平方根升餘弦濾波器

1.Rcosfir：design a raised cosine FIR filter.（rcosfir是低通濾波用的，以便後面加載頻。）html       B = RCOSFIR(R, N_T, RATE, T) designs and returns a raised cosine FIR filter.函數    A raised cosine filter is typically us

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