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Laxman CHAUHAN

Paris

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Entreprises

  • Alcatel Lucent - LTE Modem Expert Engineer

    Paris 2014 - maintenant * Performance and Capacity improvement of LTE (4G) eNB

    * Involves the improvement in LTE data protocol stack to increase eNB capacity.

  • ERCOM - Senior LTE Layer 1/2 Software Engineer

    Paris 2013 - 2014 * Implementation and testing of Carrier Aggregation (CA), LTE release 10 feature.

    * Validation and customer support for LTE (FDD, TDD and CA) related issues.

  • Motorola Mobility - Senior LTE/3G Layer1 & RF Software Engineer

    Toulouse 2007 - 2013 Senior LTE/3G Layer1 & RF Software Engineer Aug. 2007 – Cont.
     D3G and D4G bring up, development, testing and validation of D3G and D4G (MIPI 0.64 onwards) modules with integrated baseband software.
     Implementation and integration of LTE layer1 modules for various RF ICs
     Design, development and testing of 3G Signal Processing Layer components for various RF and Base Band chipsets.
     Development, test and integration of diversity receiver in 3G, 3G channel management and RF modules.
     RF IC and platform bring up (Power On reset). Design, development and testing of LTE/WCDMA RFIC characterization and phasing on various RF chipsets for power and data optimization.
     Development and integration of various L1T modules for Compress/FMO gaps, frame tables, macros in 3G SPL.
     Design and integration RF driver (3G/LTE/CDMA) software for next generation platforms, Freescale, Fujitsu and Infineon. Integration of RF with base-band chipset from D3G/D4G up to LTE/WCDMA/CDMA/GSM call
     Perform software and hardware level debug using Lauturbach, Logic Analyzer and other test equipments.
     Worked on single receiver architecture for GSM and UMTS.
     RF/Layer1 software debug using Lauterbach, CMW500, Aeroflex, D4G analyzer and other tools.
     Complete software planning from requirements up to validation (V cycle) of complex projects. Drive complete project cycle.

  • Motorola Mobility - 2G/3G Protocol Stack Software Engineer

    Toulouse 2004 - 2007 3G & 2G Protocol Stack Engineer July 2004 – Aug. 2007

     Design, Development, Testing and Integration of GSM/GPRS/EGDE Protocol Stack (L1, RLC/MAC and RR layers)
     Configuration Management using ClearCase, Clear DDTS etc.
     Testing and analyses of mobile phones using Logical Analyzer, CMU200, HP 8960, RTA and other test utilities Protocol testing with CRTU/RACAL system testers
     Providing technical support for mobile handsets and network performance. Developed strong problem analyzing and troubleshooting skills.
     Key contact of various customers returned, field tests, FTA and internal testing issues related to the protocol stack and for VoIP (Mobile PTT) based protocol stack (SIP+GPRS/EDGE) test, analysis and development.
     Various PTT (Push To Talk) issues analysis and correction at SIP and IP level.
     Providing the testing scenarios to field test teams around the world for the specific issues. Making field tests on customer’s demand in various countries to solve critical issues.
     Demonstrating/Analyzing various issues seen on network side.
     Providing reports to various operators and network infrastructure providers. Involved in providing effective solutions to various issues in different projects.

  • Thales Alenia Space - Project Internship

    TOULOUSE 2003 - 2003 SDLS - Satellite Based Aerospace Control System
    THALES ALENIA SPACE
    February 2003 – July 2003 (6 months)Toulouse Area, France
    * Worked on the Satellite Data Link System (SDLS) project. This was an ESA (European Space Agency) project developed by European consortium led by Alcatel Space Industries. The objective of this project was to prove the viability to provide satellite communications services of voice and data for security critical applications such as traffic management, position reporting etc. in aeronautical environment. The project was based on advance satellite communications technologies in order to maximise the instantaneous number of aircrafts without degradation in the Quality of Services proposed by the future SDLS system. A prototype, called SDLS demonstrator of this project was developed under the leadership of ASPI, Toulouse, France.
    * Worked on the channel coding, digital modulation and channel models aspects of satellite communication systems. Modeled and simulated serial (RS & Convolutional) and parallel (Turbo Codes) concatenated codes to be used in the SDLS and are defined in CCSDS standards. The performance was tested over complete chain of transmission using different modulation schemes and various channel models such as Gaussian, Rayleigh and Rician channels with and without Interleaver.
    * Worked on coding and modulation schemes in order to get good spectral efficiency as well as coding gain. For that, Trellis Coded Modulation (TCM) scheme over serial concatenated codes was proposed.
    * Different types of CDMA codes such as PN sequences, Gold, Kasami and Hadamard codes were studied in CDMA synchronous and asynchronous systems. Multi-user detection techniques were studied in asynchronous environment.
    * Configured and tested the SDLS demonstrator and the various services proposed by it, at IF level in absence of the satellite.
    * Preparation for testing of the Demonstrator with satellite ARTEMIS. It consists of generating the ephemeris data using STK, modification in SA BUS protocol and writing C code to control the movement of base station antenna automatically.

  • Tata Comunications - Senior Engineer (Satellite Communications)

    Neuilly-sur-Seine 2000 - 2001 Senior Engineer (Satellite Communications)
    Tata Communications
    September 2000 – July 2001 (11 months)Pune Area, India
    Senior Engineer (Vikram Satellite Earth Station)
    * Team lead of engineers and non technical personnel at the largest satellite earth station.
    * Tested, configured and managed various satellite communication equipments.
    * Trouble shooting of satellite links with other satellite earth stations worldwide and wireless links between costumer premises and ITMC.
    * Tested and managed microwave and fiber optic links with various gateways.
    * Configuration, testing and optimisation of various satellite links with other stations worldwide. Managed television programmed broadcasting.
    * Undergone various training programmes from IIM and IIT Mumbai for technology and network management.

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