Adaptive threshold decision device for multistate modulation

Details Adaptive threshold decision device for multistate modulation Adaptive threshold decision device for multistate modulation

1994-04-28

1995-08-01

Chin, Stephen

Pulse or digital communications

Receivers

Automatic baseline or threshold adjustment

327 75, H04L 2506, H04L 2510

Patent

active

054385938

ABSTRACT:
An adaptive threshold decision device for multistate modulation produces, at a symbol frequency, symbols dependent on the levels of a received demodulated baseband signal. It comprises a voltage divider, an adder for adding the baseband signal to a midpoint voltage which is substantially the mean of lower and upper voltages applied to the terminals of the voltage divider to produce a transposed signal, plural comparators for comparing the transposed signal with plural voltages at terminals of the voltage divider thereby producing comparison result signals, an encoder for deriving control words according to the comparison result signals, and control circuits for respectively and independently controlling at least the lower and upper voltages according to the control words.

REFERENCES:
patent: 4602374 (1986-07-01), Nakanura et al.
patent: 5025456 (1991-06-01), Ota et al.
patent: 5119404 (1992-06-01), Aihara

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