Carrier-tracking loop performance for quaternary and binary PSK signals
Abstract
By expressing the open-loop response voltge as a Fourier series in terms of the phase-tracking error and then utilizing a very useful mean-value expression, the performance of loops suited to recovering the carrier of four-phase (quaternary) and two-phase (binary) phase-shift-keyed (QPSK and BPSK) signals are assessed. At high SNRs ratios they perform comparably, but at low SNRs the former's performance deteriorates much more rapidly. The loop's ability to maintain the carrier frequency despite the noise accompanying the PSK signal is measured by the mean and the variance of the oscillator's control voltage. In particular, Spilker's loop for QPSK and the Costas loop for BPSK signals are discussed.
- Publication:
-
IEEE Transactions on Aerospace Electronic Systems
- Pub Date:
- March 1983
- DOI:
- 10.1109/TAES.1983.309434
- Bibcode:
- 1983ITAES..19..162B
- Keywords:
-
- Communication Theory;
- Phase Locked Systems;
- Phase Shift Keying;
- Signal Detection;
- Binary Data;
- Block Diagrams;
- Fourier Series;
- Signal To Noise Ratios;
- Communications and Radar