scholarly journals Performance Analysis of Group Selection in UAV Networks with Backhaul-Aware Biasing

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Shusheng Wang ◽  
Yuanyuan Du ◽  
Hongtao Zhang
Keyword(s):  
Outage Probability ◽  
System Performance ◽  
Stochastic Geometry ◽  
Group Selection ◽  
Reference Signal ◽  
Cell Group ◽  
Cell Selection ◽  
Wireless Backhaul ◽  
Bias Factor ◽  
Major Bottleneck

The limited wireless backhaul capacity has become the major bottleneck for UAV communications, while in existing researches of UAV networks, the relation between cell selection and backhaul capacity has not been modeled. This paper proposes cell group selection with backhaul-aware biasing for UAV networks and analyzes system performance by deriving the rate outage probability via stochastic geometry, where the user’s maximum data rate is constrained by backhaul capacity. Specifically, cell group selection is no longer distance-based and considered with backhaul capacity bias factor, where UAVs with higher backhaul capacity will have a larger bias factor to match the backhaul variance. In addition, the dynamic UAV group is organized with the N largest bias reference signal receiving power (BRSRP), where users can utilize the diversity gain by adjusting serving UAV dynamically as the channel conditions change. Analytical results show that the outage probability is decreased by 58% when cell group size N = 3 and UAV optimal density λ u = 600 / k m 2 when UAV height h = 150   m .

scholarly journals Adaptive Multi-state Millimeter Wave Cell Selection Scheme for 5G communication

2018 ◽  
Vol 8 (5) ◽  
pp. 2967 ◽  
Author(s):  
Mothana L Attiah ◽  
Azmi Awang Md Isa ◽  
Zahriladha Zakaria ◽  
Nor Fadzilah Abdullah ◽  
Mahamod Ismail ◽  
...  
Keyword(s):  
Outage Probability ◽  
Millimeter Wave ◽  
System Performance ◽  
Path Loss ◽  
Rain Attenuation ◽  
Mobile User ◽  
Base Stations ◽  
Target Area ◽  
Cell Selection ◽  
Selection Scheme

<p>Millimeter wave bands have been introduced as one of the most promising solutions to alleviate the spectrum secrecy in the upcoming future cellular technology (5G) due the enormous amount of raw bandwidth available in these bands. However, the inherent propagation characteristics of mmWave frequencies could impose new challenges i.e. higher path loss, atmospheric absorption, and rain attenuation which in turn increase the outage probability and hence, degrading the overall system performance. Therefore, in this paper, a novel flexible scheme is proposed namely Adaptive Multi-State MmWave Cell Selection (AMSMC-S) through adopting three classes of mmWave base stations, able to operate at various mmWave carrier frequencies (73, 38 and 28 GHz). Two mmWave cellular Grid-Based cell deployment scenarios have been implemented with two inter-site-distances 200 m and 300 m, corresponding to target area of (2.1 km2) and (2.2 km2). The maximum SINR value at the user equipment (UE) is taken in to consideration to enrich the mobile user experience. Numerical results show an improvement of overall system performance, where the outage probability reduced significantly to zero while maintaining an acceptable performance of the 5G systems with approximately more than 50% of the mobile stations with more than 1Gbps data rate. </p>

Stochastic Geometry Analysis of Wireless Backhaul Networks with Beamforming in Roadside Environments

2021 ◽  
Vol E104.B (1) ◽  
pp. 118-127
Author(s):  
Yuxiang FU ◽  
Koji YAMAMOTO ◽  
Yusuke KODA ◽  
Takayuki NISHIO ◽  
Masahiro MORIKURA ◽  
...  
Keyword(s):  
Stochastic Geometry ◽  
Wireless Backhaul ◽  
Backhaul Networks ◽  
Geometry Analysis

Development of Solar-Powered Microcontroller-Relay-Based Control System Omnidirectional Wheelchair

2021 ◽  
pp. 181-191
Author(s):  
Patrick Uche Okafor ◽  
Ndidi Stella Arinze ◽  
Osondu Ignatius Onah ◽  
Ebenezer Nnajiofo Ogbodo
Keyword(s):  
Power Supply ◽  
System Performance ◽  
Performance Test ◽  
Reference Signal ◽  
Control Mechanisms ◽  
Solar Module ◽  
Dc Motors ◽  
Solar Powered ◽  
Physically Challenged ◽  
Test Result

A solar-powered omnidirectional wheelchair is implemented for physically challenged persons. The framework was mounted on the wheels that were connected with two direct current (DC) motors. The ratings of the battery and solar module were determined using system voltage (12V). A 7,805-voltage regulator was used to supply 5VDC to the AT89352 microcontroller. The microcontroller was programmed to provide a reference signal to the motor. The motor provides the needed torque to drive the wheels through interconnected relays. The relays are energized by the microcontroller and omnidirectional movement achieved through relays connected with microprocessor and micro switches, eliminating the need for joysticks and complex control mechanisms. System performance test result showed that the auxiliary solar power supply of the wheelchair increased the travel range by approximately 86% compared with that of a wheelchair powered by battery alone.

scholarly journals A Framework of Uplink-Downlink NOMA Protocol for Multiple Access in IoT-Oriented Networks

2021 ◽  
pp. 236-241
Author(s):  
Anh-Tu Le ◽  
◽  
Dinh-Thuan Do
Keyword(s):  
Internet Of Things ◽  
Outage Probability ◽  
Mathematical Analysis ◽  
System Performance ◽  
Multiple Access ◽  
Wireless Systems ◽  
Fast Development

With the fast development of wireless systems and internet of things (IoT), non-orthogonal multiple access (NOMA) has been studied as one of effective schemes to meet increasing demands of massive users. Two types of NOMA transmission, i.e., uplink (UL) and downlink (DL), have been explored in term of mathematical analysis. The first one is derivation of outage probability for UL, DL. The second, we find parameters to adjust system performance to meet requirement in design of NOMA in practice.

scholarly journals Performance of qpsk system in the presence of pulse interference and noisy carrier reference signal

2003 ◽  
Vol 1 (1) ◽  
pp. 123-130
Author(s):  
Mihajlo Stefanovic ◽  
Milan Milosevic ◽  
Dragana Pavlovic
Keyword(s):  
Linear Model ◽  
Gaussian Noise ◽  
System Performance ◽  
Carrier Phase ◽  
Error Probability ◽  
Reference Signal ◽  
Signal Extraction ◽  
Pulse Interference ◽  
Noise Pulse ◽  
First Order

The aim of this paper is the determining the system performance in detecting the QPSK signal. The error probability is determined when the signal, Gaussian noise, pulse interference and imperfect carrier phase recovery are taken into consideration. Phase locked loop, as the constituent part of the receiver, is used in providing the synchronization reference signal extraction, which is assumed to be imperfect. The obtained results are based on the PLL non-linear model of the first order, with the emphasis on the degradation in the system performance produced by the imperfect carrier signal extraction. The system performance is determined when the signal corrupted by pulse interference and Gaussian noise is applied at the input of the receiver.

scholarly journals Impact of Resource Blocks Allocation Strategies on Downlink Interference and SIR Distributions in LTE Networks: A Stochastic Geometry Approach

2018 ◽  
Vol 2018 ◽  
pp. 1-15 ◽  
Author(s):  
Anthony Busson ◽  
Iyad Lahsen-Cherif
Keyword(s):  
Power Control ◽  
System Performance ◽  
Stochastic Geometry ◽  
Large Set ◽  
Transmission Power ◽  
Traffic Patterns ◽  
Lte Networks ◽  
Transmission Rates ◽  
Geometry Model ◽  
Allocation Strategies

We propose a model based on stochastic geometry to assess downlink interference and signal over interference ratio (SIR) in LTE networks. The originality of this work lies in the proposition and combination of resource blocks assignment strategies, transmission power control, and realistic traffic patterns into a stochastic geometry model. For this model, we compute the first two moments of interference. They are used to parameterize its distribution from which we deduce the SIR distribution. Outage and transmission rates (modulation and coding rate) are then derived to evaluate the system performance. Simulations that cover a large set of scenarios show the accuracy of our proposal and allow us to compare these strategies with more complex ones that aim to minimize global interference. Numerical evaluations highlight the behavior of the LTE network for different traffic patterns/load, eNodeB density, and amount of resource blocks and offer insights about possible parameterization of LTE networks.

Energy Efficiency with Adaptive Decoding Power and Wireless Backhaul Small Cell Selection

2016 ◽  
Author(s):  
Tri Minh Nguyen ◽  
Animesh Yadav ◽  
Wessam Ajib ◽  
Chadi Assi
Keyword(s):  
Energy Efficiency ◽  
Small Cell ◽  
Cell Selection ◽  
Wireless Backhaul ◽  
Adaptive Decoding
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