Polyphase Filter and Demodulation Techniques for Optimizing Signal Collection Processing
Alfredo V. Irizarry · 2003
This document presents the development and implementation of a polyphase filter used for frequency demultiplexing as well as the evaluation of its performance compared to a baseline. A polyphase filter approach is an efficient method that performs frequency demultiplexing by means of decimation, filter reduction and the usage of the FFT algorithm. The development was made using Matlab and C++, The performance was measured in terms of execution speed as function of the filter parameters. The code has been embedded in a GUI that allows the user to go step by step in the design process, i.e., from filter design to audio extraction. The software also implements several demodulation techniques to complement the development.