Citation
Abstract
Analysis is presented of an all-digital technique for the coherent demodulation of a residual carrier signal with a biphase modulated square-wave subcarrier. The processing technique, proposed for use in the DSN advanced receiver, employs the concept of IF sampling. It also uses an optimum Costas loop for subcarrier demodulation and dataaided carrier tracking, i.e., combined Costas and residual carrier tracking. It is shown that the loops perform essentially the same as the corresponding analog loops in terms of signal-to-noise ratio and loop bandwidth, Furthermore, the sampling does not introduce biases or other significant effects on the loops provided that the loop bandwidth ts very small compared to the symbol rate, and that the number of samples per symbol is large compared to inverse loop bandwidth.
Details
- Volume
- 42-78
- Published
- August 15, 1984
- Pages
- 135–142
- File Size
- 481.1 KB