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Keywords

Computational complexity Chaos Blind estimation Semiconductor optical amplifier SOA Digital Predistortion Nonlinear predistortion Linearization Spread spectrum communication Chip duration Communication Digital communication Digital arithmetic Coherent Optical OFDM Chirping CO-OFDM Chaotic communication Multiaccess communication PAPR reduction Robustness Speech analysis
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67

Stéphane Azou

Professeur des Universités (section CNU 63)

Contact Information

Address : ENIB, Lab-STICC (UMR CNRS 6285), CS73862, 29238 Brest cedex, France.
Phone : +33.(0).2.98.05.66.44
E-mail: azou [at] enib.fr
URL: www.enib.fr/~azou

Education

  • 2007: HDR degree (accreditation to supervise research) defended at the University of Brest (UBO), France Title: Furtive transmission and state-space estimation. Advisor: Prof. Gilles BUREL.
  • 1997: PhD degree of the University of Brest (UBO) in Electrical Engineering.Title: Balanced systems realization via orthogonalization of input maps—Gramians and approximation. Advisor: Prof. Pierre VILBE.
  • 1993: Master of Science degree (DEA) in Electrical Engineering at the University of Brest.

 

Professional Experience

  • Since sept. 2012: Professor at the Brest National Engineering School (ENIB), France; Research work at the Lab-STICC (UMR CNRS 6285)
  • 2000-2012: Assistant Professor at the University of Brest, France (UBO); Research work at the LEST (UMR CNRS 6165), then at the Lab-STICC (UMR CNRS 6285)
  • 1998-2000: Assistant Professor at the French Naval Academy (École Navale), Lanvéoc-Poulmic, France; Research work at the Signal Processing Group (Ecole Navale).
  • 1997-1998: Research and Teaching Assistant at the University of Brest, France (UBO); Resarch work at the LEST (UMR CNRS 6165).

 

Journal articles28 documents

  • Julio Ortiz-Cornejo, Pascal Morel, Stéphane Azou, Jorge Pardiñas-Mir. A Numerical Assessment of an Effective Envelope-Tracking Semiconductor Optical Amplifier Design for Coherent-Optical OFDM Transmission. Optics Communications, Elsevier, 2020, ⟨10.1016/j.optcom.2019.124474⟩. ⟨hal-02390882⟩
  • Mohamad Younes, Mihai Telescu, Stéphane Azou, Pascal Morel, Noël Tanguy. Very low-complexity filter lookup-table design with non-uniform spacing for SOA linearisation. IET Optoelectronics, Institution of Engineering and Technology, In press, ⟨10.1049/iet-opt.2019.0044⟩. ⟨hal-02568443v2⟩
  • Haidar Taki, Ali Mansour, S. Azou, Abbass Nasser, Koffi-Clément Yao. Pulse parity modulation for impulse radio UWB transmission based on non-coherent detection. Physical Communication, Elsevier, 2020, 40, pp.101061-1 - 101061-11. ⟨10.1016/j.phycom.2020.101061⟩. ⟨hal-02520037⟩
  • Jacqueline Sime, Pascal Morel, Mohamad Younes, Igor Stievano, Mihai Telescu, et al.. The effects of digital predistortion in a CO-OFDM system – a stochastic approach. IEEE Photonics Technology Letters, Institute of Electrical and Electronics Engineers, In press, ⟨10.1109/LPT.2020.2994892⟩. ⟨hal-02610694v2⟩
  • Nhat-Quang Nhan, Pascal Morel, Stéphane Azou, Michel Morvan, Philippe Gravey, et al.. Erratum to “Sparse Preamble Design for Polarization Division Multiplexed CO-OFDM/OQAM Channel Estimation”. Journal of Lightwave Technology, Institute of Electrical and Electronics Engineers (IEEE)/Optical Society of America(OSA), 2018, 36 (22), pp.5316-5316. ⟨10.1109/JLT.2018.2874573⟩. ⟨hal-01954348⟩
  • Nhat-Quang Nhan, Pascal Morel, Stéphane Azou, Michel Morvan, Philippe Gravey, et al.. Sparse Preamble Design for Polarization Division Multiplexed CO-OFDM/OQAM Channel Estimation. Journal of Lightwave Technology, Institute of Electrical and Electronics Engineers (IEEE)/Optical Society of America(OSA), 2018, 36 (13), pp.2737-2745. ⟨10.1109/JLT.2018.2822732⟩. ⟨hal-01954338⟩
  • Haidar Taki, Stéphane Azou, Ali Hamie, Pascal Morel, Ali Al Housseini, et al.. Chirping techniques for enhancing the performance of SOA-based UWB over fiber systems: An experimental demonstration. AEÜ - International Journal of Electronics and Communications / Archiv für Elektronik und Übertragungstechnik, Elsevier, 2018, 94, pp.221 - 225. ⟨10.1016/j.aeue.2018.07.008⟩. ⟨hal-01858825⟩
  • H Taki, S Azou, A Hamie, A Al Housseini, A Alaeddine, et al.. On Phaser-Based Processing of Impulse Radio UWB over Fiber Systems Employing SOA. Optical Fiber Technology, Elsevier, 2017, 36, pp.33-40. ⟨10.1016/j.yofte.2017.02.001⟩. ⟨hal-01456315⟩
  • Cherif Diouf, Mohamad Younes, Alexandru Noaja, Stéphane Azou, Mihai Telescu, et al.. Robustness analysis of a parallel two-box digital polynomial predistorter for an SOA-based CO-OFDM system. Optics Communications, Elsevier, 2017, 402, pp.442 - 452. ⟨10.1016/j.optcom.2017.06.023⟩. ⟨hal-01563827⟩
  • H Taki, S Azou, A Hamie, Ali Al Housseini, A Alaeddine, et al.. Simple pre-distortion schemes for improving the power efficiency of SOA-based IR-UWB over fiber systems. Optics Communications, Elsevier, 2017, ⟨10.1016/j.optcom.2016.07.066⟩. ⟨hal-01353980⟩
  • H Taki, S Azou, A Hamie, Ali Al Housseini, A Alaeddine, et al.. Improving the power efficiency of SOA-based UWB over fiber systems via pulse shape randomization. Optical Fiber Technology, Elsevier, 2016, 31, pp.161-167. ⟨10.1016/j.yofte.2016.07.006⟩. ⟨hal-01353969⟩
  • Stéphane Azou, Serban Bejan, Pascal Morel, Ammar Sharaiha. Performance improvement of a SOA-based coherent optical-OFDM transmission system via nonlinear companding transforms. Optics Communications, Elsevier, 2015, 336, pp.177 - 183. ⟨10.1016/j.optcom.2014.09.067⟩. ⟨hal-01088835⟩
  • Mihai Stanciu, Stéphane Azou, Emanuel Radoi, Alexandru Serbanescu. A statistical analysis of multipath interference for impulse radio UWB systems. Journal of The Franklin Institute, Elsevier, 2015, 352, pp.5952 - 5967. ⟨10.1016/j.jfranklin.2015.09.020⟩. ⟨hal-01503181⟩
  • Serban Bejan, Stéphane Azou, Pascal Morel, Cherif Diouf, Mihai Telescu, et al.. A Joint Linearization/Companding Approach for Improving a CO-OFDM Transmitter. IEEE Photonics Technology Letters, Institute of Electrical and Electronics Engineers, 2015, 27 (20), pp.2162-2165. ⟨10.1109/LPT.2015.2455674⟩. ⟨hal-01218942⟩
  • Rizwan Akbar, Emanuel Radoi, Stéphane Azou, Muhammad Najam-Ul-Islam. Low-complexity synchronization algorithms for orthogonally modulated IR-UWB systems. EURASIP Journal on Wireless Communications and Networking, SpringerOpen, 2013, pp.2013:199. ⟨10.1186/1687-1499-2013-199⟩. ⟨hal-00876527⟩
  • Rizwan Akbar, Emanuel Radoi, Stéphane Azou. A Non-Data-Aided Rapid Synchronization Method for UWB Impulse Radio. Communications Letters, IEEE, 2012, 16 (8), pp.1308 - 1311. ⟨10.1109/LCOMM.2012.060112.120763⟩. ⟨hal-00733959⟩
  • Rizwan Akbar, Emanuel Radoi, Stéphane Azou. Comparative Analysis of some Low-Complexity Blind Synchronization Algorithms for IR-UWB Systems. journal of communications, 2012, 7 (5), pp.374-381. ⟨10.4304/jcm.7.5.374-381⟩. ⟨hal-00714115⟩
  • Mihai Stanciu, Stéphane Azou, Alexandru Serbanescu. On the Blind Estimation of Chip Time of Time-Hopping Signals Through Minimization of a Multimodal Cost Function. IEEE Transactions on Signal Processing, Institute of Electrical and Electronics Engineers, 2011, 59 (2), pp.842-847. ⟨10.1109/TSP.2010.2090872⟩. ⟨hal-00657241⟩
  • Rizwan Akbar, Emanuel Radoi, Stéphane Azou. Performance Evaluation of Impulse Based UWB System in AWGN and Indoor Multipath Channel. Military Technical Academy Review, 2009, XIX (4), pp.53-74. ⟨hal-00488227⟩
  • Vincent Choqueuse, Stéphane Azou, Koffi Clément Yao, Ludovic Collin, Gilles Burel. Modulation Recognition for MIMO Communications. Military Technical Academy Review, 2009, XIX (2), pp.183-196. ⟨hal-00395159⟩
  • Mihai Stanciu, Stéphane Azou. Time Of Chip Estimation for an UWB System with Pulse Position Modulation. Military Technical Academy Review, 2008, XVIII (2), pp.161-172. ⟨hal-00395187⟩
  • Mihai Bogdan Luca, Stéphane Azou, Gilles Burel, Alexandru Serbanescu. On Exact Kalman Filtering of Polynomial Systems. IEEE Transactions on Circuits and Systems - Part I, 2006, 53 (6), pp.1929-1340. ⟨10.1109/TCSI.2006.870899⟩. ⟨hal-00170280⟩
  • C. Bouder, S. Azou, G. Burel. Performance analysis of a spreading sequence estimator for spread spectrum transmissions. Journal of The Franklin Institute, Elsevier, 2004, 341 (7), pp.595 - 614. ⟨10.1016/j.jfranklin.2004.07.006⟩. ⟨hal-01508739⟩
  • Céline Bouder, Stéphane Azou, Gilles Burel. Estimation, en contexte non coopératif, des paramètres d’une transmission à spectre étalé par séquence directe. Traitement du Signal, Lavoisier, 2003, 20 (4). ⟨hal-01508745⟩
  • S. Azou, P. Brehonnet, P. Vilbe, L.C. Calvez. A new discrete impulse response Gramian and its application to model reduction. IEEE Transactions on Automatic Control, Institute of Electrical and Electronics Engineers, 2000, 45 (3), pp.533 - 537. ⟨10.1109/9.847738⟩. ⟨hal-01508752⟩
  • P. Vilbe, S. Azou, P. Brehonnet, L.C. Calvez. The L/sup 2/-optimal time-delay rational Laplace model revisited. IEEE Transactions on Circuits and Systems Part 1 Fundamental Theory and Applications, Institute of Electrical and Electronics Engineers (IEEE), 1999, 46 (4), pp.505 - 512. ⟨10.1109/81.754853⟩. ⟨hal-01508754⟩
  • S. Azou, P. Vilbe, L.C. Calvez. Balanced Realization using an Orthogonalization Procedure and Modular Polynomial Arithmetic. Journal of The Franklin Institute, Elsevier, 1998, 335 (8), pp.1507 - 1518. ⟨10.1016/S0016-0032(96)00138-X⟩. ⟨hal-01508759⟩
  • L.C. Calvez, S. Azou, P. Vilbé. Variation on Euclid's algorithm for polynomials. Electronics Letters, IET, 1997, 33 (11), ⟨10.1049/el:19970658⟩. ⟨hal-01508760⟩

