| The way I read this, you're talking about dead notes, not ghost notes. Someone correct me if I'm wrong please, but I believe ghost notes and dead notes are two different things.
For the technique, just don't mute your string with only 1 finger. When you pluck your stirng for the dead note, to make sure you don't get an harmonic, mute the string with at least 2 fingers that are far enough from one another.
Lets say you play on your 5th fret.
5--x--x--5--5--5--x--x or whatever beat you like.
If you only put a finger on the 5th to mute your string for the dead notes, you'll obviously get the +2 octaves harmonic of the string. So to fix this, simply fret the 5 with your pinky and leave your other fingers on the string on the lower frets, they'll mute the harmonic and thus, the whole string.
You can also work another way of doing it by fretting the 5 with your index and dropping your other fingers on the string only when you play the dead note.
Just keep in mind to always use more than one finger to mute a string for a dead note.
__________________
- H E D N I S K H J Ä R T A D -
| 
