Academic literature on the topic 'Code division multiplexing'

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Journal articles on the topic "Code division multiplexing"

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MOSSBERG, THOMAS W., and MICHAEL G. RAYMER. "Optical Code-Division Multiplexing." Optics and Photonics News 12, no. 3 (2001): 50. http://dx.doi.org/10.1364/opn.12.3.000050.

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Niemack, M. D., J. Beyer, H. M. Cho, et al. "Code-division SQUID multiplexing." Applied Physics Letters 96, no. 16 (2010): 163509. http://dx.doi.org/10.1063/1.3378772.

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Jau, L. L., and Y. H. Lee. "Optical code-division multiplexing systems using Manchester coded Walsh codes." IEE Proceedings - Optoelectronics 151, no. 2 (2004): 81. http://dx.doi.org/10.1049/ip-opt:20040123.

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Farhan, Mhnd. "Performance Analysis of Coded Frequency Division Multiplexing." European Journal of Engineering and Formal Sciences 2, no. 3 (2018): 56. http://dx.doi.org/10.26417/ejef.v2i3.p56-60.

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This paper studies the performance of coded orthogonal frequency division multiplexing system using two modulation techniques, quadrature phase shift keying(QPSK) and quadrature amplitude modulation(QAM). The convolutional code is used as error-correcting-code. The communication channel used is vehicular channel. Simulation results show that the performance of coded orthogonal frequency division multiplexing system with QPSK is better than that with QAM
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Farhan, Mhnd. "Performance Analysis of Coded Frequency Division Multiplexing." European Journal of Engineering and Formal Sciences 2, no. 3 (2018): 56–60. http://dx.doi.org/10.2478/ejef-2018-0017.

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Abstract This paper studies the performance of coded orthogonal frequency division multiplexing system using two modulation techniques, quadrature phase shift keying(QPSK) and quadrature amplitude modulation(QAM). The convolutional code is used as error-correcting-code. The communication channel used is vehicular channel. Simulation results show that the performance of coded orthogonal frequency division multiplexing system with QPSK is better than that with QAM
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Javanmard, Mehdi, and Ronald W. Davis. "Coded Corrugated Microfluidic Sidewalls for Code Division Multiplexing." IEEE Sensors Journal 13, no. 5 (2013): 1399–400. http://dx.doi.org/10.1109/jsen.2013.2242396.

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Solomon, Jonathan, Zeev Zalevsky, and David Mendlovic. "Geometric superresolution by code division multiplexing." Applied Optics 44, no. 1 (2005): 32. http://dx.doi.org/10.1364/ao.44.000032.

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Jau, Liang-Lin, and Yang-Han Lee. "Optical code-division multiplexing systems using common-zero codes." Microwave and Optical Technology Letters 39, no. 2 (2003): 165–67. http://dx.doi.org/10.1002/mop.11158.

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Li, Ming, and Qian Liu. "Fast Code Design for Overloaded Code-Division Multiplexing Systems." IEEE Transactions on Vehicular Technology 65, no. 1 (2016): 447–52. http://dx.doi.org/10.1109/tvt.2015.2393434.

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Stiehl, G. M., W. B. Doriese, J. W. Fowler, et al. "Code-division multiplexing for x-ray microcalorimeters." Applied Physics Letters 100, no. 7 (2012): 072601. http://dx.doi.org/10.1063/1.3684807.

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Dissertations / Theses on the topic "Code division multiplexing"

