Simulation of 16-QAM Modulation and Demodulation System

This Simulink model simulates a complete 16-QAM modulation and demodulation system. A root-raised cosine pulse-shaped signal undergoes modulation and serves as input to the demodulator. The received signal is demodulated and passed to a detector subsystem where matched filtering and downsampling operations are performed. The model allows observation of symbol timing offset effects by adjusting the phase parameter in the downsampling operation. The detector output successfully recovers the originally transmitted signal with proper synchronization.

The modular design enables extension to analyze other modulation schemes like 8-QAM and QPSK through parameter modifications. System performance metrics including bit error rate (BER) and bandwidth efficiency can be evaluated using built-in measurement blocks. The model incorporates configurable channel conditions to compare transmission performance across different modulation techniques under various SNR scenarios. Implementation highlights include raised cosine filter design using comm.RaisedCosineTransmitter system object and symbol synchronization via comm.SymbolSynchronizer functionality.