Patent ID: 7359467
Filing Date: 2008-04-15
Classification: H04L

Abstract:
1. A method for improving quality of receiver symbol synchronization on a digital communication connection, in which: a signal modulated according to one of the following line codes: quadrature amplitude modulation and carrierless amplitude and phase modulation, is passed over the digital communication connection and is received, distortion caused by the digital communication connection to the received signal is compensated with an adaptive linear equalizer, and symbols are recovered from the compensated received signal with a detector, the method comprising: generating a control signal that is proportional to rotation of a vector formed by an In-phase component and a Quadrature component of an input signal of the detector, generating an additional signal that is proportional to a timing phase of the receiver symbol synchronization, wherein, at timings of said receiver symbol synchronization, said additional signal is not affected while compensating for timing phase drift in said received signal, and controlling the receiver symbol synchronization on the basis of a combination of said control signal and said additional signal.