Process for providing a pilot aided phase recovery of a carrier

Details Process for providing a pilot aided phase recovery of a carrier Process for providing a pilot aided phase recovery of a carrier

H - Electricity

04

L

H04L 7/04 (2006.01) H04B 7/005 (2006.01) H04L 27/00 (2006.01)

Patent

CA 2475895

The Invention relates to a process for providing a pilot aided phase recovery of a carrier of an input digital signal, said signal Zk comprising signal fields comprised of L S symbol signals, namely a block of L P pilot symbol signals Z P (k) and a data field of (L S -L P) data symbol signals Z d (k), and characterized in that it comprises for each signal field (l): - calculating an unwrapped pilot phase estimate ~ .function. (P) (l). - initiating with ~ .function. (P) (l) a first digital phase locked loop (DPLL F) implementing a phase estimate algorithm and calculating a forward phase trajectory ~ F (k) from the data symbol signals Z d (k) of the data field, ks varying between l and L S - L P over said data field (l), said forward phase trajectory ~ F (P) (l) being comprised of L S - L P forward phase estimates ~ F (ks). - and initiating with ~(P) .function. {I + l} a second digital phase locked loop (DPLL B), implementing a phase estimate algorithm and calculating a backward phase trajectory ~ B (ks) from the data symbol signals Z d(k), ks varying between L s- L P and 1 over said data field (l), said backward phase trajectory ~ B (ks) being comprised of L S - L P) backward phase estimates ~ B (ks). - from said phase trajectories calculating a phase correction (e-j~(ks).

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