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Journal articles on the topic 'CDMA Optique'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

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1

T, Jaya, M. Monisha, M. Meena, and C. Sharanya. "Improvement of bit error rate performance of MC-CDMA system by using adaptive digital modulation schemes." International Journal of Engineering & Technology 7, no. 3.3 (June 8, 2018): 663. http://dx.doi.org/10.14419/ijet.v7i2.33.14863.

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In Wireless Communication, the transmission channel suffers due to multipath propagation and channel dispersion due to Inter Symbol Interference (ISI), thereby degrades the system performance greatly. Future communication requires high data rate and effective utilization of bandwidth. Hence, there is a need to improve the Bit Error Rate (BER). The proposed work is Adaptive Modulation (AM), combined with Multi Carrier Code Division Multiple Access (MC-CDMA) based transmission system. It is a promising way to increase the data rate and it uses bandwidth in a efficient manner. The Adaptive Modulation based MC-CDMA systems applied to a wide-area environment, can achieve high data rate up to 100Mbps. In this paper M-ary PSK, M-ary QAM and M-ary CPM modulation techniques are used. The Adap-tive modulation based MC-CDMA systems perform well for around 10 number of users. As a whole, the adaptive MC-CDMA system is found to give the optimum BER performance of given digital modulation schemes for fourth generation environment.

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2

AZMI, PAEIZ. "MULTIUSER INTERFERENCE SUPPRESSION TECHNIQUES FOR DIRECT-SEQUENCE CDMA COMMUNICATION SYSTEMS." Fluctuation and Noise Letters 08, no. 03n04 (December 2008): L323—L332. http://dx.doi.org/10.1142/s0219477508005094.

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In this paper, several techniques for multi-user interference suppression from power-controlled direct-sequence CDMA systems are proposed and the emphasis is on the one-shot structure. The proposed schemes arise from the optimum detector that takes into account the existence of power-controlled chip-synchronous multi-user interference and white Gaussian noise. Restricting the multi-user interference to the power-controlled chip-synchronous case strongly reduces the complexity of the optimum detector. For more reduction in the complexity, some approximations of the obtained techniques are also considered. It is shown that in asynchronous CDMA systems and in the presence of white Gaussian noise, the proposed detectors outperform the correlator with comparable complexity

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3

Bernstein, X., and A. M. Haimovich. "Space-time optimum combining for CDMA communications." Wireless Personal Communications 3, no. 1-2 (1996): 73–89. http://dx.doi.org/10.1007/bf00333924.

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4

N. Motade, Sumitra, and Anju V. Kulkarni. "Incremental gradient algorithm for multiuser detection in multi-carrier DS-CDMA system under modulation schemes." International Journal of Engineering & Technology 7, no. 2.6 (March 11, 2018): 311. http://dx.doi.org/10.14419/ijet.v7i2.6.11270.

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Nowadays, Multicarrier Direct sequence code division multiple access (MC DS-CDMA) systems are used in mobile communication. Performance of these systems are limited by multiple access interference (MAI) created by spread-spectrum users in the channel as well as background channel noise. This paper proposes an incremental gradient descent (IGD) multi-user detection (MUD) for MC DS-CDMA system that can achieve near-optimum performance while the number of users is linear in its implementation complexity. The IGD algorithm make an effort to perform optimum MUD by updating one user's bit decision each iteration in the best way. This algorithm accelerates the gradient algorithm convergence by averaging. When a minimum mean square error (MMSE) MUD is employed to initialize the proposed algorithm, in all cases tested the gradient search converges to a solution with optimum performance. Further, the iterative tests denote that the proposed IGD algorithm provides significant performance for cases where other suboptimum algorithms perform poorly. Simulation compares the proposed IGD algorithm with the conventional detectors.

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5

Mooranian, Armin, Thomas Foster, Corina M. Ionescu, Daniel Walker, Melissa Jones, Susbin Raj Wagle, Bozica Kovacevic, et al. "Enhanced Bilosomal Properties Resulted in Optimum Pharmacological Effects by Increased Acidification Pathways." Pharmaceutics 13, no. 8 (July 31, 2021): 1184. http://dx.doi.org/10.3390/pharmaceutics13081184.

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Introduction: Recent studies in our laboratory have shown that some bile acids, such as chenodeoxycholic acid (CDCA), can exert cellular protective effects when encapsulated with viable β-cells via anti-inflammatory and anti-oxidative stress mechanisms. However, to explore their full potential, formulating such bile acids (that are intrinsically lipophilic) can be challenging, particularly if larger doses are required for optimal pharmacological effects. One promising approach is the development of nano gels. Accordingly, this study aimed to examine biological effects of various concentrations of CDCA using various solubilising nano gel systems on encapsulated β-cells. Methods: Using our established cellular encapsulation system, the Ionic Gelation Vibrational Jet Flow technology, a wide range of CDCA β-cell capsules were produced and examined for morphological, biological, and inflammatory profiles. Results and Conclusion: Capsules’ morphology and topographic characteristics remained similar, regardless of CDCA or nano gel concentrations. The best pharmacological, anti-inflammatory, and cellular respiration, metabolism, and energy production effects were observed at high CDCA and nano gel concentrations, suggesting dose-dependent cellular protective and positive effects of CDCA when incorporated with high loading nano gel.

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6

Verdu, S., and D. N. C. Tse. "Optimum asymptotic multiuser efficiency of randomly spread CDMA." IEEE Transactions on Information Theory 46, no. 7 (2000): 2718–22. http://dx.doi.org/10.1109/18.887887.

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7

Lei Wei and R. Jana. "Performance bounds for optimum multiuser DS-CDMA systems." IEEE Transactions on Communications 47, no. 2 (1999): 185–90. http://dx.doi.org/10.1109/26.752122.

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8

Kumar, Arun, and Dr Manisha Gupta. "COMPARATIVE STUDY AND ANALYSIS OF BER OF CDMA FOR DIFFERENT MODULATION SCHEME." INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY 12, no. 8 (March 4, 2014): 3839–43. http://dx.doi.org/10.24297/ijct.v12i8.3013.

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With the increasing demand in wireless communication, it has become necessary to give better and efficient service to users by using better technique. This paper propose and analyse the bit error rate of CDMA, for different modulation schemes such as BPSK, QPSK and QAM. By Choosing a reliable modulation scheme and better filtration Technique the enhancement of the performance can be obtained in transmitter and receiver of CDMA system. Simulated result is shown to analyse and compare the performance of these systems by using additive white Gaussian noise channel (AWGN).Finally the different modulation schemes is compared on the basis of BER and best modulation scheme is determined. Â From analysis of three modulation techniques, the system could use more appropriate modulation technique to suit the channel quality, thus we can deliver the optimum and efficient data rate to mobile terminal.

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9

Sedaghat, Mohammad Ali, Ralf R. Muller, and Farokh Marvasti. "On Optimum Asymptotic Multiuser Efficiency of Randomly Spread CDMA." IEEE Transactions on Information Theory 61, no. 12 (December 2015): 6635–42. http://dx.doi.org/10.1109/tit.2015.2482483.

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10

Kaya, O., and S. Ulukus. "Ergodic Sum Capacity Maximization for CDMA: Optimum Resource Allocation." IEEE Transactions on Information Theory 51, no. 5 (May 2005): 1831–36. http://dx.doi.org/10.1109/tit.2005.846413.

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11

GU, Fang-lin, Hang ZHANG, and Zhi-fu CUI. "Optimum up-link power control in CDMA satellite communication system." Journal of Computer Applications 30, no. 9 (November 30, 2010): 2512–14. http://dx.doi.org/10.3724/sp.j.1087.2010.02512.

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12

Jin Hee Han and Sang Wu Kim. "Capacity of DS/CDMA communication systems with optimum spectral overlap." IEEE Communications Letters 2, no. 11 (November 1998): 298–300. http://dx.doi.org/10.1109/4234.730371.

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13

Perez-Romero, Jordi, Oriol Sallent, and Ramon Agusti. "On the Optimum Traffic Allocation in Heterogeneous CDMA/TDMA Networks." IEEE Transactions on Wireless Communications 6, no. 9 (September 2007): 3170–74. http://dx.doi.org/10.1109/twc.2007.06030032.

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14

Chaufray, J. M., W. Hachem, and P. Loubaton. "Asymptotic Analysis of Optimum and Suboptimum CDMA Downlink MMSE Receivers." IEEE Transactions on Information Theory 50, no. 11 (November 2004): 2620–38. http://dx.doi.org/10.1109/tit.2004.836929.

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15

Pawelec, J�zef J., and Rafa? Piotrowski. "Optimum filtration of NB interference in DS-CDMA satellite systems." International Journal of Satellite Communications and Networking 21, no. 1 (January 2003): 119–25. http://dx.doi.org/10.1002/sat.748.

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16

Kawahara, T., and T. Matsumoto. "Optimum rate Reed Solomon codes for FFH/CDMA mobile radios." Electronics Letters 27, no. 22 (1991): 2066. http://dx.doi.org/10.1049/el:19911281.

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17

SHUEH, F., and W. ERICCHEN. "Optimum OVSF code reassignment in Wideband CDMA forward radio link." Information Sciences 174, no. 1-2 (June 28, 2005): 81–101. http://dx.doi.org/10.1016/j.ins.2004.08.001.

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18

Choi, Kwonhue, and Sooyoung Kim. "Optimum Uplink Power/Rate Control for Minimum Delay in CDMA Networks." ETRI Journal 25, no. 6 (December 3, 2003): 437–44. http://dx.doi.org/10.4218/etrij.03.0103.0001.

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19

Kwon, S. K., H. G. Jeon, and K. R. Cho. "Optimum reserved resource allocation scheme for handoff in CDMA cellular system." Journal of Systems Architecture 46, no. 2 (January 2000): 131–44. http://dx.doi.org/10.1016/s1383-7621(98)00075-7.

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20

Ulukus, S., and R. D. Yates. "Iterative construction of optimum signature sequence sets in synchronous CDMA systems." IEEE Transactions on Information Theory 47, no. 5 (July 2001): 1989–98. http://dx.doi.org/10.1109/18.930932.

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21

CHOUDHRY, M. A. S., M. ZUBAIR, A. NAVEED, and I. M. QURESHI. "Near Optimum Detector for DS-CDMA System Using Particle Swarm Optimization." IEICE Transactions on Communications E90-B, no. 11 (November 1, 2007): 3278–82. http://dx.doi.org/10.1093/ietcom/e90-b.11.3278.

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22

Xiaodong Yue and H. H. Fan. "Near-far resistance of optimum and suboptimum CDMA detectors under multipath." IEEE Transactions on Signal Processing 53, no. 8 (August 2005): 2898–917. http://dx.doi.org/10.1109/tsp.2005.850367.

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23

Qingchong Liu, R. A. Scholtz, and Zhen Zhang. "Complexity of Verdu optimum multiuser detection algorithm in multichannel CDMA systems." IEEE Transactions on Communications 47, no. 12 (1999): 1913–20. http://dx.doi.org/10.1109/26.809712.

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24

Kaya, O., and S. Ulukus. "Optimum Power Control for CDMA With Deterministic Sequences in Fading Channels." IEEE Transactions on Information Theory 50, no. 10 (October 2004): 2449–58. http://dx.doi.org/10.1109/tit.2004.834747.

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25

Qiang Wu. "Performance of optimum transmitter power control in CDMA cellular mobile systems." IEEE Transactions on Vehicular Technology 48, no. 2 (March 1999): 571–75. http://dx.doi.org/10.1109/25.752582.

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26

Nguyen, H. H., and W. A. C. Fernando. "Optimum linear decoding of vector quantisation transmitted over a CDMA channel." IET Communications 1, no. 6 (2007): 1206. http://dx.doi.org/10.1049/iet-com:20060071.

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27

Alagöz, Fatih. "A New Algorithm for Optimum Multiuser Detection in Synchronous CDMA Systems." AEU - International Journal of Electronics and Communications 57, no. 4 (January 2003): 263–69. http://dx.doi.org/10.1078/1434-8411-54100169.

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28

Al-Jazzar, Saleh O., Ahmad Al-Nimrat, and Mahmoud Smadi. "Delay estimation enhancement in CDMA systems using optimum training bits’ power." AEU - International Journal of Electronics and Communications 66, no. 3 (March 2012): 244–48. http://dx.doi.org/10.1016/j.aeue.2011.07.008.

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29

Shukla, M., and Ruchir Gupta. "Performance Analysis of Optimum Interleaver based on Prime Numbers for Multiuser Iterative IDMA Systems." International Journal of Interdisciplinary Telecommunications and Networking 2, no. 3 (July 2010): 51–65. http://dx.doi.org/10.4018/jitn.2010070103.

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In recently proposed multiple access techniques like IDMA and OFDM-IDMA, the user separation is done by user specific interleavers in contrast to the conventional CDMA scheme, where user separation is assured with user-specific signature sequences. The user specific interleavers must demonstrate minimum probability of collision amongst each other in addition to other merits, including minimal consumption of bandwidth, least hardware for their generation, and least memory requirement. In this paper, the authors propose an interleaver based on prime numbers for the generation of user specific interleavers to remove the problem of high consumption of bandwidth. The simulation results demonstrate the optimal performance of prime interleaver (PI), which is based on prime numbers, apart from other merits in comparison to random and other interleavers.

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30

Ulukus, S., and R. D. Yates. "Optimum multiuser detection is tractable for synchronous CDMA systems using m-sequences." IEEE Communications Letters 2, no. 4 (April 1998): 89–91. http://dx.doi.org/10.1109/4234.664214.

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31

Il-Min Kim and Hyung-Myung Kim. "An optimum power management scheme for wireless video service in CDMA systems." IEEE Transactions on Wireless Communications 2, no. 1 (January 2003): 81–91. http://dx.doi.org/10.1109/twc.2002.806367.

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32

Khan, S. A., and J. Bajcsy. "Chip-Asynchronous Binary Optical CDMA: An Optimum Signaling Scheme for Random Delays." IEEE Photonics Journal 5, no. 2 (April 2013): 7200408. http://dx.doi.org/10.1109/jphot.2013.2255033.

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33

Il-Min Kim, Hyung-Myung Kim, and Dong Seung Kwon. "Optimum rate allocation for two-class services in CDMA smart antenna systems." IEEE Transactions on Communications 51, no. 5 (May 2003): 810–16. http://dx.doi.org/10.1109/tcomm.2003.811413.

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34

Mashhadi, Saeed, and Jawad Salehi. "Optimum code structures for positive optical CDMA using normalized divergence maximization criterion." IEEE Transactions on Communications 56, no. 9 (September 2008): 1414–21. http://dx.doi.org/10.1109/tcomm.2008.060284.

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35

Tung, Tai-Lai, and Kung Yao. "Optimum Downlink Power Control of a DS-CDMA System via Convex Programming." Journal of VLSI Signal Processing-Systems for Signal, Image, and Video Technology 39, no. 1/2 (January 2005): 133–46. http://dx.doi.org/10.1023/b:vlsi.0000047276.31162.64.

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36

Khalid, Arslan, Hafiz Muhammad Asif, Konstantin I. Kostromitin, Sattam Al-Otaibi, Kazi Mohammed Saidul Huq, and Jonathan Rodriguez. "Doubly Orthogonal Wavelet Packets for Multi-Users Indoor Visible Light Communication Systems." Photonics 6, no. 3 (July 30, 2019): 85. http://dx.doi.org/10.3390/photonics6030085.

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Visible Light Communication (VLC) is a data communication technology that modulates the intensity of the light to transmit the information mostly by means of Light Emitting Diodes (LEDs). The data rate is mainly throttled by the limited bandwidth of the LEDs. To combat, Multi-carrier Code Division Multiple Access (MC-CDMA) is a favorable technique for achieving higher data rates along with reduced Inter-Symbol Interference (ISI) and easy access to multi-users at the cost of slightly reduced compromised spectral efficiency and Multiple Access Interference (MAI). In this article, a multi-user VLC system is designed using a Discrete Wavelet Transform (DWT) that eradicates the use of cyclic prefix due to the good orthogonality and time-frequency localization properties of wavelets. Moreover, the design also comprises suitable signature codes, which are generated by employing double orthogonality depending upon Walsh codes and Wavelet Packets. The proposed multi-user system is simulated in MATLAB software and its overall performance is assessed using line-of-sight (LoS) and non-line-of-sight (NLoS) configurations. Furthermore, two sub-optimum multi-users detection schemes such as zero forcing (ZF) and minimum-mean-square-error (MMSE) are also used at the receiver. The simulated results illustrate that the doubly orthogonal signature waveform-based DWT-MC-CDMA with MMSE detection scheme outperforms the Walsh code-based multi-user system.

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37

ZAKA, IMRAN, HABIB UR REHMAN, SYED ISMAIL SHAH, and JAMIL AHMAD. "PSO- AND GA-BASED NARROWBAND JAMMER EXCISION IN CDMA." Journal of Circuits, Systems and Computers 19, no. 01 (February 2010): 123–38. http://dx.doi.org/10.1142/s0218126610005949.

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Narrowband jammer excision is formulated as an optimization problem in this paper. Optimal filter weights are calculated/searched for by the computational intelligence techniques. We compare the error rate performance, complexity, and implementation issues of various computational intelligence techniques like Particle Swarm Optimization (PSO), Genetic Algorithm, and Least Mean Square (LMS). These techniques update the excision filter weights iteratively till the convergence criteria has been achieved. Bit Error Rate performance shows these techniques effectively suppress the Narrow Band Interference. It has been observed that PSO-based algorithm with tuned parameters outperforms other schemes of PSO and the other algorithms. It approaches the optimum performance in fewer iterations with ease in implementation.

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38

Benvenuto, Nevio, Paola Bisaglia, and Federico Boccardi. "Joint Optimum Linear Precoding and Power Control Strategies for Downlink MC-CDMA Systems." IEEE Transactions on Communications 56, no. 5 (May 2008): 769–77. http://dx.doi.org/10.1109/tcomm.2008.050153.