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Hoffmann, Ceilidh 1969. "Code-division multiplexing." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28746.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004.<br>Includes bibliographical references (p. 395-404).<br>(cont.) counterpart. Among intra-cell orthogonal schemes, we show that the most efficient broadcast signal is a linear superposition of many binary orthogonal waveforms. The information set is also binary. Each orthogonal waveform is generated by modulating a periodic stream of finite-length chip pulses with a receiver-specific signature code that is derived from a special class of binary antipodal, superimposed recursive orthogonal code sequences. With the imposition of practical pulse shapes for carrier modulation, we show that multi-carrier format using cosine functions has higher bandwidth efficiency than the single-carrier format, even in an ideal Gaussian channel model. Each pulse is shaped via a prototype baseband filter such that when the demodulated signal is detected through a baseband matched filter, the resulting output samples satisfy the Generalized Nyquist criterion. Specifically, we propose finite-length, time overlapping orthogonal pulse shapes that are g-Nyquist. They are derived from extended and modulated lapped transforms by proving the equivalence between Perfect Reconstruction and Generalized Nyquist criteria. Using binary data modulation format, we measure and analyze the accuracy of various Gaussian approximation methods for spread-spectrum modulated (SSM) signalling ...<br>We study forward link performance of a multi-user cellular wireless network. In our proposed cellular broadcast model, the receiver population is partitioned into smaller mutually exclusive subsets called cells. In each cell an autonomous transmitter with average transmit power constraint communicates to all receivers in its cell by broadcasting. The broadcast signal is a multiplex of independent information from many remotely located sources. Each receiver extracts its desired information from the composite signal, which consists of a distorted version of the desired signal, interference from neighboring cells and additive white Gaussian noise. Waveform distortion is caused by time and frequency selective linear time-variant channel that exists between every transmitter-receiver pair. Under such system and design constraints, and a fixed bandwidth for the entire network, we show that the most efficient resource allocation policy for each transmitter based on information theoretic measures such as channel capacity, simultaneously achievable rate regions and sum-rate is superposition coding with successive interference cancellation. The optimal policy dominates over its sub-optimal alternatives at the boundaries of the capacity region. By taking into account practical constraints such as finite constellation sets, frequency translation via carrier modulation, pulse shaping and real-time signal processing and decoding of finite-length waveforms and fairness in rate distribution, we argue that sub-optimal orthogonal policies are preferred. For intra-cell multiplexing, all orthogonal schemes based on frequency, time and code division are equivalent. For inter-cell multiplexing, non-orthogonal code-division has a larger capacity than its orthogonal<br>by Ceilidh Hoffmann.<br>Ph.D.
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Khattab, Tamer. "Optical Code Division Multiplexing for sub-wavelength switching systems." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/31083.

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Optical Code Division Multiplexing (OCDMA) is a method used to enable simultaneous transmission of multiple optical data flows over the same fiber using the same wavelength. In OCDMA, isolation between different data flows is achieved using a set of uncorrelated, or loosely correlated, spreading codes to encode the transmitted signal and decode it at the receiver side. The process of encoding and decoding is performed entirely in the optical domain without the need for optical-to-electrical-to-optical conversion. This increases the granularity of traffic isolation in the optical domain while maintaining higher speed switching because of the all-optical encoding/decoding capability. Although code division multiplexing is a well established technique in wireless transmission where all processing of data and switching are performed electronically, there are many challenges in applying this scheme in the optical domain mainly due to the different characteristics of the medium and the fact that negative-valued signals are not easy to produce. This thesis has three main objectives: to deploy OCDMA as a switching mechanism at the sub-wavelength level in order to increase the granularity of traffic isolation in all-optical core switching, to design new mechanisms that enhance the performance of OCDMA as a multiplexing method over long-haul optical fiber transmissions, and to model the performance of OCDMA based switching and multiplexing mechanisms. All-optical switching at the core of the network provides very high speed switching. However, it suffers from low utilization or lack of quality of service guarantees due to lack of fine granularity traffic isolation. This thesis presents an optical network architecture called Optical Code Labeled Generalized Multi-Protocol Label Switching (OC-GMPLS), which utilizes OCDMA as a switching mechanism in backbone GMPLS networks. OC-GMPLS uses OCDMA as an all-optical labeling space in GMPLS switching in order to achieve finer granularity switching at the all-optical network core. The deployment of OC-GMPLS networks mandates performance modeling to show its advantages and to enable tuning of the new network parameters so that performance can be optimized. In this thesis we present an analytical model for the throughput and switching capacity of OC-GMPLS networks. Using our model, we show how to find optimal operating points for OC-GMPLS networks based on physical layer and network layer parameters. The performance of OC-GMPLS networks depends on the performance of OCDMA transmission, which is affected by the modulation method and the optical spreading codes properties. In order to enhance the performance of OC-GMPLS networks, we take two different approaches. The first approach is based on proposing a modulation mechanism that enhances the communication reliability while maintaining low bit error rate for OCDMA transmissions. Our Chip-Level Modulated Binary Pulse Position Modulation (CLM-BPPM) scheme provides a simple to implement (in the all-optical domain) yet a very powerful physical layer method for sending multiple optical flows using OCDMA while maintaining the Bit Error Rate (BER) due to Multiple Access Interference (MAI) effects between these flows at a low level of about 10⁻¹² for 10 simultaneous users. Our method provides a better capability in terms of clock recovery and user activity detection while achieving error rates in the range of those provided by On-Off Keying (OOK). Performance of OCDMA transmission depends to a great extent on the efficiency of the codes used to perform the multiplexing. In order to tackle this side, we investigate the problem of Optical Orthogonal Code (OOC) design by proposing a method called Rejected Delays Reuse (RDR) for constructing OOCs using an element-by-element based greedy algorithm. We show that our method provides a computationally less complex algorithm for designing OOCs, which makes it more practical. Our analysis and simulation results show that OOCs designed using the RDR greedy method are also higher in multiplexing efficiency than OOCs designed using classical element-by-element constructions. This is because RDR designed OOCs possesses smaller code lengths for the same code cardinality and weight than their counterpart classical element-by-element greedy designed codes.<br>Applied Science, Faculty of<br>Electrical and Computer Engineering, Department of<br>Graduate
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Jacobson, Carl P. "Code Division Multiplexing of Fiber Optic and Microelectromechanical Systems (MEMS) Sensors." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/27486.

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Multiplexing has evolved over the years from Emile Baudot's method of transmitting six simultaneous telegraph signals over one wire to the high-speed mixed-signal communications systems that are now commonplace. The evolution started with multiplexing identical information sources, such as plain old telephone service (POTS) devices. Recently, however, methods to combine signals from different information sources, such as telephone and video signals for example, have required new approaches to the development of software and hardware, and fundamental changes in the way we envision the basic block diagrams of communication systems. The importance of multiplexing cannot be overstated. To say that much of the current economic and technological progress worldwide is due in part to mixed-signal communications systems would not be incorrect. Along the vein of advancing the state-of-the-art, this dissertation research addresses a new area of multiplexing by taking a novel approach to network different-type sensors using software and signal processing. Two different sensor types were selected, fiber optics and MEMS, and were networked using code division multiplexing. The experimentation showed that the interconnection of these sensors using code division multiplexing was feasible and that the mixed signal demultiplexing software unique to this research allowed the disparate signals to be discerned. An analysis of an expanded system was performed with the results showing that the ultimate number of sensors that could be multiplexed with this technique ranges from the hundreds into the millions, depending on the specific design parameters used. Predictions about next-next generation systems using the techniques developed in the research are presented.<br>Ph. D.
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Umrani, Fahim Aziz. "Applications of perfect difference codes in fiber-optics and wireless optical code-division multiplexing/multiple-access systems." Thesis, University of South Wales, 2009. https://pure.southwales.ac.uk/en/studentthesis/applications-of-perfect-difference-codes-in-fiberoptics-and-wireless-optical-codedivision-multiplexingmultipleaccess-systems(4025609f-d2a6-4c46-9578-784403202887).html.

