a component configured to provide {TAIL ~ a local oscillator signal} using a sample of {HEAD ~ a transmitter signal}; and 
a component configured to provide { TAIL ~ a local oscillator signal } using a sample of { HEAD ~ a transmitter signal } ; and
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH