A feedback frame receiving apparatus for receiving a feedback frame transmitted by a receiver in response to a data frame transmitted by a transmitter, wherein said {HEAD ~ data frame} transmitted by said transmitter and said feedback frame transmitted by said receiver have {TAIL ~ an identical format}, said apparatus comprising: 
have
A feedback frame receiving apparatus for receiving a feedback frame transmitted by a receiver in response to a data frame transmitted by a transmitter , wherein said { HEAD ~ data frame } transmitted by said transmitter and said feedback frame transmitted by said receiver have { TAIL ~ an identical format } , said apparatus comprising :
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH