Pulse or digital communications – Repeaters – Testing
Patent
1992-02-18
1994-03-01
Kuntz, Curtis
Pulse or digital communications
Repeaters
Testing
375100, 455133, H04B 710, H04L 102
Patent
active
052915190
ABSTRACT:
A reference voltage (V.sub.ref) is set to a received signal level corresponding to an anticipated data error rate and compared with outputs of intermediate frequency amplifiers (3-1, 3-2) by comparators (7-1, 7-2). When the outputs of the intermediate frequency amplifiers (3- 1, 3-2) are lower than the reference voltage (V.sub.ref), operation of receiving circuits (A12-1, B12-2) is stopped. At inter symbol interference amount calculating sections (6-1, 6-2), inter symbol interference amounts are calculated from auto-correlation parameters of preamble signal bit trains included in received signal data, and selectors (9-1, 9-2) are controlled so that a diversity branch having the least residual inter symbol interference amount or the highest S/N ratio is selected and the received signal data of the selected branch are inputted to an equalizing section (11). When a signal having a high data error rate is received, operation of the corresponding receiving circuit is stopped. Consequently, power consumption is minimized, the data error rate caused by residual inter symbol interferences is minimized and data errors caused by thermal noises and other factors are also improved.
REFERENCES:
patent: 4715048 (1987-12-01), Masamura
patent: 4733402 (1988-03-01), Monsen
patent: 4742563 (1988-05-01), Fukumura
patent: 5065411 (1991-11-01), Muto
patent: 5127025 (1992-06-01), Okanoue
Kuntz Curtis
NEC Corporation
Tse Young
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