Circuit for obtaining accurate timing information from received

Details Circuit for obtaining accurate timing information from received Circuit for obtaining accurate timing information from received

1989-03-20

1991-10-08

Chin, Stephen

Pulse or digital communications

Spread spectrum

Direct sequence

375119, 307510, H04L 700

Patent

active

050561219

ABSTRACT:
A circuit for obtaining accurate timing information from a received signal, first, obtains an impulse response at a certain phase, which phase is determined based on a reference phase of a receiver clock, and then the obtained impulse response is compared with a reference level. As the reference level: a predetermined value just below the maximum value of the overall impulse response; an impulse response at another phase; or an impulse response at the same phase in a previous period, is used. The reference phase is controlled, according to the result of the comparison.

REFERENCES:
patent: 4455665 (1984-06-01), Kromer, III
patent: 4475214 (1918-10-01), Gutleber
patent: 4583048 (1986-04-01), Gumacos et al.
patent: 4694468 (1987-09-01), Cullum
patent: 4769816 (1988-09-01), Hochstadt et al.
Mueller, K. H. et al., "Timing Recovery in Digital Syuchronous Data Receivers" IEEE Transaction of Communications, vol. COM-24, No. 5, May 1976, pp. 516-531.

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