OFDM Signal Generation and Decoding using 16-QAM and 64-QAM Modulation

This documentation presents the implementation of OFDM signal generation and decoding utilizing 16-QAM and 64-QAM modulation schemes. The core implementation involves mapping input bits to QAM symbols using constellation mapping functions, followed by IFFT transformation to generate orthogonal subcarriers. A critical component includes adding cyclic prefixes to combat multipath interference. For decoding, the receiver performs synchronization, cyclic prefix removal, FFT transformation, and QAM demapping using maximum likelihood detection algorithms. OFDM's significance in wireless standards like WiMAX stems from its robustness against frequency-selective fading. By executing the model with varying SNR settings in the AWGN channel block, engineers can analyze BER performance, system robustness, and spectral efficiency under different channel conditions. This practical approach enables optimization of communication parameters and validation of system reliability through MATLAB-based simulations that include error rate calculation functions and constellation visualization tools.