QPSK Demodulator with two-step quadrupler and/or time-multiplexi

Details QPSK Demodulator with two-step quadrupler and/or time-multiplexi QPSK Demodulator with two-step quadrupler and/or time-multiplexi

1978-09-21

1979-12-25

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

325320, 325346, 329122, H04L 2722

Patent

active

041807790

ABSTRACT:
A QPSK demodulator apparatus utilizing a pair of doubling units in tandem but separated by a bandpass filter to remove any undesired cross products and to eliminate possible noise signal that may be applied to the second doubler. The use of two doubling units to provide a times 4 quadrupling allows the use of heterodyning in order to operate at a lower frequency.

REFERENCES:
patent: 4097813 (1978-06-01), Otani et al.

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