Arrangement for receiving digital data comprising an arrangement

Details Arrangement for receiving digital data comprising an arrangement Arrangement for receiving digital data comprising an arrangement

1985-09-26

1987-05-26

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375106119, H04B 304, H04L 708

Patent

active

046690921

ABSTRACT:
A digital data receiving arrangement, which adapts itself to channel variations of a transmission system, comprises an adaptive receiver stage (11), having an adaptive equalizer and at least one sampler, and producing, at a certain rate, complex samples y.sub.k from the input signal x(t), a decision circuit (14) supplying detected complex samples a.sub.k and an adaptive timing recovery circuit (12) determining the optimal sampling instant by minimizing a quadratic function J which represents the difference between y.sub.k and a.sub.k. The adaptive timing recovery circuit comprises a device (121) for shaping a primary clock signal in accordance with a secondary clock signal, whose period is twice the period of the primary clock and whose consecutive ascending edges are spaced in time by T.sub.1 and T.sub.2, said secondary clock producing alternately two sampling instants .tau. and .tau.+.DELTA..tau.. By minimizing the function J, on the basis of the difference determined for two instants .tau..sub.k and .tau..sub.k +.DELTA..tau., the control of the timing recovery is defined for the consecutive sampling instants .tau..sub.k and .tau..sub.k+1.

REFERENCES:
patent: 4146840 (1979-03-01), McRae et al.
patent: 4334313 (1982-06-01), Gitlin et al.
patent: 4535443 (1985-08-01), Korevaar
patent: 4577329 (1986-03-01), Brie et al.
IEEE Transactions on Communication Technology, vol. COM-19, No. 3, Jun. 1971, pp. 268-280, "Simultaneous Adaptive Estimation and Decision Algorithm for Carrier Modulated Data Transmission Systems", Hisashi Kobayashi.

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