H - Electricity – 04 – L
Patent
H - Electricity
04
L
354/141, 328/87
H04L 5/22 (2006.01) H04J 3/06 (2006.01) H04L 7/00 (2006.01) H04L 7/02 (2006.01) H04L 7/04 (2006.01)
Patent
CA 1299680
72430-75 Abstract The received "unique word" contains both the frame clock and the character clock. On the transmission path, the unique word is distorted in a particular manner. If this distorted unique word is sampled with a phase-error-containing sampling clock, the phase error can be determined from the sample values. During the distortion on the transmission path, however, the characters preceding and following the unique word cause preoscillations and postoscillations, which are superimposed on, and complicate the evaluation of, the unique word. In the prior art, such preoscillations and postoscillations are taken into account by averaging over several frames. According to the fundamental idea of the invention, the values of the preoscillations and postoscillations at the sampling instants are calculated and subtracted as correction values from the measured sample values, so that only the influence of the distorted unique word remains. Usable control information for adjusting the phase of the sampling clock is thus derived already from the first detected unique word. Advantageously, however, quantities derived from the sample values rather than the sample values themselves are corrected by derived correction values. The values of the preoscillations and postoscillations are derived from the regenerated characters by means of the transmission coefficients of the transmission path. The transmission coefficients are either preset or derived from the equalization coefficients of an adaptive equalizer.
568668
Alcatel N.v.
Smart & Biggar
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