Pulse or digital communications – Pulse position – frequency – or spacing modulation
Patent
1992-12-07
1995-05-16
Chin, Stephen
Pulse or digital communications
Pulse position, frequency, or spacing modulation
375316, H03K 704, H03K 904
Patent
active
054168007
ABSTRACT:
A mobile radio receiver for a digital radio transmission system includes a recognition arrangement (6) for searching a received digital signal for pulses (i) of a frequency correction burst which recurs with a predetermined frequency in the digital signal and for determining the pulse positions (t). A frequency estimation arrangement (7) derives estimates of the predetermined frequency. In order to improve the initial synchronization of the mobile radio receiver with a base station, the recognition arrangement includes an averaging circuit (14) which averages with weight factors (Us) the pulse positions (t) that have been determined in successive observation intervals, the weight factors (Us) being proportional to the individual pulse heights (U). The reliability of recognition of pulses which belong a frequency correction burst is improved by providing evaluation based on the number of pulses of amplitudes above a selected threshold level during a selected interval, and further evaluation based on a phase error quality of the frequency estimates of the predetermined frequency.
REFERENCES:
patent: 5191598 (1993-03-01), Backstrom et al.
Georg Frank and Wolfgang Koch, "Anfangssynchronisation der Mobilstation im D-Netz", PKI Technische Mitteilungen Jan. 1990, pp. 43-49.
Chin Stephen
Eason Leroy
Kobayashi Duane
U.S. Philips Corporation
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