I am a Wireless/RF/PHY System Engineer with 7+ years of industry and research experience across 5G/LTE radio systems, RF/PHY algorithm specification, signal-processing simulation, massive-MIMO radio development, and wireless validation workflows.
My GitHub profile is organized as a technical portfolio that demonstrates my ability to translate complex wireless and RF/PHY requirements into structured, practical, and well-validated solutions. Each project presents a complete development lifecycle, covering requirement analysis, mathematical modeling, algorithm design, simulation, implementation, performance evaluation, technical interpretation, and professional technical documentation.
| Core Positioning | Technical Focus |
|---|---|
| 5G NR / 6G Wireless Systems | RF/PHY algorithms, massive MIMO, OFDM, beamforming, synchronization |
| RF Architecture & Specification | BF/BFC, carrier configuration, timing, DPD behavior, IQ capture, validation flow |
| Simulation & Validation | MATLAB, Python, C/C++, BER, EVM, SINR, throughput, spectral efficiency |
| Research & Testbed Experience | OpenAirInterface, LTE/5G RAN-core integration, BLE performance evaluation |
flowchart LR
A["3GPP / System Requirement"] --> B["RF / PHY Architecture"]
B --> C["Algorithm Specification"]
C --> D["MATLAB / Python Modeling"]
D --> E["Link-Level Simulation"]
E --> F["Performance Metrics"]
F --> G["C / C++ Implementation Concept"]
G --> H["Test and Validation Workflow"]
H --> I["Root-Cause Analysis"]
I --> J["Requirement / Specification Update"]
F --> F1["BER"]
F --> F2["EVM"]
F --> F3["SINR"]
F --> F4["ACLR"]
F --> F5["Throughput"]
Senior System Specification Engineer - RF Architecture & Specification
Apr 2023 - May 2026
System Specification Engineer - RF Architecture & Specification
Sep 2022 - Mar 2023
Embedded RF Workflow / Hardware Validation Collaboration
Jul 2023 - Jun 2024
Researcher / Research Assistant / Research Intern
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| Repository | Technical Focus | What It Demonstrates |
|---|---|---|
wireless-system-simulation-validation |
MATLAB/Python wireless simulation and validation | Practical RF/PHY simulation workflow, result generation, EVM/SINR/throughput analysis |
5G-NR-6G-Wireless-Engineering-Portfolio |
5G NR, 6G, RF, channel modeling, beamforming | Broad wireless-engineering portfolio with MATLAB, Python, and C structure |
PHY-Algorithm-Design-Firmware-Implementation |
OFDM sync, MIMO-OFDM, channel estimation, equalization, AMC | Algorithm-to-firmware thinking with model, implementation concept, and validation metrics |
5G-RF-Architecture-Specification-Verification |
RF architecture, specification, verification, RCA | Specification-driven RF architecture and validation case-study structure |
RF-Microwave-Circuit-Design-Portfolio |
ADS, Cadence, S-parameters, matching, ACPR/EVM/IP3 | RF/microwave circuit and RF-performance engineering portfolio |
Energy-Efficiency-Evaluation-of-Bluetooth-5-BLE-5-Technology |
BLE 5 coded PHY, energy, PER, range | Research-based wireless evaluation with MATLAB and measurement-aligned modeling |
Multi-Connectivity-in-IoT-Network |
IoT multi-connectivity simulation | Wireless connectivity performance analysis using MATLAB/Python concepts |
| C-CPP-Programming-and-Algorithms | C/C++ algorithms, data structures, memory management, and object-oriented programming | Software-development and problem-solving skills through structured programming projects |
| Arduino-Embedded-Systems-and-Automation | Embedded control, sensors, hardware interfaces, displays, motors, and automation | Practical microcontroller programming, non-blocking control, and hardware integration |
| DSP-Algorithm-Design-and-Implementation | FFT, spectrum analysis, FIR/IIR filtering, and fixed-point DSP | DSP algorithm design, numerical implementation, result analysis, and verification |
| Matlab-Simulink-System-Modeling-and-Testbench-Validation | MATLAB algorithm simulation, Simulink system modeling, and testbench validation | Model-based design, subsystem integration, testbench development, and performance verification |
| Repository | Main Domain | Algorithms / Methods | Tools | Output |
|---|---|---|---|---|
| 5G NR / 6G Wireless Engineering Portfolio | Wireless systems | MIMO, beamforming, link budget, channel modeling | MATLAB, Python, C | Reports, simulations, figures |
| PHY Algorithm Design & Firmware Implementation | PHY/DSP | OFDM sync, LS/MMSE, ZF/MMSE, AMC, Viterbi, Q15 | MATLAB, Python, C/C++ | Link-level models, firmware concepts |
| 5G RF Architecture, Specification & Verification | RF system architecture | BF/BFC, timing, carrier config, IQ verification | MATLAB, Python, C | Specification-style validation |
| RF / Microwave Circuit Design Portfolio | RF/microwave | S-parameters, matching, NF, stability, IP3, EVM | ADS, Cadence, KiCad | Circuit studies and analysis |
| Wireless System Simulation & Validation | Simulation validation | Beam sweeping, beam selection, wireless testing workflow | MATLAB, Python | Simulation cases and analysis |
| BLE Energy Efficiency Evaluation | BLE / IoT | PER, range, energy, channel models | MATLAB | Thesis-related evaluation |
| Multi-Connectivity in IoT Network | IoT connectivity | Throughput, latency, packet loss, reliability | MATLAB / Python | Performance evaluation |
| C/C++ Programming and Algorithms | Software development | Algorithms, data structures, memory management, object-oriented programming | C, C++ | Programming projects and algorithm implementations |
| Arduino Embedded Systems and Automation | Embedded systems | Sensor acquisition, hardware interfaces, motor control, displays, automation | Arduino, Embedded C/C++ | Embedded control and automation projects |
| DSP Algorithm Design and Implementation | Digital signal processing | FFT, spectrum analysis, FIR/IIR filtering, fixed-point processing | MATLAB, Python | DSP models, analysis, and verification |
| MATLAB and Simulink System Modeling and Testbench Validation | System modeling and validation | Algorithm simulation, Simulink testbench design, subsystem integration, performance verification | MATLAB, Simulink | Simulation models, testbenches, and validation results |
| Category | Methods / Topics |
|---|---|
| OFDM / MIMO | FFT/IFFT, CP insertion/removal, pilot mapping, MIMO channel matrix modeling, ZF/MMSE detection |
| Channel Estimation | LS, MMSE, Wiener-MMSE, pilot-aided estimation, interpolation, NMSE analysis |
| Beamforming | Array response, complex weights, phase/amplitude mismatch, BF/BFC calibration, CAZAC/Zadoff-Chu calibration concepts |
| RF Impairments | EVM, ACLR/ACPR, IQ imbalance, phase-noise concepts, PA nonlinearity, DPD behavior |
| Link Metrics | BER, PER, EVM, SINR, throughput, spectral efficiency, capacity |
| Validation | MATLAB/Python reference model, C/C++ implementation concept, regression checks, result plots, technical report |
- RF/PHY algorithm specification: BF/BFC, Synchronization & Timing, Carrier Configuration, Beam Management, DPD-related RF behavior.
- Architecture and feature definition: functional block responsibilities, algorithm procedure workflows, interface alignment, and CP1/CP2/CP3 release-oriented work.
- Simulation and validation: MATLAB-based PHY/RF modeling, algorithm robustness analysis, calibration timing, RF-chain mismatch, timing alignment, and performance metrics.
- Cross-functional engineering: RF/HW/FW/test coordination, system-level reviews, root-cause analysis, and customer-driven issue investigation.
- Research and testbed work: OpenAirInterface LTE/5G testbed deployment, S1AP/NAS signaling analysis with Wireshark, BLE performance research with MATLAB and lab validation.
- Embedded/RF workflow: Linux, SSH/SCP, CLI/HW control concepts, UL/DL calibration weight computation, IQ capture timing, and signal insertion/capture workflow.
Performance Evaluation of Bluetooth Low Energy Technology Under Interference
H. Karvonen, K. Mikhaylov, D. Acharya, and M. M. Rahman, 2018.
Research area: BLE 4 / BLE 5 coded PHY, interference analysis, PER, range, energy efficiency, analytical modeling, MATLAB simulation, and measurement-aligned validation.
Goal:
Build an engineering-grade public portfolio for 5G NR, 6G, RF, PHY, and wireless validation roles.
Focus:
1. MATLAB/Python/C simulation projects
2. Technical reports with equations and result analysis
3. RF/PHY algorithm design and verification workflows
4. Algorithm-to-firmware implementation structure
5. Recruiter-readable project summaries
6. Senior-engineer-readable technical depth
I am open to opportunities in:
- Wireless System Engineering
- RF System Engineering
- PHY Algorithm Design
- 5G/6G Research Engineering
- RF Test & Validation
- OTA / RF Verification
- Algorithm-to-Firmware Implementation
- RAN / O-RAN / AI-RAN related engineering
Location: Oulu, Finland
Mobility: Finland and Europe
Work authorization: EU permanent residence; no sponsorship required within the EU
- 6G PHY and AI-native radio access
- NTN and satellite wireless receiver algorithms
- MIMO-OFDM link-level and system-level simulation
- O-RAN / AI-RAN architecture and validation workflows
- RF impairment modeling, PA linearization, and DPD
- OTA/MPAC chamber validation methodology
- Algorithm-to-firmware implementation for RF/PHY systems
- Expand each portfolio repository with complete technical reports, equations, simulation workflow, and reproducible results.
- Add MATLAB and Python verification scripts for every wireless/RF project.
- Add C/C++ algorithm-to-firmware examples for selected PHY modules.
- Add result figures: BER/EVM/SINR/throughput/ACLR/capacity plots.
- Keep repositories aligned with Wireless System Engineer, RF System Engineer, PHY Algorithm Engineer, and Test & Validation roles.
