| 摘要 |
A method is disclosed for demodulating binary differential phase shift keyed signals in the presence of carrier frequency uncertainties. In phase modulation, a data signal is impressed on a carrier frequency to produce a modulated signal. The modulated signal and a corresponding quadrature signal are input to a split delay line, wherein each half of the delay line provides a delay of one-half the data signal bit period. The modulated and the delayed signals are input to a summing junction to provide a combined output independent of the carrier frequency. Thus, the method of demodulation is insensitive to Doppler shifts and other carrier frequency offsets.
|
