HK (Hyung Keun) Choi

***** ** **** **

Plantation, Florida 33322 act500@r.postjobfree.com

Profile

Wireless Communication Professional with more than 10 years of mobile phone developing experiences specializing in baseband SW development, integration, customization and debugging.

Key Technical Specialties

In depth understanding of GSM, WCDMA and LTE 3GPP specification.

Troubleshooting of cellular stack and network issue through modem log and source code analysis.

Familiar with NV-IOT, GCF/PTCRB, and carrier specific compliance matrix documents like AT&T 10776.

Experience with Qualcomm, Intel, ST-Ericsson baseband and RF SW as well as respective Radio / RF debugging and development tools .

Hands on experience with RF test equipment including Agilent 8960, R&S CMU200, CMW500, Anritsu MT8820C.

Embedded C development knowledge.

Familiar with source code version management system including GIT, Clearcase, and Perforce.

Working Experience

BlackBerry July 2012 – February 2016

Sunrise, Florida Systems SW Developer II

Successfully delivered BB10 OS products including Q10, Q20, Z30, and Z3 models meeting a challenging product development schedule.

Responsible for resolving radio software issues arising from GCF, PTCRB certification and carrier specific lab / field testing by providing SW fixes.

Troubleshoot protocol stack and network issue for key performance improvement.

Integrated and validated modem SW fix patch.

Managed and integrated RF parameters and Systems NV items into SW ceaselessly collaborating with RF HW team during the course of the project.

Traveled and supported Blackberry Mobile phone production by JDM manufacturing partner Foxconn providing onsite factory SW support at Foxconn production facilities in China and Taiwan.

Participated in Blackberry's first IoT (Internet of Things) project developing Asset Tracker for the efficient container management. Responsible for developing and testing of modem and GPS module interfacing with QNX Wireless Framework which communicates to uBlox Modem and GPS chipset. LG Electronics January 2010 – May 2012

Seoul, Republic of Korea Senior RF SW Engineer

Responsible for RF calibration, controlling of RF transceivers for different hardware designs and radio bring-up.

Collaborated with RF HW team in testing and optimizing RF parameters for Android OS based LTE smart phones and Tablet.

Integrated and validated RF NV items into SW for QCT and Intel based mobile products.

Traveled to LG factory in Pyoungtaek and supported manufacturing by development and testing of factory RF calibration and testing tools. LG Electronics July 2004 – December 2009

Seoul, Republic of Korea Senior Radio/Protocol SW Engineer

Successfully delivered LG WCDMA Feature phones including Chocolate, Shine and Secret models meeting a challenging product development schedule.

Responsible for resolving radio software issues arising from GCF, PTCRB certification and carrier specific lab / field testing.

Traveled internationally providing on-site radio/protocol support for Network Vendor IOT activities, radio SW certification activities (GCF/PTCRB), carrier compliance lab testing and carrier required field testing activities especially for AT&T, Vodafone, Orange, Hutchison WCDMA mobile products.

Familiar with carrier compliance matrix documents such as AT&T 10776. Ran pre-test internally while debugging the radio issues before the formal submission of the Modem SW to the carrier.

Participated and technically supported HSUPA demonstration at ITU Telecom World 2006 Hong Kong and CES 2007 Las Vegas.

K&L Microwave May 1996 – August 1996

Salisbury, Maryland Assembler / Inspection Technician

Worked at the assembly line manufacturing and inspecting of RF filters. Educational Background

Georgia Institute of Technology, Atlanta, Georgia 2002 – MS in EE Thesis: “Blind source separation of the audio signals in a real world” University of Maryland, College Park, Maryland 2000 – BS in EE Hanyang University, Seoul, Korea Attended – EE dept Work Eligibility

Naturalized US citizen

Contact this candidate