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Uplink Interference Management for Coexisting MIMO Femtocell and Macrocell Networks: An Interference Alignment Approach | IEEE Journals & Magazine | IEEE Xplore

Uplink Interference Management for Coexisting MIMO Femtocell and Macrocell Networks: An Interference Alignment Approach


Abstract:

This paper considers uplink interference management for two-tier cellular systems by way of Interference Alignment (IA). In order to manage the uplink interference caused...Show More

Abstract:

This paper considers uplink interference management for two-tier cellular systems by way of Interference Alignment (IA). In order to manage the uplink interference caused by macrocell users at the femtocell base stations (FBS), cooperation between macrocell users with the closest femtocell base stations is proposed with the goal of aligning the received signals of macrocell users in the same subspace at multiple FBSs. The precoder design for macrocell users is accomplished using successive semidefinite programming relaxations. The proposed solution aims to minimize the cross-tier interference leaked to the femtocells while providing the macrocell users with a minimum received signal to interference plus noise ratio (SINR) at the macrocell base station (MBS). Intra-tier femtocell interference is dealt with minimum mean squared error (MMSE) interference suppression. Numerical results demonstrate that the proposed two-tier interference management approach improves the performance of femtocell users, while maintaining the desired quality of the communication channel of macrocell users.
Published in: IEEE Transactions on Wireless Communications ( Volume: 13, Issue: 4, April 2014)
Page(s): 2246 - 2257
Date of Publication: 07 March 2014

ISSN Information:


I. Introduction

Next generation wireless networks are expected to provide a diverse range of broadband services to meet subscriber demands. Femtocells are a promising direction to improve the performance for in-home users while reducing the load on the cellular (macrocell) network [1]. Femtocells require no infrastructure as they are plug-and-play devices that are connected to the internet backhaul [2]. A main deployment challange is that femtocells operate in the licenced band, and consequently have to share the radio resources and coexist with the cellular network. Solutions proposed to guarantee coexistence range from partitioning the frequency resources between the two networks with closed access, to allowing cellular (macrocell) users to be served by femtocell base stations with open access [1].

References

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