Timing recovery technique

Details Timing recovery technique Timing recovery technique

1980-09-08

1982-06-08

Britton, Howard

Pulse or digital communications

Spread spectrum

Direct sequence

333 18, 364724, 375 13, 375 15, H04B 304

Patent

active

043343139

ABSTRACT:
In a first data receiver (10), sampling circuitry (20, 25, 35) forms samples of a received data signal representing a succession of data symbols. The samples are formed at twice the symbol rate. Transversal filter circuitry (251, 261) operates on the samples by multiplying them by respective ones of a queue of coefficients. Further circuitry (55, 60, 65, 70, 252, 262), operative in response to the resulting products, forms decisions as to the values of the transmitted symbols and updates the values of the coefficients. Timing recovery circuitry (40) periodically identifies the largest of the coefficients in magnitude and either advances or retards the operation of the sampling circuitry by a fixed step size depending on whether that coefficient is or is not within a predetermined portion of the queue. Timing recovery circuitry (830) within a second data receiver (100) operates in a similar manner, but employs a step size whose magnitude is determined by the position of the largest coefficient relative to the center of the coefficient queue.

REFERENCES:
patent: 4004226 (1977-01-01), Qureshi
patent: 4237554 (1980-12-01), Gitlin
Bell System Tech. Journal, vol. 54, No. 3, Mar. 1975, pp. 569-593, "Timing Recovery and Scramblers in Data Transmission".
IEEE Trans. of Communications, vol. COM-24, No. 8, Aug. 1976, pp. 856-864, "Fractional Tap-Spacing Equalizer and Consequences for Clock Recovery in Data Modems."

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