Citation
Abstract
This article describes the performance of the all-digital data-transition tracking loop (DTTL) with coherent or noncoherent sampling. The effects of few samples per symbol and of noncommensurate sampling rates and symbol rates are addressed and analyzed. Their impacts on the loop phase-error variance and the mean time to lose lock (MTLL) are quantified through computer simulations. The analysis and preliminary simulations indicate that with three to four samples per symbol, the DTTL can track with negligible jitter because of the presence of Earth Doppler rate. Furthermore, the MTLL is also expected to be large enough to maintain lock over a Deep Space Network track.
Details
- Volume
- 42-99
- Published
- November 15, 1989
- Pages
- 60–71
- File Size
- 553.8 KB