Effect of Unpredictable Interference on MU-MIMO Systems in HetNet

Lee, Seok-Won; Kim, Seokjung; Park, Yosub; Choi, Sooyong; Hong, Daesik

doi:10.1109/access.2017.2778274

Cited by 5 publications

(3 citation statements)

References 21 publications

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“…With the goal of improving the performance of HetNets, MU-MIMO technology has been employed. Due to its extremely high spectral efficiency, MU-MIMO has received a significant attention [9][10][11]. In the 3rd Generation Partnership Project (3GPP) Long-Term Evolution-Advanced (LTE-A) [12] and IEEE 802.11ac [13], the MU-MIMO has been adopted.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of MU-MIMO Transmissions with Joint Interference Constraint in HetNet

Zhang

Jiang

2021

Mathematical Problems in Engineering

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In this paper, we investigate the per-tier outage probability of multiuser multiple-input multiple-output (MU-MIMO) transmissions in heterogeneous networks (HetNets) with joint interference constraint. In the tier of cellular cell, user equipment (UE) is required to report measured channel information and the base station (BS) adopts ZF-based precoding MU-MIMO transmission to achieve multiuser diversity gain. With the constraint of cross-tier interference and unpredicted inter-beam interference, we derive the closed-form expression of outage probability of downlink MU-MIMO transmissions. Considering the capacity of nodes in the tier of ad hoc networks, a max-SINR scheduler and codebook-based MU-MIMO transmission are employed. The scheduler selects the best receiving nodes for each beam in predefined codebook according to measured signal to interference plus noise ratio (SINR), and the transmitting node performs data transmissions using orthogonal beams. In the presence of inter-node interference, inter-beam interference, and cross-tier interference, we obtain the closed-form expression of outage probability of MU-MIMO transmissions when downlink or uplink transmissions occur in cellular cell. Additionally, in case that the outage probability in ad hoc networks should satisfy quality of service (QoS) requirement, a restricted area in cellular cell in which the outage probability in ad hoc networks is not greater than a required threshold is explored. Numerical results show that the unpredictable inter-beam interference in cellular cell degrades the outage probability slightly. The restricted area increases with the outage probability threshold.

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Section: Introductionmentioning

confidence: 99%

Performance Evaluation of MU-MIMO Transmissions with Joint Interference Constraint in HetNet

Zhang

Jiang

2021

Mathematical Problems in Engineering

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“…Because of the scarcity of spectrum resource, the Het-Nets usually share the same channels. Without the coordination between two-tier networks, the cross-tier interference is caused to each other inevitably [6]. The user equipment (UE) in cellular networks and the receiving nodes in ad hoc networks suffer the cross-tier interference signal.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Compact Boundary of Outage Probability in HetNet

Jiang

Zhang

2021

Wireless Communications and Mobile Computing

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In this paper, we investigate the outage probability of per-tier in heterogeneous networks (HetNet) in the presence of aggregated interference from coexisting ad hoc networks. In ad hoc networks, a receiving node suffers the cross-tier interference signal from cellular cell and aggregated interference signal from other transmitting nodes. In order to evaluate the effect of cross-tier interference on the outage probability of ad hoc networks, we analyze the restricted region in cellular cell that the received signal interference noise ratio (SINR) of a receiving node does not exceed the SINR threshold considering the path loss model. Further, to evaluate the effect of aggregated interference of ad hoc networks, we divide the plane area into near-field area and far-field area according to whether the signal of a transmitting node could cause an outage independently or not. Based on this division, we derive the compact lower and upper boundaries of outage probability of per-tier. The computer simulations validate the results of theoretical analysis and show the effect of different factors, such as transmit power, intensity of ad hoc nodes, on the outage probability.

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“…Moreover, the advent of next generation 5G communication systems implies the use of ultra-dense small cells in order to increase coverage/capacity requirements inherent to the wide array of services to be offered [11]. In this context, multiple wireless communication systems can be employed in order to diversify service provision, leading to issues such as unpredictable interference sources, or idle cell interference which can greatly impact quality of service [12,13]. Interference analysis has also been considered as a potentially beneficial evaluation element that can be employed in order to enable covert communications in IoT scenarios [14].…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation and Interference Characterization of Wireless Sensor Networks for Complex High-Node Density Scenarios

Celaya-Echarri

Azpilicueta

López-Iturri

et al. 2019

Sensors

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The uncontainable future development of smart regions, as a set of smart cities’ networks assembled, is directly associated with a growing demand of full interactive and connected ubiquitous smart environments. To achieve this global connection goal, large numbers of transceivers and multiple wireless systems will be involved to provide user services and applications anytime and anyplace, regardless the devices, networks, or systems they use. Adequate, efficient and effective radio wave propagation tools, methodologies, and analyses in complex indoor and outdoor environments are crucially required to prevent communication limitations such as coverage, capacity, speed, or channel interferences due to high-node density or channel restrictions. In this work, radio wave propagation characterization in an urban indoor and outdoor wireless sensor network environment has been assessed, at ISM 2.4 GHz and 5 GHz frequency bands. The selected scenario is an auditorium placed in an open free city area surrounded by inhomogeneous vegetation. User density within the scenario, in terms of inherent transceivers density, poses challenges in overall system operation, given by multiple node operation which increases overall interference levels. By means of an in-house developed 3D ray launching (3D-RL) algorithm with hybrid code operation, the impact of variable density wireless sensor network operation is presented, providing coverage/capacity estimations, interference estimation, device level performance and precise characterization of multipath propagation components in terms of received power levels and time domain characteristics. This analysis and the proposed simulation methodology, can lead in an adequate interference characterization extensible to a wide range of scenarios, considering conventional transceivers as well as wearables, which provide suitable information for the overall network performance in crowded indoor and outdoor complex heterogeneous environments.

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Effect of Unpredictable Interference on MU-MIMO Systems in HetNet

Cited by 5 publications

References 21 publications

Performance Evaluation of MU-MIMO Transmissions with Joint Interference Constraint in HetNet

Performance Evaluation of MU-MIMO Transmissions with Joint Interference Constraint in HetNet

Evaluation of Compact Boundary of Outage Probability in HetNet

Performance Evaluation and Interference Characterization of Wireless Sensor Networks for Complex High-Node Density Scenarios

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