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Academic literature on the topic 'Time Division Multiplexing Access'

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Published: 14 March 2023

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Journal articles on the topic "Time Division Multiplexing Access"

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Ansari, Muhammad Adil, Umair Saeed Solnagi, Jinuk Kim, Ahsin Murtaza Bughio, and Sungju Park. "Time Division Multiplexing based Test Access for Stacked ICs." JOURNAL OF SEMICONDUCTOR TECHNOLOGY AND SCIENCE 19, no. 1 (February 28, 2019): 87–96. http://dx.doi.org/10.5573/jsts.2019.19.1.087.

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Li, Jun, Miaowen Wen, Xueqin Jiang, and Wei Duan. "Space-Time Multiple-Mode Orthogonal Frequency Division Multiplexing With Index Modulation." IEEE Access 5 (2017): 23212–22. http://dx.doi.org/10.1109/access.2017.2761845.

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Liu, Bo, Lijia Zhang, Xiangjun Xin, and Lei Liu. "40 Gb/s dynamic wavelength-division-multiplexing/time-division-multiplexing hybrid access network with energy and data stream synchronized transmission." Optics Letters 38, no. 18 (September 4, 2013): 3503. http://dx.doi.org/10.1364/ol.38.003503.

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Siddiqi, Umair F., Sadiq M. Sait, and Murat Uysal. "Deep Q-Learning Based Optimization of VLC Systems With Dynamic Time-Division Multiplexing." IEEE Access 8 (2020): 120375–87. http://dx.doi.org/10.1109/access.2020.3005885.

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Wang, Hui Qi, and Wangyong Lv. "FrFT Angle Division Multiple Access with Optimal Time-Frequency-Angle Resource Distribution." Applied Mechanics and Materials 519-520 (February 2014): 1012–15. http://dx.doi.org/10.4028/www.scientific.net/amm.519-520.1012.

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In this paper, optimal time-frequency-angle (TFA) resource distribution is proposed. It is achieved by fractional Fourier transform (FrFT) angle division multiple access (ADMA), and multiple data streams can be transmitted in the same frequency and time slot. Comparing with conventional time-frequency (TF) resource based orthogonal frequency division multiplexing (OFDM) system, the exponential base at each sub-channel is replaced by a set of chirp bases, which keep mutually approximately orthogonal. Each base station (BS) can support more move stations (MSs) or cell throughput. Simulations show the essential advantages in TFA resource distribution and system spectrum efficiency.
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Yonis, Aws Zuheer, and Khalid Khalil Mohammed. "Investigation of pattern division multiple access technique in wireless communication networks." Indonesian Journal of Electrical Engineering and Computer Science 26, no. 1 (April 1, 2022): 296. http://dx.doi.org/10.11591/ijeecs.v26.i1.pp296-303.

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Recently, <span>pattern division multiple access (PDMA) is a non-orthogonal multiple access system that is now being developed in next-generation telecoms to address the requirement for mass connectivity. The core premise of non-orthogonal multiple access is to simultaneously serve multiple users with varying power levels across the same spectrum resources such as time, frequency, code, as well as space with minimal inter-user interference. A simulation analysis of significant technology enhancements focusing on PDMA aims to describe the benefits of the two plans now being examined by the third-generation partnership project for 5G technologies, namely filtered orthogonal frequency division multiplexing (F-OFDM) and windowed orthogonal frequency division multiplexing (W-OFDM), and to compare them to alternative modulation processes such as 16, 32, and 128 modulations. The research results explained the PDMA is less bit error rate used in multiple access technologies compare with W-OFDM and F-OFDM.</span>
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Saeed, Iftikhar Ahmed, Shi Qinglan, Minjuan Wang, Salman Latif Butt, Lihua Zheng, Vu Ngoc Tuan, and Gao Wanlin. "Development of a Low-Cost Multi-Depth Real-Time Soil Moisture Sensor Using Time Division Multiplexing Approach." IEEE Access 7 (2019): 19688–97. http://dx.doi.org/10.1109/access.2019.2893680.

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Richard, E. Alwin. "Performance Analysis of OFDMA vs. NOMA in Cognitive Radio Network." International Journal for Research in Applied Science and Engineering Technology 9, no. VI (June 14, 2021): 2483–88. http://dx.doi.org/10.22214/ijraset.2021.34751.

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Recent advancements in communication systems have resulted in a new class of multiple access schemes known as non-orthogonal multiple access (NOMA), the primary goal of which is to increase spectrum efficiency by overlapping data from different users in a single time-frequency resource used by the physical layer. NOMA receivers can resolve interference between data symbols from various users, hence increasing throughput. Initially, the combination of SCMA and orthogonal frequency division multiplexing (OFDM) is addressed, establishing a baseline for the overall SER performance of the multiple access strategy. Furthermore, this work suggests the merging of SCMA with generalised frequency division multiplexing (GFDM).GFDM is an intriguing possibility for future wireless communication systems since it is a very flexible non-orthogonal waveform that can imitate various different waveforms as corner cases. This research suggests two methods for integrating SCMA with GFDM.
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Wu, Bin, Hongxi Yin, Jie Qin, Chang Liu, Anliang Liu, Qi Shao, and Xiaoguang Xu. "Design and implementation of flexible TWDM-PON with PtP WDM overlay based on WSS for next-generation optical access networks." Modern Physics Letters B 30, no. 25 (September 20, 2016): 1650324. http://dx.doi.org/10.1142/s0217984916503243.

