Citation
Abstract
This article presents a generic theory for the behavior and performance of hybrid carrier synchronization loops, i.e., loops composed of a combination of discrete and suppressed carrier types, and evaluates their impact on the error probability performance of a phase-shift-keyed (PSK) communication system. Since hybrid loops are characterized by two not necessarily equiprobable lock points (one at zero phase error and one at 180-deg phase error), it is necessary to properly take this phenomenon into account in predicting hybrid loop performance. As such, a new form of solution for the phase error probability density is proposed based on the solution of the Zakai equation. Using this mathematical model, the meansquared phase error of the hybrid loop is derived and numerically compared with results obtained from a computer simulation. Two methods of resolving the inherent 180-deg phase ambiguity associated with using a hybrid loop for carrier synchronization are discussed, and the corresponding average error probability performances of an associated PSK system are evaluated.
Details
- Volume
- 42-125
- Published
- May 15, 1996
- Pages
- 1–21
- File Size
- 565.0 KB