Research Article
Multi-modulation Scheme for RFID-Based Sensor Networks
@INPROCEEDINGS{10.1007/978-3-030-67720-6_2, author={Zijing Tian and Zygmunt J. Haas}, title={Multi-modulation Scheme for RFID-Based Sensor Networks}, proceedings={Communications and Networking. 15th EAI International Conference, ChinaCom 2020, Shanghai, China, November 20-21, 2020, Proceedings}, proceedings_a={CHINACOM}, year={2021}, month={2}, keywords={RFID systems IoT WISP Energy harvesting Multi-modulation scheme Throughput optimization Sensor network}, doi={10.1007/978-3-030-67720-6_2} }- Zijing Tian
Zygmunt J. Haas
Year: 2021
Multi-modulation Scheme for RFID-Based Sensor Networks
CHINACOM
Springer
DOI: 10.1007/978-3-030-67720-6_2
Abstract
RFID technology is playing an increasingly more important role in theInternet of Things, especially in the dense deployment model. In such networks, in addition to communication, nodes may also need to harvest energy from the environment to operate. In particular, we assume that our network model relies on RFID sensor network consisting of Wireless Identification and Sensing Platform (WISP) devices and RFID exciters. In WISP, the sensors harvest ambient energy from the RFID exciters and use this energy for communication back to the exciter. However, as the number of exciters is typically small, sensors further away from an exciter will need longer charging time to be able to transmit the same amount of information than a closer by sensor. Thus, further away sensors limit the overall throughput of the network. In this paper, we propose to use a multi-modulation scheme, which trades off power for transmission duration. More specifically, in this scheme, sensors closer to the exciter use a higher-order modulation, which requires more power than a lower-order modulation assigned to further away sensors, for the same bit error rate of all the sensors’ transmissions. This reduces the transmission time of the closer sensors, while also reducing the charging time of the further away sensors, overall increasing the total network throughput. The evaluation results show that the RFID sensor network with our multi-modulation scheme has significantly higher throughput as compared with the traditional single-modulation scheme.
