Feedback from one or more receivers may be used by a transmitter to improve quality, capacity, and {HEAD ~ scheduling} in {TAIL ~ MIMO OFDM communication systems} 
in
Feedback from one or more receivers may be used by a transmitter to improve quality , capacity , and { HEAD ~ scheduling } in { TAIL ~ MIMO OFDM communication systems }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL