Pulse or digital communications – Transceivers – Modems
Patent
1997-03-31
1999-12-07
Chin, Stephen
Pulse or digital communications
Transceivers
Modems
375219, 375221, H04B 138, H04L 516
Patent
active
059995645
ABSTRACT:
For use with a central communications device digitally-coupled to a digital telecommunications network that includes an analog interface having an analog-to-digital converter ("ADC"), a system and method for iteratively determining quantization intervals of the ADC and a modulator/demodulator ("modem") employing the system or the method. The system includes: (1) a signal generator, coupled to an input of the ADC, that generates a sequence of analog signals to be quantized by the ADC to yield resulting symbols for reception into the central communications device and (2) an analyzer, that receives a return signal from the central communications device, the return signal indicating comparisons by the central communications device of the resulting symbols with expected symbols, the comparisons allowing the analyzer to determine threshold values between the quantization intervals of the ADC, the quantization intervals being a function of the threshold values.
REFERENCES:
patent: 5394437 (1995-02-01), Ayanoglu et al.
patent: 5406583 (1995-04-01), Dagdeviren
patent: 5528625 (1996-06-01), Ayanoglu et al.
Chin Stephen
Lucent Technologies - Inc.
Phu Phuong
LandOfFree
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