Journal ArticleDOI
Noise Performance and SNR Threshold in PFM
TLDR
In this correspondence, it is shown that in systems with signal-independent white noise, the SNR threshold is approximately 20 dB, and a more general expression describing noise performance of PFM, both above and below theSNR threshold, is derived.Abstract:
Pulse frequency modulation (PFM) has been considered by several authors for transmitting wide-band signals. However, the noise performance of PFM has been analyzed only above the SNR threshold. In this correspondence the results on the noise performance of PFM available in the literature are summarized, and a more general expression describing noise performance of PFM, both above and below the SNR threshold, is derived. This expression can be used to evaluate the SNR threshold for channels with both signal-independent noise (e.g., metallic facilities) and signal-dependent noise (e.g., fiber optic facilities). In particular, it is shown that in systems with signal-independent white noise, the SNR threshold is approximately 20 dB.read more
Citations
More filters
Journal ArticleDOI
Pulse time modulation techniques for optical communications: a review
Brett Wilson,Zabih Ghassemlooy +1 more
TL;DR: In this article, the PTM family is reviewed, a classification system is proposed and their potential for use in high-speed fibre systems intended for the transmission of analogue data is examined.
Patent
Offset cancellation and slice adjust amplifier circuit
TL;DR: In this article, a method and apparatus to provide slice adjustment and offset cancellation in a high frequency limiting amplifier is described, where the slice adjustment is performed by a high-frequency limiting amplifier.
Journal ArticleDOI
Optical fibre transmission of a broadband subcarrier multiplexed signal using PTM techniques
TL;DR: In this article, the authors proposed to improve SCM system performance by converting the analogue SCM signal into a pulse time modulated signal for optical transmission, and they have improved the dynamic range and optical power budget considerably, compared to conventional systems.
Dissertation
Investigation of the pulse time modulation techniques for transmission of wideband signals
TL;DR: In this article, a simple receiver has been proposed, which is based on converting the PSM waveform into a PAM waveform by sampling the received PSM signal at the rise time interval.
References
More filters
Journal ArticleDOI
A Detailed Comparison of Four Approaches to the Calculation of the Sensitivity of Optical Fiber System Receivers
TL;DR: The "Exact" and Monte Carlo calculations are in complete agreement, which allows the Monte Carlo results to be used to calibrate other methods and the relatively simple Chernoff bound is in very good agreement.
Journal ArticleDOI
Utilization of optical-frequency carriers for low- and moderate-bandwidth channels
TL;DR: In this paper, the use of optical-frequency carrier systems for transmission over low-and moderate-bandwidth channels is explored, including analog intensity modulation, pulse position modulation, delta modulation, and pulse code modulation.
Journal ArticleDOI
SNR Fluctuation and Nonlinear Distortion in PFM Optical NTSC Video Transmission Systems
T. Kanada,K. Hakoda,E. Yoneda +2 more
TL;DR: The causes of SNR fluctuation and nonlinear distortion, uncovered during field trials of PFM optical video transmission systems, are investigated theoretically and experimentally and good picture quality is maintained over long distance transmission.
Proceedings ArticleDOI
Fiber Optic Video Transmission System Employing Pulse Frequency Modulation
TL;DR: In this article, a hardware implementation of Pulse Frequency Modulation (PFM) is presented, and its operating characteristics are discussed, in the context of fiber optic tether cables between undersea vehicles and their support platforms.
Journal ArticleDOI
Receiver Design for Optical PPM Systems
T. Muoi,J. Hullett +1 more
TL;DR: An optimum receiver structure for optical PPM systemics is considered and from this a simple sub-optimum receiver is proposed which offers significant SNR improvement relative to existing design approaches and yet requires few circuit changes.