r_tuple_former.py 文件源码

def rootRaisedCosine(t):
    bit_period = 1/BIT_FREQUENCY

    if (t== bit_period/(4*BETA)):
        return (BETA/(np.pi*np.sqrt(2*bit_period)) * \
                ((np.pi + 2)*np.sin(np.pi/(4*BETA)) + (np.pi - 2)*np.cos(np.pi/(4*BETA))))
    else:
        return (4 * BETA / np.pi / np.sqrt(bit_period) * \
            (np.cos((1 + BETA) * np.pi * t / bit_period) + \
             (1 - BETA) * np.pi / (4 * BETA) * np.sinc((1-BETA)*t/bit_period)) / \
                (1 - (4*BETA*t/bit_period)**2))