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