Low timing sensitivity receiver structures for CAP

Carrierless amplitude and phase (CAP) is one of the modulation schemes that has been proposed to accomplish the task of transporting high bit-rate dat a over cheap copper wire pairs. In this paper, we reexamined some CAP recei ver structures that have been proposed in the literature and showed that th e modified quadrature amplitude modulation receiver can offer a significant advantage over the other receiver structures through its greater immunity to timing phase errors. Our recommendation is based on an analysis of the e ye diagram of a received CAP signal.