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Artykuły w czasopismach na temat "CDMA"

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Kawski, A., B. Kukliński, and P. Bojarski. "Influence Of The Irradiation Time On The Absorption And Emission Spectra Of P-Cyano-N,N-Dialkylanilines In Polar Solvents." Zeitschrift für Naturforschung A 58, no. 7-8 (2003): 411–18. http://dx.doi.org/10.1515/zna-2003-7-805.

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The effect of the time of irradiation with the excitation wavelength λexc on the absorption and emission spectra of p-cyano-N,N-dimethylaniline (CDMA), p-cyano-N,N-diethylaniline (CDEA) and N,N- dimethylaniline (DMA) in acetonitrile and in n-hexane, as well as the effect of high temperature is studied. It is found that after sufficiently long irradiation of CDMA and CDEA in acetonitrile the short wavelength SE band intensity strongly increases compared to that of the long wavelength LE band. This phenomenon is caused by the photolysis of CDMA and CDEA in polar solvents. In each case both the i
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Kim, Taeyoon, Jeffrey G. Andrews, Jaeweon Kim, and Theodore S. Rappaport. "Multi-code Multicarrier CDMA: Performance Analysis." Journal of Communications Software and Systems 2, no. 1 (2017): 12. http://dx.doi.org/10.24138/jcomss.v2i1.301.

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A new multi-code multicarrier code division multiple access (MC-MC-CDMA) system is proposed and analyzed in afrequency selective fading channel. By allowing each user to transmit an M-ary code sequence, the proposed MC-MC-CDMA system can support various data rates as required by next generation standards without increasing the interference which is common in general multicarrier CDMA systems. The bit error rate of the system is analytically derived in frequency selective fading, with Gaussian noise and multiple access interference. The results show that the proposed MC-MC-CDMA system clearly o
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YU, XIANGBIN, XIAODONG ZHANG, and GUANGGUO BI. "PERFORMANCE ANALYSIS OF MULTICARRIER CDMA SYSTEM BASED ON COMPLEX WAVELET PACKET AND SPACE–TIME BLOCK CODES IN RAYLEIGH FADING CHANNEL." Journal of Circuits, Systems and Computers 15, no. 01 (2006): 57–74. http://dx.doi.org/10.1142/s0218126606002939.

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On the basis of analyzing the principle of multicarrier CDMA (MC-CDMA) technique and space–time coding technique, using the optimized complex wavelet packet as multicarrier modulation, a novel MC-CDMA system based on complex wavelet packet and space–time block codes is proposed. The bit error rate (BER) performance of the system is investigated in Rayleigh fading channel, and the corresponding BER expression is derived in detail. The system can overcome the decrease of spectrum efficiency of conventional MC-CDMA due to inserting cyclic prefix (CP). Moreover, the application of space–time codin
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Hawej, M. "INTERFERENCE MITIGATION BASED ON CARRIER INTERFEROMETRY CODES IN THE DOWNLINK LOW EARTH ORBIT SATELLITE CHANNEL." مجلة الجامعة الأسمرية: العلوم التطبيقية 6, no. 5 (2021): 523–35. http://dx.doi.org/10.59743/aujas.v6i5.1509.

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The multi-carrier code division multiple access (MC-CDMA) system employs the Hadamard-Walsh (HW) code in the low earth orbit (LEO) satellite systems. It has been used as spreading code to maintain the multi-access interference (MAI) in the downlink LEO satellite channel. However, due to the non-orthogonality of the HW codes, these interferences are observed at the MC-CDMA satellite receiver. As a result, the LEO satellite system performance is degraded. In this paper, we propose to employ the orthogonal Carrier Interferometry (CI) code with MC-CDMA in the downlink LEO satellite channel. A new
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Zouggaret, Abdelhak, Mokhtar Besseghier, Youcef Islam Djilani Kobibi, Hocine Abdelhak Azzeddine, and Samir Ghouali. "Medical images transmission over MC-MC-CDMA based MRC detection." STUDIES IN ENGINEERING AND EXACT SCIENCES 5, no. 3 (2024): e12478. https://doi.org/10.54021/seesv5n3-033.

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The increasing demand for high data rate multimedia transmission in wireless networks necessitates robust and spectrally efficient technologies. Multi-code multi-carrier code division multiple access (MC-MC-CDMA) presents a promising solution by combining the advantages of multi-code CDMA and multi-carrier CDMA techniques. This paper comprehensively investigates the MC-MC-CDMA system for medical image transmission applications. A detailed system model is developed, including the transmitter, channel, and maximum ratio combining (MRC) receiver. Analytical expressions for the bit error rate (BER
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Zheng, Liang, and Bin Yan. "The Performance Analysis of CDMA Traffic Access Self-Similar Equalization Protocol." Applied Mechanics and Materials 490-491 (January 2014): 1205–8. http://dx.doi.org/10.4028/www.scientific.net/amm.490-491.1205.

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The random access technique has a bigger influence to the performance optimization of CDMA data traffic. A CDMA random access technique based on self-similar model and its performance analysis are put forward in this paper. The simulation results indicate that the access performance of CDMA data traffic based on self-similar model is attenuated by power law, related to such parameters as fractal coefficient H and network load G. The CDMA traffic access self-similar equalization protocol (TASEP) is put forward and it can improve the access performance of CDMA data traffic distinctly.
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Harlen, Sekar, Eva Yovita Dwi Utami, and Andreas Ardian Febrianto. "Bit Error Rate pada Sistem MIMO MC-CDMA dengan Teknik Alamouti-STBC." Techné : Jurnal Ilmiah Elektroteknika 16, no. 02 (2017): 99–109. http://dx.doi.org/10.31358/techne.v16i02.163.

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Pada makalah ini dilaporkan hasil penelitian sistem MIMO MC-CDMA dengan teknik Alamouti Space Time Block Code (STBC) menggunakan dua antena pengirim dan dua antena penerima. Kinerja sistem diukur dengan nilai Bit Error Rate (BER). Sistem yang diteliti disimulasikan dengan Matlab, dengan variasi jumlah pengguna, jumlah subpembawa, kecepatan pergerakan pengguna dan frekuensi Doppler. Hasil simulasi menunjukkan BER sistem MIMO MC-CDMA tidak mengalami penurunan yang tajam ketika jumlah pengguna dan frekuensi Doppler meningkat. Sedangkan simulasi dengan peningkatan jumlah subpembawa mampu menurunka
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Anyaegbu, A., J.N. Dike, and P. Elagauma. "TRAFFIC PERFORMANCE COMPARISON OF CDMA AND FDMA ON CELLULAR NETWORK." Continental J. Engineering Sciences 6, no. 3 (2011): 14–25. https://doi.org/10.5281/zenodo.833979.

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This paper provides the traffic performance comparison of CDMA and FDMA in a cellular network. With the ever increasing demand for fast internet access, multimedia services and other data based services, the need for larger network and bandwidth capability cannot be over-emphasized. These services involves either CDMA or FDMA, hence the need for this comparison. We derived Erlang capacity “formulas” for the CDMA and FDMA cellular system and a MATLAB simulation was carried out using the formulas. The results showed that the total number of Erlang of traffic that a CDMA sector can service is abo
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Ambrosio, Jefferson Santos, Francisco De Assis Scannavino Junior, and Taufik Abrão. "Seleção de sequências de espalhamento e Desempenho de Sistemas DS/CDMA." Semina: Ciências Exatas e Tecnológicas 37, no. 1 (2016): 55. http://dx.doi.org/10.5433/1679-0375.2016v37n1p55.

