Citation
Abstract
This article describes the frequency-acquisition performance of the Costas cross-over loop which is used in the Advanced Receiver II (ARX II) to perform Quadrature Phase Shift Keying (QPSK) carrier tracking. The performance of the Costas cross-over loop is compared to two other QPSK carrier tracking loops: the MAP estimation loop and the generalized Costas loop. Acquisition times and probabilities of acquisition as functions of both loop signal-to-noise ratio and frequencyoffset to loop-bandwidth ratio are obtained using computer simulations for both type-II and type-III loops. It is shown that even though the MAP loop results in the smallest squaring loss for all signal-to-noise ratios, the MAP loop is sometimes outperformed by the other two loops in terms of acquisition time and probability.
Details
- Volume
- 42-100
- Published
- February 15, 1990
- Pages
- 150–159
- File Size
- 421.3 KB