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Aiming at the increasing demand of the diversification services and flexible bandwidth allocation of the future access networks, a flexible passive optical network (PON) scheme combining time and wavelength division multiplexing (TWDM) with point-to-point wavelength division multiplexing (PtP WDM) overlay is proposed for the next-generation optical access networks in this paper. A novel software-defined optical distribution network (ODN) structure is designed based on wavelength selective switches (WSS), which can implement wavelength and bandwidth dynamical allocations and suits for the bursty traffic. The experimental results reveal that the TWDM-PON can provide 40 Gb/s downstream and 10 Gb/s upstream data transmission, while the PtP WDM-PON can support 10 GHz point-to-point dedicated bandwidth as the overlay complement system. The wavelengths of the TWDM-PON and PtP WDM-PON are allocated dynamically based on WSS, which verifies the feasibility of the proposed structure.
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Liang, Siyuan. "The demonstration of 10 Gbit/s time division multiplexing and 2.5 Gchip/s quasi-synchronous electrical code division multiplexing access passive optical network prototype system." Optical Engineering 51, no. 4 (April 20, 2012): 040507. http://dx.doi.org/10.1117/1.oe.51.4.040507.

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Dissertations / Theses on the topic "Time Division Multiplexing Access"

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Cen, Min. "Study on Supervision of Wavelength Division Multiplexing Passive Optical Network systems." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-42362.

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The wavelength-division-multiplexed passive optical network (WDM-PON) offers many advantages such as large bandwidth per user, easy management, high network security and low insertion loss enabling long-reach and/or high split-ratio. However, with the rapid development and growing interest for deployment of WDM-PON, the PON systems are becoming increasingly vulnerable to various failures. Therefore, network supervision becomes extremely important to guarantee an appropriate level of network reliability performance. The aim of PON supervision is to provide automated test and diagnostic capability without compromising the available bandwidth for services. An essential function is to detect any kind of deterioration in the network that can cause suspended services and to remotely localize these faults in order to avoid the high cost arising from troubleshooting. In this thesis, we evaluate several existing WDM PON supervision methods, based on which two simple and cost-effective new solutions are proposed to localize fiber failures in WDM PON systems. In the first solution, a conventional optical time domain reflectometry (OTDR) and a switch unit are employed, while in the second method, a novel architecture based on N×N arrayed waveguide grating (AWG) is proposed. Both methods are able to localize failures in feeder fiber and drop fibers without e.g. using expensive tunable OTDRs. A patent has been filed based on the second solution. The first proposed method is validated by simulations using VPI Transmission Maker. According to the results, this supervision method is able to give accurate measurement of many different types of failures that may happen in a fiber link. Furthermore, VPI is examined in terms of its future applicability in modeling complete PON supervision methods based on OTDR.
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Mody, Apurva Narendra. "Signal Acquisition and Tracking for Fixed Wireless Access Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/7624.

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The general objective of this proposed research is to design and develop signal acquisition and tracking algorithms for multiple input multiple output orthogonal frequency division multiplexing (MIMO-OFDM) systems for fixed wireless access applications. The algorithms are specifically targeted for systems that work in time division multiple access and frequency division multiple access frame modes. In our research, we first develop a comprehensive system model for a MIMO-OFDM system under the influence of the radio frequency (RF) oscillator frequency offset, sampling frequency (SF) offset, RF oscillator phase noise, frequency selective channel impairments and finally the additive white Gaussian noise. We then develop the acquisition and tracking algorithms to estimate and track all these parameters. The acquisition and tracking algorithms are assisted by a preamble consisting of one or more training sequences and pilot symbol matrices. Along with the signal acquisition and tracking algorithms, we also consider design of the MIMO-OFDM preamble and pilot signals that enable the suggested algorithms to work efficiently. Signal acquisition as defined in our research consists of time and RF synchronization, SF offset estimation and correction, phase noise estimation and correction and finally channel estimation. Signal tracking consists of RF, SF, phase noise and channel tracking. Time synchronization, RF oscillator frequency offset, SF oscillator frequency offset, phase noise and channel estimation and tracking are all research topics by themselves. A large number of studies have addressed these issues, but usually individually and for single-input single-output (SISO) OFDM systems. In the proposed research we present a complete suite of signal acquisition and tracking algorithms for MIMO-OFDM systems along with Cramr-Rao bounds for the SISO-OFDM case. In addition, we also derive the Maximum Likelihood (ML) estimates of the parameters for the SISO-OFDM case. Our proposed research is unique from the existing literature in that it presents a complete receiver implementation for MIMO-OFDM systems and accounts for the cumulative effects of all possible acquisition and tracking errors on the bit error rate (BER) performance. The suggested algorithms and the pilot/training schemes may be applied to any MIMO OFDM system and are independent of the space-time coding techniques that are employed.
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Kong, Zhen, and 孔振. "Design and analysis of cooperative and non-cooperative resource management algorithms in high performance wireless systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B40687387.

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Kong, Zhen. "Design and analysis of cooperative and non-cooperative resource management algorithms in high performance wireless systems." Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/B40687387.

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Quintana, Joel. "Hybrid optical network using incoherent optical code division multiple access via optical delay lines." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2009. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

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Lowe, Darryn W. "Real-time FPGA realization of an UWB transceiver physical layer." Access electronically, 2005. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20060726.161825/index.html.

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Garro, Crevillén Eduardo. "Advanced Layered Divsion Multiplexing Technologies for Next-Gen Broadcast." Doctoral thesis, Universitat Politècnica de València, 2018. http://hdl.handle.net/10251/105559.

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Desde comienzos del siglo XXI, los sistemas de radiodifusión terrestre han sido culpados de un uso ineficiente del espectro asignado. Para aumentar la eficiencia espectral, los organismos de estandarización de TV digital comenzaron a desarrollar la evolución técnica de los sistemas de TDT de primera generación. Entre otros, uno de los objetivos principales de los sistemas de TDT de próxima generación (DVB-T2 y ATSC 3.0) es proporcionar simultáneamente servicios de TV a dispositivos móviles y fijos. El principal inconveniente de esta entrega simultánea son los diferentes requisitos de cada condición de recepción. Para abordar estas limitaciones, se han considerado diferentes técnicas de multiplexación. Mientras que DVB-T2 acomete la entrega simultánea de los dos servicios mediante TDM, ATSC 3.0 adoptó la Multiplexación por División en Capas (LDM). LDM puede superar a TDM y a FDM al aprovechar la relación de Protección de Error Desigual (UEP), ya que ambos servicios, llamados capas, utilizan todos los recursos de frecuencia y tiempo con diferentes niveles de potencia. En el lado del receptor, se distinguen dos implementaciones, de acuerdo con la capa a decodificar. Los receptores móviles solo están destinados a obtener la capa superior, conocida como Core Layer (CL). Para no aumentar su complejidad en comparación con los receptores de capa única, la capa inferior, conocida como Enhanced Layer (EL), es tratada como un ruido adicional en la decodificación. Los receptores fijos aumentan su complejidad, ya que deben realizar un proceso de Cancelación de Interferencia (SIC) sobre la CL para obtener la EL. Para limitar la complejidad adicional de los receptores fijos, las capas de LDM en ATSC 3.0 están configuradas con diferentes capacidades de corrección, pero comparten el resto de bloques de la capa física, incluido el TIL, el PP, el tamaño de FFT, y el GI. Esta disertación investiga tecnologías avanzadas para optimizar el rendimiento de LDM. Primero se propone una optimización del proceso de demapeo para las dos capas de LDM. El algoritmo propuesto logra un aumento de capacidad, al tener en cuenta la forma de la EL en el proceso de demapeo de la CL. Sin embargo, el número de distancias Euclidianas a computar puede aumentar significativamente, conduciendo no solo a receptores fijos más complejos, sino también a receptores móviles más complejos. A continuación, se determina la configuración de piloto ATSC 3.0 más adecuada para LDM. Teniendo en cuenta que las dos capas comparten el mismo PP, surge una contrapartida entre la densidad de pilotos (CL) y la redundancia sobre los datos (EL). A partir de los resultados de rendimiento, se recomienda el uso de un PP no muy denso, ya que ya han sido diseñados para hacer frente a ecos largos y altas velocidades. La amplitud piloto óptima depende del estimador de canal en los receptores (ej., se recomienda la amplitud mínima para una implementación Wiener, mientras que la máxima para una implementación FFT). También se investiga la potencial transmisión conjunta de LDM con tres tecnologías avanzadas adoptadas en ATSC 3.0: las tecnologías de agregación MultiRF, los esquemas de MISO distribuido y los de MIMO colocalizado. Se estudian los potenciales casos de uso, los aspectos de implementación del transmisor y el receptor, y las ganancias de rendimiento de las configuraciones conjuntas para las dos capas de LDM. Las restricciones adicionales de combinar LDM con las tecnologías avanzadas se consideran admisibles, ya que las mayores demandas ya están contempladas en ATSC 3.0 (ej., una segunda cadena de recepción). Se obtienen ganancias significativas en condiciones de recepción peatonal gracias a la diversidad en frecuencia proporcionada por las tecnologías MultiRF. La conjunción de LDM con esquemas de MISO proporciona ganancias de rendimiento significativas en redes SFN para la capa fija con el esquema de Alamouti.
Since the beginning of the 21st century, terrestrial broadcasting systems have been blamed of an inefficient use of the allocated spectrum. To increase the spectral efficiency, digital television Standards Developing Organizations settled to develop the technical evolution of the first-generation DTT systems. Among others, a primary goal of next-generation DTT systems (DVB-T2 and ATSC 3.0) is to simultaneously provide TV services to mobile and fixed devices. The major drawback of this simultaneous delivery is the different requirement of each reception condition. To address these constraints different multiplexing techniques have been considered. While DVB-T2 fulfilled the simultaneous delivery of the two services by TDM, ATSC 3.0 adopted the LDM technology. LDM can outperform TDM and FDM by taking advantage of the UEP ratio, as both services, namely layers, utilize all the frequency and time resources with different power levels. At receiver side, two implementations are distinguished, according to the intended layer. Mobile receivers are only intended to obtain the upper layer, known as CL. In order not to increase their complexity compared to single layer receivers, the lower layer, known as EL is treated as an additional noise on the CL decoding. Fixed receivers, increase their complexity, as they should performed a SIC process on the CL for getting the EL. To limit the additional complexity of fixed receivers, the LDM layers in ATSC 3.0 are configured with different error correction capabilities, but share the rest of physical layer parameters, including the TIL, the PP, the FFT size, and the