{HEAD ~ 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 Quadrature Amplitude Modulation , 
{ HEAD ~ 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 Quadrature Amplitude Modulation ,
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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 OTH OTH OTH OTH