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Titolo:
DECISION-DIRECTED PLL FOR COHERENT OPTICAL PULSE CDMA SYSTEMS IN THE PRESENCE OF MULTIUSER INTERFERENCE, LASER PHASE NOISE, AND SHOT-NOISE
Autore:
HUANG W; ANDONOVIC I; TUR M;
Indirizzi:
UNIV STRATHCLYDE,DEPT ELECT & ELECT ENGN GLASGOW G1 1XW LANARK SCOTLAND TEL AVIV UNIV,FAC ENGN IL-69978 TEL AVIV ISRAEL
Titolo Testata:
Journal of lightwave technology
fascicolo: 10, volume: 16, anno: 1998,
pagine: 1786 - 1794
SICI:
0733-8724(1998)16:10<1786:DPFCOP>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
LINEWIDTH REQUIREMENTS; PERFORMANCE ANALYSIS; HOMODYNE RECEIVERS; COMMUNICATION; AMPLIFIERS; SEQUENCES;
Keywords:
CARRIER PHASE SYNCHRONIZATION; COHERENT OPTICAL PULSE CDMA; LASER LINEWIDTH; LASER PHASE NOISE; MULTIUSER INTERFERENCE; PHASE-LOCKED LOOPS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
24
Recensione:
Indirizzi per estratti:
Citazione:
W. Huang et al., "DECISION-DIRECTED PLL FOR COHERENT OPTICAL PULSE CDMA SYSTEMS IN THE PRESENCE OF MULTIUSER INTERFERENCE, LASER PHASE NOISE, AND SHOT-NOISE", Journal of lightwave technology, 16(10), 1998, pp. 1786-1794

Abstract

A digital decision-directed phase-locked loop (PLL) for use in optical pulse code-division multiple-access (CDMA) systems based on coherentcorrelation demodulation is proposed. PLL performance is affected by multiuser interference, laser phase noise and optical shot noise. The effect of these sources of interference and noise on PLL performance is evaluated based on a nonlinear model (the Fokker-Planck method) since a linear analysis yields large deviations between the analytical results and actual performance at low signal-to-noise ratios (SNR's), After describing the implementation of the PLL, the steady-state probability density function (pdf) of the phase estimator is derived, Numerical evaluation of the variance of the phase estimator is given for Gold codes. The linewidth requirements of the laser for an acceptable phaseestimator variance and the value of the optimal loop bandwidth minimizing the impact of the interference and noise on the PLL are discussed.

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Documento generato il 27/11/20 alle ore 21:26:21