Hisham Abuella
Muslim | Cellular Systems Engineer
Rx digital front-end, channel estimation and AGC for cellular modems, after a doctorate in visible light sensing. Each bright point in the diagram is one piece of that work. Outside work, I love creating UIs with Claude.
Apple, San Diego. Previously Qualcomm.Decoded symbols
The research behind the bright points. Each label is the point's Gray code in the diagram.
NR channel estimation
Brought Rel-18 DMRS (etype1/etype2) into the system simulator, cut MMSE tap memory with online downsampling, and reduced signal leakage in noise estimation.
Rx digital front-end
mmWave and Sub6 RxFE: lab debugging tools, system documentation, and support for FW, RF and SW teams through chip bring-up.
Automatic gain control
AGC for cellular modem systems, with lab bring-up and debugging.
Visible light sensing
Non-contact vital signs and vehicle speed estimation (ViLDAR) from visible light, prototyped on Raspberry Pi and software-defined radio.
Modulation classification
Automatic modulation classification with kernel density estimation.
US patent
Speed estimation, detection and ranging using visible light in vehicles.
Papers
Selected publications, titles as published. The full list is on Google Scholar.
- Cloud vs. Local LLM Agents for Generating Lecture Slides with an Agent Skill: A Preliminary Cost–Time–Quality StudyPreliminary study, October 2026. The article, the IEEE-style two-column paper and every generated deck.study
- Non-Contact Vital Signs Monitoring Through Visible Light SensingIEEE Sensors Journal, vol. 20, no. 7, 20200101
- ViLDAR — Visible Light Sensing Based Speed Estimation using Vehicle's HeadlampsIEEE Transactions on Vehicular Technology, vol. 68, no. 11, 20190101
- Hybrid RF/VLC Systems: A Comprehensive Survey on Network Topologies, Performance Analyses, Applications, and Future DirectionsIEEE Access, vol. 9, 20210101
- Automatic Modulation Classification Based on Kernel Density EstimationIEEE Canadian Journal of Electrical and Computer Engineering, vol. 39, no. 3, 20160100
- System and Method for Speed Estimation, Detection and Ranging using Visible Light in VehiclesU.S. Patent No. 10,768,194 B21111
What I work with
Signal chain
- 5G NR baseband
- RF digital front-end
- Digital pre-distortion
- Channel and noise estimation
- OFDM
Implementation
- MATLAB
- C / C++
- Python
- LabVIEW
- Fixed-point models
Lab and ML
- Chip bring-up and debugging
- Software-defined radio
- ML for wireless systems
Engineering notes
Every article is in English and Arabic.