The effect of in-phase and quadrature channel errors on digital quadrature demodulation is analyzed and an optimal digital filter design method is selected.

This paper introduces a new system for measuring the fluctuation of radar RF pulse series by using IF quadrature dual channel, and gives theoretic analysis of this system.

The offset quadrature phase-shift-keyed(OQPSK) is an effective digital constant envelope modulation for band-limited nonlinear channel.