- Analyzing combinations of frequency bands and antenna ports for carrier aggregation in 4G/5G commercial modems, and designing passive RF networks consisting of switches and power dividers to facilitate testing automation ▷Adapted an existing tool summarizing band-antenna usage to a new file format of carrier aggregation plans, boosting its efficiency by >20x.▷ Designing RF networks according to band-antenna combinations and costumers' needs and interest, covering 70%−90% of 10, 000+ test cases of carrier aggregation.- Developing features of an RF front-end system with Python as a part of a base station dedicated to functional and performance testing on 4G/5G commercial modem operating in FR1 and FR2.▷ Implemented automation of RF calibration procedures and improved its efficiency by 5 – 10%.▷ Extended frequency support of an existing FR1 RF system beyond its nominalhardware designs from 6GHz to 7.2GHz, and characterized its EVM as part of evidence of successful full-stack integration.▷ Characterizing and modeling the variation in the frequency response of the major components of RF hardware to update criteria of self tests for spectral flattening.- Developing, implementing, and refactoring automation scripts for introducing new test equipment (a hand-held spectrum analyzer), applying new features in existing test equipment (EVM measurement), and consolidating functions of the testing equipment of 3 vendors with an improved testing efficiency by ∼ 50%.

Researched and developed algorithms to address wireless scheduling by integrating machine learning techniques and information-theoretic results, and analyzed problems on the information-theoretic limits of wireless networks with channel knowledge uncertainty and secrecy requirements. Published 7 papers in top-tier journals and conferences. - Established theoretical grounds of a scaling optimality of rate-splitting schemes generalized from NOMA for 5G radio in some channel regimes. - Established a scaling law of rate gain from power control over scheduling in interference networks. - Established theoretical grounds of an optimality of treating interference as noise for secure communications. - Discovered new information-theoretic bounds and established theoretical grounds of the fragility of schemes based on lattice codes, interference alignment, and spatial beamforming with channel knowledge impairments.

- Designed an engine of time-frequency MIMO channel estimation with reference signals for Physical Downlink/Uplink Shared/Control Channels based on 3GPP Release 16. - Implemented the engine with Python, and integrated it into an asynchronous link-level simulation framework for internal studies on and technical proposals for 5G specifications.

Developed a prototype of a dynamic spectrum sharing system - done by integrating 4G technologies and Beyond-4G research works from seven local groups - conducted public demonstrations in 5G summit - be recognized as Finalist for the best paper award in NST 2017

1. Refined the OFDM-based channel sounder prototype on MATLAB. - measured 16 × 4 MIMO channels in semi-real time based on an MMSE-based channel estimation algorithm resilient against incumbent radios. - evaluated the performance of fingerprinting-based wireless positioning and hybrid/digital beamforming. - mentored 10+ master students on wireless channel measurements and characterizations in three industry-sponsored projects for 4G/5G applications. - co-authored 3 papers in top-tier journals and 4 in conferences.2. Specified the coexistence conditions for UHF-RFID and 4G LTE operating at neighboring bands - done by a self-developed automation tool integrating LTE-compatible basestations - secured project sponsor’s UHF-RFID spectrum license worthy $10M+by resolving the regulator’s doubts over the coexistence of both systems in normal operations.3. Organized a campaign of spectrum observation and channel measurement for fixedwireless applications in sub-6 GHz bands at outdoor and in commercial buildings - analyzed the path loss characteristics and profiled the spectrum occupancy - acquired a one-year spectrum license for pilot trials of Beyond-4G applications in downtownTaipei

- Worked as the Chief Counselor in a company stationed on a remote island and supervised the proper functions, from military missions to member welfare, in the company.

1. Developed a wideband OFDM-based channel sounder prototype - Conducted channel measurements in high-speed railway and outdoor-to-indoor scenarios to facilitate seamless 4G coverage in tunnels with Radio-over-Fiber relays.2. Developed experimental platforms for intelligent reflecting surfaces - done by integrating on MATLAB optimization algorithms, commercial EM software packages and RF instruments - co-authored 3 papers in a top-tier journal and conferences.

- Carried out duties including sharing administrative affairs with faculty instructor, consulting all student inquiries, and grading all student homework, reports and partial problems in exams.- Courses: Digital Circuit Lab, Complex Analysis, Logic Design, and Wireless Communications and Experiments.

Developed test automation tools with Tcl for 3G CDMA chipsets - to reduce the workload by 90% during field trials - to help identify the root cause of the weakness in the cell handover algorithm in the product to be released.