Analysis of Four Decision-Feedback Carrier Recovery Loops in the Presence of Intersymbol Interference
The performance of four decision-feedback carrier recovery techniques is evaluated in the presence of additive noise and intersymbol interference (ISI). For QAM signal constellations, a closed-form expression is given for the phase jitter variance (PJV) of each loop, and the loop tracking performanc...
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Veröffentlicht in: | I.R.E. transactions on communications systems 1985-06, Vol.33 (6), p.543-550 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The performance of four decision-feedback carrier recovery techniques is evaluated in the presence of additive noise and intersymbol interference (ISI). For QAM signal constellations, a closed-form expression is given for the phase jitter variance (PJV) of each loop, and the loop tracking performance is examined. The analytic results are then computed in the case of a 16 QAM digital radio system subjected to multipath fading. Two cases are considered: in the first case no countermeasure techniques are used against selective fading, while in the second case a three-coefficient decision-feedback equalizer (DFE) is used. Computer simulations using a pseudorandom sequence to estimate loop performance are also reported which support the theoretical results. |
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ISSN: | 0090-6778 0096-2244 1558-0857 |
DOI: | 10.1109/TCOM.1985.1096331 |