In mobile radio receivers, the transmission power must be raised before the start of the transmission process, and must be reduced again after {HEAD ~ the end} of {TAIL ~ the transmission process} 
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In mobile radio receivers , the transmission power must be raised before the start of the transmission process , and must be reduced again after { HEAD ~ the end } of { TAIL ~ the transmission process }
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 REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL