wherein {HEAD ~ the transceiver} performs triangle wave modulation and {TAIL ~ continuous transmission} and reception, 
performs
wherein { HEAD ~ the transceiver } performs triangle wave modulation and { TAIL ~ continuous transmission } and reception ,
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH