For example, let carrier waves modulated by a radio call signal S1 coming from {HEAD ~ a radio base station} be received and demodulated by {TAIL ~ the radio reception unit} 14 
For example , let carrier waves modulated by a radio call signal S1 coming from { HEAD ~ a radio base station } be received and demodulated by { TAIL ~ the radio reception unit } 14
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH