Offline Analysis of High Frequency Digital Signal

This project highlights the significant of the high frequency (HF) communication systems in the field of communications. With a frequency spectrum between 3 MHz to 30 MHz an ionosphere reflects this signal frequency range very well. Hence, the HF communication can be applied well in long distance transmission. HF communication is currently applied in radio communications, but applications are still limited due to noise, limiting its usefulness. Taking these factors into consideration, the idea is to enhance this application technology. For this to work, an application system to analysis HF signal is developed. The system is capable of analyzing and improving the quality of HF signal. The system is operated in offline mode. Using the periodogram and spectrogram technique, the signal can be analyzed. Signal information such as frequency, energy and the duration can then be determined. In addition, the modulation type of the signal and the bit rate can also be determined. The Graphic User Interface (GUI) of the system is developed for end-user ease of use.