Pulse or digital communications – Testing – Phase error or phase jitter
Reexamination Certificate
2004-02-19
2008-05-06
Ghayour, Mohammed (Department: 2611)
Pulse or digital communications
Testing
Phase error or phase jitter
Reexamination Certificate
active
07369606
ABSTRACT:
A method is presented for estimating a phase error for first (rI) and second (rQ) orthogonal signal components spread respectively by different first cIand second cQspreading codes. A cross-despread value IdQ and/or QdI is determined by despreading one signal component with the spreading codes associated with the other signal component (rIwith cQor rQwith cI). In parallel, the same signal component is also despread with its associated spreading code to determine an estimated data symbol for that component. An interference of Q into I or I into Q is calculated and multiplied by the estimated data symbol, and subtracted from the cross-despread value to achieve an estimate of phase error. Preferably, both cross-despread values are obtained, normalized to a common data rate, scaled to maximize signal to noise ratio, and combined into one phase error estimate. A phase error detector includes despreaders, multipliers, and adders to determine the cross-despread value and subtract the interference from it.
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Ertel Richard B.
Giallorenzi Thomas R.
Griffin Dan M.
Hall Eric K.
Harris Johnny M.
Ghayour Mohammed
Harrington & Smith PC
L-3 Communications Corporation
Matin Nurul M
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