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Optimized Gateway Placement for Interference Cancellation in Transmit-Only LPWA Networks
Hongxian Tian1, Mary Ann Weitnauer2, Gedeon Nyengele3
1School of Electronic and Information Engineering Beijing Jiaotong University, Beijing 100044, China. hxtian@bjtu.edu.cn.
Sensors (Basel, Switzerland)
|November 15, 2018
Summary
Optimizing gateway placement in low-power wide-area sensor networks improves packet delivery. Our algorithms reduce contention by strategically locating gateways for better signal reception, even with interference.
Area of Science:
- Wireless Sensor Networks
- Communication Engineering
- Signal Processing
Background:
- Low-power wide-area sensor networks (LPWANs) are crucial for IoT applications.
- Gateway placement significantly impacts network performance and reliability.
- Interference cancellation is a key challenge in dense sensor networks.
Purpose of the Study:
- To investigate optimal gateway placement strategies in LPWANs.
- To analyze the impact of interference cancellation on packet decoding.
- To develop algorithms for maximizing packet delivery ratio under contention.
Main Methods:
- Developed a mathematical model for residual error in interference cancellation.
- Deduced a 'two-crescent' region for decoding collided packets from two sensors.
- Proposed two greedy algorithms for optimizing gateway locations in large networks.
- Conducted simulations to evaluate algorithm performance against naive placement.
Main Results:
- Identified a specific geometric region enabling dual-packet decoding during collisions.
- Simulations demonstrated that proposed algorithms significantly reduce average contention.
- Optimized gateway placements resulted in a higher packet delivery ratio compared to naive methods.
Conclusions:
- Strategic gateway placement is vital for efficient LPWAN operation.
- The proposed greedy algorithms offer a scalable solution for network optimization.
- Effective interference cancellation modeling enhances the understanding of network capacity.
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