Decision directed carrier recovery circuit using phase error det

Details Decision directed carrier recovery circuit using phase error det Decision directed carrier recovery circuit using phase error det

1994-12-20

1996-11-05

Tse, Young T.

Pulse or digital communications

Receivers

Angle modulation

375327, 375375, 327141, 327156, H03D 300, H03D 302, H03D 324

Patent

active

055725503

ABSTRACT:
A decision directed carrier recovery circuit comprising a demodulator for adjusting a frequency and a phase of an input carrier to demodulate an original signal therefrom, a signal decision unit for deciding an output signal from the demodulator as a specified symbol, and a phase error detector for receiving the output signal from the demodulation and an output signal from the signal decision unit and detecting an phase error between the received signals using bit shifting instead of division. The phase error detector includes a numerator calculator for receiving the output signal from the demodulator and the output signal from the signal decision unit and calculating a numerator of a phase error calculation expression on the basis of addition and multiplication, a logic combination unit for logically combining first and second components of the output signal from the signal decision unit, and a multiplexer for inputting through a plurality of input terminals values obtained by bit-shifting an output value from the numerator calculator respectively with respect to all possible values of a denominator of the phase error calculation expression and selecting one of the inputted values most approximate to an actual value in response to an output signal from the logic combination unit.

REFERENCES:
patent: 4466109 (1984-08-01), Sari
patent: 4871975 (1989-10-01), Nawata et al.
patent: 5150384 (1992-09-01), Cahill
patent: 5184091 (1993-02-01), Srivastava
patent: 5272730 (1993-12-01), Clark

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