QAM_eyediagrm.m QAM_rayleigh.m Rayl.m Rayleigh_channel.m serial_p.m test.m baseband siganl.fig BER.fig bit.fig constellation.fig filter.fig modulation.fig rayleigh.fig demod_QAM.m modulate_QAM.m parallel_s.m QAM_3.m QAM_constellation.m QAM_d.m