GI. This dissertation investigates advanced technologies to optimize the LDM performance. A demapping optimization for the two LDM layers is first proposed. A capacity increase is achieved by the proposed algorithm, which takes into account the underlying layer shape in the demapping process. Nevertheless, the number of Euclidean distances to be computed can be significantly increased, contributing to not only more complex fixed receivers, but also more complex mobile receivers. Next, the most suitable ATSC 3.0 pilot configuration for LDM is determined. Considering the two layers share the same PP a trade-off between pilot density (CL) and data overhead (EL) arises. From the performance results, it is recommended the use of a not very dense PP, as they have been already designed to cope with long echoes and high speeds. The optimum pilot amplitude depends on the channel estimator at receivers (e.g. the minimum amplitude is recommended for a Wiener implementation, while the maximum for a FFT implementation). The potential combination of LDM with three advanced technologies that have been adopted in ATSC 3.0 is also investigated: MultiRF technologies, distributed MISO schemes, and co-located MIMO schemes. The potential use cases, the transmitter and receiver implementations, and the performance gains of the joint configurations are studied for the two LDM layers. The additional constraints of combining LDM with the advanced technologies is considered admissible, as the greatest demands (e.g. a second receiving chain) are already contemplated in ATSC 3.0. Significant gains are found for the mobile layer at pedestrian reception conditions thanks to the frequency diversity provided by MultiRF technologies. The conjunction of LDM with distributed MISO schemes provides significant performance gains on SFNs for the fixed layer with Alamouti scheme. Last, considering the complexity in the mobile receivers and the CL performance, the recommended joint configuration is MISO in the CL and MIMO in the EL.
Des de començaments del segle XXI, els sistemes de radiodifusió terrestre han sigut culpats d'un ús ineficient de l'espectre assignat. Per a augmentar l'eficiència espectral, els organismes d'estandardització de TV digital van començar a desenvolupar l'evolució tècnica dels sistemes de TDT de primera generació. Entre altres, un dels objectius principals dels sistemes de TDT de pròxima generació (DVB-T2 i el ATSC 3.0) és proporcionar simultàniament serveis de TV a dispositius mòbils i fixos. El principal inconvenient d'aquest lliurament simultani són els diferents requisits de cada condició de recepció. Per a abordar aquestes limitacions, s'han considerat diferents tècniques de multiplexació. Mentre que DVB-T2 escomet el lliurament simultani dels dos serveis mitjançant TDM, ATSC 3.0 va adoptar la Multiplexació per Divisió en Capes (LDM). LDM pot superar a TDM i a FDM en aprofitar la relació de Protecció d'Error Desigual (UEP), ja que tots dos serveis, cridats capes, utilitzen tots els recursos de freqüència i temps amb diferents nivells de potència. En el costat del receptor, es distingeixen dues implementacions, d'acord amb la capa a decodificar. Els receptors mòbils solament estan destinats a obtenir la capa superior, coneguda com Core Layer (CL). Per a no augmentar la seua complexitat en comparació amb els receptors de capa única, la capa inferior, coneguda com Enhanced Layer (EL), és tractada com un soroll addicional en la decodificació. Els receptors fixos augmenten la seua complexitat, ja que han de realitzar un procés de Cancel·lació d'Interferència (SIC) sobre la CL per a obtenir l'EL. Per a limitar la complexitat addicional dels receptors fixos, les capes de LDM en ATSC 3.0 estan configurades amb diferents capacitats de correcció, però comparteixen la resta de blocs de la capa física, inclòs el TIL, el PP, la grandària de FFT i el GI. Aquesta dissertació investiga tecnologies avançades per a optimitzar el rendiment de LDM. Primer es proposa una optimització del procés de demapeo per a les dues capes de LDM. L'algoritme proposat aconsegueix un augment de capacitat, en tenir en compte la forma de l'EL en el procés de demapeo de la CL. No obstant açò, el nombre de distàncies Euclidianes a computar pot augmentar significativament, conduint NO sols a receptors fixos més complexos, sinó també a receptors mòbils més complexos. A continuació, es determina la configuració de pilot ATSC 3.0 més adequada per a LDM. Tenint en compte que les dues capes comparteixen el mateix PP, es produeix una contrapartida entre la densitat de pilots (CL) i la redundància sobre les dades (EL). A partir dels resultats de rendiment, es recomana l'ús d'un PP no gaire dens, ja que ja han sigut dissenyats per a fer front a ecos llargs i altes velocitats. L'amplitud pilot òptima depèn de l'estimador de canal en els receptors (ex., es recomana l'amplitud mínima per a una implementació Wiener, mentre que la màxima per a una implementació FFT). També s'investiga la potencial transmissió conjunta de LDM amb tres tecnologies avançades adoptades en ATSC 3.0: les tecnologies d'agregació de MultiRF, els esquemes de MISO distribuït i els de MIMO colocalitzat. S'estudien els potencials casos d'ús, els principals aspectes d'implementació del transmissor i el receptor, i els guanys de rendiment de les configuracions conjuntes per a les dues capes de LDM. Les restriccions addicionals de combinar LDM amb les tecnologies avançades es consideren admissibles, ja que les majors demandes ja estan contemplades en ATSC 3.0 (ex., una segona cadena de recepció). S'obtenen guanys significatius per a la capa mòbil en condicions de recepció per als vianants gràcies a la diversitat en freqüència proporcionada per les tecnologies MultiRF. La conjunció de LDM amb esquemes MISO distribuïts proporciona guanys de rendiment significatius en xarxes SFN per a la capa fixa amb l'esquema d'Alamouti.
Garro Crevillén, E. (2018). Advanced Layered Divsion Multiplexing Technologies for Next-Gen Broadcast [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/105559
TESIS
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Prins, Christian. "Problemes d'optimisation de ressources dans les systemes de telecommunications par satellite utilisant l'amrt (acces multiple a repartition dans le temps)." Paris 6, 1988. http://www.theses.fr/1988PA066495.

