a multicarrier transceiver operable to receive, during user data transmission or reception, a message that includes the channel measurement information and to demodulate bits in {TAIL ~ the message} using {HEAD ~ Quadrature Amplitude Modulation} , 
a multicarrier transceiver operable to receive , during user data transmission or reception , a message that includes the channel measurement information and to demodulate bits in { TAIL ~ the message } using { HEAD ~ Quadrature Amplitude Modulation } ,
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 TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH