Before revision: For received signals, by determining how much in-phase carrier and how much quadrature carrier is present in the signal it is possible represent that signal using in-phase and quadrature components, so IQ data can get generated from a signal with reference to a carrier sine wave.
After revision: toFor received signals, by determining how much in-phase carrier and how much quadrature carrier is present in the signal it is possible represent that signal using in-phase and quadrature components, so IQ data can get generated from a signal with reference to a carrier sine wave.