Phase controlled synchronization for direct sequence spread-spec

Details Phase controlled synchronization for direct sequence spread-spec Phase controlled synchronization for direct sequence spread-spec

1990-06-29

1992-03-31

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

380 34, 370 18, 375120, H04L 2730

Patent

active

051014173

ABSTRACT:
A receiver for a direct sequence spread-spectrum communication system of the type in which a transmitter mixes a clocked pseudo-random sequence with a modulated carrier for spreading the carrier energy across a wide band of frequencies, comprises a resident clock-driven pseudo-random code generator for locally generating an essentially identical, spectrum despreading code sequence; means for clocking the resident code generator at a nominal frequency which is offset in a predetermined sense from the clock frequency of the transmitted code sequence such that the phase of the locally generated code sequence tends to slide in one direction with respect to the phase of the transmitted code sequence; detection means for determining whether the locally generated and the transmitted code sequence are phase aligned or misaligned and for sensing their actual, incipient and/or predicted departures from a phase aligned state, and phase control means for adjusting the clock frequency for the resident code generator whenever such a departure is sensed, thereby shifting the phase of the locally generated code sequence in the opposite direction with respect to the transmitted code sequence by an amount which tends to restore the two code sequences to a phase aligned state.

REFERENCES:
patent: 4638494 (1987-01-01), Kartchner et al.
Ziemer et al, Digital Communications and Spread Spectrum Systems, (MacMillan, New York; 1985; pp. 312-314).

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