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Le probleme pose par ces systemes de telecommunications par satellite est d'acheminer un trafic donne avec un minimum d'equipements. Dans cette these, les problemes d'optimisation correspondants sont repertories et modelises
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Omomukuyo, O. O. "Orthogonal frequency division multiplexing for optical access networks." Thesis, University College London (University of London), 2013. http://discovery.ucl.ac.uk/1400463/.

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Orthogonal Frequency Division Multiplexing (OFDM) is a modulation scheme with numerous advantages that has for years been employed as the leading physical interface in many wired and wireless communication systems. Recently, with advancements made in digital signal processing, there has been a surge of interest in applying OFDM techniques for optical communications. This thesis presents extensive research on optical OFDM and how it is being applied in access networks. With the aid of theoretical analysis, simulations and experiments, it is shown that the system performance of direct-detection optical OFDM (DD-OOFDM) in the presence of MZM non-linear distortion can be improved by proper biasing and selection of appropriate drive to the MZM. Investigations are conducted to illustrate how a variation in the number of subcarriers and the modulation format influences the sensitivity of the DD-OOFDM system to the MZM non-linear distortion. The possibility of improving the spectral efficiency by reduction of the width of the guard band is also investigated. This thesis also looks into the radio-over-fibre (RoF) transmission of Multiband OFDM UWB as a transparent and low-cost solution for distributing multi-Gbit/s data to end-users in FTTH networks. Due to relaxed regulatory requirements and the wide bandwidth available, UWB operation in the 60-GHz band is also considered for this FTTH application scenario. Four techniques for enabling MB-OFDM UWB RoF operation in the 60-GHz band are experimentally demonstrated. The impacts of various parameters on the performance of the techniques as well as the limitations imposed by fibre distribution are illustrated. Finally, a digital pre-distorter is proposed for compensating for the MZM non-linearity. Experimental demonstration of this digital pre-distortion in an UWB over fibre transmission system shows an increased tolerance to the amplitude of the driving OFDM signal as well as an increase in the optimum modulation index of the OFDM signal.
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OLIVIERI, BRUNO SAPHA. "INTERROGATION SYSTEM OF FIBER BRAGG GRATING SENSORS USING TIME DIVISION MULTIPLEXING AND WAVELENGTH DIVISION MULTIPLEXING." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2004. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=5905@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
Um sistema de interrogação de sensores a rede de Bragg utilizando multiplexação no tempo e multiplexação no comprimento de onda é proposto e demonstrado. O sistema apresenta uma solução para a medição de grandezas associadas ao espectro de reflexão de redes de Bragg, possibilitando o aumento do número de sensores a rede de Bragg monitorados através de grandes distâncias em uma mesma fibra óptica, sem um aumento significativo dos custos. O aspecto inovador deste sistema reside na particular associação das seguintes características: o uso de fonte pulsada de banda larga, a disposição, em série, de um grande número de sensores a rede de Bragg de baixa refletividade, a técnica de reutilização dos mesmos comprimentos de onda nominais em grupos contendo vários sensores com comprimentos de onda nominais distintos e um processo de filtragem espectral e análise de sinais pulsados utilizando o filtro DWDM comercial. Aspectos teóricos e experimentais considerando os princípios de trabalho desta técnica são discutidos. Comparações entre resultados simulados e experimentais do sistema implantado mostram boa concordância. Resultados experimentais apontam uma faixa dinâmica de 1,7 nm, podendo encontrar aplicações em medição de temperatura com uma faixa de 150°C. Incertezas com valores médios abaixo de 20 picometros foram obtidas. Simulações experimentais apontam a possibilidade de utilização de um número de aproximadamente 70 sensores com 0,4% de refletividade, por comprimento de onda. Considerando a largura de banda do dispositivo DWDM (1539- 1565 nm) utilizado neste sistema, e um espaçamento de 7 nm por comprimento de onda nominal de sensor, extrapolações mostram que este número pode chegar a 210 sensores em três diferentes comprimentos de onda nominais de sensor. Considerando as bandas C e L este número pode chegar a aproximadamente 1000 sensores em 14 diferentes comprimentos de onda nominais de sensor.
An interrogation system of fiber Bragg grating sensors using time division multiplexing and wavelength division multiplexing is proposed and demonstrated. The system presents a solution to measure the magnitudes associated to the reflection spectrum of the fiber Bragg gratings, making possible to increase the number of the Bragg gratings sensors monitored through large distances at the same fiber optic, without a great increase in the costs. The innovative aspect of this system is the particular association of the following characteristics: the use of a pulsed broad band source, the disposition, in series, of a large number of low reflectivity Bragg gratings sensors, the reusing technique of the same nominal wavelengths in groups containing several numbers of sensors with distinct nominal wavelengths, and a spectral analyzing and filtering process of pulsed signals using a commercial DWDM filter. Theoretical and experimental aspects regarding the working principles of this technique are discussed. Comparisons between experimental and simulated results show a good agreement. Experimental results indicate that a dynamic range of 1,7 nm was obtained. It can be used in temperature measurement systems, with a 150°C range. Uncertainties equivalent to approximately 20 picometers was obtained. Experimental simulations indicate that it would be possible to use a number of approximately 70 sensors with 0,4% reflectivity at each nominal sensor wavelength. Considering the DWDM filter bandwidth (1539-1565 nm) used in this system, and a spectral separation of 7 nm by nominal sensor wavelength, extrapolations indicate that a number of 210 sensors can be obtained, in three different nominal sensor wavelength. Using the C-band and the L-band, a number of 1000 sensors can be obtained, in fourteen different nominal sensor wavelength.
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Books on the topic "Time Division Multiplexing Access"

