Two key traits of 5G cellular networks are much higher base station (BS) densities-especially
in the case of low-power BSs-and the use of massive MIMO at these BSs. This paper …

The nested array, implemented by nonuniform antenna placement, is an effective approach
to achieve O (N 2) degrees of freedom (DOF) with an antenna array of N antennas. Such …

Massive multiple-input-multiple-output (MIMO) and small cell are both recognized as key
technologies for the future fifth-generation wireless systems. In this paper, we investigate the …

Although the massive MIMO enabled heterogeneous networks (HetNets) can intensify the
spectral efficiency benefits, the proper user association and resource allocation are both …

With increasing cell density and the heterogeneity in the network, optimal user-cell
association which is a well known open problem, will become an even more challenging …

In this paper, we investigate the resource allocation problem in two-tier heterogenous
networks (HetNets) with massive MIMO, where two frequency bands, cellular frequency …

In this paper, we study the downlink performance of a heterogeneous cellular network
(HetNet) where both macro and small cells share the same spectrum and hence interfere …

We investigate the heterogeneous cellular network (HetNet) where the macrocell base
stations (MBSs) are equipped with very large antenna arrays. Since such a combined …

In this paper, we propose a general framework to study the tradeoff between energy
efficiency (EE) and spectral efficiency (SE) in massive multiple-input-multiple-output …

We consider a heterogeneous cellular network (HetNet) where a macrocell tier with a large
antenna array base station (BS) is overlaid with a dense tier of small cells (SCs). We …