Circuit for measuring transmission quality of demodulated digita

Details Circuit for measuring transmission quality of demodulated digita Circuit for measuring transmission quality of demodulated digita

1997-12-18

2000-02-01

Pham, Chi H.

Pulse or digital communications

Testing

329309, 4552261, H04B 1700, H03D 300

Patent

active

060211598

ABSTRACT:
A circuit for measuring a carrier-to-noise ratio or a bit error rate of demodulated I and Q digital signals obtained by demodulating an input carrier wave which is modulated and transmitted under a carrier modulation transmission system including a discriminating circuit for producing a discrimination signal each time the demodulated digital signal comes within predetermined windows set on a signal space of the I and Q signals, a counter for counting the discrimination signals during a predetermined time interval, and a calculating circuit for calculating a carrier-to-noise ratio or bit error rate in accordance with a count value with reference to a previously stored relationship between count values and carrier-to-noise ratios or bit error rates.

REFERENCES:
patent: 4696957 (1987-09-01), Otani
patent: 5202643 (1993-04-01), Sato
patent: 5317599 (1994-05-01), Obata
patent: 5450623 (1995-09-01), Yokoyama et al.

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