DCT and IDCT for Image Processing: Implementation of Information Sequence Embedding and Extraction
MATLAB implementation of information sequence embedding and extraction using DCT and IDCT transforms for digital images
Information Sequence Processing with FSK Modulation System
In this system, the information sequence undergoes FSK modulation first, followed by a low-pass filter with 25kHz cutoff frequency to constrain signal bandwidth. The filtered signal is then upconverted via a mixer to higher transmission frequencies. At the receiver, synchronized frequency-hopping signals perform downconversion (de-hopping occurs here), with lower sideband extraction preceding FSK demodulation. Implementation involves digital signal processing algorithms for modulation/demodulation and mixer operations using trigonometric functions.