Conference papers39 documents

  • Julio Cesar Ortiz-Cornejo, Stéphane Azou, Jorge Pardiñas-Mir, Pascal Morel. An Improved Envelope Tracking SOA Amplifier for CO-OFDM Transmission by Using PSO. 2018 IEEE 10th Latin-American Conference on Communications (LATINCOM), Nov 2018, Guadalajara, France. pp.1-5, ⟨10.1109/LATINCOM.2018.8613235⟩. ⟨hal-02468952⟩
  • Ammar Sharaiha, Thierry Rampone, Stéphane Azou. Fonctions et systèmes à base de SOA pour la conversion de fréquences et la transmission IR-UWB sur fibre. Journée du Club Optique et Microondes, JCOM 2017, , Jul 2017, Limoges, France. ⟨hal-01560565⟩
  • Ammar Sharaiha, Pascal Morel, Stéphane Azou, John D. Sierra Beltran. Performances d’un SOA à gain bloqué (GC-SOA) dans un système de transmission optique CO’OFDM. Journées Nationales d'Optique Guidée (JNOG 2017), Jul 2017, Limoges, France. ⟨hal-01560602⟩
  • J. C. Ortiz Cornejo, S Bejan, Stéphane Azou, J. A. Pardinas Mir, Pascal Morel. On Envelope-Tracking for SOA Amplification of Multicarrier Signals. 2017 IEEE International Symposium on Circuits and Systems (ISCAS), 2017, Baltimore, MD, USA, France. ⟨10.1109/ISCAS.2017.8050451⟩. ⟨hal-01492351⟩
  • Cong Chen, Kim Batselier, Mihai Telescu, Stéphane Azou, Noël Tanguy, et al.. Tensor-Network-Based Predistorter Design for Multiple-Input Multiple-Output Nonlinear Systems. IEEE 12th International Conference on ASIC (ASICON), Oct 2017, Guiyang, China. ⟨hal-01680123⟩
  • Mohamad Younes, Mihai Telescu, Noël Tanguy, Chérif El Valid Diouf, Pascal Morel, et al.. Robustness Improvement of Compact Predistorters in a CO-OFDM System Using Semiconductor Optical Amplifiers. 29th International Conference on Microelectronics (ICM), 2017, Dec 2017, Beirut, Lebanon. ⟨10.1109/ICM.2017.8268828⟩. ⟨hal-01697205⟩
  • Haidar Taki, Stéphane Azou, Ali Al Housseini, Ali Hamié, Ali Alaeddine, et al.. Pulse Shape Pre-distortion for Improving the Power Efficiency of SOA-based IR-UWB over Fiber Systems. 23rd IEEE International Conference on Telecommunications (ICT 2016), May 2016, Thessaloniki, Greece. ⟨10.1109/ICT.2016.7500471⟩. ⟨hal-01508675⟩
  • Stéphane Azou, Serban Bejan, Pascal Morel, Chérif El Valid Diouf, Ammar Sharaiha, et al.. On the use of digital predistortion to compensate the nonlinear effects of semiconductor optical amplifiers. 20th IEEE Workshop on Signal and Power Integrity (SPI), May 2016, Turin, Italy. ⟨10.1109/SaPIW.2016.7496281⟩. ⟨hal-01342086⟩
  • Mohamad Younes, Stéphane Azou, Noël Tanguy, Mihai Telescu, Pascal Morel, et al.. Utilisation conjointe d’une réduction de PAPR via une loi µ et d’un modèle comportemental pour la linéarisation d’un transmetteur optique . Journée du Club Optique et Micro-Ondes (JCOM2016), Jun 2016, Nice, France. ⟨hal-01342225⟩
  • Mohamad Younes, Stéphane Azou, Noël Tanguy, Mihai Telescu, Pascal Morel, et al.. Sur la robustesse de pré-distorseurs numériques statiques pour la compensation de non-linéarités au sein de transmetteurs optiques multi-porteuses. Journée du Club Optique et Micro-Ondes (JCOM2016), Jun 2016, Nice, France. ⟨hal-01342228⟩
  • Mohamad Younes, Stéphane Azou, Noël Tanguy, Pascal Morel, Mihai Telescu, et al.. Pré-distorsion numérique à très faible complexité pour la compensation d'effets non-linéaires au sein d'un transmetteur optique CO-OFDM. Journées Nationales d'Optique Guidée, Optique Bordeaux 2016, Jul 2016, Bordeaux, France. ⟨hal-01342221⟩
