Alamouti Coding Scheme Implementation

Main function Alamouti(Nr, max_snr, max_err_symbol, symbol_per_frame) implements the Alamouti space-time coding scheme with the following components: QpskMapping(psudo_bit_sequence) - converts binary data to QPSK modulated symbols; RayleighCH(Nr, Nt) - simulates Rayleigh fading channel characteristics. Example usage: Alamouti(1, 12, 20, 24). Key parameters: 2 transmit antennas and 1 receive antenna configuration, SNR range from 0dB to 12dB, simulation stops when symbol errors exceed 20 at each SNR point, with 24 QPSK symbols per frame.

Image Encryption Using Logistic Chaotic Mapping with Binary Data Conversion

This image encryption method based on Logistic chaotic mapping converts image data into binary format, generates chaotic sequences using the Logistic map, applies threshold-based binarization to create binary sequences, and implements encryption through logical operations between binary image data and chaotic binary sequences.