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39

Vasudevan, S., and M. K. Varanasi. "Optimum diversity combiner based multiuser detection for time-dispersive Rician fading CDMA channels." IEEE Journal on Selected Areas in Communications 12, no. 4 (May 1994): 580–92. http://dx.doi.org/10.1109/49.286665.

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40

Sun, Yi, and Jizhong Xiao. "Multicode Sparse-Sequence CDMA: Approach to Optimum Performance by Linearly Complex WSLAS Detectors." Wireless Personal Communications 71, no. 2 (September 30, 2012): 1049–56. http://dx.doi.org/10.1007/s11277-012-0859-0.

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41

SHIN, SEUNG HOON, and KYUNG SUP KWAK. "EFFECTIVE ADMISSION CONTROL FOR POWER-CONTROLLED DS-CDMA SYSTEMS." Journal of Circuits, Systems and Computers 13, no. 02 (April 2004): 325–39. http://dx.doi.org/10.1142/s0218126604001349.

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Effective call admission control (CAC) is one of the most important techniques to provide the desired quality of service (QoS) in wireless networks. This paper investigates the call admission control problem for the power-controlled CDMA systems. With a macroscopic description for the power control problem, the call admission control for the power-constrained system is analyzed and an admissibility condition is derived. Based on the derived condition, we propose two CAC algorithms. One is an interactive method that provides the optimum performance, but requires some information exchange between base stations. The other can be implemented in a distributed manner and provide a reasonable performance. Through simulations, we show that the proposed algorithms provide an improved performance.

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42

CHOI, Kwonhue, and Jiyu JIN. "Optimum and Suboptimum Code Allocation for Peak Power Reduction in Down-Link MC CDMA." IEICE Transactions on Communications E92-B, no. 11 (2009): 3389–93. http://dx.doi.org/10.1587/transcom.e92.b.3389.

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43

Kim, D. I. "Optimum Packet Data Transmission in Cellular Multirate CDMA Systems With Rate-Based Slot Allocation." IEEE Transactions on Wireless Communications 3, no. 1 (January 2004): 165–75. http://dx.doi.org/10.1109/twc.2003.821160.

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44

Jiangxin Chen and U. Mitra. "Optimum near-far resistance for dual-rate DS/CDMA signals: random signature sequence analysis." IEEE Transactions on Information Theory 45, no. 7 (1999): 2434–47. http://dx.doi.org/10.1109/18.796382.

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45

Pangan Ting, Chao-Kai Wen, Jung-Chieh Chen, and Jiunn-Tsair Chen. "BER analysis of the optimum multiuser detection with channel mismatch in MC-CDMA systems." IEEE Journal on Selected Areas in Communications 24, no. 6 (June 2006): 1221–35. http://dx.doi.org/10.1109/jsac.2005.864009.

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46

Ulukus, S., and R. D. Yates. "User Capacity of Asynchronous CDMA Systems With Matched Filter Receivers and Optimum Signature Sequences." IEEE Transactions on Information Theory 50, no. 5 (May 2004): 903–9. http://dx.doi.org/10.1109/tit.2004.826694.

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47

Öztürk, Ertan, O??uz Kucur, and Guillermo E. Atkin. "Performance of optimum wavelet waveform for DS-CDMA chip waveform over QS-AWGN channel." International Journal of Communication Systems 19, no. 1 (2006): 1–16. http://dx.doi.org/10.1002/dac.737.

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48

Navaie, Keivan, Shahrokh Valaee, Ahmad Sharafat, and Elvino Sousa. "Optimum Model-Based Non-Real-Time Downlink Data Transmission in Heterogeneous DS-CDMA Cellular Networks." IEEE Transactions on Wireless Communications 6, no. 6 (June 2007): 2357–67. http://dx.doi.org/10.1109/lcomm.2007.05877.

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49

Öztürk, Ertan, and Barış Şahin. "Performance of optimum wavelet for DS-CDMA chip waveform over multi-path Rayleigh fading channels." International Journal of Communication Systems 20, no. 9 (2007): 1081–95. http://dx.doi.org/10.1002/dac.863.

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50

Feng-Tsun Chien, Chien-Hwa Hwang, and C. C. J. Kuo. "Performance analysis of multicarrier CDMA systems with frequency offsets and random spreading under optimum combining." IEEE Transactions on Communications 54, no. 4 (April 2006): 737–47. http://dx.doi.org/10.1109/tcomm.2006.873094.

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