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After establishing itself in the radio domain, Spread spectrum code-division multiplexing/multiple-access (CDMA) has seen a recent upsurge in optical domain as well. Due to its fairness, flexibility, service differentiation and increased inherent security, CDMA is proved to be more suitable for the bursty nature of local area networks than synchronous multiplexing techniques like Frequency/Wavelength Division Multiplexing (F/WDM) and Time Division Multiplexing (TDM). In optical domain, CDMA techniques are commonly known as Optical-CDMA (O-CDMA). All optical CDMA systems are plagued with the problem of multiple-access interference (MAI). Spectral amplitude coding (SAC) is one of the techniques used in the literature to deal with the problem of MAI. The choice of spreading code in any CDMA system is another way to ensure the successful recovery of data at the receiving end by minimizing the effect of MAI and it also dictates the hardware design of the encoder and decoder. This thesis focuses on the efficient design of encoding and decoding hardware. Perfect difference codes (PDC) are chosen as spreading sequences due to their good correlation properties. In most of the literature, evaluation of error probability is based on the assumptions of ideal conditions. Such assumptions ignore major physical impairments such as power splitting losses at the multiplexers of transmitters and receivers, and gain losses at the receivers, which may in practice be an overestimate or underestimate of the actual probability of error. This thesis aims to investigate thoroughly with the consideration of practical impairments the applications of PDCs and other spreading sequences in optical communications systems based on spectral-amplitude coding and utilizing codedivision as multiplexing/multiple-access technique. This work begins with a xix general review of optical CDMA systems. An open-ended practical approach has been used to evaluate the actual error probabilities of OCDM/A systems under study. It has been concluded from results that mismatches in the gains of photodetectors, namely avalanche photodiode (APDs), used at the receiver side and uniformity loss in the optical splitters results in the inaccurate calculation of threshold level used to detect the data and can seriously degrade the system bit error rate (BER) performance. This variation in the threshold level can be compensated by employing techniques which maintain a constant interference level so that the decoding architecture does not have to estimate MAI every time to make a data bit decision or by the use of balanced sequences. In this thesis, as a solution to the above problem, a novel encoding and decoding architecture is presented for perfect difference codes based on common zero code technique which maintains a constant interference level at all instants in CDM system and thus relieves the need of estimating interference. The proposed architecture only uses single multiplexer at the transmitters for all users in the system and a simple correlation based receiver for each user. The proposed configuration not only preserves the ability of MAI in Spectral-Amplitude Coding SAC-OCDM system, but also results in a low cost system with reduced complexity. The results show that by using PDCs in such system, the influence of MAI caused by other users can be reduced, and the number of active users can be increased significantly. Also a family of novel spreading sequences are constructed called Manchestercoded Modified Legendre codes (MCMLCs) suitable for SAC based OCDM systems. MCMLCs are designed to be used for both single-rate and Multirate systems. First the construction of MCMLCs is presented and then the bit error rate performance is analyzed. Finally the proposed encoding/decoding architecture utilizing perfect difference codes is applied in wireless infrared environment and the performance is found to be superior to other codes.
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Shao, Lei. "Code design for MIMO-OFDM(A) systems /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/5859.

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Tureli, Didem Kivanc. "Resource allocation for multicarrier communications /." Thesis, Connect to this title online; UW restricted, 2005. http://hdl.handle.net/1773/6068.

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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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Sathananthan, K. "Broadband wireless communications: issues of OFDM and multi-code CDMA." Monash University, School of Computer Science and Software Engineering, 2003. http://arrow.monash.edu.au/hdl/1959.1/9401.

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雷靜 and Jing Lei. "Frequency synchronization methods for digital broadband receivers." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B31244427.

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Thanabalasingham, Thayaparan. "Resource allocation in OFDM cellular networks /." Connect to thesis, 2006. http://eprints.unimelb.edu.au/archive/00003227.

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Books on the topic "Code division multiplexing"

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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. SPIE, 2002.

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Wanyi, Gu, Zhou Jianhui, Pan Jin-Yi, et al., eds. Metro and access networks: APOC 2001, Asia-Pacific optical and wireless communications, 12-15 November 2001, Beijing, China. SPIE, 2001.

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Raphael, David. Pulse code modulation encoder handbook for Aydin Vector MMP-900 series system. National Aeronautics and Space Administration, Goddard Space Flight Center, 1995.

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Raphael, David. Pulse code modulation encoder handbook for Aydin Vector MMP-900 series system. National Aeronautics and Space Administration, Goddard Space Flight Center, 1995.

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Raphael, David. Pulse code modulation encoder handbook for Aydin Vector MMP-900 series system. National Aeronautics and Space Administration, Goddard Space Flight Center, 1995.

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Roderick, David V. A coded orthogonal frequency division multiplexing simulation of a high data rate, line-of-sight, digital radio for mobile maritime communications. Naval Postgraduate School, 1997.

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Redinbo, Robert. Fault tolerance in space-based digital signal processing and switching systems: Protecting up-link processing resources, demultiplexer, demodulator, and decoder : final report June 1990 - September 1994. National Aeronautics and Space Administration, 1994.

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Schulze, Henrik, and Christian Lueders. Theory and Applications of OFDM and CDMA: Wideband Wireless Communications. Wiley & Sons, Incorporated, John, 2008.

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Theory and Applications of OFDM and CDMA: Wideband Wireless Communications. Wiley, 2005.

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1938-, Garg Vijay Kumar, Nassar Carl R, Shattil Steve J, Society of Photo-optical Instrumentation Engineers., and Colorado Photonics Industry Association, eds. Enabling technologies for 3G and beyond: 22-23 August 2001, Denver, USA. SPIE, 2001.

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Book chapters on the topic "Code division multiplexing"

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Sotobayashi, Hideyuki. "Synchronous Optical Code Division Multiplexing Systems." In Handbook of Computer Networks. John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118256053.ch55.

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Rzeszewski, T. S., and A. L. Lentine. "A Photonic Switch Architecture Utilizing Code Division Multiplexing." In Photonic Switching. Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73388-8_33.

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Atarashi, Hiroyuki, and Mamoru Sawahashi. "Variable Spreading Factor Orthogonal Frequency and Code Division Multiplexing (VSF-OFCDM)." In Multi-Carrier Spread-Spectrum & Related Topics. Springer US, 2002. http://dx.doi.org/10.1007/978-1-4757-3569-7_11.

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Yang, Di, Xinyue Liu, Change Zeng, and Yonghong Zhan. "Study on the Geometric Super Resolution by Code Division Multiplexing Technology." In Proceedings of the 28th Conference of Spacecraft TT&C Technology in China. Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-4837-1_28.

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Cariou, L., and J. F. Hélard. "Superimposed Pilot-based Channel Estimation for MIMO OFDM Code Division Multiplexing Uplink Systems." In Multi-Carrier Spread-Spectrum. Springer Netherlands, 2006. http://dx.doi.org/10.1007/1-4020-4437-2_26.

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Wan, Wei, Le Tang, and Hang Tu. "Synchronization Algorithms Applied to Code Division Multiplexing Link Based on the Walsh Code of Ground Based Beamforming." In Electronics, Communications and Networks V. Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-0740-8_42.

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Sun, Siyue, Guang Liang, and Kun Wang. "A Serial Time-Division-Multiplexing Chip-Level Space-Time Coded Multi-user MIMO System Based on Three Dimensional Complementary Codes." In Machine Learning and Intelligent Communications. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-52730-7_11.

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Rambo, Eberle A., and Rolf Ernst. "ASTEROID and the Replica-Aware Co-scheduling for Mixed-Criticality." In Dependable Embedded Systems. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-52017-5_3.

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AbstractThe ASTEROID project developed a cross-layer fault-tolerance solution to provide reliable software execution on unreliable hardware under soft errors. The approach is based on replicated software execution with hardware support for error detection that exploits future many-core platforms to increase reliability without resorting to redundancy in hardware. This chapter gives an overview of ASTEROID and then focuses on the performance of replicated execution and the proposed replica-aware co-scheduling for mixed-criticality. The performance of systems with replicated execution strongly depends on the scheduling. Standard schedulers, such as Partitioned Strict Priority Preemptive (SPP) and Time-Division Multiplexing (TDM)-based ones, although widely employed, provide poor performance in face of replicated execution. By exploiting co-scheduling, the replica-aware co-scheduling is able to achieve superior performance.
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Zouine, Younes, and Zhour Madini. "Direct Sequence-Optical Code-Division Multiple Access (DS-OCDMA): Receiver Structures for Performance Improvement." In Multiplexing. IntechOpen, 2019. http://dx.doi.org/10.5772/intechopen.85860.

