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Reference : UMR8520-LAUCLA-003
Workplace : VILLENEUVE D ASCQ
Date of publication : Friday, November 06, 2020
Type of Contract : FTC Scientist
Contract Period : 12 months
Expected date of employment : 4 January 2021
Proportion of work : Full time
Remuneration : Around 2000 euros per month
Desired level of education : PhD
Experience required : Indifferent
IoT generates a massive increase in wireless transmissions, a heterogeneity of deployed systems and a great variability of environments (spatial, temporal). Moreover, the protocols for accessing the radio resource must be reduced to their strict minimum (grant free access, Non Orthogonal Multiple Access - NOMA). A major consequence is the increased impact of interference. Future networks will then have to face two challenges: robustness and adaptability, with a strong energy and lifetime constraint. In particular, interference will not exhibit the traditional Gaussian behavior generally assumed in heterogeneous IoT / M2M networks but will have a more impulsive behavior [1,2]. This impulsivity will have a major impact on future networks that it is important to understand, especially for short packets where one or more strong impulses can drastically degrade performance . However, this impact remains difficult to determine. While theoretical approaches (such as stochastic geometry, for example) attempt to provide answers , experimental results are sorely lacking for optimizing radio links. Moreover, it is difficult to carry out satisfactory experiments in a laboratory environment since a large number of nodes and a variety of protocols must be deployed and evaluated in an environment that evolves over time.
The project is based on two axes:
* Axis 1: NOMA solutions for M2M communications. The objective is to define transmission and reception strategies that are both energy-efficient and robust in the context of IoT, i.e. for sporadic transmissions and interference that can sometimes have non-Gaussian behavior. In particular, the design of receivers and the digital processing to implement the non-linearities necessary for optimal reception will be studied, based on 28nm FD-SOI technology. Moreover, in the case of LP-WANs, the receiver will have to be able to process a large number of asynchronous signals [5,6].
* Axis 2: Experimentation in a real environment. The objective is to develop the proposed solutions, at least on software defined radio tools, and to implement them in environments where other technologies are already functional, sometimes in the same frequency bands (at 2.4 GHz for example).
To develop a low-power communication node (transmission/reception) in 28nm CMOS technology adapted to communication environments dominated by non-Gaussian interference.
- Understanding the impact of impulsive interference on a receiver
- Identify the hardware and software parts affected
- Designing a complete reception chain that performs well in this non-Gaussian noise.
- Digital communications, transceiver design
- Signal processing
- CMOS design,
- Matlab and Cadence type tools
IRCICA (Institute for Research on Software and Hardware Components for Information and Advanced Communication) is a Service and Research Unit (USR-3380) associating the CNRS and the University of Lille. Based on a project hotel structure, IRCICA has been developing interdisciplinary research over the last ten years to imagine and create responsible information and communication technologies. This approach enables researchers with complementary skills to be brought together in the same place to tackle major scientific and societal challenges with interdisciplinary and/or disruptive approaches from the very beginning of the projects.
IRCICA's research activities are based on 3 experimental platforms at the best international level, one of which is in telecom (Advanced Communication Systems).
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