The simulation of multi-amplitude level signal bit error rate and the relationship between SNR, the system block diagram above. Assumption consider the magnitude of level 8, then according to the process you first need to use a random number generator in (0,1) uniform random number, then (0,1) interval is divided into uniform (0,0.125), (0.125 , 0.25), (0.25,0.375), (0.375,0.5), (0.5,0.625), (0.625,0.75), (0.75,0.875), (0.875,1) These sub-intervals, and corresponding to a symbol 3bit 000,001,010,011,100,101,110,111, and then are mapped to-7d,-5d,-3d,-d, d, 3d, 5d, 7d on the amplitude level. After the Gaussian random number with the amplitude level overlay (Gaussian noise of variance controlled by the input signal to noise ratio) to generate a random rate r. By comparison with the determined threshold value to determine the sign of r, and then compared with the input symbol, if the range is that this symbol transmission error. This study assumes that the signal sent 10000, send an error

多幅度信号差错率（误比特率）仿真\Pe_SNR.m
................................\Qfunc.m
................................\simulinkPe.m
................................\white_gauss.m
多幅度信号差错率（误比特率）仿真

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