Interference mitigation by practical transmit beamforming methods in closed femtocells

Authors:
Mika Husso;Jyri Hämäläinen;Riku Jäntti;Juan Li;Edward Mutafungwa;Risto Wichman;Zhong Zheng;Alexander M. Wyglinski
Affiliations:
Department of Communications and Networking, Helsinki University of Technology, Espoo, Finland;Department of Communications and Networking, Helsinki University of Technology, Espoo, Finland;Department of Communications and Networking, Helsinki University of Technology, Espoo, Finland;Department of Communications and Networking, Helsinki University of Technology, Espoo, Finland;Department of Communications and Networking, Helsinki University of Technology, Espoo, Finland;Department of Communications and Networking, Helsinki University of Technology, Espoo, Finland;Department of Communications and Networking, Helsinki University of Technology, Espoo, Finland;Department of Electrical and Computer Engineering, Worcester Polytechnic Institute, Worcester, MA
Venue:
EURASIP Journal on Wireless Communications and Networking - Special issue on femtocell networks
Year:
2010

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Abstract

We present an analysis of a femtocellular communications network and the impact of cochannel interference on link performance. Furthermore, we propose a method whereby user terminals can maintain a controlonly connection to an adjacent femtocell for interference mitigation purposes. Specifically, we provide an emphasis on suboptimal but practical methods that rely on transmit beamforming. Our numerical results demonstrate that even simple multiantenna methods can be effectively used to suppress co-channel interference provided that control channel connection between interfering femto-base station and user terminal is allowed.