{TAIL ~ The base station} 20, wherein {HEAD ~ each} of the plurality of mobile stations has a corresponding reference signal 
{ TAIL ~ The base station } 20 , wherein { HEAD ~ each } of the plurality of mobile stations has a corresponding reference signal
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH