Carrier recovery for high speed coherent optical communication systems based on digital signal processing
Carrier recovery for high speed coherent optical communication systems based on digital signal processing
... requires high speed data communication within data-centers and high performance computers [3] The optical communication systems can be divided into two categories based on their detection method One ... that employ optical fibers for information transmission The carrier frequencies for optical communication systems are in the range of 100 THz which is the visible or near-infrared region of the ... followed by the motivation and outline of this thesis 1.1 Review of Coherent Optical Communication The coherent optical communication systems draw considerable attention and were intensively...
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Study on advanced modulation formats in coherent optical communication systems
... different advanced modulation formats in systems which include not only AWGN noise but also linear phase noises –3– Study on Advanced Modulation Formats in Coherent Optical Communication Systems ... –20– Study on Advanced Modulation Formats in Coherent Optical Communication Systems Chapter Performance Analysis of 4-Point Modulation Formats In Section 1.2, we reviewed the coherent detection systems ... (linewidth per laser 100 kHz ) –17– Study on Advanced Modulation Formats in Coherent Optical Communication Systems 1.3 Objectives and Contribution of the Study Recently, advanced modulation...
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Báo cáo hóa học: " Research Article V-Band Multiport Heterodyne Receiver for High-Speed Communication Systems" ppt
... heterodyne receiver, the carrier frequency ω is close to the local oscillator frequency ω0 50 Ω LO Figure 3: Layout of the V-band multiport circuit Therefore, these receivers are low IF heterodyne receivers ... proposed multiport approach This conventional receiver can be implemented using a V-band downconverter mixer (a balun and two Schottky diodes, e.g.) and a IF I/Q mixer In practice, for a multiport heterodyne ... important advantage of the proposed receiver compared to the conventional V-band down-conversion receiver The same multiport front-end can be used for both heterodyne and homodyne architectures...
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Optical performance monitoring in high speed optical communication systems
... OBPF Optical Band-pass Filter ODI Optical Delay Interferometer OEO Optical- Electrical -Optical OOK On-Off Keying OPM Optical Performance Monitoring OSNR Optical Signal-to-Noise Ratio OTF Optical ... OSNR monitoring and CD monitoring techniques In addition, time alignment of optical transmitter is also investigated Optical Signal to Noise Ratio Monitoring Among the proposed OSNR monitoring ... candidate for multiple optical impairments monitoring, which would be a monitoring solution in switching center or receiver end This method was studied in OSNR monitoring and CD monitoring with the co-operation...
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Tài liệu Báo cáo khoa học: "A HARDWARE ALGORITHM FOR HIGH SPEED MORPHEME EXTRACTION AND ITS IMPLEMENTATION" pptx
... section, can realize this strategy 3.1 A HARDWARE ALGORITHM FOR MORPHEME EXTRACTION FUNDAMENTAL ARCHITECTURE A new hardware algorithm for the morpheme extraction, which was designed with the strategy ... Search Method (Knuth,197S) CONCLUSION This paper proposes a new hardware algorithm for high speed morpheme extraction, and also describes its implementation on a specific machine This machine, MEX.I, ... character has M candidates, the worst case time complexity for sequential morpheme extraction algorithms is O(MN) On the other hand, the above proposed algorithm (Fukushima's algorithm) has the...
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Báo cáo khoa học: "Randomized Algorithms and NLP: Using Locality Sensitive Hash Function for High Speed Noun Clustering" pdf
... Sensitive Hash Function; Performance of fast Hamming distance search algorithm; Quality of final similarity lists 5.1 Evaluation of Locality sensitive Hash function To perform this evaluation, we randomly ... calculated using the traditional formula as given in equation For this base comparison system we use the one built by Pantel and Lin (2002) We perform kinds of evaluation: Performance of Locality Sensitive ... vectors and randomly permute them (see Appendix A for more details on random permutation functions) A random permutation can be considered as random jumbling of the bits of each vector2 A random...
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Báo cáo hóa học: " Research Article Pulse Interval Modulation for Ultra-High Speed IR-UWB Communications Systems" pdf
... “Digital pulse interval modulation for optical communications, ” IEEE Communications Magazine, vol 36, no 12, pp 95–99, 1998 [13] T Svedek and S Rupcic, “Anisochronous modulation methods for optical ... and R Kohno, “Combined pulse shape and pulse position modulation for high data rate transmissions in ultra-wideband communications, ” International Journal of Wireless Information Networks, vol ... “Orthonormal pulses for high data rate communications in indoor UWB systems,” IEEE Communications Letters, vol 9, no 5, pp 405– 407, 2005 [4] J A N da Silva and M L R de Campos, “Method for obtaining...
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Báo cáo hóa học: "Research Article Design of an Omnidirectional Multibeam Transmitter for High-Speed Indoor Wireless Communications" doc
... (16) For example, an SNR of 36 (15.6 dB) is required to achieve a BER of 10−9 2.5 Channel Bandwidth The bandwidth of the indoor channel is computed from the Fourier transform of the channel ... a uniform and full coverage of power distributions and this can be achieved by modifying some key parameters of the multibeam transmitter, such as the number of transmitters, elevation and azimuth ... modeling for wireless infrared channels,” IEEE Transactions on Antennas and Propagation, vol 50, no 5, pp 759–765, 2002 J.-L Tang, P C Jui, and S C Wang, “Simulation and design of omni-directional high-speed...
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Báo cáo hóa học: " Research Article VLSI Implementation of a Fixed-Complexity Soft-Output MIMO Detector for High-Speed Wireless" pptx
... coding to maintain a near-MAP performance in frame error ratio [5] In this paper, its performance with the aid of H-ARQ is investigated In order to validate MFCSO from VLSI implementation perspectives, ... paper MultiAntenna in LTE and WiMAX Wireless standards such as 3GPP LTE and WiMAX have incorporated MIMO transmission schemes to boost the peak data rate Meanwhile, software-defined radio (SDR) ... Access (OFDMA) as the multiple access scheme in downlink MIMO technologies are also mandatory in LTE to achieve the LTE bit-rate targets (e.g 100 Mbit/s peak data rate for downlink) As part of...
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Báo cáo hóa học: " Submonolayer Quantum Dots for High Speed Surface Emitting Lasers" potx
... interconnects at speeds higher 10 Gb/s Fiber optic links based on vertical-cavity surface- emitting lasers (VCSELs) are broadly believed to be the best candidates [2–4] for these applications in the foreseeable ... significant increase of the modulation speed of VCSELs combined with the demands for power, degradation robustness and speed of next generation ultrahigh speed systems require new material and ... values of this surface stress are different for the two phases co-existing on the crystal surface (heteroepitaxial deposits, domains of surface reconstruction, adsorbate phases, etc.), formation of...
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Báo cáo hóa học: " Research Article Towards Scalable MAC Design for High-Speed Wireless LANs" ppt
... MAC designs should control contentions and collisions over the shared wireless channel and deliver stable performance Protocol overhead scalability The third aspect in scalable wireless MAC design ... modeling the DCF MAC The result cannot be readily applied to high-speed wireless networks The MAC design in high-speed wireless networks, such as IEEE 802.11n, 12 EURASIP Journal on Wireless Communications ... transmits at rate ri When TMAC adopts the adaptive batch transmission at the Yuan Yuan et al Table 2: Comparison of TMAC, DCF, and OAR DCF MAC OAR MAC TMACR f =108 TMACR f =54 TMACR f =24 S (Mb/s) 18.41...
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Digital signal processing for front end non idealities in coherent optical OFDM system
... development of digital signal processing algorithms for front- end non- idealities in CO -OFDM system The goal is to design efficient and effective algorithms for combatting carrier frequency offset, linear ... metric in the presence of linear phase noise deserves great attention In this thesis, we will focus on combatting the front- end non- idealiteis in CO -OFDM system Digital signal processing algorithms ... by employing frequency domain equalization similar to OFDM systems Thus, OFDM offers easier digital signal processing compared to single carrier for most cases in high speed coherent optical long-haul...
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Development of high mobility channel layer formation technology for high speed CMOS devices
... DEVELOPMENT OF HIGH MOBILITY CHANNEL LAYER FORMATION TECHNOLOGY FOR HIGH SPEED CMOS DEVICES OH Hoon Jung (B Sc., Ewha Womans University, Korea) ... the use of new gate stack materials Thus this work of development of high mobility channel layer formation technology has been carried out for the innovative change The subsequent sections in ... properties of III-V materials render them suitable as a potential candidate for high- speed NMOSFETs beyond strained-Si devices In fact, the higher channel mobility with an enhancement factor of more...
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Design and characterization of interposers for high speed fine pitch wafer level packaged device testing
... application of fine- pitch, high- speed wafer- level packaged device testing have been proposed and studied An interposer is needed for the wafer level test because the fine pitch, high pin count, high ... is required for the electrical high speed testing of fine pitch wafer level packaged devices It provides a solution to the required fine pitch, high density I/Os, high pin count and vertical ... objectives of this research work are to design and characterize feasible interposers meeting the requirements for the application of specific high speed test of the fine pitch wafer level packaged devices...
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Wireless Optical Communication Systems Springer Verlag Telos
... Brief History of Wireless Optical Communications Figure 1.1 An indoor wireless optical communication system Figure 1.1 presents a diagram of a typical indoor wireless optical communications scenario ... Wireless Optical Communication Systems This page intentionally left blank WIRELESS OPTICAL COMMUNICATION SYSTEMS STEVE HRANILOVIC Assistant Professor ... Introduction INTRODUCTION 1.1 A Brief History of Wireless Optical Communications 1.2 Overview WIRELESS OPTICAL INTENSITY CHANNELS 2.1 Wireless Optical Intensity Channels 2.2 Optoelectronic Components...
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