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noise on USB 5V due to leds switching

Hi,

We face with a 5V power supply problem. 

The 5V supply voltage is connected to our card from USB 5V. 

The 5V supply voltage  is used to power LDEs that are connected in parallel.

One side of the leds is connected to 5V and the other side is connected to FET that his gate controled by PWM signal.

Due to the low resistance of the leds there is noise signal on the 5V power supply and it's cause noise on the USB. 

How can I remove this noise signal?