About Me
Hello! Welcome to my personal portfolio. I am a Ph.D Student in Electrical Engineering and Computer Science at the University of Siegen, Germany. I do my research with the Ubiquitous Computing Group, led by Prof. Dr. Kristof Van Laerhoven. I specialize in LoRaWAN integration with wearable sensor networks, aiming to create smart and sustainable technological solutions.
My passion lies at the intersection of Electrical Engineering, Artificial Intelligence, Data Science, and Sustainable Development. I thrive in collaborative environments and am dedicated to contributing to the Sustainable Development Goals (SDGs) through innovative research.
Education
- Doctor of Engineering, 2023–present University of Siegen
- M.Sc. Telecommunication Engineering, 2021 Dedan Kimathi University of Technology
- B.Sc. Electrical & Electronic Engineering, 2017 Dedan Kimathi University of Technology
Interests
- Wireless communication & LoRaWAN
- Sensor networks and embedded sensing
- Machine learning for propagation and localization
- Environment‑aware IoT systems
Let’s connect and explore how we can collaborate to create impactful and sustainable technological solutions!
Summary of Events
June 2025:
- Attended the European Conference on Networks and Communications & 6G Summit (EuCNC & 6G Summit) in Poznan, Poland; presented a paper on Statistical Evaluation of Indoor LoRaWAN Environment-Aware Propagation for 6G Networks. The paper was selected for invited extension in the EURASIP Journal on Wireless Communications and Networking (Special Issue on EuCNC & 6G Summit 2025).
November 2024:
- Presented a poster on "A Data Descriptor for LoRaWAN Path Loss Measurements in an Indoor Office Setting: Impacts of Environmental Factors" at the ZESS PhD Forum 2024.
May 2024:
- Presented a poster on "LoRaWAN-Integrated Wearable Sensor Networks for Human Activity Recognition" at the ZESS PhD Forum 2024.
- Gave a talk on "LoRaWAN Path Loss Measurements in an Indoor Office Setting Including Impacts of Environmental Factors."
October 2023:
- Began research work with the Ubiquitous Computing Group, at the University of Siegen.
May 2023:
- Moved from Kenya to Düsseldorf, Germany, and started pursuing a German language course at the Institute for International Communication.
April 2023:
- Won the prestigious DAAD Ph.D Scholarship.
Feb 2022:
- Began teaching/lecturing courses in the Electrical and Electronic Engineering department of Dedan Kimathi University of Technology.
October 2021:
- Successfuly defended my Master of Science thesis : A Water Quality Monitoring system using Wireless Sensor Networks.
Research
Projects
LoRaWAN Path Loss Measurements in an Indoor Office Setting: Impacts of Environmental Factors
Date: May 2024 - Ongoing
Description: This ongoing research aims to measure and analyze the behavior of LoRaWAN signals in indoor environments, focusing on how various environmental factors affect signal propagation. The study is conducted at the University of Siegen and involves developing enhanced path loss models to account for different wall types and environmental parameters such as temperature, humidity, pressure, CO₂ concentration, particulate matter (PM2.5), signal-to-noise ratio (SNR), etc.
Water Quality Monitoring System using Wireless Sensor Networks
Date: March 2020 – October 2021
Description: Developed a wireless sensor network to monitor water quality parameters in real-time as part of my M.Sc project.
- Designed and deployed sensor nodes to measure pH, turbidity, and temperature.
- Implemented data collection and transmission protocols for real-time monitoring.
- Provided timely alerts for deviations from standard water quality levels.
Text Message-Based Electrical Devices Monitoring and Control System Using GSM Technology
Date: May 2016 – December 2016
Description: Developed a remote monitoring and control system for electrical devices using SMS commands via GSM technology during my undergraduate studies.
- Integrated GSM modules with microcontrollers for seamless communication.
- Developed a user-friendly interface for sending SMS commands.
- Enabled remote control of electrical devices to enhance convenience and energy management.
Presentations
Location:Siegen, Germany
Date: 19/11/2024
- A Data Descriptor for LoRaWAN Path Loss Measurements in an Indoor Office Setting: Impacts of Environmental Factors.
Date: 22/05/2024
- LoRaWAN-integrated Wearable Sensor Networks for Remote Human Activity Recognition: Applications, Challenges, and Possible Solutions: A Review.
- LoRaWAN Path Loss Measurements in an Indoor Setting, including Human and Environmental Effects.
Location: Nyeri, Kenya
Date: 13/11/2019
- A Study on the Performance of LoRa in a Rural Environment: Connectivity and Range Evaluation - An abstract-reviewed presentation of a masters project research.
Publications
2025
Nahshon M. Obiri and Kristof Van Laerhoven, "Environment-Aware Indoor LoRaWAN Path Loss: Parametric Regression Comparisons, Shadow Fading, and Calibrated Fade Margins." arXiv preprint, October 2025.
Nahshon M. Obiri and Kristof Van Laerhoven, "A Statistical Evaluation of Indoor Lorawan Environment-Aware Propagation for 6G: MLR, ANOVA, and Residual Distribution Analysis." in 2025 Joint European Conference on Networks and Communications & 6G Summit (EuCNC/6G Summit), pp. 494–499, June 2025.
Nahshon M. Obiri and Kristof Van Laerhoven, "EnviKal-Loc: Sub-10m Indoor LoRaWAN Localization using an Environmental-Aware Path Loss and Adaptive RSSI Smoothing." arXiv preprint, May 2025.
Nahshon M. Obiri and Kristof Van Laerhoven, "A Comprehensive Data Description for LoRaWAN Path Loss Measurements in an Indoor Office Setting: Effects of Environmental Factors." IEEE Access, vol. 13, pp. 83148-83170, 2025.
2024
Nahshon M. Obiri and Kristof Van Laerhoven, "A Survey of LoRaWAN-integrated Wearable Sensor Networks for Human Activity Recognition: Applications, Challenges and Possible Solutions." IEEE Open Journal of the Communications Society, vol. 5, pp. 6713-6735, 2024.
2023
2021
Teaching Experience
I taught the following courses:
- Seminar Data Science -- Machine Learning: Have a view here.
I taught the following courses:
- Circuit and Theory of Networks II & III
- Microprocessors
- Introduction to Engineering and Computing
- Wireless Communication I
- Control Engineering I
- Signals and Communication II
I taught the following courses:
- Electrical Measurements and Instrumentation
I taught the following courses:
- Electromagnetics
- Digital Electronics II
Curriculum Vitae
Please open/download an English version of my resume here.
Bitte öffnen oder laden Sie hier eine deutsche Version meines Lebenslaufs herunter.