Automatic gain control in quadrature phase shift keying demodula

Details Automatic gain control in quadrature phase shift keying demodula Automatic gain control in quadrature phase shift keying demodula

1997-08-22

1999-08-17

Bocure, Tesfaldet

Pulse or digital communications

Receivers

Automatic gain control

375331, 455138, 455139, 4552341, H04L 2708

Patent

active

059404515

ABSTRACT:
An apparatus for automatic gain control (AGC) of a digital QPSK demodulator is disclosed. The apparatus for automatic gain control of a QPSK demodulator comprising a variable gain amplifier for controlling an amplification gain of a QPSK-demodulated signal by a predetermined gain control signal comprises a signal magnitude estimator for estimating the magnitude of I and Q-channel signals in the QPSK demodulator by using the equation S.sub.mag =MAX.vertline.I.vertline.,.vertline.Q.vertline.)+1/2MIN(.vertline.I.vertli ne.,.vertline.Q.vertline.), and a control signal generator for generating a gain control signal according to the magnitude of the input signal outputted from the signal magnitude estimator, and outputting the gain control signal to a variable gain amplifier. Through the construction of the present invention, which generates the magnitude of signal used to generate the control signal for AGC by square root approximation, the ASIC without the complex circuit structure can be easily implemented in digital QPSK demodulators.

REFERENCES:
patent: 5446761 (1995-08-01), Nag et al.
patent: 5550869 (1996-08-01), Guranzt et al.
patent: 5764689 (1998-06-01), Walley
patent: 5828692 (1998-10-01), Walley

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