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