NDLI: Interference cancellation in HetNet uplink with and without MU-CSIR: a subspace-based approach

Content Provider	IET Digital Library
Author	Najlah, C. P. Sameer, S. M.
Abstract	One of the prime concerns regarding multi-tier architecture in heterogeneous networks (HetNets) is the interference between users in macrocells and femtocells. Interference mitigation (IM) in femtocells is of critical importance due to high power interfering signals from macrocells. However, such IM techniques generally demand intensive signalling overhead that adversely affect the benefits of multi-tier network architecture. A novel interference cancellation technique with very low signalling overhead that does not require global channel state information at the transmitter is proposed in this study for the uplink of HetNets. The proposed subspace nulling (SN)-based method projects the composite received signal onto the intersection space of the left null space of the interfering space and the row space of desired space to cancel the cross-tier interference. This is achieved both in the presence and absence of macrocell user channel state information at receiver (MU-CSIR). The authors also propose a low complexity subspace method that works with the knowledge of MU-CSIR. Exhaustive simulation studies show that the proposed schemes fully cancel the cross-tier interference in femtocell tier resulting in better bit error rate performance for the FU receiver.
Starting Page	1113
Ending Page	1119
Page Count	7
ISSN	17518628
Volume Number	14
e-ISSN	17518636
Issue Number	Issue 7, Apr (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/14/7
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2019.0726
Journal	IET Communications
Publisher Date	2020-01-09
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Composite Received Signal Cross-tier Interference Desired Space Electromagnetic Compatibility Error Statistics Femtocell Tier Femtocellular Radio Global Channel State Information Heterogeneous Network HetNet Uplink High Power Interfering Signal IM Technique Intensive Signalling Overhead Interference Interference Cancellation Technique Interference Mitigation Interference Suppression Interfering Space Intersection Space Left Null Space Low Complexity SubSpace Method Low Signalling Overhead Macrocell User Channel State Information Mobile Radio System MU-CSIR Multitier Architecture Multitier Network Architecture Radio Frequency Interference Row Space Statistics SubSpace Nulling-based Method SubSpace-based Approach Telecommunication Signalling Wireless Channel
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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