Patent ID: 6295325
Filing Date: 2001-09-25
Classification: H04L

Abstract:
A timing recovery loop, comprisinga filter adapted to receive In-Phase and Quadrature components of a received signal and to provide filtering to produce filtered In-Phase components and filtered Quadrature components;a squarer adapted to receive said filtered In-Phase components and said filtered Quadrature components and produce first and second squared outputs;a de-rotating integrator adapted to receive and de-rotate said first and second squared outputs, and to accumulate a squared complex signal;a phase estimator adapted to receive said squared complex signal and generate a phase error estimate;a phase locked loop adapted to receive and track said phase error estimate;a sample epoch estimator coupled to an output of said phase locked loop, adapted to produce a sample epoch based on a phase error estimate and a target baud rate; andan interpolator/decimator adapted to respond to said sample epoch by producing an interpolated sample between actual samples of a stream of samples, said interpolated sample, in combination with other interpolated samples, providing an interpolated sample stream at a rate equal to a multiple of said target baud rate.