H - Electricity – 04 – L
Patent
H - Electricity
04
L
340/72
H04L 27/22 (2006.01) H04L 27/233 (2006.01)
Patent
CA 1107371
ADAPTIVE PHASE DETECTION METHOD AND APPARATUS ABSTRACT An adaptive phase detection method and apparatus which provides an estimated value ?n of the phase ?n transmitted at signaling instant nT in a data transmission system using a M-phase PSK modulation tech- nique, and compensates for the effects of the intersymbol interference created by not more than one leading lobe and an arbitrary number of trailing lobes of the impulse response of the transmission channel. The method of the present invention mainly comprises the steps of: ? determining at least two residual errors, each of which is obtained by subtracting from the phase Tn received at signaling instant nT one of the possible values which can be taken on by the signal transmitted at each signaling instant, i.e. one of the phases of the constellation, and an estimated value of the phase error due to the intersymbol interference and corresponding to that phase of the constellation, ? comparing the residual errors thus obtained with each other, ? deciding that the phase ?n with the maximum likelihood of being phase ?n is that phase of the constellation which yields the smal- lest of the residual errors, and ? selectively adjusting the estimated phase errors in accordance with the residual errors. FR9-76-011 - 1 -
289579
Godard Dominique N.
Milewski Andrzej T.
International Business Machines Corporation
Na
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