Receiver for a data signal which includes data symbols occurring

Details Receiver for a data signal which includes data symbols occurring Receiver for a data signal which includes data symbols occurring

1991-06-14

1994-01-04

Chin, Stephen

Pulse or digital communications

Spread spectrum

Direct sequence

375101, H04L 7027

Patent

active

052767116

ABSTRACT:
A receiver for receiving data signals which include data symbols C(k) having a symbol Baud rate. A local oscillator generates a local Baud rate clock for sampling a received signal, a symbol detector recovers the symbols C(k) from the signal samples, and an arithmetic processor circuit derives for each sample an error signal e(k) which is a measure of the phase difference between the local Baud rate clock and the symbol Baud rate clock of the received signal. A reference circuit generates a reference signal V.sub.r (k) which is proportional to the amplitude of the received symbols. The receiver further includes a control circuit (11) for forming from the signals C(k), e(k) and V.sub.r (k) a pair of control signals .DELTA.F and .DELTA..phi. which adjust the frequency and phase of the clock oscillator so as to reduce the aforesaid phase difference. In order to avoid phase and frequency oscillations due to such adjustment, the frequency of the clock oscillator is maintained unchanged when the absolute value of the clock phase difference is decreasing, or is changed so as to slow down such decrease.

REFERENCES:
patent: 4615038 (1986-09-01), Lim et al.
patent: 4896334 (1990-01-01), Sayar
patent: 4905254 (1990-02-01), Bergmans
patent: 4959845 (1990-09-01), Tol et al.

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