Performance of a Phase Comparison Spread Spectrum Receiver.

摘要

A phase comparison receiver is implemented at baseband with charge-coupled device (CCD) correlators as matched filters. The received signal is pseudo-noise (PN) phase coded spread spectrum waveform. The effects of doppler-induced frequency instabilities on the probability of error performance is examined with the differential phase modeled as a Gaussian process. Numerical results are presented and when the variance is greater than .1 radians-squared the performance degrades rapidly. An analytic approximation is given for probability of error for specific cases and is useful for small values of variance and low signal-to-noise ratios. In the limit when the variance approaches zero, the receiver performance expression is equivalent to the differentially coherent phase shift keyed (DPSK) receiver. If the reference is perfect in addition to the zero phase variance the performance is the same as a phase coherent receiver with a perfect reference. (Author)