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Neste trabalho são discutidos conceitos fundamentais relativo à comunicação de múltiplo acesso por divisão de código (CDMA). Especificamente, analisa-se o impacto da seleção de sequências de espalhamento sobre o desempenho e capacidade, em termos de número máximo de usuários suportados, em sistemas CDMA por sequência direta (DS/CDMA), considerando ambientes com ruído branco Gaussiano, carregamento de sistema variável e múltiplas antenas (MISO-CDMA).
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Panday, Sarika, and Saurabh Sardey. "GSM and CDMA Based Communication System." Journal of Communication Engineering and its Innovations 8, no. 2 (2022): 21–25. http://dx.doi.org/10.46610/jocei.2022.v08i02.004.

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Cellular mobile services have been around for a while and are continuously developing today. Numerous communication services, including CDMA and GSM, developed alongside these services. The two most significant technical standards for mobile communication are CDMA and GSM. The GSM and CDMA both transform mobile phone data into radio waves. However, these technologies differ in terms of how calls and data transfer occur through a network. One of the primary distinctions between CDMA and GSM is that CDMA doesn't require a SIM card and instead relies on ESNs to link a mobile phone to its network
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Rozprawy doktorskie na temat "CDMA"

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Deus, Junior Getulio Antero de. "Sistemas FFH-CDMA codificados." [s.n.], 2002. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260269.

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Orientador : Jaime Portugheis<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação<br>Made available in DSpace on 2018-08-02T01:11:32Z (GMT). No. of bitstreams: 1 DeusJunior_GetulioAnterode_D.pdf: 9215941 bytes, checksum: 93364e4dd602d44e4f2d6d1758043dfd (MD5) Previous issue date: 2002<br>Resumo: Neste trabalho é desenvolvido um estudo sobre um sistema FFH-CDMA cujo receptor de máxima verossimilhança (MV) não-quantizado necessita de uma não-linearidade de difícil implementação. Para um sistema FFH-CDMA não-codificado propomos a utilização
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Venkatasubramanian, Ramasamy. "Beamforming for MC-CDMA." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/31287.

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Orthogonal Frequency Division Multiplexing (OFDM) has recently gained a lot of attention and is a potential candidate for Fourth Generation (4G) wireless systems because it promises data rates up to 10Mbps. A variation of OFDM is Multi-Carrier CDMA (MC-CDMA) which is an OFDM technique where the individual data symbols are spread using a spreading code in the frequency domain. The spreading code associated with MC-CDMA provides multiple access technique as well as interference suppression. Often times in cellular and military environments the desired signal can be buried below interference. I
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LE, BOT MARIE. "Antennes adaptatives en CDMA." Paris, CNAM, 2001. http://www.theses.fr/2001CNAM0384.

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Ce rapport de these traite de la demodulation a la station de base multi-capteurs dans le cadre d'une communication radiomobile en cdma. Apres un rappel du systeme cdma, nous analysons le canal de propagation. Nous presentons le recepteur optimal (mlse) dans le cas general d'une modulation lineaire, puis applique au cdma. Nous valorisons alors le role des codes d'etalement dans la demodulation en les separant du traitement spatio-temporel, qui est adapte au canal et rejette les brouilleurs. Nous proposons deux facons differentes de mettre en uvre le mlse, qui tiennent compte de la coloration s
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SHARMA, ANSHUL. "Performance Analysis of MC-CDMA and CI/MC-CDMA Using Interference Cancellation Techniques." University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1218826853.

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SHEN, HANHONG. "SEMIBLIND MULTIUSER DETECTION FOR MC-CDMA." University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1127324165.

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Jakubek, David Andrew. "Coherent/noncoherent detection of coherent optical heterodyne DPSK-CDMA and MFSK-CDMA signals." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/28033.

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Haiou, Zheng, and Zhang Naitong. "ANALYSIS OF HYBRID FDMA/CDMA SYSTEMS IN RICIAN FADING." International Foundation for Telemetering, 1999. http://hdl.handle.net/10150/606808.

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International Telemetering Conference Proceedings / October 25-28, 1999 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>In this paper, a hybrid frequency division multiple access/code division multiple access (FDMA/CDMA) system in a Rician fading channel is described and analysis. The performance of the hybrid system is compared with a wideband CDMA system, which occupies the same total bandwidth. The results show that for DPSK modulation with a RIKE receiver, a hybrid system can have a greater capacity with a strong direct path component or a high signal to noise ratio (SNR).
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Cheung, Tze Chiu. "2GHz W-CDMA Radio Transceiver." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/36411.

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A radio transceiver has been designed and built for a W-CDMA experimental system operating at 2GHz. The radio is an RF front-end for mobile terminals. The radio provides the functions of modulation and demodulation to enable transmitting and receiving digital information through the air link. The radio comprises one transmitter in conjunction with transmit power control (TPC), two independent receivers in conjunction with automatic gain control (AGC) and automatic frequency control (AFC), and one common synthesizer. Data exchange between the radio and the baseband processor takes place i
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Duran, Omer Agah. "Multiuser Receivers For Cdma Downlink." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609953/index.pdf.

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In this thesis, multiuser receivers for code division multiple-access (CDMA) downlink are studied under frequency selective fading channel conditions. The receivers investigated in this thesis attempt to estimate desired symbol as a linear combination of chip-rate sampled received signal sequence. A common matrix-vector representation of signals, which is similar to the model given by Paulraj et. al. is constructed in order to analyze the receivers studied in this thesis. Two receivers already well known in the literature are introduced and derived by using the common signal model. One of th
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Wan, William Ming. "Digital CDMA multi-carrier demodulator." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/MQ28260.pdf.

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Książki na temat "CDMA"

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Tachikawa, Keiji, ed. W-CDMA. John Wiley & Sons, Ltd, 2002. http://dx.doi.org/10.1002/0470854642.

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Tachikawa, Keiji, ed. W-CDMA. John Wiley & Sons, Ltd, 2002. http://dx.doi.org/10.1002/0470854642.

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Ghafouri-Shiraz, Hooshang, and M. Massoud Karbassian. Optical CDMA Networks. John Wiley & Sons, Ltd, 2012. http://dx.doi.org/10.1002/9781119941330.

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Hanzo, L., and T. Keller. OFDM and MC-CDMA. John Wiley & Sons, Ltd, 2006. http://dx.doi.org/10.1002/9780470031384.

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Ipatov, Valery P. Spread Spectrum and CDMA. John Wiley & Sons, Ltd, 2005. http://dx.doi.org/10.1002/0470091800.

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Chen, Hsiao-Hwa. Next generation CDMA technologies. John Wiley, 2007.

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Ipatov, Valery P. Spread Spectrum and CDMA. John Wiley & Sons, Ltd., 2005.

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Yang, Samuel C. CDMA RF system engineering. Artech House, 1998.

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E, Miller Leonard, ed. CDMA systems engineering handbook. Artech House, 1998.

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Buehrer, R. Michael. Code Division Multiple Access (CDMA). Springer International Publishing, 2006. http://dx.doi.org/10.1007/978-3-031-01673-8.

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Części książek na temat "CDMA"

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Klostermeyer, Rüdiger. "Codespreizverfahren — CDMA." In Digitale Modulation. Vieweg+Teubner Verlag, 2001. http://dx.doi.org/10.1007/978-3-322-89549-3_6.

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Wong, Marcus. "CDMA Femtocells." In Femtocells. River Publishers, 2022. http://dx.doi.org/10.1201/9781003338178-6.

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Xavier, Bruno de Souza Abreu, and Arlindo Moreira Fartes Filho. "CDMA Evolution." In Designing cdma2000® Systems. John Wiley & Sons, Ltd, 2005. http://dx.doi.org/10.1002/0470020121.ch2.

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Hassan, Amer A., John E. Hershey, and Gary J. Saulnier. "Spatial Optical CDMA." In Perspectives in Spread Spectrum. Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5531-5_5.

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Höher, Peter Adam. "DS-CDMA-Empfängerkonzepte." In Grundlagen der digitalen Informationsübertragung. Vieweg+Teubner, 2011. http://dx.doi.org/10.1007/978-3-8348-9927-9_23.

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Stüber, Gordon L. "CDMA Cellular Systems." In Principles of Mobile Communication. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55615-4_12.

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Höher, Peter Adam. "DS-CDMA-Empfängerkonzepte." In Grundlagen der digitalen Informationsübertragung. Springer Fachmedien Wiesbaden, 2013. http://dx.doi.org/10.1007/978-3-8348-2214-7_24.

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Terré, Michel, Mylène Pischella, and Emmanuelle Vivier. "CDMA and UMTS." In Wireless Telecommunication Systems. John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118625422.ch3.

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Stüber, Gordon L. "CDMA Cellular Systems." In Principles of Mobile Communication. Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4614-0364-7_12.

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Silva, Paulo, and Rui Dinis. "DS-CDMA and MC-CDMA Systems with Nonlinear Transmitters." In Frequency-Domain Multiuser Detection for CDMA Systems. River Publishers, 2022. http://dx.doi.org/10.1201/9781003338208-5.

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Streszczenia konferencji na temat "CDMA"

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Nakamura, Moriya, and Ken-ichi Kitayama. "Error-free Transmission in Optical Space-CDMA for 2-D Parallel Data Links." In Optics in Computing. Optica Publishing Group, 1997. http://dx.doi.org/10.1364/oc.1997.othd.9.

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Code division multiple access (CDMA) is an asynchronous, random access protocol. In conventional time-domain CDMAs, each data bit is encoded into a waveform which corresponds to a signature code sequence [1], [2]. We have proposed and experimentally demonstrated a space-CDMA for parallel transmission aiming at the applications to future high-throughput 2-D parallel data links connecting massively parallel processors of a number of data bits regularly aligned on two-dimensional (2-D) grids, so-called bit-planes [3], [4].
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Inaty, Elie, Robert Raad, and Paul Fortier. "CDMA based dynamic bandwidth allocation (CDBA) scheme for EPON." In ICC 2012 - 2012 IEEE International Conference on Communications. IEEE, 2012. http://dx.doi.org/10.1109/icc.2012.6364134.

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Takasago, K., T. Furusawa та F. Kanuari. "Femtosecond code-division multiple-access system with 1.3 μm Cr:forsterite laser". У The European Conference on Lasers and Electro-Optics. Optica Publishing Group, 1998. http://dx.doi.org/10.1364/cleo_europe.1998.ctui63.

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There is increasing interest in utilizing optical code-division multiple-access (CDMA) schemes in fiber-optic local area networks because of its wide bandwidth, high information security, and the capability for multiple access. Both synchronous and asynchronous optical CDMA system have been actively studied. In general, the numbers of subscribers and the simultaneous users are larger in the synchronous CDMA although the system is more complex. However, a femtosecond CDMA scheme based on spectral encoding and decoding, which is categorized as an asynchronous scheme [1], can allow a large number
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Lee, Yoonill. "Performance Analysis of DS-CDMA and MC-CDMA Systems." In 2018 9th IEEE Annual Ubiquitous Computing, Electronics & Mobile Communication Conference (UEMCON). IEEE, 2018. http://dx.doi.org/10.1109/uemcon.2018.8796635.

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Wu, Zhiqiang, and Carl R. Nassar. "Ultra wideband MC-CDMA and CI/MC-CDMA systems." In ITCom 2002: The Convergence of Information Technologies and Communications, edited by Carl R. Nassar. SPIE, 2002. http://dx.doi.org/10.1117/12.455395.

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Ma, Meng, Yuli Yang, Hongbing Cheng, and Bingli Jiao. "A Capacity Comparison Between MC-CDMA and CP-CDMA." In IEEE Vehicular Technology Conference. IEEE, 2006. http://dx.doi.org/10.1109/vtcf.2006.363.

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Vethanayagam, N., and R. I. MacDonald. "Demonstration of a Novel Optical Code Division Multiplex system at 800 MChips/s." In Photonic Switching. Optica Publishing Group, 1991. http://dx.doi.org/10.1364/phs.1991.we5.

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Direct sequence Code Division Multiple Access (CDMA) provides a method of exploiting the wide bandwidth offered by optical fibres without the added complexity of wideband electronics. Each data bit is encoded with a code sequence (of N chips) which represents the destination address of each data bit. The correct selection of orthogonal codes allows the data bit destined for a given receiver to be extracted in the presence of noise (i.e., interference from other users in the system). Due to the uni-polar nature of light, coding schemes used in conventional CDMA cannot be applied directly to opt
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Frigyes, Istvan. "CDMA in Optics." In 2006 IEEE Ninth International Symposium on Spread Spectrum Techniques and Applications. IEEE, 2006. http://dx.doi.org/10.1109/isssta.2006.311813.

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Ali, Zahid, Mohamad A. Deriche, and Mohamed Adnan Landolsi. "CDMA multiuser radiolocation." In 2010 IEEE 21st International Symposium on Personal, Indoor and Mobile Radio Communications Workshops (PIMRC Workshops). IEEE, 2010. http://dx.doi.org/10.1109/pimrcw.2010.5670369.

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Leeson, M. S., K. Cui, and E. L. Hines. "Enhancing optical CDMA." In 2009 11th International Conference on Transparent Optical Networks (ICTON). IEEE, 2009. http://dx.doi.org/10.1109/icton.2009.5185306.

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Raporty organizacyjne na temat "CDMA"

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Ghaffari, B., and E. Geraniotis. Analysis of Coherent Random-Carrier CDMA and Hybrid WDMA/CDMA Multiplexing for High-Capacity Optical Networks. Defense Technical Information Center, 1989. http://dx.doi.org/10.21236/ada454792.

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Verdu, Sergio. Multi-User Detection for Next-Generation CDMA. Defense Technical Information Center, 2000. http://dx.doi.org/10.21236/ada391148.

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Yokota, H., and G. Dommety. Mobile IPv6 Fast Handovers for 3G CDMA Networks. RFC Editor, 2008. http://dx.doi.org/10.17487/rfc5271.

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Honig, Michael L. Linear Interference Suppression and Pulse Optimization for DS-CDMA. Defense Technical Information Center, 1999. http://dx.doi.org/10.21236/ada371495.

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Mitra, Urbashi. Instrumentation to Support Advanced Research in Wireless CDMA Communications. Defense Technical Information Center, 2003. http://dx.doi.org/10.21236/ada419513.

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Irizarry, Alfredo V. Average Likelihood Methods for Code Division Multiple Access (CDMA). Defense Technical Information Center, 2014. http://dx.doi.org/10.21236/ada603961.

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Irizarry, Alfredo V. Average Likelihood Methods of Classification of Code Division Multiple Access (CDMA). Defense Technical Information Center, 2016. http://dx.doi.org/10.21236/ad1009582.

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Mitra, Urbashi. New Robust Estimation/Detection Techniques With Applications to Wireless CDMA Communications. Defense Technical Information Center, 1999. http://dx.doi.org/10.21236/ada379418.

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Wieselthier, Jeffrey E., Anthony Ephremides, and Julie A. Tarr. A Distributed Reservation-Based CDMA Protocol That Does Not Require Feedback Information. Defense Technical Information Center, 1986. http://dx.doi.org/10.21236/ada453164.

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Jia, Tao, and Alexandra Duel-Hallen. Improved Channel Allocation for Multicarrier CDMA with Adaptive Frequency Hopping and Multiuser Detection. Defense Technical Information Center, 2008. http://dx.doi.org/10.21236/ada500434.

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