[Tccc] Postdoc position at INSA Lyon

Guillaume VILLEMAUD guillaume.villemaud
Mon Sep 5 11:35:00 EDT 2011


*Postdoc position**: Optimisation of a radio propagation tool for indoor 
and indoor/outdoor radio network planning and optimisation.*

Supervisors: Guillaume Villemaud / Jean-Marie Gorce

  Place: CITI Lab -- INSA Lyon - France

_Description:_

In the framework of the iPLAN European project the aim of this postdoc 
is to enhance the computational efficiency and to adjust the 
complexity-accuracy trade-off of the MR-FDPF (Multi-Resolution Frequency 
Domain Partial Flows) method for indoor radio coverage prediction. This 
method, particularly efficient for indoor propagation, is devoted to be 
implemented in a radio network planning tool. This tool needs to propose 
all kind of modern radio link conditions: indoor, outdoor, indoor to 
outdoor, outdoor to indoor, for 3G/4G, WLAN or WMAN (WiMax), from 
macrocells to femtocells.

The first constraint this work should take care is the computational 
complexity at which target accuracy can be achieved. The discrete based 
approach from which our work will be derived is the Multi-Resolution 
Frequency Domain Partial Flows (MR-FDPF) method that was previously 
developed at INSA-LYON. This method exhibits very good properties for 
Indoor prediction but in turns may suffer from a high complexity in full 
3D environments. To alleviate this limit, we will have to reduce the 
mathematical complexity of the method at the price, if needed, of a 
lower accuracy. In this project, the proposed approach relies on a 
multi-resolution decomposition of the problem that requires several 
matrix inversions. How to reduce computational complexity due to matrix 
inversion is critical. In this project, the reduction of the complexity 
will be achieved by subspace projection and singular value decomposition 
(SVD).

Another goal of this work is to integrate in this tool some statistical 
analysis of the radio link which is developed in the laboratory. 
Frequency, time and space domain statistics could be extract from 
simulations to give more information on possible radio performance. 
Moreover, MIMO system evaluation has to be implemented.

Thus, the study will contain three main parts:

-computational efficiency enhancement of the MR-FDPF method;

-implementation of statistical analysis of radio channel behaviour 
rather than only considering mean power level and MIMO performance;

-validation with measurement campaigns

The postdoc candidate will work in the CITI Lab of INSA Lyon in order to 
propose all possible enhancements on the MR-FDPF method and will be 
associated to the Airelle INRIA project team.

References:

[1]       G. de La Roche, K. Jaffres-Runser and J-M. Gorce. "On 
predicting Indoor WLAN coverage with a fast discrete approach," 
International Journal of Mobile Network Design and Innovation. Vol 2, No 
1, 2007, pp.3-12.

[2]       J-M. Gorce, K. Jaffres-Runser and G. De La Roche. 
"Deterministic Approach for Fast Simulations of Indoor Radio Wave 
Propagation," IEEE Transactions on Antennas and Propagation. Vol 55, 
Issue 3, Part 2, March 2007, pp.938-948.

[3]M. Luo, D. Umansky, G. Villemaud, M. Lafort, JM Gorce, Estimating 
Channel Fading Statistics based on Radio Wave Propagation Predicted with 
Deterministic MRFDPF Method. In EUCAP 2011, Roma, Italy, April 2011.

----------------------------------------------
Guillaume VILLEMAUD, PhD
Associate professor - CITI Laboratory
International Exchange Coordinator- Electrical Engineering Department INSA Lyon, bat. Claude Chappe
6 avenue des Arts
69621 Villeurbanne cedex (France)

Tel : (33) 4 72 43 60 67
Fax : (33) 4 72 43 62 27
Email :guillaume.villemaud at insa-lyon.fr






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