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