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If the input channel of the symbols, such as concept, for the channel mutual information- painting a different signal to noise ratio of the mutual information quantity curve, in M for parameters and draw a cluster of curves (which plus a AWGN channel capacity curves for comparison)- adjustment function a=f (x), so that when x =si. B a=iA-, B also is a real constant, unchanged in a and sigma, mutual information quantity changes with B is what trend? The influence of the value of B on the mutual information and the change curve of the signal to noise ratio