1

Giovanni, Cancellieri, and Chiaraluce Franco, eds. Wavelength division multiple access optical networks. Boston: Artech House, 1998.

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Jiang, Tao, Yan Zhang, and Lingyang Song. Orthogonal frequency division multiple access fundamentals and applications. Boca Raton: Auerbach, 2010.

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Jiang, Tao, 1970 Jan. 8-, Song Lingyang, and Zhang Yan 1977-, eds. Orthogonal frequency division multiple access fundamentals and applications. Boca Raton: Auerbach, 2010.

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OFDM towards fixed and mobile broadband wireless access. Boston, MA: Artech House, 2007.

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Cooper, David J. F. Time division multiplexing of a serial fibre optic Bragg grating sensor array. Ottawa: National Library of Canada, 1999.

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Omar, Hassan Aboubakr, and Weihua Zhuang. Time Division Multiple Access For Vehicular Communications. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09504-2.

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Optical packet access protocols for WDM networks. Boston: Kluwer Academic Publishers, 2002.

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1952-, Hanzo Lajos, ed. OFDM and MC-CDMA for broadband multi-user communications, WLANs, and broadcasting. [Piscataway, N.J.]: IEEE Press, 2003.

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Wanyi, Gu, Zhou Jianhui, Pan Jin-Yi, Credit Suisse First Boston. Technology Group., Australian Optical Society, Tong xun shi jie (China), Oputoronikususha, and Society of Photo-optical Instrumentation Engineers., eds. Metro and access networks: APOC 2001, Asia-Pacific optical and wireless communications, 12-15 November 2001, Beijing, China. Bellingham, Wash., USA: SPIE, 2001.

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Wanyi, Gu, Lam Cedric F, Lin Yuan-Hao, Zhongguo guang xue xue hui., and Society of Photo-optical Instrumentation Engineers., eds. Metro and access networks II: APOC 2002 : Asia-Pacific Optical and Wireless Communications : 16-17 October, 2002, Shanghai, China. Bellingham, Wash: SPIE, 2002.

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Book chapters on the topic "Time Division Multiplexing Access"

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Weik, Martin H. "time-division multiplexing." In Computer Science and Communications Dictionary, 1788. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_19629.

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Smith, David R. "Time-Division Multiplexing." In Digital Transmission Systems, 127–88. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4757-1185-1_4.

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Smith, David R. "Time-Division Multiplexing." In Digital Transmission Systems, 177–257. Boston, MA: Springer US, 2004. http://dx.doi.org/10.1007/978-1-4419-8933-8_4.

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Shay, William A. "Time Division Multiplexing." In Handbook of Computer Networks, 568–78. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118256053.ch37.

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Weik, Martin H. "statistical time-division multiplexing." In Computer Science and Communications Dictionary, 1663. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_18214.

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Weik, Martin H. "synchronous time-division multiplexing." In Computer Science and Communications Dictionary, 1712. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_18823.

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Faruque, Saleh. "Time Division Multiplexing (TDM)." In SpringerBriefs in Electrical and Computer Engineering, 91–118. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15609-5_5.

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Weik, Martin H. "asynchronous time-division multiplexing." In Computer Science and Communications Dictionary, 71. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_942.

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Chandra, Kavitha. "Statistical Time Division Multiplexing." In Handbook of Computer Networks, 579–90. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118256053.ch38.

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Selvam, K. C. "Time Division Multipliers—Multiplexing." In Design of Function Circuits with 555 Timer Integrated Circuit, 1–17. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003362968-1.

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Conference papers on the topic "Time Division Multiplexing Access"

1

Spirit, D. M., G. E. Wickens, and L. C. Blank. "4x5Gbit/s optical time division multiplexed nonlinear transmission over 205km." In Nonlinear Guided-Wave Phenomena. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/nlgwp.1991.ma4.

