Filters








587 Hits in 4.9 sec

Blind adaptive multiuser detection based on Kalman filtering

Xian-Da Zhang, Wei Wei
2002 IEEE Transactions on Signal Processing  
Fig. 2 . 2 Time-averaged SIR versus time for 500 runs when using the three algorithms to an asynchronous CDMA system with processing gain N = 31.1) Convergence Rate Comparison:In Example 1, DS-CDMA systems  ...  Fig. 1 . 1 Time-averaged SIR versus time for 500 runs when using the three algorithms to a synchronous CDMA system with processing gain N = 31.  ... 
doi:10.1109/78.972485 fatcat:zda4g73kkfc4zoytyfmhqzvm5i

Constrained Tensor Modeling Approach to Blind Multiple-Antenna CDMA Schemes

AndrÉ L. F. de Almeida, GÉrard Favier, JoÃo Cesar M. Mota
2008 IEEE Transactions on Signal Processing  
In this paper, we consider an uplink multiple-antenna code-division multiple-access (CDMA) system linking several multiple-antenna mobile users to one multiple-antenna base station.  ...  They can be viewed as canonical allocation matrices that define the allocation of users' data streams and spreading codes to the transmit antennas.  ...  A space-time receiver for block-spread multiple-antenna CDMA is proposed in [5] .  ... 
doi:10.1109/tsp.2008.917028 fatcat:m5rjmjgszvgdrkjdord7rfzvpa

Subspace multiuser detection for multicarrier DS-CDMA

J.S. Lehnert, T.F. Wong, J. Namgoong
2000 IEEE Transactions on Communications  
Typically, a MC-DS-CDMA system employs a band-limited chip waveform.  ...  A subspace-based linear minimum mean-squared error (MMSE) multiuser detection scheme is proposed for a multicarrier direct-sequence code-division multiple-access (MC-DS-CDMA) system.  ...  This is used in Section VI to derive the channel estimation error.  ... 
doi:10.1109/26.886487 fatcat:thvascvawjbt3nautunzvdmpkq

PERFORMANCE COMPARISON OF BLIND ADAPTIVE MULTIUSER DETECTION ALGORITHMS

Khalifa Hunki .
2013 International Journal of Research in Engineering and Technology  
Four kinds of blind multiuser detection algorithms applied to code-division multiple-access (CDMA) communication system are studied in this paper.  ...  Subspace-based Kalman filter algorithm has faster convergence speed, more practical and the capability of CDMA system can be increased.  ...  CDMA system with processing gain N = 31.  ... 
doi:10.15623/ijret.2013.0211067 fatcat:u65o2rmbwjffhauxg7ywiofrsa

Precombining Adaptive Lmmse Detection For Ds-Cdma Systems In Time Varying Channels: Non Blind And Blind Approaches

M. D. Kokate, T. R. Sontakke, P. W. Wani
2007 Zenodo  
This paper deals with an adaptive multiuser detector for direct sequence code division multiple-access (DS-CDMA) systems.  ...  MOE criterion together with canonical representation of the detector results in a constrained optimization problem.  ...  SYSTEM MODEL A general DS-CDMA system with K users and L discrete mutlipath components transmitting at same time is considered.  ... 
doi:10.5281/zenodo.1075900 fatcat:pn5cujodjvdffnjj3haasjfkp4

BAMUD Features Demonstration by System View

D. Kocur, S. Marchevsky, L. Longauer
2004 Radioengineering  
Direct-sequence code-division multiple access (DS-CDMA) is afrequently used wireless technology in DS-CDMA communications.  ...  The structure of adaptive blinddetector is simulated by the system design tool SystemView.  ...  Canonical representation of space-time signals which blind detector operate with and minimum output energy (MOE) concept are mentioned in order to gain blind detection realization scheme.  ... 
doaj:b8930c09db804b50b094fd86ab561877 fatcat:xr3vpu2bkbf7phklyanfc7gtyq

Constrained Space-Time Spreading For Mimo-Cdma Systems: Tensor Modeling And Blind Detection

André de Almeida, Gerard Favier, Joao Mota
2007 Zenodo  
Publication in the conference proceedings of EUSIPCO, Poznan, Poland, 2007  ...  CONCLUSION In this paper, we have presented a constrained space-time spreading (CSTS) framework for MIMO-CDMA systems relying on a tensor modeling of the space-time spreading process.  ...  We can distinguish the following types of transmit schemes that are covered by our constrained space-time spreading model: [2]); CONSTRAINED SPACE-TIME SPREADING In this section, Constrained Space-Time  ... 
doi:10.5281/zenodo.40655 fatcat:xyx6bq3wxzcfba54tizp6h3kl4

Decentralized multiuser detection for time-varying multipath channels

A.M. Sayeed, T.A. Kadous
2000 IEEE Transactions on Communications  
While multipath effects are exploited in existing CDMA systems to combat fading, they are often considered a nuisance to MAI suppression.  ...  Multiple-access interference (MAI) and time-varying multipath effects are the two most significant factors limiting the performance of code-division multiple-access (CDMA) systems.  ...  Innovative signal processing is playing a key role in the design of high-performance CDMA receivers.  ... 
doi:10.1109/26.886474 fatcat:x33tv2ps3vadfigyzhxvgdf3qm

