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Capacity of DS/CDMA communication systems with optimum spectral overlap
1998
IEEE Communications Letters
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We consider frequency overlapped DS/CDMA (FO/ CDMA) communication systems where a number of DS/CDMA systems share frequency bands with adjacent systems. ...
The optimum amount of overlap increases with the number of overlapped systems. ...
In this letter, we consider frequency overlapped DS/CDMA (FO/CDMA) communication systems where a number of DS/CDMA systems share their frequency bands with adjacent systems. ...
doi:10.1109/4234.730371
fatcat:uxvu25bojncsndgbqbyqv6un2i
Performance Enhancement of DS-CDMA System for Wireless Local Loop
1999
Journal of Communication and Information Systems
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We give explicit expressions of the capacity to access their performance. ...
In this paper, performance enhancement of Wireless Local Loop (WLL) employing Spatial Division Multiple Access (SDMA) with orthogonal CDMA for the quasi-synchronous reverse link is investigated. ...
We have shown analytically the capacity equation of such CDMAlSDMA system. ...
doi:10.14209/jcis.1999.5
fatcat:flyicb7idfbt7f5ri5cyvgcnli
Achievable Capacity in Hybrid DS-CDMA/OFDM Spectrum-Sharing
2010
IEEE Transactions on Mobile Computing
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Then we present results on the scaling law of the opportunistic spectrum sharing in DS-CDMA/OFDM systems with multiple users. ...
In this paper, we consider DS-CDMA/OFDM spectrum sharing systems and obtain the achievable capacity of the secondary service under different subchannel selection policies in the fading environment. ...
This result presented an scaling law of the opportunistic spectrum sharing in DS-CDMA/OFDM systems with multiple users. ...
doi:10.1109/tmc.2010.15
fatcat:m7dmfehrqjd3dfuh2v3ukngkfi
Adaptive channel reservation scheme for soft handoff in DS-CDMA cellular systems
2001
IEEE Transactions on Vehicular Technology
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To evaluate the performance of the proposed scheme, a Markovian model is developed that considers the interference-limited capacity effect of DS-CDMA systems. ...
Soft handoff techniques in direct-sequence code-division multiple-access (DS-CDMA) systems provide mobile calls with seamless connections between adjacent cells. ...
A Cellular DS-CDMA System Model The link capacity of cellular DS-CDMA systems is determined by interference from users in the same (home) and other cells. ...
doi:10.1109/25.923047
fatcat:qiygvi5vtfgqpjtoiawsmpob7y
Interference Reduction Technique In Multistage Multiuser Detector For Ds-Cdma System
2008
Zenodo
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The simulation has been carried out for asynchronous DS-CDMA system by varying one parameter, i.e., number of users. ...
This paper presents the results related to the interference reduction technique in multistage multiuser detector for asynchronous DS-CDMA system. ...
In DS-CDMA system multiple access interference (MAI) is the major factor limiting the performance and, hence, the capacity of the system. ...
doi:10.5281/zenodo.1076817
fatcat:xqzt3fj7tzbcvmve4fvdb3whyq
A frequency domain approach to design constrained amplitude spreading sequences for DS-CDMA systems for frequency selective fading channels
2005
GLOBECOM '05. IEEE Global Telecommunications Conference, 2005.
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In this paper, we observe that the spectrum of the spreading sequences designed according to existing algorithms are narrowband and are located at the strongest spectral components of the users' channels ...
The narrowbandness of spreading sequences allows to represent each user's sequence with fewer number of parameters and hence reduces the required number of feedback bits to represent those sequences. ...
INTRODUCTION F Or years, the research community has been interested in the design of optimum spreading sequences for DS-CDMA systems. ...
doi:10.1109/glocom.2005.1578396
dblp:conf/globecom/PeirisNM05
fatcat:m55zk4coajbldethn5j6yzamsm
Multi-sensor frequency domain multiple access interference canceller for DS-CDMA systems
2007
Transactions on Emerging Telecommunications Technologies
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Direct Sequence Code Division Multiple Access (DS-CDMA) signals exhibit cyclostationary properties which imply a redundancy between frequency components separated by multiples of the symbol rate. ...
The results are benchmarked against the performance of the conventional RAKE-2D detector, the conventional PIC-2D detector and single user scenario, and we observe considerable performance gains with the ...
To overcome these limitations and therefore enhance the capacity of CDMA systems, joint detection of the received DS-SS signals has been proposed to be used at the base station (BS) or at the user equipment ...
doi:10.1002/ett.1146
fatcat:e6eoi2d66fh33oj2oirg6n4swq
Successive Interference Cancellation Schemes in Multi-Rate DS/CDMA Systems
[chapter]
1996
The Kluwer International Series in Engineering and Computer Science
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Firstly, a successive interference cancellation (IC) scheme for Mlevel rectangular QAM in DS/CDMA systems is analysed. ...
Secondly, the performance under Rayleigh fading is analysed for single modulation systems and different systems for handling multiple data rates. ...
A Direct-Sequence CDMA (DS/CDMA) system has several unique features. ...
doi:10.1007/978-1-4613-1353-3_17
fatcat:pjyxkexolfgo3dorgq6nzgkav4
On the downlink interference in heterogeneous wireless DS-CDMA networks
2006
IEEE Transactions on Wireless Communications
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In this paper, we show that the total downlink interference in heterogeneous wireless DS-CDMA networks follows an asymptotically self-similar (as-s) process. ...
Simulation results for actual cases confirm analytical results, and show that non-uniform spatial distribution of users and their soft-hand-off status do not affect the nature of this self-similar process ...
DS-CDMA systems can also support a heterogeneous mix of services with a broad range of bursty traffic characteristics and QoS requirements. ...
doi:10.1109/twc.2006.1611062
fatcat:jp2djhaaxzdavgpijym6pkvtqi
EVALUATION OF SPECTRAL EFFICIENCY, SYSTEM CAPACITY AND INTERFERENCE EFFECTS ON CDMA COMMUNICATION SYSTEM
2012
International Journal of Advanced Computer Science and Applications
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A very effective solution in achieving network performance in terms of system capacity and spectral efficiency with respect to the CDMA wireless network is presented in this paper. ...
The technology of wireless communications with duplex transmission is one of the fastest expanding in the world today. ...
If the spectral efficiency of the system reaches the optimum level, then SNR can be substituted by:
SNR= (15) www.ijacsa.thesai.org Despite their overlap in time and frequency, the users can be completely ...
doi:10.14569/ijacsa.2012.030605
fatcat:jlinszfn2nd7jljlfvea2zpyaq
DS-CDMA Cellular Systems Performance with Base Station Assignment, Power Control Error and Beamforming over Multipath Fading
2011
International Journal of Computer Networks & Communications
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Also, we present switched-beam (SB) technique in the first stage of the RAKE receiver for enhancing signal to interference plus noise ratio (SINR) in DS- CDMA cellular systems. ...
The interference reduction capability of antenna arrays, base station assignment and the power control algorithms have been considered separately as means to increase the capacity in wireless communication ...
SYSTEM MODEL In this paper, we focus on the uplink communication paths in a DS-CDMA cellular system. ...
doi:10.5121/ijcnc.2011.3112
fatcat:ky3vcin4lbfh5cdkxjyisj6oee
Initial Code Acquisition in the Cooperative Noncoherent MIMO DS-CDMA Downlink
2009
IEEE Transactions on Vehicular Technology
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Index Terms-DS-CDMA, code acquisition, relay station, cooperative, non-coherent MIMO system. ...
In this paper we investigate a realistic code acquisition assisted cooperative Non-Coherent (NC) Multiple-Input Multiple-Output (MIMO) DS-CDMA downlink scenario, when communicating over uncorrelated single-path ...
ACKNOWLEDGEMENT The financial support of the Ministry of Information and Communication (MIC), Republic of Korea, of the EPSRC, UK and of the EU is gratefully acknowledged. ...
doi:10.1109/tvt.2008.929218
fatcat:x4fl3jg2dfbr7m6fjwyhpnnjkm
DS-CDMA system with joint channel estimation and MAP detection in time-selective fading channels
2001
IEEE Journal on Selected Areas in Communications
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In this paper, maximum a posteriori (MAP) detection is applied to a direct-sequence code-division multiple-access (DS-CDMA) system jointly with identification and estimation of time-selective fading channels ...
Through computer simulations, near-optimum bit error rates (BERs) are found. ...
SYSTEM MODEL FOR APERIODIC DS-CDMA The block diagram of the aperiodic DS-CDMA system with an antenna array is shown in Fig. 1(a) . ...
doi:10.1109/49.909614
fatcat:2mf3i7kkf5f2lbgyuwznrwkvqa
On the capacity of CDMA with linear successive interference cancellation
2003
Transactions on Emerging Telecommunications Technologies
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An upper bound on the system capacity as a function of the number of canceled signals is derived. Investigation of the optimum decoding order is also provided in this paper. ...
Limited cancellation can be a good solution for CDMA systems as it provides considerable capacity gain with reduced complexity. ...
Taking into account the respective Quality of Service (QoS) requirements and impact of imperfect interference cancellation, a new power allocation has been derived in [4] for a multi-rate DS-CDMA system ...
doi:10.1002/ett.950
fatcat:2jkph6aeqvhgfelriqyi3r3ody
Reverse Link Performance of DS-CDMA Cellular Systems through Closed-Loop Power Control and Beamforming in 2D Urban Environment
2010
International Journal of Computer Networks & Communications
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Also, we study an analytical approach for the evaluation of the impact of power control error (PCE) on DS-CDMA systems in a 2D urban environment. ...
Finally, we discuss two parameters of the PCE and path-loss exponent and their effects on capacity of the system via some computer. ...
SYSTEM MODEL In this paper, we focus on the uplink communication paths in a DS-CDMA cellular system in a 2D urban environment. ...
doi:10.5121/ijcnc.2010.2610
fatcat:zkxsjkhplzcqfnq4cqbcsdviim
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