Jaihyung C.

I build SDR/RF and embedded wireless systems for signal capture, RF analysis, tracking, ranging, direction finding, and field-deployed prototypes. My strongest area is combining SDR, RF signal processing, ESP32 firmware, and real hardware debugging. I have hands-on experience with SDR receivers/transmitters, RF capture, spectrum monitoring, signal detection, demodulation workflows, wireless ranging, GNSS/location concepts, and Python tools for logging, visualization, and validation. For embedded work, I develop ESP32 firmware using ESP-IDF, C/C++, and FreeRTOS, including board bring-up, Wi-Fi/BLE/LoRa connectivity, I2C/SPI/UART/I2S drivers, watchdog handling, structured logging, and OTA-ready firmware organization. My background includes 25+ years in wireless communication and positioning R&D, including PHY/MAC-layer work, 3GPP/IEEE/ITU standardization, patented location technologies, and practical embedded implementation. I can help with SDR/RF capture, signal analysis, RF debugging, tracking/ranging/positioning prototypes, ESP32 firmware, wireless data streaming, sensor integration, and PC-side test tools. My development style is diagnostic-driven: reproduce the issue, instrument the system, isolate the root cause, and deliver a tested fix with clear validation steps.