Code to simulate QAM modulation and demodulation. Also has an AWGN function to add noise to symbols. A Rayleigh and Rice process are added as a part to simulate a complete communication system and uate its behavior. -Code to simulate QAM modulation and demodulation. Also has an AWGN function to add noise to symbols. A Rayleigh and Rice process are added as a part to simulate a complete communication system and　uate its behavior.