Receiver of a system for transmitting data symbols at a given ba

Details Receiver of a system for transmitting data symbols at a given ba Receiver of a system for transmitting data symbols at a given ba

1989-02-09

1990-09-25

Olms, Douglas W.

Pulse or digital communications

Spread spectrum

Direct sequence

375108, H04L 7027

Patent

active

049598457

ABSTRACT:
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).c(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).c(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 means value [u(k)] is situated in a zone whose boundaries [.+-..sub.V r(k)/N] are determined by a given fraction (1/N, N>1) of the level [V.sub.r (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.

REFERENCES:
patent: 3761818 (1973-09-01), Tazaki et al.
patent: 4376309 (1983-03-01), Fenderson et al.

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