1 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2018080133230
Language: English
Published: Institute of Electrical and Electronics Engineers, 2017
Publish Date: 2018-08-01
Description:

Abstract

Degrees of freedom (DoF) is studied in the downlink of a heterogenous wireless network modeled as a two-layered interference network. The first layer of the interference network is the backhaul layer between macro base stations (MBs) and small cell base stations (SBs), which is modeled as a Wyner type linear network. The second layer is the transmission layer between SBs and mobile terminals (MTs), which is modeled as a linear Wyner LT network. The SBs are assumed to be half-duplex, thus restricting the per user degrees of freedom (puDoF) in the system to 1/2. It is established that the optimal puDoF of 1/2 can be achieved in the linear network with sufficient number of antennas using only interference avoidance schemes. For the case of higher connectivity in the transmission layer, it is shown that the optimal puDoF is achieved by sending an appropriate linear combination to the SB to zero-force interference at the intended user. These results are also extended to a more realistic hexagonal cellular model.

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Series: Proceedings of the IEEE International Conference on Acoustics, Speech and Signal Processing
ISSN: 1520-6149
ISSN-E: 2379-190X
ISSN-L: 1520-6149
ISBN: 978-1-5090-4117-6
ISBN Print: 978-1-5090-4118-3
Pages: 3749 - 3753
DOI: 10.1109/ICASSP.2017.7952857
OADOI: https://oadoi.org/10.1109/ICASSP.2017.7952857
Host publication: 2017 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)
Conference: IEEE international conference on acoustics, speech and signal processing
Type of Publication: A4 Article in conference proceedings
Field of Science: 213 Electronic, automation and communications engineering, electronics
Subjects:
Funding: his research was supported in part by the US NSF WiFiUS program under grant CNS 14-57168, through the University of Illinois at Urbana-Champaign, and by the Academy of Finland under grant 284801.
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