Quantized Feedback in an Experimental 280-Mb/s Digital Repeater for Coaxial Transmission

Waldhauer, F.D.

doi:10.1109/tcom.1974.1092055

Cited by 38 publications

(2 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In the presence of long data sequences with consecutive identical digits (CID), BLW degrades the performance of baseband communication systems. Several techniques such as line codes (e.g., see [1] and references therein) and quantized feedback (QFB) [2]- [5] have been proposed to mitigate BLW effects. Line codes reshape the transmit spectrum introducing a spectral null at DC in the signal, matching the one existing in the channel, while QFB uses the detected symbols to estimate and subtract the BLW component from the received signal.…”

Section: Introductionmentioning

confidence: 99%

Design and parallel implementation of an adaptive baseline wander compensator for high-speed optical coherent receivers

Maggio

Hueda

2011

2011 IEEE International Symposium of Circuits and Systems (ISCAS)

View full text Add to dashboard Cite

Baseline wander (BLW) is caused by transmission zeros at DC in the frequency response of the communication channel [1]. One of its common sources is a high-pass filter used to AC-couple the received signal. Numerous BLW compensation (BLWC) schemes for baseband and homodyne communication systems have been proposed in past literature. However, a preferred architecture in modern coherent optical communications is the intradyne receiver, because it avoids complex optical phase locked loops. As a result of the carrier frequency offset experienced at the input of intradyne coherent receivers, existing BLWC techniques are not sufficient.In this work we propose an adaptive parallel-processing BLW compensation architecture for high-speed coherent intradyne fiber optic receivers. Parallel processing for the BLWC implementation is imposed by the high data rate required in current optical applications. The new compensator estimates the BLW interference based on both the detected symbols and the carrier frequency offset provided by the carrier recovery loop. Numerical results demonstrate the effectiveness of the proposed technique to mitigate BLW effects.

show abstract

Section: Introductionmentioning

confidence: 99%

Design and parallel implementation of an adaptive baseline wander compensator for high-speed optical coherent receivers

Maggio

Hueda

2011

2011 IEEE International Symposium of Circuits and Systems (ISCAS)

View full text Add to dashboard Cite

show abstract

“…Dies führt zu Verzerrungen, die durch eine zusätzliche nichtlineare Entzerrerschaltung, die quantisierte Rückkopplung, im Regenerator kompensiert werden müssen [2]. So muß man, im Vergleich zur heute üblichen ternären Signalübertragung, einen geringfügig höheren schaltungstechnischen Aufwand im Regenerator akzeptieren, um ein Quaternärsignal zu regenerieren.…”

Section: Introductionunclassified

Quaternärsignal-Regeneratoren für hohe Felddämpfungsmaße

Röder¹,

Fahrendholz²

1987

Frequenz

View full text Add to dashboard Cite

R öder (VDE/ITG) und Joachim Fahrendholz Mitteihmg aus dem FORSCHUNGSINSTITUT der DEUTSCHEN BUNDESPOST, DARMSTADT Übersicht: Mit steigender Signalfrequenz steigt auch rapide das Dämpfungsmaß von metallenen Leiterpaaren in Fcrnmeldckabeln an. Um die Signalfrequenzen der Leitungssignale zu reduzieren, kann eine mehrstufige Signalübertragung mit reduzierter Schrittgeschwindigkeit angewendet werden. Als Ergebnis für einen annehmbaren Kompromiß zwischen Rauschreduktion, realisierungsbedingter Augendegradation, Tolcranzcmpfindlichkeit und Aufwand erscheint die vierstufige Signalübertragung sinnvoll. Hierfür wurden Quaternärsignal-Regeneratoren mit quantisicrtcr Rückkopplung an der unteren Bandgrcnze optimiert und in Feldversuchen bei hohen Felddämpfungsrnaßen erprobt. Die Ergebnisse aus den theoretischen Untersuchungen und Feldversuchen zeigen die Grenzen und beachtenswerten Möglichkeiten von Quaternärsignal-Regeneratoren in Fernmcldcnctzcn.Abstract: With rising frequency the attenuation ratio of metallic conductor pairs in telecommunication cables increases rapidly. To reduce the line signal frequency, multi-stage signal transmission with low field attenuation ratios can be used. An acceptable compromise between noise reduction, implementationdependent eye degradation, tolerance sensitivity and design complexity can be reduced by four-stage signal transmission. To this end, quaternary signal regenerators with quantized feedback were optimized at the lower band limit and tested in field trials at high modulation rates. The results obtained from theoretical investigations and field tests show the limits and noteworthy capabilities of quaternary signal regenerators applied in telecommunication networks. Für die Dokumentation: Digitalübertragung / Quaternärsignalübertragung / Regenerator Quatemärsignal-Regeneratoren für hohe Felddämpfungsmaße FREQUENZ 41 (19S7) 11/12 Quaternärsignal-Regeneratoren ßir hohe Felddämpfungsmaße FREQUENZ 41 (19S7) 11/12

show abstract

Probability distribution of digital sum variation for bimode pulse transmission code

Kasai

Fujii

1982

Electron. Comm. Jpn. Pt. I

View full text Add to dashboard Cite

A variety of coding types are proposed to improve the information transmission efficiency for a digital relay and transmission system. Quantitative estimation is required to clarify coding effectiveness with respect to the frequency region of timing waveform sampling characteristics and the time region of intercode interference based on low‐frequency cutoff. Formerly, various calculations were proposed to use the power spectrum for the former purpose and no consideration was given to the latter. This paper explains how to calculate the probability distribution of digital sum variations to estimate pulse transmission code performance in the time region. Since there are instances where the digital sum variations do not reach a desired state as a result of dc component suppression, the transition probability matrix cannot be determined. The transition probability matrix is then determined by introduction of a new parameter called the state vector, whereby the probability distribution can be calculated. Distribution probabilities for the 4B‐3T code digital sum variation are calculated as a practical application of calculation methods. Error rate performances considering these distributions are shown. These calculation methods may permit the estimation of pulse transmission code performance in conjunction with the power spectrum formerly used for the estimation of transmission code performance.

show abstract

Quantized Feedback in an Experimental 280-Mb/s Digital Repeater for Coaxial Transmission

Cited by 38 publications

References 8 publications

Design and parallel implementation of an adaptive baseline wander compensator for high-speed optical coherent receivers

Design and parallel implementation of an adaptive baseline wander compensator for high-speed optical coherent receivers

Quaternärsignal-Regeneratoren für hohe Felddämpfungsmaße

Probability distribution of digital sum variation for bimode pulse transmission code

Contact Info

Product

Resources

About