Patent ID: 7587003

Claim:
A computer-implemented method for carrier-frequency synchronization of a carrier signal (e j(2π(f T +Δf)t+Δφ) ) affected by a frequency offset or a phase offset (Δf, Δφ) comprising: receiving a vestigial-sideband-modulated signal (r VSB (t)); converting the received signal into a modified vestigial-sideband-modulated received signal (x VSB ′(t′)) with time-discrete, complex rotating phasors (|A(t′)|·e j2(2πΔf·t′+Δφ) ), in which only the time-discrete phases (2·(2πΔft′+Δφ)) are dependent upon the frequency offset or phase offset (Δf, Δφ); and performing a maximum-likelihood estimation of the frequency and phase offsets using the time-discrete, complex rotating phasors, wherein the time-discrete phases (2·(2πΔft′+Δφ)) of the complex rotating phasors (|A(t′)|·e j2(2πΔf·t′+Δφ) ), of the modified vestigial-sideband-modulated received signal (x VSB ′(t′)), are dependent only upon the frequency offset or phase offset (Δf, Δφ), and the symbol duration (T VSB ) of the vestigial-sideband-modulated received signal (r VSB (t)) is half of the symbol duration (T S ) of the received signal (r(t′)).