求翻译：由图8可知，信噪比为-10dB～5dB时， QPSK信号的pf 值随着信噪比的增加而逐渐减小，信噪比为5dB～20dB时， QPSK信号的pf 值随着信噪比的增加而增大，但其pf 值一直大于3.46。是什么意思？

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As can be seen from figure 8, signal-to-noise ratio for -10 DB with maximum capacitive load to 5db, QPSK signal value pf signal-to-noise ratio is increased and the gradual decrease of SNR for 5db to 20db, QPSK signal value pf signal-to-noise ratio increases, but its value has been greater than 3.46

May know by Figure 8, when signal-to-noise ratio for - 10dB~5dB, QPSK the signal pf value reduces gradually along with the signal-to-noise ratio increase, when the signal-to-noise ratio is 5dB~20dB, QPSK the signal pf value increases along with the signal-to-noise ratio increase, but its pf value is

The figure 8 shows that, when the signal to noise ratio is -10dB~5dB, PF value of QPSK signals as the signal to noise ratio increases and decreases when the signal to noise ratio is 5dB~20dB, PF value of QPSK signals as the signal to noise ratio increases, but the PF value is consistently greater th

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