Results 121 to 130 of about 190 (147)

Blind widely linear multiuser detection

IEEE Communications Letters, 2000
Widely linear structures for multiuser detection of code division multiple-access signals are proposed, which jointly elaborate the received signal and its complex conjugate. Computer simulations show that the new structures significantly outperform the conventional linear ones, in terms of suppression capability of both wideband multiple-access and ...
GELLI, GIACINTO, PAURA, LUIGI, RAGOZINI A. R. P.   +2 more
openaire   +3 more sources

Blind MMSE-Constrained Multiuser Detection

IEEE Transactions on Vehicular Technology, 2008
In this paper, blind multiuser detection is studied for a direct-sequence (DS) code-division multiple access (CDMA) system with unknown multipath channels. The receiver is designed to follow a minimum mean-square-error (MMSE) form parameterized by a channel-like constraint vector, which is then optimized by the conventional constant modulus algorithm ...
null Ping Liu, null Zhengyuan Xu
openaire   +1 more source

Nonlinear group-blind multiuser detection

IEEE Transactions on Communications, 2001
Summary: A nonlinear group-blind technique is developed for joint detection of some given users' data in a CDMA uplink environment with the presence of unknown interference. This method performs the so-called ``slowest-descent search'' over a likelihood function of the desired users, starting from the estimate closest to the unconstrained maximizer of ...
Spasojević, Predrag, Wang, Xiaodong, Høst-Madsen, Anders   +2 more
openaire   +1 more source

Implementing ICA in blind multiuser detection

IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004., 2005
This paper introduces a blind multiuser detection algorithm for MIMO channels. The receiver is required to separate and recover the information signal of the desired user(s) based on independent component analysis (ICA) of the received sequence. The received sequence is assumed to be independent identically distributed.
W.Y. Leong, J. Homer
openaire   +1 more source

Spatio-temporal blind adaptive multiuser detection

IEEE Transactions on Communications, 2000
We propose blind multiuser detection schemes with antenna arrays, which is based on signal subspace estimation. They are a multichannel extension of the decorrelating and minimum mean-square-error detectors, and therefore they share their immunity to near-far effects.
A. Chkeif, K. Abed-Meraim, G. Kawas-Kaleh, null Yingbo Hua   +3 more
openaire   +1 more source

Blind Multiuser Detection Using Adaptive Filter

2009 5th International Conference on Wireless Communications, Networking and Mobile Computing, 2009
A new multi-user detection scheme based on signal subspace estimation is proposed under fading channels in this paper. Different from several Kalman filtering algorithms presented for adaptive multi-user detection, which adapts training data sequences and needs more knowledge about the spreading waveform and delay of the desired user, this paper ...
Yongjian Zhang, Dongyu Wang, Yanshuang Kang, Dacheng Yang   +3 more
openaire   +1 more source

Affine Projection Type Blind Multiuser Detection

2009 IEEE 13th Digital Signal Processing Workshop and 5th IEEE Signal Processing Education Workshop, 2009
We propose an affine projection type multiuser detection for the DS-CDMA (direct sequence code division multiple access) system. This proposed algorithm estimates the desired information symbols using the conventional method based on affine projection algorithm [5], and then modifies the constraints of the conventional method in order to achieve the ...
Nari Tanabe, Toshihiro Furukawa, Shigeo Tsujii   +2 more
openaire   +1 more source

Blind Multiuser Detection Over Highly Dispersive CDMA Channels

IEEE Transactions on Communications, 2004
This paper addresses blind multiuser detection in a direct-sequence code-division multiple-access (DS-CDMA) network in presence of both multiple-access interference and intersymbol interference. In particular, it considers a DS-CDMA system where K out of N users are transmitting; the N admissible spreading codes are known, and so is the code of the ...
BANDIERA, Francesco, RICCI, Giuseppe, M. K. VARANASI   +2 more
openaire   +1 more source

Blind and group-blind multiuser detection in colored noise

WCNC. 1999 IEEE Wireless Communications and Networking Conference (Cat. No.99TH8466), 2003
The problem of adaptive suppression of both multiple-access interference (MAI) and intersymbol interference (ISI) in a dispersive CDMA channel is considered. A subspace-based group-blind technique for this purpose is developed, which blindly suppresses the interfering signals from other cells, while jointly detects the signals within the cell of ...
X. Wang, A. Host-Madsen
openaire   +1 more source

Blind Multiuser Detection by Kurtosis Maximization/Minimization

IEEE Signal Processing Letters, 2004
Blind multiuser detection is studied in the presence of multipath distortion. The kurtosis of the receiver's output is minimized with respect to the receiver's parameters subject to multiple linear constraints. The constraints are dependent on the spreading codes of the user of interest.
Z. Xu, P. Liu
openaire   +1 more source