An Integrated Framework for MC-CDMA Reception in the Presence of Frequency Offsets, Phase Noise, and Fast Fading

T.A. Kadous, A.M. Sayeed
2004 IEEE Transactions on Wireless Communications  
We consider a single-user communication system and use a canonical model for the received signal that efficiently captures the effects of all impairments.  ...  Due to the longer symbol duration in comparison with single-carrier systems, MC systems are more sensitive to various imperfections, including phase noise and frequency offsets due to local oscillators  ...  MC-CDMA also requires a lower-speed parallel-type processing compared to fast serial-type processing in a SC-CDMA system.  ... 
doi:10.1109/twc.2004.830828 fatcat:hoc32f4w4fc6jnzmygyouo64gm

Semidefinite positive relaxation of the maximum-likelihood criterion applied to multiuser detection in a CDMA context

M. Abdi, H. El Nahas, A. Jard, E. Moulines
2002 IEEE Signal Processing Letters  
Very encouraging results are obtained to solve even large-scale combinatorial optimization programs, as the one arising in multiuser detection for code division multiple access (CDMA) systems.  ...  Many signal processing applications reduce to solving combinatorial optimization problems.  ...  arise in space-time transmission schemes, demodulation over fading channels, etc.  ... 
doi:10.1109/lsp.2002.800508 fatcat:kuhgjeag4rfgfpazqxwsdm34ou

Adaptive step-size algorithms for blind interference suppression in DS/CDMA systems

V. Krishnamurthy, G. Yin, S. Singh
2001 IEEE Transactions on Signal Processing  
DS/CDMA systems.  ...  dynamic environments where the number of interferers are time-varying.  ...  As defined in [6] , the SIR at time is given by 2) The simulations below assume a synchronous DS/CDMA-system with processing gain .  ... 
doi:10.1109/78.890361 fatcat:fecfylhcsffwzglfvz4gg3kc3e

BLIND PARALIND MULTIUSER DETECTION FOR SMART ANTENNA CDMA SYSTEM OVER MULTIPATH FADING CHANNEL

Xiaofei Zhang, Xin Gao, Ziqing Wang
2009 Electromagnetic Waves  
performance is very close to nonblind space-time minimum mean square error (ST-MMSE) method.  ...  This paper links the multipath smart antenna CDMA system signal detection problem to the PARAllel profiles with LINear Dependencies (PARALIND), and derives a deterministic blind PARALIND algorithm whose  ...  A novel blind space-time multiuser detection algorithm for smart antenna CDMA system over multipath fading channel is investigated in this paper.  ... 
doi:10.2528/pier08112903 fatcat:oxjtgsg6h5bt7g2ph2enisurf4

Performance of MIMO MC-CDMA for STBC Communication System Using OKHA Based Optimal Channel Estimation

Sreesudha Parnapalli, Barooru Malleswari
2017 International Journal of Intelligent Engineering and Systems  
The key component of MIMO MC-CDMA is the capacity of abusing diversity jointly in time, frequency and in the space domain.  ...  The multiuser MC-CDMA system using Alamouti's Space-Time Block coding for encoding the transmitting sequence. The estimation of Channel State Information (CSI) is optimally selected using OKHA.  ...  The overall transmission process of proposed STBC MC-CDMA system is shown in figure 1.  ... 
doi:10.22266/ijies2017.0831.01 fatcat:rls7r36rm5djxjs6563df5xfyq

Canonical space-time processing for wireless communications

E.N. Onggosanusi, A.M. Sayeed, B.D. Van Veen
2000 IEEE Transactions on Communications  
A canonical space-time characterization of mobile wireless channels is introduced in terms of a fixed basis that is independent of the true channel parameters.  ...  It is demonstrated that the resulting canonical space-time receivers deliver near-optimal performance at substantially reduced complexity compared to existing designs.  ...  INTRODUCTION T HE USE of antenna arrays for enhancing the capacity and quality of wireless communication systems has spurred significant interest in space-time signal processing techniques [1] .  ... 
doi:10.1109/26.871392 fatcat:auoleczp7bgsrj4gguca7uebei

A Linear Chip-Level Model For Multi-Antenna Space-Time Coded Wideband Cdma Reconfigurable Receivers

Giovanni Garbo, Stefano Mangione, Vincenzo Maniscalco
2006 Zenodo  
Publication in the conference proceedings of EUSIPCO, Florence, Italy, 2006  ...  Space-Time Block Codes A generic Space-Time Block Code is a map from P ℂ to QM ℂ , where P is the number of input symbols in a code block, Q is the number of time samples in a block and M in the number  ...  Block Coded W-CDMA model To derive a model for the received signal of space-time block coded W-CDMA it suffices to link ( ) , m k x ξ and ( ) ( ) φ F d .  ... 
doi:10.5281/zenodo.52769 fatcat:ivzzsw4le5d4jhjxxkdrzpewnm
« Previous Showing results 1 — 15 out of 587 results