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

2008-07-08

2008-07-08

Payne, David C. (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

C348S385100

Reexamination Certificate

active

07397869

ABSTRACT:
Providing a pilot aided phase recovery of a carrier of an input digital signal Zkhaving signal fields of Lssymbol signals, LPpilot symbol signals ZP(k)and (Ls−LP) data symbol signals Zd(k), by for each signal field:calculating an unwrapped pilot phase estimate {circumflex over (θ)}f(P)(l);initiating with {circumflex over (θ)}f(P)(l) a first digital phase locked loop implementing a phase estimate algorithm and calculating a forward phase trajectory {circumflex over (θ)}F(k) from Zd(k), ks varying between 1 and Ls−LPover the data field (l), {circumflex over (θ)}F(P)(l) having Ls−LPforward phase estimates {circumflex over (θ)}F(ks);and initiating with {circumflex over (θ)}(P)f(l+1) a second digital phase locked loop, implementing a phase estimate algorithm and calculating a backward phase trajectory {circumflex over (θ)}B(ks) from Zd(k), ks varying between Ls−LPand 1 over said data field (l), {circumflex over (θ)}B(ks) having Ls−LPbackward phase estimates {circumflex over (θ)}B(ks); andfrom said phase trajectories calculating a phase correction (e−j{circumflex over (θ)}(ks)).

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