Experience

Investment
• Investment Management
• 500 - 600 Employee
• Senior Consultant

  • Aug 2018 - Present


에릭슨

• IT Services and IT Consulting

• 책임연구원 (Senior Research Engineer)

  • Jul 2010 - Jun 2018

  1. RF Transceiver for LTE&WCDMA RRUS (Remote Radio Unit multi-Standards) - Design Specification from Customer requisition and 3GPP standard - RF chain link budget calculation - DAC/ADC and RF circuit design using simulation tool (i.e. ADS, Excel) - PCB design for high speed and multi layer using CAD tool (i.e. Cadence Allegro, Mentor) - Design verification with RF instruments (i.e. Agilent, Rohde&Schwarz) - Root cause analysis and well-organized documentation skill 2. RF System integration and verification - HW&SW Integration test - RF system performance verification as well as Temperature test - Development of automatic test program cooperating with GPIB and RF instruments (Agilent VEE, Term macro, shell program etc) - Statistic analysis from test data for System stability - Log analysis to investigate problems of HW/SW 3. BS(Base Station) RF performance verification - BS conformance test according to 3GPP 37.104 & 141 - Handle BSM(Base Station Manager) program such as OSS-RC(Operations Support System-Radio&Core) - Log capture using automation test program (Term macro, shell commands) - Log analysis to investigate problems of HW/SW - DVT support for SKT, LGU+ - Field support and maintenance 4. Expat at Ericsson R&D Carling campus in Ottawa Canada for 6 months - RRUS development for NTT-DoCoMo in Japan - HW/SW integration and verification as well as trouble-shooting 5. Expat at Ericsson R&D center in Beijing China for 8 months - RIR(Repeater Interface Radio) transceiver design for SKT, LGU+ - RIR HW/SW integration and verification - RRUS development for Band 1, 3, 5, 7 - RF system performance verification as well as trouble-shooting - BS RF performance verification using signals of Modem Digital Unit Show less



LG Electronics

• South Korea
• Computers and Electronics Manufacturing
• 700 & Above Employee

• 선임연구원 (Senior Research Engineer)

  • Apr 2007 - Jun 2010

  1. SW development of Transceiver control and O&M(Operations and Maintenance) for LGU+ All-IP BTS and RRH- RF driver SW design (i.e. DAC/ADC, PLL, Variable Attenuator etc)- IPC(Inter Process Communication) design with Modem channel card SW block (i.e. TX/RX configuration, Multi-carrier Power control with AGC & DPD, Keep Alive, Alarm handler, Remote FW loading etc)- C/C++ programming and debug skill2. RF Transceiver design collaboration for Alcatel-Lucent RRH (Band 1, 3)- Zero-IF Direct Conversion TX design by DC-offset & Image cancellation- For DPD(Digital Pre Distortion), Feedback Receiver design Show less

• 주임연구원 (Junior Research Enginner)

  • Nov 2005 - Mar 2007

  1. Expat at Nortel R&D Carling campus in Ottawa Canada for 6 months- RF Transceiver design verification for WiMAX 2.3G/2.5G/3.5G RRH(Remote Radio Head) - TMA(Tower Mounted Amplifier) and Bias-T verification and Trouble shooting- Front End Filter verification and Trouble shooting2. RF Transceiver design for WCDMA RRH- Zero-IF Direct Conversion TX design by DC-offset & Image cancellation- For DPD(Digital Pre Distortion), Feedback Receiver design

• 연구원 (Research Engineer)

  • Mar 2003 - Oct 2005

  1. Design Collaboration at Nortel R&D center in Paris France for a month- Zero-IF Direct Conversion TX design for Multi-carrier WCDMA RRH- For DPD(Digital Pre Distortion), Feedback loop design skill up 2. Basic design and verification skill up for RF Transceiver- RF basic components design simulation using ADS- RF chain link budget simulation (i.e. Cascade Gain, NF, P1dB, OIP3 etc)- RF PLL local design as well as good isolation between branches- Spurious free RF transceiver design- Design verification using RF instruments of Agilent, R&S- Automation test program development using Agilent VEE and GPIB3. RF Transceiver design and verification for Multi-carrier WCDMA Node-B Show less