Pilot based carrier synchronization scheme e

摘要

The Invention relates to a process for providing a phase synchronization of a pilot aided carrier of an input digital signal, said signal Zk comprising signal fields comprised of Ls symbol signals, namely a block of LP pilot symbol signals ZP(k) and a data field of (Ls -LP) data symbol signals Zd(k), and characterized in that it comprises for each signal field (l) :calculating an unwrapped pilot phase estimate θ̂(p)f(l).initiating with θ̂(p)f(l) a first digital phase locked loop (DPLLF) implementing a phase estimate algorithm and calculating a forward phase trajectory θ̂F(k) from the data symbol signals Zd(k) of the data field, ks varying between 1 and Ls-LP over said data field (l), said forward phase trajectory θ̂(P)F(l) being comprised of Ls-LP forward phase estimates θ̂F(ks).and initiating with θ̂(P)f(l + 1) a second digital phase locked loop (DPLLB), implementing a phase estimate algorithm and calculating a backward phase trajectory θ̂B(ks) from the data symbol signals Zd(k), ks varying between Ls-LP and 1 over said data field (l), said backward phase trajectory θ̂B(ks) being comprised of Ls-LP) backward phase estimates θ̂B(ks).from said phase trajectories calculating a phase correction.