Interference Management Using Beamforming Techniques for Line-of-Sight Femtocell Networks

Khalid Sheikhidris MOHAMED  Mohamad Yusoff ALIAS  Mardeni ROSLEE  

IEICE TRANSACTIONS on Communications   Vol.E103-B    No.8    pp.881-887
Publication Date: 2020/08/01
Publicized: 2020/01/24
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2019EBP3172
Type of Manuscript: PAPER
Category: Terrestrial Wireless Communication/Broadcasting Technologies
femtocell,  interference mitigation,  beamforming,  spectral efficiency,  outage probability,  

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Femtocell structures can offer better voice and data exchange in cellular networks. However, interference in such networks poses a major challenge in the practical development of cellular communication. To tackle this issue, an advanced interference mitigation scheme for Line-Of-Sight (LOS) femtocell networks in indoor environments is proposed in this paper. Using a femtocell management system (FMS) that controls all femtocells in a service area, the aggressor femtocells are identified and then the transmitted beam patterns are adjusted using the linear array antenna equipped in each femtocell to mitigate the interference contribution to the neighbouring femtocells. Prior to that, the affected users are switched to the femtocells that provide better throughput levels to avoid increasing the outage probability. This paper considers different femtocell deployment indexes to verify and justifies the feasibility of the findings in different density areas. Relative to fixed and adaptive power control schemes, the proposed scheme achieves approximately 5% spectral efficiency (SE) improvement, about 10% outage probability reduction, and about 7% Mbps average user throughput improvement.