This way, the performance of a channel equalizer of a digital system becomes the critical factor in {HEAD ~ the performance} of {TAIL ~ the system} as a whole 
of
This way , the performance of a channel equalizer of a digital system becomes the critical factor in { HEAD ~ the performance } of { TAIL ~ the system } as a whole
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH