scholarly journals Low-Cost and Long-Range Node-Assisted WiFi Backscatter Communication for 5G-Enabled IoT Networks

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Zhimin Wang ◽  
Li Feng ◽  
Shumin Yao ◽  
Kan Xie ◽  
Yuqiang Chen
Keyword(s):  
Long Range ◽  
Low Cost ◽  
Full Duplex ◽  
Transmission Range ◽  
Equipment Cost ◽  
Backscatter Communication ◽  
Resource Limited ◽  
Half Duplex ◽  
Communication Scheme ◽  
Almost All

The fifth-generation-enabled Internet of Things (5G-enabled IoT) has been considered as a key enabler for the automation of almost all industries. In 5G-enabled IoT, resource-limited passive devices are expected to join the IoT using the WiFi backscatter communication (WiFi-BSC) technology. However, WiFi-BSC deployment is currently limited due to high equipment cost and short transmission range. To address these two drawbacks, in this paper, we propose a low-cost and long-range node-assisted WiFi backscatter communication scheme. In our scheme, a WiFi node can receive backscatter signals using two cheap regular half-duplex antennas (instead of using expensive full-duplex technique or collaborating with multiple other nodes), thereby reducing the equipment cost. Besides, WiFi nodes can help relay backscatter signals to remote 5G infrastructure, greatly extending the backscatter’s transmission range. We then develop a theoretical model to analyze the throughput of WiFi-BSC. Extensive simulations verify the effectiveness of our scheme and the accuracy of our model.

scholarly journals Exploiting Impact of Hardware Impairments in NOMA: Adaptive Transmission Mode in FD/HD and Application in Internet-of-Things

Sensors ◽  
2019 ◽  
Vol 19 (6) ◽  
pp. 1293 ◽  
Author(s):  
Chi-Bao Le ◽  
Dinh-Thuan Do ◽  
Miroslav Voznak
Keyword(s):  
Internet Of Things ◽  
Multiple Access ◽  
Low Cost ◽  
Relay Node ◽  
Ergodic Capacity ◽  
Adaptive Transmission ◽  
Full Duplex ◽  
Transmission Strategy ◽  
Hardware Impairments ◽  
Half Duplex

In this paper, a cooperative non-orthogonal multiple access (NOMA) system is studied for the Internet-of-Things (IoT) in which a master node intends to serve multiple client nodes. The adaptive transmission strategy is proposed at the relay node, i.e., the relay can be half-duplex (HD) and/or full duplex (FD). In practical terms, numerous low-cost devices are deployed in such IoT systems and it exhibits degraded performance due to hardware imperfections. In particular, the effects of hardware impairments in the NOMA users are investigated. Specifically, the closed-form expressions are derived for the outage probability. Moreover, the ergodic capacity is also analysed. This study also comparatively analyzes the orthogonal multiple access (OMA) and NOMA with HD and/or FD relaying. The numerical results are corroborated through Monte Carlo simulations.

scholarly journals Validation of a point-of-care rapid diagnostic test for hepatitis C for use in resource-limited settings

2019 ◽  
Vol 11 (4) ◽  
pp. 314-315
Author(s):  
James S Leathers ◽  
Maria Belen Pisano ◽  
Viviana Re ◽  
Gertine van Oord ◽  
Amir Sultan ◽  
...  
Keyword(s):  
Point Of Care ◽  
Low Cost ◽  
Rapid Diagnosis ◽  
Direct Acting Antivirals ◽  
Resource Limited Settings ◽  
Rapid Diagnosis Test ◽  
Resource Limited ◽  
Specificity And Sensitivity ◽  
Hcv Screening ◽  
Direct Acting

Abstract Background Treatment of HCV with direct-acting antivirals has enabled the discussion of HCV eradication worldwide. Envisioning this aim requires implementation of mass screening in resource-limited areas, usually constrained by testing costs. Methods We validated a low-cost, rapid diagnosis test (RDT) for HCV in three different continents in 141 individuals. Results The HCV RDT showed 100% specificity and sensitivity across different samples regardless of genotype or viral load (in samples with such information, 90%). Conclusions The HCV test validated in this study can allow for HCV screening in areas of need when properly used.

scholarly journals Diagnostic Capabilities of a Smartphone- Based Low-Cost Microscope

