| 摘要 |
A decision feedback equalizer is described wherein an approximate value alpha 0 of the phase of the signal being received at sampling time t0 is obtained by subtracting a phase error ( theta 0 - alpha 0) from the value theta 0 of the phase of the signal received at t0. Value DELTA 0 is fed to a decision logic which provides an estimated value DELTA 0 of the phase of the transmitted signal, which value is representative of the detected data. Value alpha 0 is fed to a decoder which provides its components in a Cartesian coordinates system. These components are fed to the inputs of a complex, cross-coupled equalizer which supplies the approximate values DELTA u0 and DELTA vO of the components, in a Cartesian coordinates system, of the distorting signal representative of all distortions introduced by the communication channel. The phase error ( theta 0 - alpha 0) is obtained from the relation SIN ( theta 0 - alpha 0) = DELTA U0 COS theta 0 - DELTA U0 SIN theta 0.
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