A transceiver within the communication device sweeps through a frequency range of interest in {HEAD ~ order} to receive {TAIL ~ signals} within the frequency range 
A transceiver within the communication device sweeps through a frequency range of interest in { HEAD ~ order } to receive { TAIL ~ signals } within the frequency range
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH