Results 11 - 20 of 357

Vandermonde-Lagrange Mutually Orthogonal Flexible Transceivers for Blind CDMA in Unknown Multipath

by Zhengdao Wang, Anna Scaglione, Georgios B. Giannakis, Sergio Barbarossa , 1999
"... A Mutually-Orthogonal Usercode-Receiver (AMOUR) system was recently proposed to guarantee identifiability of transmitted symbols irrespective of channel nulls in addition to offering deterministic MUI elimination and low complexity transceivers. Motivated by the desire to equip the AMOUR with added ..."
Abstract - Cited by 8 (4 self) - Add to MetaCart
A Mutually-Orthogonal Usercode-Receiver (AMOUR) system was recently proposed to guarantee identifiability of transmitted symbols irrespective of channel nulls in addition to offering deterministic MUI elimination and low complexity transceivers. Motivated by the desire to equip the AMOUR with added

Mutually Orthogonal Transceivers For Blind Uplink CDMA Irrespective Of Multipath Channel Nulls

by Georgios B. Giannakis, Zhengdao Wang, Anna Scaglione, Sergio Barbarossa - in Proc. of Intl. Conf. on ASSP , 1999
"... Suppression of multiuser interference (MUI) and mitigation of multipath effects constitute major challenges in the design of third-generation wireless mobile systems. Most wideband and multicarrier uplink CDMA schemes suppress MUI statistically in the presence of unknown multipath. For fading resist ..."
Abstract - Cited by 7 (6 self) - Add to MetaCart
resistance, they all rely on transmit- or receive-diversity and multichannel equalization based on bandwidth-consuming training or blind techniques. Either way, they impose restrictive and difficult to check conditions on the FIR channel nulls. Relying on symbol blocking, we design A Mutually-Orthogonal

Blind symbol identifiability of orthogonal space-time block codes

by Wing-Kin Ma , P C Ching , T N Davidson , B.-N Vo - in Proc. IEEE International Conference on Acoustic, Speech, and Signal Processing , 2004
"... ABSTRACT This paper addresses the blind symbol identifiability of the orthogonal space-time block code (OSTBC) scheme. That is, the conditions under which OSTBC symbols can be identified without ambiguity when channel state information is not available. In many space-time communication schemes, ach ..."
Abstract - Cited by 3 (0 self) - Add to MetaCart
ABSTRACT This paper addresses the blind symbol identifiability of the orthogonal space-time block code (OSTBC) scheme. That is, the conditions under which OSTBC symbols can be identified without ambiguity when channel state information is not available. In many space-time communication schemes

Fractionally Spaced Mixed Blind Equalization Algorithm Based on Orthogonal Wavelet Transform

by Guo Fu-dong�guo Ye-cai, Ding Xue-jie
"... Abstract—Aiming at huge computation of super-exponential iteration (SEI) algorithm, meanwhile the severe inter-symbol interference (ISI) caused by multi-path fading, in the fractionally spaced blind equalization algorithm which based on superexponential iteration algorithm, fractionally spaced mixed ..."
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mixed blind equalization algorithm which based on orthogonal wavelet transform (FWSW) is proposed. The proposed algorithm uses the fast convergence speed characteristic of SEI algorithm to revise the iteration equation of feedforward weight vectors for decision feedback structure blind equalizer, uses

AN ORTHOGONAL PROJECTION BASED BLIND BEAMFORMER FOR DS-CDMA SYSTEMS

by Jianshu Chen, Jian Wang, Pengyu Zhang, Jian Yuan, Xiuming Shan
"... Conventional blind beamformers in DS-CDMA systems gen-erally suffer from either unreliable convergence rate or sig-nal cancellation in practical signal environment. In this pa-per, we propose a novel orthogonal projection scheme to ex-tract spatial interference structure for the blind beamformer, wh ..."
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Conventional blind beamformers in DS-CDMA systems gen-erally suffer from either unreliable convergence rate or sig-nal cancellation in practical signal environment. In this pa-per, we propose a novel orthogonal projection scheme to ex-tract spatial interference structure for the blind beamformer

An Orthogonal Projection Approach for Blind Beamforming in Multipath CDMA Channels

by Jianshu Chen, Jian Wang, Pengyu Zhang, Jian Yuan, Xiuming Shan
"... In this paper, we propose a blind beamforming technique for multipath CDMA channels, which requires prior knowl-edge of only the spreading code and the timing of the de-sired user. An orthogonal projection approach is used to isolate the interference and estimate its spatial covariance matrix to upd ..."
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In this paper, we propose a blind beamforming technique for multipath CDMA channels, which requires prior knowl-edge of only the spreading code and the timing of the de-sired user. An orthogonal projection approach is used to isolate the interference and estimate its spatial covariance matrix

Subspace-based blind and semi-blind channel estimation for OFDM systems

by Marc De Courville, Pierre Duhamel - IEEE Trans. Signal Process , 2002
"... Abstract—This paper proposes a new blind channel estimation method for orthogonal frequency division multiplexing (OFDM) systems. The algorithm makes use of the redundancy introduced by the cyclic prefix to identify the channel based on a subspace approach. Thus, the proposed method does not require ..."
Abstract - Cited by 56 (2 self) - Add to MetaCart
Abstract—This paper proposes a new blind channel estimation method for orthogonal frequency division multiplexing (OFDM) systems. The algorithm makes use of the redundancy introduced by the cyclic prefix to identify the channel based on a subspace approach. Thus, the proposed method does

A Distributed and Adaptive Signal Processing Approach to Reducing Energy Consumption in Sensor Networks

by Jim Chou, Dragan Petrovic , Kannan Ramchandran - IN PROC. IEEE INFOCOM , 2003
"... We propose a novel approach to reducing energy consumption in sensor networks using a distributed adaptive signal processing framework and efficient algorithm . While the topic of energy-aware routing to alleviate energy consumption in sensor networks has received attention recently [1,2], in thi ..."
Abstract - Cited by 146 (2 self) - Add to MetaCart
,2], in this paper, we propose an orthogonal approach to previous methods. Specifically, we propose a distributed way of continuously exploiting existing correlations in sensor data based on adaptive signal processing and distributed source coding principles. Our approach enables sensor nodes to blindly compress

Blind Source Separation - Semiparametric Statistical Approach

by Shun-Ichi Amari, Jean-francois Cardoso - IEEE Trans. Signal Processing , 1997
"... The semiparametric statistical model is used to formulate the problem of blind source separation. The method of estimating functions is applied to this problem. It is shown that estimation of the mixing matrix or its learning rule version is given by an estimating function. The statistical efficienc ..."
Abstract - Cited by 67 (9 self) - Add to MetaCart
The semiparametric statistical model is used to formulate the problem of blind source separation. The method of estimating functions is applied to this problem. It is shown that estimation of the mixing matrix or its learning rule version is given by an estimating function. The statistical

Interest in Orthogonal Frequency-Division Multiplexing

by Chengyang Li, Sumit Roy
"... Blind MMSE detection for Multi-Carrier CDMA (MC-CDMA) [I J systems in the presence of Intersymbol Interference (IS) channels is addressed. By exploiting the presence of virtual carriers [2], a blind detector architecture-(subspace based) channel estimator followed by a linear MMSE equalizer- is prop ..."
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Blind MMSE detection for Multi-Carrier CDMA (MC-CDMA) [I J systems in the presence of Intersymbol Interference (IS) channels is addressed. By exploiting the presence of virtual carriers [2], a blind detector architecture-(subspace based) channel estimator followed by a linear MMSE equalizer
Results 11 - 20 of 357