*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 : [email protected] _______________________________________________ IEEE Communications Society Tech. Committee on Computer Communications (TCCC) - for discussions on computer networking and communication. [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/tccc
