In some aspects, the present invention includes {HEAD ~ systems} and methods which may compute {TAIL ~ MIMO channel metrics} 
In some aspects , the present invention includes { HEAD ~ systems } and methods which may compute { TAIL ~ MIMO channel metrics }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL