1,462 Hits in 4.1 sec

A simulation comparison of multiuser receivers for cellular CDMA

R.M. Buehrer, N.S. Correal-Mendoza, B.D. Woerner
2000 IEEE Transactions on Vehicular Technology  
In recent years, multiuser detection has gained significant notoriety as a potential advanced enabling technology for the next generation of CDMA systems.  ...  Finally, we present simulation results for noncoherent architectures of the aforementioned receivers.  ...  This paper presents a comparison of five multiuser receivers and their usefulness for CDMA, particularly at the base station.  ... 
doi:10.1109/25.875213 fatcat:omrwid2wy5fv3bgxixudemnkmu

Link and System Level Performance of Multiuser Detection CDMA Uplink

Antti Toskala, Harri Holma, Seppo Hämäläinen
1998 Wireless personal communications  
The link level performance and the cellular system capacity in the uplink direction of a CDMA cellular system utilising multiuser detection base station receivers is analysed by simulation.  ...  A system level simulator is built to utilise the link level simulation results and to show the increase in cellular capacity obtained by using multiuser detection.  ...  The authors are also grateful for the comments given by Mr. Gerhard Kraemer from ETH Zurich and by Dr. Ian Opperman from the Center for Wireless Communications at the University of Oulu.  ... 
doi:10.1023/b:wire.0000009703.57784.16 fatcat:3jromlvyz5bd5kmvdqbucfntba

Blind adaptive space-time multiuser detection with multiple transmitter and receiver antennas

D. Reynolds, Xiaodong Wang, H.V. Poor
2002 IEEE Transactions on Signal Processing  
The demand for performance and capacity in cellular systems has generated a great deal of interest in the development of advanced signal processing techniques to optimize the use of system resources.  ...  In this paper, we consider space-time multiuser detection using multiple transmit and receive antennas for code-division multiple-access (CDMA) communications.  ...  CDMA or wideband CDMA (WCDMA) is one of the more promising candidates for third-generation (3G) cellular services [1] .  ... 
doi:10.1109/tsp.2002.1003052 fatcat:cb7syu4vczdztp7w27mf7pkuti

Comparison of Several Multiple Antenna Multiuser Detectors in Wireless CDMA Systems

S. Mohammad Razavizadeh, Vahid TabaTaba Vakili, Paeiz Azmi
2003 Mobile and Wireless Communications Networks  
We also compare the performance of various multiuser detection techniques in multiple transmit/receive antennas by computer simulations.  ...  MA A S Sy ys st te em ms s Abstract -Two main problems in CDMA cellular systems are multiple access interference and multipath fading.  ...  III) Simulation Results In this section, we present simulation results, that demonstrate the performance of combined multiuser detection and space-time block coding in a CDMA system.  ... 
doi:10.1142/9789812791146_0056 dblp:conf/mwcn/RazavizadehVA03 fatcat:wxo6opnsjzhq3ipp6nmvfqlfja

Multiuser Detection with Decision-Feedback Detectors and PIC in MC-CDMA System

Leila Sahraoui, Djemil Messadeg, Saliha e Hariz, Noureddine Doghmane
2018 TELKOMNIKA (Telecommunication Computing Electronics and Control)  
In this paper we propose an iterative parallel decision feedback (P-DF) receivers associated with parallel interference cancellation (PIC) for multicarrier code division multiple access (MC-CDMA) systems  ...  In a second time, an iterative proposed method based on the multi-stage techniques P-DFD (parallel DFD with two stages) and PIC was exploited to improve the performance of the system.  ...  Figure 4 .Figure 5 . 45 Performance comparison of different receivers for synchronous MC-CDMA (BER versus SNR, k=16) Performance comparison of different receivers for synchronous MC-CDMA (BER versus SNR  ... 
doi:10.12928/telkomnika.v16i6.9448 fatcat:fgeuso5vgvgexfeiqm3rmzwyqi


Lokesh Tharani, R.P Yadav
2009 International Journal on Intelligent Electronic Systems  
The problem of MAI is vital for a CDMA system. The different types of multiuser detectors are available to mitigate the MAI.  ...  This paper presents the simulation results regarding performance comparison of some most popular non-linear multiuser detectors i.e., multistage detectors, decision-feedback detectors and subtractive interference  ...  CONCLUSION In this paper, we have provided simulation results of three nonlinear multiuser detectors for DS-CDMA systems.  ... 
doi:10.18000/ijies.30035 fatcat:xz2lae3g7fgclfaalflbyrbgwm

On the performance comparison of VSF-OFCDMA and OFDMA

Chia-Chin Chong, Fujio Watanabe, Hiroshi Inamura, Dandan Wang, Hlaing Minn, Naofal Al-Dhahir
2008 2008 IEEE 19th International Symposium on Personal, Indoor and Mobile Radio Communications  
Our simulation results reveal that although the multiuser diversity gain achieved by OFDMA systems can compensate the loss of low frequency reuse at low to mid range of signalto-interference-plus-noise  ...  Since the multiuser diversity gain in OFDMA systems can be achieved by approximately designing its access schemes, while it is non-trivial for the VSF-OFCDMA systems, the effect of both access schemes  ...  On the other hand, code division multiple access (CDMA) is a technology being used in the 3G cellular networks such as 3GPP WCDMA and 3GPP2 CMDA2000.  ... 
doi:10.1109/pimrc.2008.4699446 dblp:conf/pimrc/ChongWIWMA08 fatcat:rbdm62awlbetdnyzjb7jrlwnnm

Optimization of Unequal Power Coded Multiuser DS-CDMA using Extrinsic Information Transfer Charts

David Shepherd, Zhenning Shi, Mark Reed, Frank Schreckenbach
2006 2006 40th Annual Conference on Information Sciences and Systems  
We utilize Extrinsic Information Transfer (EXIT) charts to optimize the power allocation in a multiuser turbocoded CDMA system.  ...  We show through simulation that the optimized power levels allow for successful decoding of heavily loaded systems.  ...  We introduce a flexible scheme for optimizing both capacity and power (to minimize intercell interference) in a multiuser cellular system.  ... 
doi:10.1109/ciss.2006.286690 fatcat:z3a6bmmgnbd53l5t3tgcly7naa

Improved detection in CDMA for biased sources

Hadar Efraim, Nadav Yacov, Ori Shental, Ido Kanter, David Saad
2007 Journal of Physics A: Mathematical and Theoretical  
Analytical results and simulations with excellent agreement are provided, demonstrating substantial improvement in bit error rate in comparison with the unmodified detectors and the alternative of source  ...  Index Terms CDMA, biased sources, multiuser detection, source coding, bias mismatch.  ...  Similar comparison results (Fig. 3-(c) ) are obtained when CDMA demodulation is performed using the nearly-optimal multiuser detector of Kabashima (for β = 0.5 and SNR = 2dB).  ... 
doi:10.1088/1751-8113/40/33/003 fatcat:ottaep4dovct7k4pqdbj7jeo7e

Multicarrier Systems

Hikmet Sari, Arne Svensson, Luc Vandendorpe
2008 EURASIP Journal on Wireless Communications and Networking  
The fourth paper entitled "Optimization of linear precoded OFDM for high data rate UWB systems" by A.  ...  We received 71 highquality submissions, which were peer-reviewed by experts in the field and selected 24 papers for inclusion in this special issue.  ...  Plass considers the cancellation of the intercell interference in cellular MC-CDMA at the receiving end of the downlink, by means of iterative techniques.  ... 
doi:10.1155/2008/598270 fatcat:c24ujqzlizcobmqurtmh6mfd2a

Joint detection and channel estimation algorithms for QS-CDMA signals over time-varying channels

Kyeong Jin Kim, R.A. Iltis
2002 IEEE Transactions on Communications  
We consider a quasi-synchronous code-division multiple access (QS-CDMA) cellular system, where the code delay uncertainty at the base station is limited to a small number of chips.  ...  His research has focused on demodulation and channel estimation algorithms for CDMA and OFDM systems. Ronald A. Iltis (S'83-M'84-SM'91) received the B.A. degree in biophysics from  ...  INTRODUCTION A QUASI-SYNCHRONOUS code-division multiple access (QS-CDMA) cellular system has been previously proposed in [1] - [5] .  ... 
doi:10.1109/tcomm.2002.1006565 fatcat:xzyx3zdqzrfsnppzzh2tkzatga


2011 Journal of Engineering Science and Technology  
A synchronized reception with the code at the receiver is used for despreading the information before data recovery.  ...  From a long period, Walsh codes and Gold codes have been used as spread spectrum codes in Code Division Multiple Access (CDMA) communications because of their ease of generation than the efficiency of  ...  BER performance comparisons Bit error rate (BER) performance is simulated under AWGN noise and Rayleigh flat fading channel for asynchronous and synchronous communication for DS-CDMA.  ... 
doaj:e1404cad03614cdfb4b705b6cb050eca fatcat:vzkcsyptbzgajptqmblmmrknhu

Robust blind multiuser detection against signature waveform mismatch based on second-order cone programming

Shuguang Cui, M. Kisialiou, Zhi-Quan Luo, Zhi Ding
2005 IEEE Transactions on Wireless Communications  
In this paper we consider the design of a blind multiuser CDMA detector that is robust to the SWM. We present a convex formulation for this problem by using the Second Order Cone (SOC) programming.  ...  Blind signal detection in multiuser CDMA system is particularly attractive when only the desired user signature is known to a given receiver.  ...  Acknowledgement: The authors are grateful to Boris Maricić for generating several simulations curves in Section 4.  ... 
doi:10.1109/twc.2005.850330 fatcat:jzdb6qaaafbufl2sjfu6sdmn6y

Performance Analysis of Neural Network Detectors in DS/CDMA Systems

Mahrokh G. Shayesteh, Hamidreza Amindavar
2003 AEU - International Journal of Electronics and Communications  
In this paper, we consider neural networks as the detectors of signals of users in DS/CDMA systems.  ...  Further, we propose modified decision based network which improves the performance of the decision based network. A comparison between multilayer perceptron and Hopfield neural detectors is presented.  ...  In fading channel the rake and single user lower bound receivers are considered for comparison. Since our goal is to improve the performance of BP net, we consider different neural networks.  ... 
doi:10.1078/1434-8411-54100165 fatcat:q34ujdpirreorfhimhf55wvazm

A Low-Complexity Optimum Multiuser Receiver for DS-CDMA Wireless Systems

Syed S Rizvi, Khaled M. Elleithy, Aasia Riasat, Min Song
2010 Journal of Communications  
In this paper, a new scheme for reducing the computational complexity of multiuser receivers is proposed.  ...  In addition to the transformation matrix algorithm, a quantitative analysis of the processing gain for a multiuser DS-CDMA system is presented.  ...  Comparison of BER versus SNR (dB) curves for a synchronous BPSK/DS CDMA system in a Gaussian channel for a small value of K.  ... 
doi:10.4304/jcm.5.6.455-466 fatcat:cgitzblh6jaf7hsflz5xlhtidi
« Previous Showing results 1 — 15 out of 1,462 results