QPSK/BPSK demodulator

Details QPSK/BPSK demodulator QPSK/BPSK demodulator

1988-03-30

1989-05-23

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329124, 375 83, 375 87, H04L 2722

Patent

active

048334162

ABSTRACT:
A quadraphase shift keyed (QPSK) demodulator employs a pseudo data estimation loop for reducing the loop gain variation. This demodulator has a feedback loop to minimize the cross-coupling between the i anf q channels. This demodulator also provides as outputs the signals representing the amplitude of i and q channels. In addition, by eliminating amplification of some of the internally generated signals, this demodulator may serve as a biphase shift keyed (BPSK) demodulator.

REFERENCES:
patent: 4053837 (1977-10-01), Ryan et al.
patent: 4085378 (1978-04-01), Ryan et al.
patent: 4092606 (1978-05-01), Ryan
patent: 4359692 (1982-11-01), Ryan

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