Crosstalk reduction in unbalanced QPSK detectors

Details Crosstalk reduction in unbalanced QPSK detectors Crosstalk reduction in unbalanced QPSK detectors

1984-08-17

1986-04-08

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329112, 329145, 375 83, 375 99, 375101, 455295, H03D 318

Patent

active

045815860

ABSTRACT:
A method and apparatus for demodulating quadrature phase shift keyed (QPSK) signals in a manner which reduces crosstalk between channels. The in phase (I) data is recovered first by recovering the carrier frequency and then multiplying the carrier frequency by the QPSK signal. The I channel is contemplated to require higher power and thus the crosstalk error in the recovered I channel data is relatively small. The QPSK signal is then modulated with the recovered I channel data. The resulting signal is multiplied by a carrier in quadrature to the recovered carrier to produce a second signal in which the crosstalk component has been eliminated and which contains the quadrature (Q) channel data with the I channel modulation. The I channel modulation is removed by modulating the signal again by the I channel data to produce a signal containing only the Q channel data.

REFERENCES:
patent: 4085378 (1978-04-01), Ryan et al.
patent: 4092606 (1978-05-01), Ryan
patent: 4180779 (1979-12-01), Hook et al.
patent: 4250458 (1981-02-01), Richmond et al.
patent: 4359692 (1982-11-01), Ryan

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