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Multiple Access Technologies for Beyond 3G Wireless Cellular Systems
2013
IOSR Journal of Engineering
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This review is followed by a novel formulization of the multiple access schemes through mathematical expressions that could simplify the process of development of new multiple access schemes for B3G wireless ...
In this paper, some fundamental technical concepts of the main multiple access schemes for wireless mobile systems are reviewed, and a path for development of appropriate multiple access technologies for ...
Because MC/DS-CDMA can be explained as a combination of MC-CDMA and DS-CDMA, MC/DS-CDMA achieves very-high-data-rate transmissions with the advantages of both schemes. ...
doi:10.9790/3021-03763745
fatcat:e37lvu2trndg5dudc4px7xxfvq
Multicarrier Spread Spectrum Modulation Schemes and Efficient FFT Algorithms for Cognitive Radio Systems
2014
Electronics
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Multicarrier Spread Spectrum Modulation (MCSSM) schemes like MC-CDMA, MC-DS-CDMA and SS-MC-CDMA, combine DS-CDMA and OFDM techniques in order to improve the CR system performance and adaptability. ...
Direct Sequence Code Division Multiple Access (DS-CDMA) is a spread spectrum technique generally used in underlay CR systems. ...
CI/MC-CDMA In [52] [53] [54] , the use of MC-CDMA with novel carrier interferometry (CI) complex spreading codes was proposed. ...
doi:10.3390/electronics3030419
fatcat:kfhyr3mn3ngrzgpkyxrwr7wxbe
A tutorial on multiple access technologies for beyond 3G mobile networks
2005
IEEE Communications Magazine
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Because MC/DS-CDMA can be explained as a combination of MC-CDMA and DS-CDMA, MC/DS-CDMA achieves very-high-data-rate transmissions with the advantages of both schemes. ...
Of course, MC/DS-CDMA has some disadvantages with respect to DS-CDMA and MC-CDMA. ...
doi:10.1109/mcom.2005.1391509
fatcat:cakaqemqznhubepwvoifzvy3qy
Software-defined-radio-assisted adaptive broadband frequency hopping multicarrier DS-CDMA
2002
IEEE Communications Magazine
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This article presents a versatile broadband multiple access scheme, combining frequency hopping with multicarrier DS-CDMA (FH/MC DS-CDMA). ...
This article also shows that FH/MC DS-CDMA exhibits a high grade of flexibility in the context of system design and parameter reconfiguration. ...
As argued before, FH/MC DS-CDMA systems exhibit a high grade of com- patibility with existing CDMA systems. They benefit from the employment of FH, MC, and DS spreading. ...
doi:10.1109/35.989783
fatcat:bv2tses7sjbk5lh2plvrika4xa
Performance Analysis of MIMO MC-DS/CDMA System Using Chaotic Spreading Sequence
2010
International Journal of Computer and Electrical Engineering
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This paper presents a novel chaotic spreading sequence for multiple input multiple output multi-carrier direct sequence code division multiple access (MIMO MC-DS/CDMA) systems. ...
Index Terms-MC-DS/CDMA, Chaotic code, MIMO, Spreading sequence, MAI ...
A true high-speed multiuser wireless system can only be achieved through an increase in system spectral efficiency, measured in bits per second per Hertz per sector. ...
doi:10.7763/ijcee.2010.v2.156
fatcat:4fhiqkxhszb2dlacfkeg67gxqu
Peak to Average Power Ratio Reduction in Mc Cdma System by Using Pulse Shaping Technique
2013
IOSR Journal of Electronics and Communication Engineering
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In this paper A novel scheme based on pulse shaping described for PAPR reduction. ...
It is shown by computer simulation that the scheme achieves the significant improvement in PAPR reduction in MC CDMA system. ...
However, MC CDMA systems have the inherent problem of a high PAPR, which causes poor power efficiency or serious performance degradation in the transmitted signal. ...
doi:10.9790/2834-0722327
fatcat:cnpvo5ot7bcvhnll3jlj32cuee
Uplink performance of multiband complex wavelet based multicarrier DS-CDMA system in fading channel
2009
2009 International Conference on Wireless Communications & Signal Processing
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On the basis of analyzing the principle of multicarrier DS-CDMA (MC-DS-CDMA), we propose a novel multiband complex wavelet based multicarrier DS-CDMA system in this paper by using the optimized multiband ...
Without any cyclic prefix (CP), the proposed system can avoid the decrease of spectrum efficiency and data rate of conventional MC-DS-CDMA with CP. ...
To search for an efficient multicarrier CDMA scheme, a number of improved multicarrier CDMA systems have been proposed. ...
doi:10.1109/wcsp.2009.5371611
fatcat:7u7tulve55ab5oxoohl22rbyuu
Performance of generalized multicarrier DS-CDMA over Nakagami-m fading channels
2002
IEEE Transactions on Communications
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The resultant BER is compared with that of both multitone DS-CDMA and orthogonal MC DS-CDMA. ...
This generalized MC DS-CDMA scheme includes the subclasses of multitone DS-CDMA and orthogonal MC DS-CDMA as special cases. ...
