METHOD AND APPARATUS FOR EXTRACTING THE QUADRATURE COMPONENT OF A COMPLEX SIGNAL FROM THE IN-PHASE COMPONENT AFTER BASEBAND DIGITIZING USING A COMPLEX TRANSFORM

摘要

A method and apparatus for a receiver system in a receiver that includes at least two front end branches, each branch having its own intermediate frequency (IF) mixer to shift a received signal to an IF. When receiving multiple independent signals, the signals are digitized and the receiver performs a digital complex transform on each signal to obtain the corresponding quadrature component. When receiving a single signal the signal is routed to two mixers that are 90 degrees out of phase to obtain the quadrature signal components in the analog section of the receiver.