2020 ◽  
Vol 6 (3) ◽  
pp. 522-525
Author(s):  
Dorina Hasselbeck ◽  
Max B. Schäfer ◽  
Kent W. Stewart ◽  
Peter P. Pott
Keyword(s):  
Low Cost ◽  
Field Of View ◽  
Parasitic Diseases ◽  
Optical Parameters ◽  
Trade Off ◽  
Resource Limited ◽  
Wide Range ◽  
Diagnostic Applications ◽  
Diagnostic Capabilities

AbstractMicroscopy enables fast and effective diagnostics. However, in resource-limited regions microscopy is not accessible to everyone. Smartphone-based low-cost microscopes could be a powerful tool for diagnostic and educational purposes. In this paper, the imaging quality of a smartphone-based microscope with four different optical parameters is presented and a systematic overview of the resulting diagnostic applications is given. With the chosen configuration, aiming for a reasonable trade-off, an average resolution of 1.23 μm and a field of view of 1.12 mm2 was achieved. This enables a wide range of diagnostic applications such as the diagnosis of Malaria and other parasitic diseases.

scholarly journals Hybrid One-Way Full-Duplex/Two-Way Half-Duplex Relaying Scheme

IEEE Access ◽  
2017 ◽  
Vol 5 ◽  
pp. 7737-7745 ◽  
Author(s):  
Yurong Wang ◽  
Kui Xu ◽  
Aijun Liu ◽  
Xiaochen Xia
Keyword(s):  
Full Duplex ◽  
Half Duplex

scholarly journals Genome-wide integration site detection using Cas9 enriched amplification-free long-range sequencing

2020 ◽  
Author(s):  
Joost van Haasteren ◽  
Altar M Munis ◽  
Deborah R Gill ◽  
Stephen C Hyde
Keyword(s):  
Long Range ◽  
Insertional Mutagenesis ◽  
Lentiviral Vector ◽  
Integration Site ◽  
Low Cost ◽  
Safety Evaluation ◽  
Read Length ◽  
Chromosomal Dna ◽  
Wide Range

Abstract The gene and cell therapy fields are advancing rapidly, with a potential to treat and cure a wide range of diseases, and lentivirus-based gene transfer agents are the vector of choice for many investigators. Early cases of insertional mutagenesis caused by gammaretroviral vectors highlighted that integration site (IS) analysis was a major safety and quality control checkpoint for lentiviral applications. The methods established to detect lentiviral integrations using next-generation sequencing (NGS) are limited by short read length, inadvertent PCR bias, low yield, or lengthy protocols. Here, we describe a new method to sequence IS using Amplification-free Integration Site sequencing (AFIS-Seq). AFIS-Seq is based on amplification-free, Cas9-mediated enrichment of high-molecular-weight chromosomal DNA suitable for long-range Nanopore MinION sequencing. This accessible and low-cost approach generates long reads enabling IS mapping with high certainty within a single day. We demonstrate proof-of-concept by mapping IS of lentiviral vectors in a variety of cell models and report up to 1600-fold enrichment of the signal. This method can be further extended to sequencing of Cas9-mediated integration of genes and to in vivo analysis of IS. AFIS-Seq uses long-read sequencing to facilitate safety evaluation of preclinical lentiviral vector gene therapies by providing IS analysis with improved confidence.

Design and Implementation of a Multi-Channel HDLC Protocol Controller Based on FPGA

2011 ◽  
Vol 383-390 ◽  
pp. 6840-6845 ◽  
Author(s):  
Yong Hong Gu ◽  
Wei Huang ◽  
Qiao Li Yang
Keyword(s):  
Error Control ◽  
Data Transfer ◽  
Full Duplex ◽  
Programmable Logic ◽  
Data Link ◽  
Total Cost ◽  
Half Duplex ◽  
Level Data ◽  
Layer 2 ◽  
High Level

To transmit and receive data over any network successfully, a protocol is required to manage the flow. High-level Data Link Control (HDLC) protocol is defined in Layer 2 of OSI model and is one of the most commonly used Layer 2 protocol. HDLC supports both full-duplex and half-duplex data transfer. In addition, it offers error control and flow control. Currently on the market there are many dedicated HDLC chips, but these chips are neither of control complexity nor of limited number of channels. This paper presents a new method for implementing a multi-channel HDLC protocol controller using Altera FPGA and VHDL as the target technology. Implementing a multi-channel HDLC protocol controller in FPGA offers the flexibility, upgradability and customization benefits of programmable logic and also reduces the total cost of every project which involves HDLC protocol controllers.

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