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In order to fulfil the demand for increasingly sophisticated and bandwidth intensive services, telecommunications operators will require flexible optical transmission networks which will operate at higher data rates than those installed to date. At present, the maximum data capacity of installed optical systems is limited by the bandwidth of the electronics in the terminal and repeater equipment (currently around 2.5Gbit/s). Optical wavelength [1] or time [2] division multiplexing techniques may be used to access data rates substantially over 10Gbit/s, offering a substantial increase in capacity. Both multiplexing techniques could be used in conjunction with switching in either the wavelength or time domains to allow increased network flexibility through, for example, the drop-and-insert function. Discrete erbium-doped fibre amplification is an excellent method of compensating for the loss of the transmission link, providing bit-rate independent amplification. However, the regenerative function of conventional opto-electronic repeaters is no longer available in fibre amplifiers: linear dispersion of the optical pulses now becomes a major system constraint. The availability of fibre amplifiers with excellent performance in the 1550nm window restricts the signal wavelength of optically multiplexed systems to this wavelength range, implying the use of dispersion-shifted transmission fibre. The operation of wavelength division multiplexed transmission with more than a few channels over fibre with low dispersion can lead to significant system penalties due to four wave mixing, even over fibre spans of less than 100km [3]. An alternative approach to ultra-high speed transmission is to use time division multiplexing, requiring a transmitter configuration based on short (≈ps) optical pulses. In this instance, nonlinear optical pulse compression in the transmission fibre may be used to advantage to significantly reduce (or even balance completely [4]) the linear dispersion of the optical pulses, permitting transmission well beyond the usual dispersion limit.
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Meliga, M. "Hybrid Distributed Bragg Reflector laser." In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1998. http://dx.doi.org/10.1364/cleo_europe.1998.cfb1.

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Current and future WDM (Wavelength Division Multiplexing) optical systems for access and transport networks require stable, low-chirp and potentially low cost lasers emitting at predetermined (ITU-T grid) wavelengths. In addition advanced OTDM (Optical Time Division Multiplexing) systems require sources for high quality picosecond pulses on the transmitter side and optical devices for clock recovering on the receiver side The HDBR (Hybrid Distibuted Bragg Reflector) laser, also called FGL (Fiber Grating Laser) can meet all previous requirements.
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Kaur, Ramandeep, and Simranjit Singh. "A Time and Wavelength Division Multiplexing based Next Generation Passive Optical Networks Provisioning 80Gbps Symmetrical Access Rate." In 2018 International Conference on Recent Innovations in Electrical, Electronics & Communication Engineering (ICRIEECE). IEEE, 2018. http://dx.doi.org/10.1109/icrieece44171.2018.9009260.

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Li, Kuang-Yu J., and B. Keith Jenkins. "A Collisionless Wavelength-Division Multiple Access Protocol for Free-Space Cellular Hypercube Parallel Computer Systems." In Optical Computing. Washington, D.C.: Optica Publishing Group, 1995. http://dx.doi.org/10.1364/optcomp.1995.otha3.

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The performance of a MIMD parallel computer is critically impacted by the interconnection network performance, which in turn is determined by the network topology, implementation hardware, and communication protocol. Cellular hypercube (CH) interconnection networks, with emphasis on a symmetric cellular hypercube (SCH) network, were studied for the system discussed in this paper because they can exploit the communication locality observed in parallel applications [1], are reasonably scalable due to their O(logN) connectivities, and can be implemented with moderate requirements on the number of wavelength channels needed. While free-space optics can realize highly parallel CH networks [2], little progress has been made in designing an efficient protocol for optical data communication. In this paper a CH interconnection system based on a collisionless wavelength-division multiple access with reroute (WDMA-R) protocol is proposed. This system incorporates space-, time-, and wavelength-multiplexing to achieve dense communication, simple control, and multiple access. Analytic models based on semi-Markov processes were employed to analyze this protocol. The performance of the protocol in terms of network throughput and data packet delay is evaluated and compared to other protocols.
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Prucnal, Paul R., and Mario Santoro. "Local area network with optical spread spectrum processing." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1985. http://dx.doi.org/10.1364/oam.1985.wj25.

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Asynchronous multiplexing schemes are most applicable when the traffic on the network is characterized by relatively long idle periods between the transmitted packets of data. An asynchronous system that provides random access makes the most efficient use of the channel. However, when the intensity of the traffic increases (i.e., the channel is being accessed by many users at the same time), collisions between packets become unavoidable and the throughput of the channel is greatly degraded. To alleviate this problem, spread spectrum multiplexing techniques, commonly known as code division multiple access (CDMA), can be applied. Application of CDMA requires a channel with a large bandwidth, such as an optical channel. Processing the received coded data requires a correlator. If high data rates are used, because of the bandwidth expansion of CDMA, a fast correlator must be implemented. Although for conventional systems this correlation requires sophisticated electronics, optical correlators could handle this fast processing with less complexity. Therefore, the CDMA scheme proposed here was implemented by optically correlating the incoming coded data. One set of codes that show promise for our application are prime sequences obtained from a Galois field GF(P) where P is a prime number and N = P**2. An experiment is described employing a P = 5 code sequence on a 100-Mbps fiber-optic link using 32 chips per bit. This optical CDMA system can potentially allow many more chips per bit, and therefore more users, than conventional systems.
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Liu, Wei, Fang Wei Li, Hai Bo Zhang, and Bo Li. "Research on wireless Powered Communication Networks Sum Rate Maximization based on time Reversal OFDM." In 8th International Conference on Signal, Image Processing and Embedded Systems (SIGEM 2022). Academy and Industry Research Collaboration Center (AIRCC), 2022. http://dx.doi.org/10.5121/csit.2022.122002.

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This paper studies a wireless power communication network(WPCN) based on orthogonal frequency division multiplexing (OFDM) with time reversal(TR). In this paper, the " Harvest Then Transmit " protocol is adopted, and the transmission time block is divided into three stages, the first stage is for power transmission, the second stage is for TR detection, and the third stage is for information transmission. The energy limited access point (AP) and the terminal node obtain energy from the radiofrequency signal sent by the power beacon (PB) to assist the terminal data transmission. The energy limited AP and the terminal node obtain energy from the radio frequency signal sent by the PB to assist the terminal data transmission. In the TR phase and the wireless information transmission (WIT) phase, the terminal transmits the TR detection signal to the AP using the collected energy, and the AP uses the collected energy to transmit independent signals to a plurality of terminals through OFDM. In order to maximize the sum rate of WPCN, the energy collection time and AP power allocation are jointly optimized. Under the energy causal constraint, the subcarrier allocation, power allocation and time allocation of the whole process are studied, and because of the binary variables involved in the subcarrier allocation, the problem belongs to the mixed integer non-convex programming problem. the problem is transformed into a quasiconvex problem, and then binary search is used to obtain the optimal solution. The simulation results verify the effectiveness of this scheme. The results show that the proposed scheme significantly improves the sum rate of the terminal compared to the reference scheme.
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Rambach, K., and Bin Yang. "MIMO radar: time division multiplexing vs. code division multiplexing." In International Conference on Radar Systems (Radar 2017). Institution of Engineering and Technology, 2017. http://dx.doi.org/10.1049/cp.2017.0383.

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Effenberger, Frank J. "Space division multiplexing in access networks." In SPIE OPTO, edited by Benjamin B. Dingel and Katsutoshi Tsukamoto. SPIE, 2015. http://dx.doi.org/10.1117/12.2080204.

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Yu, Jintao, Hoang Anh Du Nguyen, Muath Abu Lebdeh, Mottaqiallah Taouil, and Said Hamdioui. "Time-division Multiplexing Automata Processor." In 2019 Design, Automation & Test in Europe Conference & Exhibition (DATE). IEEE, 2019. http://dx.doi.org/10.23919/date.2019.8715140.

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Hefnawi, Mostafa. "Space division multiplexing access aided cognitive radio networks." In 2012 26th Biennial Symposium on Communications (QBSC). IEEE, 2012. http://dx.doi.org/10.1109/qbsc.2012.6221341.

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Reports on the topic "Time Division Multiplexing Access"

1

Shashoua, R., R. Insler, and M. Anavi. Time Division Multiplexing over IP (TDMoIP). RFC Editor, December 2007. http://dx.doi.org/10.17487/rfc5087.

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Vainshtein, A., ed. Structure-Agnostic Time Division Multiplexing (TDM) over Packet (SAToP). RFC Editor, June 2006. http://dx.doi.org/10.17487/rfc4553.

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Nicklass, O. Managed Objects for Time Division Multiplexing (TDM) over Packet Switched Networks (PSNs). RFC Editor, July 2009. http://dx.doi.org/10.17487/rfc5604.

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Weiner, Andrew M., David D. Nolte, and M. R. Melloch. Holographic Processing of High-Speed Lightwave Signals for the Time-Division Multiplexing. Fort Belvoir, VA: Defense Technical Information Center, April 1997. http://dx.doi.org/10.21236/ada327424.

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Beili, E. xDSL Multi-Pair Bonding Using Time-Division Inverse Multiplexing (G.Bond/TDIM) MIB. RFC Editor, February 2013. http://dx.doi.org/10.17487/rfc6766.

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Vainshtein, A., and S. Galtzur. Layer Two Tunneling Protocol version 3 - Setup of Time-Division Multiplexing (TDM) Pseudowires. RFC Editor, August 2009. http://dx.doi.org/10.17487/rfc5611.

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Vainshtein, A. Control Protocol Extensions for the Setup of Time-Division Multiplexing (TDM) Pseudowires in MPLS Networks. RFC Editor, August 2008. http://dx.doi.org/10.17487/rfc5287.

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Cheng, Julian. Integrated Wavelength-Space-Time Optical Multiplexing Technologies and Architectures for Large-Scale, Reconfigurable, Multiple-Access Computer Networks. Fort Belvoir, VA: Defense Technical Information Center, March 2000. http://dx.doi.org/10.21236/ada375981.

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Prucnal, Paul R., and Stephen R. Forrest. Demonstration of a 100 GBIT/S (GBPS) Scalable Optical Multiprocessor Interconnect System Using Optical Time Division Multiplexing. Fort Belvoir, VA: Defense Technical Information Center, February 2002. http://dx.doi.org/10.21236/ada400586.

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Kazovsky, Leonid G., Ian White, Matt Rogge, Kapil Shrikhande, and Erie Hu. Internet Protocol-Hybrid Opto-Electronic Ring Network (IP-HORNET): A Novel Internet Protocol-Over-Wavelength Division Multiplexing (IP-Over-WDM) Multiple-Access Metropolitan Area Network (MAN). Fort Belvoir, VA: Defense Technical Information Center, April 2003. http://dx.doi.org/10.21236/ada415560.

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