An example of a hybrid system: coherent optical system with Costas loop in receiver-system for transmission in baseband

Djordjević, Ivan B.; Stefanovic, M.; Ilić, S; Djordjević, Goran T.

doi:10.1109/50.661007

Cited by 10 publications

(3 citation statements)

References 6 publications

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“…The Costas loop is a classical phase-locked loop (PLL) based circuit for carrier recovery (Best, 2007;Costas, 1956;Djordjevic et al, 1998;Waters, 1982). Nowadays various modifications of Costas loop circuit are used in many communication devices, e.g.…”

Section: Introductionmentioning

confidence: 99%

Phase-frequency Domain Model of Costas Loop with Mixer Discriminator

Kuznetsov

Леонов

Neittaanmäki

et al. 2013

Proceedings of the 10th International Conference on Informatics in Control, Automation and Robotics

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Problem of rigorous mathematical analysis of classical Costas Loop for non-sinusoidal signals is considered. The analytical method for phase detector characteristics computation is proposed and new classes of phase detector characteristics are computed for the first time. Effective methods for nonlinear analysis of Costas Loop are discussed. 1 see, e.g. counterexamples to filter hypothesis and to Aizerman's and Kalman's conjectures on absolute stabil

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Section: Introductionmentioning

confidence: 99%

Phase-frequency Domain Model of Costas Loop with Mixer Discriminator

Kuznetsov

Леонов

Neittaanmäki

et al. 2013

Proceedings of the 10th International Conference on Informatics in Control, Automation and Robotics

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“…If the best performance is desired a PSK receiver must incorporate the phase-locked loop (PLL). Three types of the PLL are currently employed -the balanced PLL, the Costas loop and the decision-driven loop (DDL) [1][2][3][4][5]. The balanced receivers are simpler in implementation but they impose more stringent laser linewidth requirements than those of the DDL-type or the Costas-type receivers [6] and therefore, the balanced receivers cannot easily be implemented.…”

Section: Introductionmentioning

confidence: 99%

Performance Optimization and exact Laser Linewidth Requirements Evaluation for Optical PSK Homodyne Communication Systems with Costas Loop or DDL

Djordjević¹,

Stefanović²,

Djordjević³

1999

Journal of Optical Communications

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For an optical homodyne receiver comprising a Costas loop a formula for the phase error variance determining is derived more precisely than even before. The requirement laser linewidth to achieve the bit-error rate 10~1 0 is obtained for the optimally chosen power splitting ratio. Two type of optical PSK homodyne communication systems are taken into consideration: the Costastype receivers and the DDL ones. It is shown that the requirement laser linewidth are less stringent when power splitting ratio is optimally chosen than that for the fixed power splitting ratio obtained starting from the permissible power penalty due to the power splitting.

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“…= α −1 + β −1 + (αβ) −1 . The knowledge of channel coefficient I k is feasible at the receiver side by channel estimation [7] because of the slow time-varying property of atmospheric turbulence, with correlation time from the order of 10 −3 seconds to 10 −2 seconds [8] . Moreover, the channel coefficient remains constant over a number of signal intervals [9] .…”

mentioning

confidence: 99%

Photon-counting chip-interleaved iterative PIC detector over atmospheric turbulence channels

Zhou¹,

Yang²,

Shao³

et al. 2012

中国光学快报

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A photon-counting-based iterative parallel interference cancellation (PIC) scheme for free-space optical communications in the presence of multiple-access interference, shot noise, background radiation, and turbulence fading is designed. An efficient chip-level iterative equivalent noise estimation algorithm is also derived. Simulation results show that the proposed scheme can achieve a single-user performance, bound with the fast convergence property. More importantly, it can eliminate the bit-error rate floor of the conventional optical code-division multiple-access system with the aid of a relatively short spreading code length.OCIS Free-space optical (FSO) systems have received considerable attention due to their substantial bandwidth, low power consumption, and high security property [1,2] . The multiple-access interference (MAI) is the primary limitation that will strongly degrade system performance in the multi-user FSO communications [3] . The optical code-division multiple-access (OCDMA) has been developed as a promising candidate for highrate communications. OCDMA allows multiple users to share the same media simultaneously. The nonzero cross correlation for conventional non-coherent OCDMA systems can cause serious MAI [4] . Long optical orthogonal code (OOC) sequences are required to serve several users simultaneously, resulting in low bandwidth efficiency. Moreover, the complexity of multi-user detection (MUD) is always a serious concern.A photon-counting-based iterative parallel interference cancellation (Iter-PIC) for the FSO multi-user communications is designed based on the aforementioned scenarios. Each user can be separated by the user-specific interleaver, which avoids the complex design of OOC in OCDMA systems. A log-likelihood ratio (LLR) MAI Iter-PIC algorithm is derived at the receiver, which considers the shot noise, background radiation, and thermal noise. The bit-error rate (BER) performance is evaluated over Gamma-Gamma turbulence-induced fading channels.The Iter-PIC FSO system structure is shown in Fig.

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An example of a hybrid system: coherent optical system with Costas loop in receiver-system for transmission in baseband

Cited by 10 publications

References 6 publications

Phase-frequency Domain Model of Costas Loop with Mixer Discriminator

Phase-frequency Domain Model of Costas Loop with Mixer Discriminator

Performance Optimization and exact Laser Linewidth Requirements Evaluation for Optical PSK Homodyne Communication Systems with Costas Loop or DDL

Photon-counting chip-interleaved iterative PIC detector over atmospheric turbulence channels

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