Method and apparatus for modifying a decision-directed clock rec

Details Method and apparatus for modifying a decision-directed clock rec Method and apparatus for modifying a decision-directed clock rec

1992-03-27

1993-10-19

Kuntz, Curtis

Pulse or digital communications

Spread spectrum

Direct sequence

375108, 375118, H04L 700, H04L 2536, H04L 2540

Patent

active

052552926

ABSTRACT:
The present disclosure includes a discussion of a decision-directed clock recovery system which includes circuitry to prevent false-locking and accelerate acquisition on a known symbol patterns. The clock recovery system has at least two control circuits. Each control circuit has an effective bandwidth and also generates a clock signal. The clock recovery system samples the received data signal using the two clock signals, forming a corresponding first and second sampled signal. The sampled signals are used to generate corresponding symbol decisions. The symbol decision signals are processed to detect a known symbol pattern in the received data signal. Upon detection of the known bit sequence, the characteristics of the clock recovery system are modified, namely, the effective bandwidth of the control circuits are modified.

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patent: 4821297 (1989-04-01), Bergmann et al.
patent: 4890299 (1989-12-01), Dolivo et al.
patent: 4953185 (1990-08-01), Goode

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