In some exemplary embodiments, normalized symbol estimates or {HEAD ~ MMSE symbol estimates} are scaled to produce maximum likelihood estimates for {TAIL ~ decoding} 
In some exemplary embodiments , normalized symbol estimates or { HEAD ~ MMSE symbol estimates } are scaled to produce maximum likelihood estimates for { TAIL ~ decoding }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL