H - Electricity – 04 – L
Patent
H - Electricity
04
L
340/205
H04L 7/00 (2006.01) H04L 7/02 (2006.01)
Patent
CA 1308793
PHE 88.002 16.06.1988 ABSTRACT: "A receiver of a system for transmitting data symbols at a given baud- rate." A receiver of a system for transmitting data symbols at a given baud-rate comprises a symbol detector (7) operating at the baud- rate 1/T and means (6) for optimally conditioning received data symbols for this symbol detection. From the received conditioned data signal [s(k)] a phase error signal [e(k-1).?(k)] is derived that is representative of a phase difference between a locally generated baud- rate clock signal and a baud-rate clock signal inherent to the received data symbols, and the receiver comprises means (11, 12) for the reduction of this phase difference step-by-step in response to the phase error signal [e(k - 1).?(k)]. This receiver further includes an accumulator (44) for determining the mean value [u(k)] of the phase error signal over a predetermined number (M) of symbol intervals and a detector (45) for establishing whether this mean value [u(k)] is situated in a zone whose boundaries [?Vr(k)/N] are determined by a given fraction (1/N, N > 1) of the level [Vr(k)] of the conditioned signal [s(k)], If the mean value [u(k)] of the phase error signal is situated in this zone, the process of shifting the phase of the local clock signal step-by-step is stopped.
591840
Tol Simon J.m.
Wouda Kornelis J.
At&t Network Systems International B.v.
Fetherstonhaugh & Co.
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