Hence, the above generalized MC DS-CDMA system model includes a number of specific MC DS-CDMA schemes. ...
doi:10.1109/tcomm.2002.1010615
fatcat:lbi4sljvcreurgcyu3cbmnikga
Comparative Analysis of MC-CDMA System with Wavelet Packet Based MC-CDMA System Using Different Modulation Techniques
2014
IOSR Journal of Electrical and Electronics Engineering
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MC-CDMA is a Multiple access scheme used in Orthogonal Frequency Division Multiplexing (OFDM) based telecommunication systems, allowing the system to support multiple users at the same time. ...
Recently conventional Multi-Carrier Code Division Multiple Access (MC-CDMA) techniques attract more attention of researcher's due to its high frequency spectrum efficiency and high data rate transmission ...
In this scheme, the basic MC-DS-CDMA system is augmented with a pre-coder and a multi-code encoder at the transmitter. ...
doi:10.9790/1676-09351317
fatcat:wnj4uysy5rc2vbcsqjzjsqlcka
Performance Analysis for OFDM-CDMA With Joint Frequency-Time Spreading
2005
IEEE transactions on broadcasting
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In this paper, a novel OFDM-CDMA system with joint time-frequency spreading methods is proposed. ...
Numerical analysis and simulation results indicate that the proposed system outperforms MC-CDMA system. Index Terms-CDMA, maximum ratio combining, multiple access, OFDM. ...
The latter scheme, which is usually called as MC-DS-CDMA, is a good scheme to introduce the OFDM technology into DS-CDMA systems, especially for the quasisynchronous mobile communication environment. ...
doi:10.1109/tbc.2004.839609
fatcat:r2zlveu645hg5hoqx4qtpch2xu
PERFORMANCE OF MULTIBAND COMPLEX WAVELET BASED MULTICARRIER DS-CDMA SYSTEM WITH MULTI-ANTENNA RECEIVER OVER NAKAGAMI-m FADING CHANNEL
2009
Electromagnetic Waves
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On the basis of analyzing the principle of multicarrier DS-CDMA, we propose a novel multiband complex wavelet based multicarrier DS-CDMA system in this paper by using the optimized multiband complex wavelet ...
Without any cyclic prefix (CP), the proposed system can avoid the decrease of spectrum efficiency and data rate of conventional multicarrier DS-CDMA with CP. ...
Furthermore, MBCW-MC-DS-CDMA system with SDC has superior performance; it outperforms RWP-MC-DS-CDMA system with SDC, and is slightly superior to DFT-MC-DS-CDMA system with CP and SDC. ...
doi:10.2528/pier09091202
fatcat:gxtowekvwzecbfbp4i5pr4zr4y
CE-OFDM-CDMA Phase Modulation for 5G System
2021
International journal of mathematical, engineering and management sciences
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In the present work, we propose a novel modulation scheme for 5G wireless communication system. ...
Besides, CE-OFDM-CDMA offers high spectral efficiency with low BER due to its low PAPR. In CE-OFDM-CDMA method, the shape of the spectrum varies according to the value of the modulation index h. ...
Also, the interference between users, ICI, and the noise has a strong effect that weakens the spectral efficiency of MC-CDMA systems (Ahmed, 2019) . ...
doi:10.33889/ijmems.2021.6.4.065
fatcat:goa5y37xbbd77dtztegyqf47xy
A Novel Channel Estimation Technique in MIMO-OFDM Mobile Communication Systems
2020
International journal of new practices in management and engineering
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It can fully support extended multimedia services with High Definition quality, audio and video files. ...
These systems have very high integrity compared to the conventional wireless communication systems. ...
Existing techniques To achieve high spectral efficiency, Filter Bank based Multi carrier system (FBMC) is proposed. It provides high flexibility compared to conventional OFDM systems. ...
doi:10.17762/ijnpme.v9i02.84
fatcat:sef3gghdkbeh5disfxytcl53me
High-reliability and low-complexity resource allocation for future multicarrier spread spectrum systems
2018
Transactions on Emerging Telecommunications Technologies
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In order to find a good trade-off among spectral-efficient, high reliability and low complexity, intelligent dynamic resource allocation is desired by future multicarrier spread spectrum systems. ...
, spectral efficiency and data rate to support high quality and diverse services. ...
Scheme 1: Greedy+RCA
Scheme 2: WSA+RCA
SHSC algorithm
EHSC algorithm
OSC algorithm
F I G U R E 7 Spectral-efficiency performance of the multicell downlink MC DS-CDMA systems employing the proposed ...
doi:10.1002/ett.3457
fatcat:tc2miiah4vfudpjo7t4ddg2qga
Implementable wireless access for B3G networks. III. Complexity reducing transceiver structures [Topics in Radio Communications]
2007
IEEE Communications Magazine
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and Networks & Services for future mobile systems. ...
are available to Industrial Member Companies of Mobile VCE. 1 In addition to the Wireless Access research stream, two other research streams were established which undertook research in Software Based Systems ...
This analysis is complemented in a later section, which deals with multicarrier (MC)-CDMA schemes for B3G wireless systems. ...
doi:10.1109/mcom.2007.344589
fatcat:xjkmrk2t7ncg7ejq3znt2ihkri
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