  • Haidar Taki, Stéphane Azou, Ali Hamié, Ali Al Housseini, Ali Alaeddine, et al.. Reach Extension of an IR-UWB over Fiber System via OOK Randomization and SOA Amplification. IEEE European Conf. on Networks and Communications (EUCNC), Jun 2015, Paris, France. ⟨hal-01508685⟩
  • H Taki, S Azou, A Hamie, A Al Housseini, A Alaeddine, et al.. On Optimizing the Operating Conditions of a Mach-Zehnder Modulator for IR-UWB over Fiber Transmission. IEEE Int. Conf. on Digital Information and Communication Technology and its Applications, Apr 2015, Beyrouth, Lebanon. ⟨hal-01508682⟩
  • Stéphane Azou, Serban Bejan, Pascal Morel, Chérif El Valid Diouf, Mihai Telescu, et al.. Compensation d’effets non-linéaires au sein d’un transmetteur optique CO-OFDM par pré-distorsion numérique en bande de base. Journées Nationales d'Optique Guidée, Optique Bretagne 2015, Jul 2015, Rennes, France. ⟨hal-01342199⟩
  • Stéphane Azou, Serban Bejan, Pascal Morel, Ammar Sharaiha. A comparative study of nonlinear companding schemes for CO-OFDM transmissions. 13th International Conference on Optical Communications and Networks (ICOCN), Nov 2014, Suzhou, China. ⟨hal-01131924⟩
  • Guillaume Lucius, Frédéric Le Roy, Denis Aulagnier, Stéphane Azou. An algorithm for extremal eigenvectors computation of Hermitian matrices and its FPGA implementation. IEEE International Midwest Symposium on Circuits and Systems (MWSCAS 2013), Aug 2013, Columbus, OH, United States. ⟨10.1109/MWSCAS.2013.6674920⟩. ⟨hal-01508692⟩
  • Stéphane Azou, Emanuel Radoi. Blind Algorithms for Timing Acquisition of Impulse Radio UWB Communications. IEEE Communications 2012, Jun 2012, Bucarest, Romania. ⟨hal-00714103⟩
  • Rizwan Akbar, Emanuel Radoi, Stéphane Azou. Energy Detection based Blind Synchronization for Pulse Shape Modulated IR-UWB Systems. The 22nd IEEE Symposium on Personal, Indoor, Mobile and Radio Communications (PIMRC 2011), Sep 2011, Toronto, Canada. pp.1-5. ⟨hal-00657668⟩
  • Sébastien Pennec, Gildas Touin, Stéphane Azou, Ludovic Collin. On joint acoustic communication and positioning through MFSK-modulated signals and Costas arrays. IEEE OCEANS'10, May 2010, Sydney, Australia. pp.1-5. ⟨hal-00485451⟩
  • Sébastien Pennec, Gildas Touin, Stéphane Azou, Ludovic Collin. Experimental results of a joint communication and positioning system based on MFSK signals. ECUA 2010, Jul 2010, Istanbul, Turkey. pp.1-6. ⟨hal-00491662⟩
  • Rizwan Akbar, Emanuel Radoi, Stéphane Azou. Conception d'une forme d'onde IR-UWB optimisée et analyse de ses performances dans le canal IEEE 802.15.3a. MajecSTIC'10, Oct 2010, Bordeaux, France. pp.1-8. ⟨hal-00562663⟩
  • Rizwan Akbar, Emanuel Radoi, Stéphane Azou. Maximum Likelihood and Orthogonal Subspace based approach for Improved IR-UWB Channel Estimation. EUSIPCO 2010, Aug 2010, Aalborg, Denmark. pp.1-5. ⟨hal-00485719⟩
  • Vincent Choqueuse, Stéphane Azou, Koffi Clément Yao, Ludovic Collin, Gilles Burel. Modulation Recognition for MIMO Communications. IEEE COMM'08, Jun 2008, Bucarest, Romania. pp.283-286. ⟨hal-00485432⟩
  • Mihai Stanciu, Stéphane Azou. On blind estimation of the parameters for an Ultra Wideband communication signal. IEEE COMM'08, Jun 2008, Bucarest, Romania. pp.297-300. ⟨hal-00485426⟩
  • Vincent Choqueuse, Stéphane Azou, Koffi Clément Yao, Ludovic Collin, Gilles Burel. Blind Modulation Recognition for MIMO communications. IEEE Communication Conference, Jun 2008, Bucarest, Romania. pp.Non renseigne. ⟨hal-00518576⟩
  • Mihai Bogdan Luca, Stéphane Azou, Emanuel Hodina, Alexandru Serbanescu, Gilles Burel. Pseudo-blind demodulation of chaotic DS-SS signals through Exact Kalman Filtering. IEEE COMM'06, Jun 2006, Bucarest, Romania. pp.1-4. ⟨hal-00485412⟩
  • S Azou, Mihai Bogdan Luca, Gilles Burel, Alexandru Serbanescu. Multipath Combining in Chaotic Direct-Sequence Spread Spectrum Communications through Dual Estimation. IEEE Oceans, Jun 2005, Brest, France. ⟨10.1109/OCEANSE.2005.1511785⟩. ⟨hal-01508700⟩
  • Mihai Bogdan Luca, S Azou, Gilles Burel, Alexandru Serbanescu. A Complete Receiver Solution for a Chaotic Direct Sequence Spread Spectrum Communication System. IEEE Int. Symp. on Circ. and Syst., May 2005, Kobe, Japan. ⟨10.1109/ISCAS.2005.1465461⟩. ⟨hal-01508707⟩
  • S Azou, Mihai Bogdan Luca, Gilles Burel, Alexandru Serbanescu. Automatic Gain Control in a Kalman Filter Based Synchronization Chaotic Receiver. IEEE Communications, Jun 2004, Bucharest, Romania. ⟨hal-01508715⟩
  • Mihai Luca, Alexandru Serbanescu, Stéphane Azou, Gilles Burel. A New Compression Method using a Chaotic Symbolic Approach. IEEE Communications, Jun 2004, Bucarest, Romania. ⟨hal-01508717⟩
  • Guillaume Madre, El Houssaïn Baghious, S Azou, Gilles Burel. Design of a variable rate algorithm for CS-ACELP coder. IEEE Int. Conf. Communications (ICC), May 2003, Anchorage,, United States. ⟨10.1109/ICC.2003.1204246⟩. ⟨hal-01508728⟩
  • Guillaume Madre, El Houssaïn Baghious, S Azou, Gilles Burel. Fast pitch modelling for CS-ACELP coder using Fermat Number Transforms. Burel, “Fast pitch modelling for CS-ACELP coder using Fermat Number Transforms”, IEEE International Symposium on Signal Processing and Information Technology (ISSPIT), Dec 2003, Darmstadt, Germany. ⟨10.1109/ISSPIT.2003.1341233⟩. ⟨hal-01508725⟩
  • S Azou, C Pistre, L Le Duff, Gilles Burel. Sea trial results of a chaotic direct-sequence spread spectrum underwater communication system. IEEE Oceans, Sep 2003, San Diego, United States. ⟨10.1109/OCEANS.2003.178097⟩. ⟨hal-01508722⟩
  • Guillaume Madre, El Houssaïn Baghious, S Azou, Gilles Burel. Linear Predictive Speech Coding using Fermat Number Transform. EURASIP Conf. on Multimedia Communications and Speech Processing, Jul 2003, Zagreb, Croatia. ⟨hal-01508726⟩
  • Céline Bouder, S Azou, Gilles Burel. A robust synchronisation procedure for blind estimation of the symbol period and the timing offset in spread spectrum transmissions. IEEE International Symposium on Spread Spectrum Techniques and Applications (ISSSTA2002), Sep 2002, Prague, Czech Republic. ⟨10.1109/ISSSTA.2002.1049322⟩. ⟨hal-01508735⟩
  • S Azou, Gilles Burel. Design of a demodulator in a chaos-based spread spectrum communication system using dual Unscented Kalman Filters. IEEE Communications, Dec 2002, Bucharest, Romania. ⟨hal-01508732⟩
  • S Azou, C Pistre, Gilles Burel. A chaotic direct sequence spread-spectrum system for underwater communication. IEEE Oceans, Oct 2002, Biloxi, United States. ⟨10.1109/OCEANS.2002.1192004⟩. ⟨hal-01508730⟩
  • Gilles Burel, André Quinquis, Stéphane Azou. Interception and Furtivity of Digital Transmissions. IEEE International Conference Communications, address = Bucarest, Romania, year = 2002, month = 5-7 December, nat = 0,, 2002, France. pp.Non renseigne. ⟨hal-00518865⟩
  • Ludovic Collin, S Azou, Koffi Clément Yao, Gilles Burel. On spatial uncertainty in a surface long baseline positioning system. Fifth European Conference on Underwater Acoustics, ECUA 2000, Jul 2000, Lyon, France. ⟨hal-01508737⟩