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Sotobayashi, Hideyuki. "Hybrid Multiplexing Techniques (OCDMA/TDM/WDM)." In Optical Code Division Multiple Access. CRC Press, 2018. http://dx.doi.org/10.1201/9781315221113-7.

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Conference papers on the topic "Code division multiplexing"

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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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Tsuda, Hiroyuki, Hirokazu Takenouchi, Tetsuyoshi Ishii, et al. "Photonic Spectral EncoderIDecoder Using an Arrayed-Waveguide Grating for Coherent Optical Code Division Multiplexing." In Wavelength Division Multiplexing Components. OSA, 1999. http://dx.doi.org/10.1364/wdm.1999.206.

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Lam, Cedric F., Rutger B. Vrijien, Ming C. Wu, Eli Yablonovitch, and Dennis T. K. Tong. "Multiwavelength optical code division multiplexing." In Critical Review Collection. SPIE, 1999. http://dx.doi.org/10.1117/12.335924.

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Liyana Nik Man, N. N., M. Mokhtar, and F. Khosravi. "Development of three level code division multiplexing over wavelength division multiplexing." In 2014 IEEE 5th International Conference on Photonics (ICP). IEEE, 2014. http://dx.doi.org/10.1109/icp.2014.7002360.

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Kolosovs, Deniss, and Elmars Bekeris. "Chaos Code Division Multiplexing Communication System." In 2015 7th International Conference on Computational Intelligence, Communication Systems and Networks (CICSyN). IEEE, 2015. http://dx.doi.org/10.1109/cicsyn.2015.22.

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Kuo, Chung J., and Harriett Rigas. "Images Multiplexing By Code Division Technique." In 33rd Annual Techincal Symposium, edited by Andrew G. Tescher. SPIE, 1990. http://dx.doi.org/10.1117/12.962322.

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Tsoeu, M. S., and M. R. Inggs. "Electrical impedance tomography using code division multiplexing." In IEEE AFRICON 2015. IEEE, 2015. http://dx.doi.org/10.1109/afrcon.2015.7331988.

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Wei, Lili, Stella N. Batalama, Dimitris A. Pados, and Bruce Suter. "Cooperative Transmissions over Code Division Multiplexing Channels." In MILCOM 2007 - IEEE Military Communications Conference. IEEE, 2007. http://dx.doi.org/10.1109/milcom.2007.4454961.

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Huang, Y. H., Chao Lug, P. K. A. Wai, and H. Y. Tam. "Large-scale FBG sensors utilizing code division multiplexing." In 2008 Conference on Lasers and Electro-Optics (CLEO). IEEE, 2008. http://dx.doi.org/10.1109/cleo.2008.4551324.

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Sun, Peng, Daoben Li, and Li Fang. "Design of simplified overlapped code division multiplexing system." In Signal Processing (WCSP 2011). IEEE, 2011. http://dx.doi.org/10.1109/wcsp.2011.6096936.

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Reports on the topic "Code division multiplexing"

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Yablonovitch, Eli. Multi-Wavelength Optical Code-Division-Multiplexing Based on Passive, Linear, Unitary Filters. Defense Technical Information Center, 1998. http://dx.doi.org/10.21236/ada361203.

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Bennett, C., and A. Mendez. 32 X 2.5 Gb/s Optical Code Division Multiplexing (O-CDM) For Agile Optical Networking (Phase II) Final Report CRADA No. TC02051.0. Office of Scientific and Technical Information (OSTI), 2017. http://dx.doi.org/10.2172/1396229.

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