FSK modem modules for SDR using different linux API's
Patrick Khaile · SUNScholar (Stellenbosch University) · 2004
ENGLISH ABSTRACT: The purpose of this thesis is to implement the Frequency Shift Keying (FSK) modem modules for the Software Defined Radio (SDR), using different Linux sound Application Programming Interfaces (API's). The FSK modulation scheme, uses coherent detection with matched filters. The modules are implemented using the Linux operating system and the programming language used is C/C++. Simulation is performed first and then followed by implementation in real-time, using APIs. The APIs used are Open Sound System (OSS), Advanced Linux Sound Architecture (ALSA), Jack Audio Connection Kit (JACK) and PortAudio (PA). In real-time two computers are used, one acting as the modulator and the other as the demodulator. The two sound cards are connected by an audio cable. Results obtained using OSS, ALSA and JACK are satisfactory. Recommendations are subsequently made for the suitable API(s). Both ALSA and JACK are the best APIs for the implementation.