Vertical Sectorization Techniques in MISO Downlink Active Antenna Systems

Abstract

In this paper, we study vertical sectorization techniques in multiple-input single-output (MISO) downlink active antenna systems (AAS). In the AAS, antenna beam patterns can be adjusted in each sector and multiple vertical beams can form the vertical sectorization. Since an exhaustive search based vertical sectorization algorithm requires high computational complexity to find the optimal tilt angles, we propose two vertical sectorization algorithms to reduce the complexity. First, we provide an asymptotic sum rate based algorithm which utilizes a large system approximation of the average sum rate based on the random matrix theory. Next, by using the result in the single sector transmission, the single sector based algorithm is proposed. In the simulation results, we confirm that the proposed algorithms are close to the performance of the exhaustive search algorithm with much reduced complexity.

Interplay between vertical sectorization and user distribution for urban NB-IoT networks

“…The conditional CDF expression of K(φ tilt ) n,1 n,2 + ω for given h n,1 and h n,2 can be obtained from (11) such that…”

“…While the vertical sectorization has been extensively studied for the downlink (DL) transmission [10], [11], there is only a few studies available for the uplink (UL) transmission [12], [13]. Further, the existing UL studies failed to address the IoT point of view whereas UL coverage with acceptable rates for a required number of supported connections is an essential part of network design for low-power IoT service provision.…”

“…The corresponding parameter values used for logistic distribution-based PDF approximation given in(11) for different φ tilt values.…”

3D Beamforming Techniques in Multi-Cell MISO Downlink Active Antenna Systems for Large Data Transmission

“…With this result, the author in [13] has founded the two optimal tilting angles of the vertical sectors in a cell.…”

MMSE Based Nonlinear Precoding for Multiuser MIMO Broadcast Channels with Inter-Cell Interference

“…Also, in [3], a successive zero-forcing DPC (SZFDPC) scheme has been introduced as a generalization of the ZFDPC for the multiuser MIMO case [4] . In this paper, we consider multi-cell multiuser MIMO networks where users experience interference from neighboring cells [5][6][7] . In this environment, the performance of the schemes in [1] and [3] can be degraded significantly due to other cell interference (OCI), since these ZF based schemes identify the multiuser interference (MUI) suppressing precoder without considering the OCI and noise.…”