Yu-Wen Chang

7477 Stanford Place408-821-2357

Cupertino, CA 95014     yuwen3@yahoo.com

                                                                                                                                               

OBJECTIVE   Seeking an engineer position in mobile/wireless communications.

 

SUMMARY

·   Over 15 years of experience in communication industry.

·   Knowledge on LTE/HSPA/WCDMA/GPRS/GSM network, systems and protocol architecture.

·   Cross-functional experience in communication algorithms, stack software, DSP, and lab test.

·   Hands-on experience in completing US carriers LTE certification process.

 

EXPERIENCE   Semiconductor Inc, Santa Clara, CA

PROTOCOL STACK SW ENGINEER (December 2013 - present)

      Performed the complete Verizon certification processes for LTE chipsets and OEM devices.

      On-site support for SFN and Lab Certification for Verizon projects at 7layers and Cetecom.

      IOT/IODT support for LTE Band-13/Band-4/Band-2 and eMBMS at Ericsson and ALU Labs.

      Performed VZW Domestic and Canada Global Field Interoperability Test at VZW designated markets.

      Performed eMBMS LC test at VZW NDET Lab.

      Analyzing logs, debugging, issue tracking for above VZW project activities.

     

Broadcom Corporation, Sunnyvale, CA

SENIOR STAFF SCIENTIST, SYSTEM TEST (April 2011 – December 2013)

       Developed test plans and designed test cases for 3GPP Release-7/8 features CSoHSPA, Enhanced HS-

                                  DSCH Serving Cell Change.

       Developed test plan and designed test cases for IPv6 UE protocol stack.

       Developed test plan and designed test cases for Robust Header Compression (RoHC) in LTE stack with

                                  VoLTE on CMW500 IMS/MLAPI test system..

       Developing test plan for LTE Rellease10 features - IP Flow Mobility (IFOM) and MAPCON.

              Analyzing logs for issues and failures observed in regression test and carrier acceptance on equipments

                                  CMW500/CRTU, Anite SAS/9000, Anritsu RTD and Agilent 8960.

       Supporting Ericsson and NSN IOT activities of testing HSPA+/WCDMA/GSM UE chipsets.

       Replicating failure scenarios on test boxes from IOT sessions.

       Leading daily lab testing and issue tracking for AT&T and other carrier certificate programs.

       Set up test automation on R&S test equipments.

 

VIA Communications, Fremont, CA

                           SENIOR SOFTWARE ENGINEER (December 2004 – March 2008)

                            Defined the requirements of Radio Resource Management module of GSM/GPRS mobile

                           station protocol stack. Designed and implemented GRR module and performed functional testing.

                          Defined RR-related requirements for EGPRS mobile station.

                          Participated in the interface design between GRR and L1, RLC/MAC, GMM modules.

                          Prepared for GRR test cases specified in 3GPP 51.010 for GCF approval.

                             

                           Opelcomm Inc., Fremont, CA

                           SENIOR SYSTEM DESIGNER (June 2002 – December 2004)

Designed the timing recovery algorithm and fixed-point implementation for Gigabit Ethernet 1000BASE-T PHY transceiver.

Participated in chip-level RTL simulation and verification with MATLAB/Simulink model for bit and cycle match.

Performed system-level optimization and tuning for equalizers, echo/NEXT cancellers, timing recovery and automatic gain control.

 

    Metron Communications Corporation, San Jose, CA

                           MEMBER OF TECHNICAL STAFF (September 2000 – October 2001)

                              Defined the functional requirements of GPRS mobile station Radio Resource Management and performed the detailed designs and implementations in C++.

                    Designed the specification of the network simulator for over-the-air testing of MS protocol stack.

 

                          C-Cube Microsystems, Milpitas, CA

     SENIOR FIRMWARE ENGINEER (April 1999 – September 2000)

        Designed and implemented MPEG1/2 Audio Encoder on SPARC core with cycle optimization.

        Verified firmware implementations with C reference model.

        Designed and implemented DTS Audio Decoder and DVD Audio Decoder.

                           Globalstar L. P., San Jose, CA

                          SYSTEM ENGINEERING SPECIALIST (June 1998 – April 1999)

                              Developed a tool to generate S and L-band antenna beam boundary from End Item Data Packet.

                              Designed fish-eye photo post-processing software to generate UT blockage profiles for system testing.

                              Specified the requirements for the call success rate prediction tool.

 

                           InterWAVE Communication, Redwood City, CA

    MEMBER OF TECHNICAL STAFF (August 1996 – May 1998)

        Designed and implemented speed-sensitive hand-over algorithms for GSM micro-cellular networks.

        Designed and implemented GSM dynamic BTS and mobile power control algorithms.

Implemented call queuing, directed retry, paging group reorganization and CCCH overload control.

        Evaluated system capacity and performed system configuration under different traffic loads.

        Performed load test for BSC CPU usage using BTS simulator.

        Designed and implemented Explicit Call Transfer for GSM Supplementary Services.

EDUCATION   Ph.D. IN ELECTRICAL ENGINEERING, August 1996.

   University of Maryland, College Park, MD

   Major: Communications, Minor: Computers.

   Dissertation: “Policies for Handoff and Channel Assignment in CDMA Cellular and LEO Satellite Networks.”

         Formulated a combined model for CDMA handoff and admission control problems.

         Designed optimal policies for assigning channels to handoff requests and newly arrived users.

   Dissertation advisor: Professor Evaggelos Geraniotis.

 

   M.S. IN ELECTRICAL ENGINEERING

   University of Maryland, College Park, MD

   Major: Communications.

 

   B.S. IN ELECTRICAL ENGINEERING

   National Taiwan University, Taiwan, R.O.C.

                Curricular emphasis on communications and computers.

 

PATENT          “Power Control of Remote Communication Devices” US Patent #6169907, January 2, 2001.

 

SELECTED PUBLICATIONS 

BOOK CHAPTERS

E. Geraniotis and Y. W. Chang, “Optimal Joint Handoff and Code Assignment in CDMA Cellular Networks”,

in Wireless Communications: TDMA versus CDMA, edited by S. Glisic and P. Leppanen, Kluwer Academic

Publishers, June 1997.

 

E. Geraniotis, Y. W. Chang, and W. B. Yang, “Optimal Policies for Multi-Media Integration in CDMA

Network”, in Code Division Multiple Access Communications, edited by S. Glisic and P. Leppanen, Kluwer

Academic Publishers, April 1995.