Systems and techniques for generating data showing {HEAD ~ a signal environment} experienced by {TAIL ~ a radio frequency identification communication device} 
experienced by
Systems and techniques for generating data showing { HEAD ~ a signal environment } experienced by { TAIL ~ a radio frequency identification communication device }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL