{HEAD ~ Real world effects} such as filtering, multipath time spread, and time base error destroy orthogonality and introduce {TAIL ~ a degree} of cross coupling between supposedly orthogonal channels 
{ HEAD ~ Real world effects } such as filtering , multipath time spread , and time base error destroy orthogonality and introduce { TAIL ~ a degree } of cross coupling between supposedly orthogonal channels
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH