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Massive MIMO for interference management in heterogeneous networks

: Dommel, J.; Knust, P.-P.; Thiele, L.; Haustein, T.


Institute of Electrical and Electronics Engineers -IEEE-:
IEEE 8th Sensor Array and Multichannel Signal Processing Workshop, SAM 2014 : A Coruña, Spain, 22 - 25 June 2014
Piscataway, NJ: IEEE, 2014
ISBN: 978-1-4799-1480-7
ISBN: 978-1-4799-1481-4
Sensor Array and Multichannel Signal Processing Workshop (SAM) <8, 2014, A Coruña>
Fraunhofer HHI ()

In this paper, a spatial interference coordination scheme for a typical macro/small-cell overlay scenarios is proposed which protects small-cell user equipments (UEs) from macro-cell interference and has potential applications in massive multiple-input multiple-output (MIMO) deployments. We assume the macro base stations (BSs) to be equipped with a large number of transmit antennas which are employed to reduce interference towards small-cell users by means of spatial transmit processing. Uncoordinated spatial multiplexing (SMUX) per access point (AP) is considered as a baseline, i.e. the macro BS uses zero-forcing (ZF)-based block diagonalization (BD) [1] to serve their user without taking interference towards small-cell UEs into account. The proposed method considers a joint BD/interference-alignment (IA) - approach to calculate the macro pre-coder and reduces the dimension of the interference sub-space for small-cell UEs without destroying the orthogonality of the macro BD. It results, that the the interference can be reduced even if the number of protected small-cell UEs exceeds the number of free spatial dimensions at the macro BS.