Multiuser Detection
Downlink Specific Linear Equalization for Frequency Selective CDMA Cellular Systems
Journal of VLSI Signal Processing Systems
Journal of VLSI Signal Processing Systems
ICASSP '96 Proceedings of the Acoustics, Speech, and Signal Processing, 1996. on Conference Proceedings., 1996 IEEE International Conference - Volume 05
Adaptive blind separation of convolutive mixtures
ICASSP '96 Proceedings of the Acoustics, Speech, and Signal Processing, 1996. on Conference Proceedings., 1996 IEEE International Conference - Volume 05
IEEE Transactions on Signal Processing
Blind channel estimation for long code multiuser CDMA systems
IEEE Transactions on Signal Processing
A matrix-pencil approach to blind separation of colorednonstationary signals
IEEE Transactions on Signal Processing
Blind channel identification and equalization in OFDM-based multiantenna systems
IEEE Transactions on Signal Processing
Blind multiuser channel estimation in asynchronous CDMA systems
IEEE Transactions on Signal Processing
Blind equalization in antenna array CDMA systems
IEEE Transactions on Signal Processing
Reduced-dimension blind space-time 2-D RAKE receivers for DS-CDMAcommunication systems
IEEE Transactions on Signal Processing
Blind decorrelating RAKE receivers for long-code WCDMA
IEEE Transactions on Signal Processing
Blind channel identification and equalization withmodulation-induced cyclostationarity
IEEE Transactions on Signal Processing
Nonminimum-phase FIR channel estimation using cumulant matrix pencils
IEEE Transactions on Signal Processing
Transmitter induced cyclostationarity for blind channelequalization
IEEE Transactions on Signal Processing
Tracking of fast-fading channels in long-code CDMA
IEEE Transactions on Signal Processing
Low-complexity multiuser channel estimation with aperiodicspreading codes
IEEE Transactions on Signal Processing
Linear prediction error method for blind identification of periodically time-varying channels
IEEE Transactions on Signal Processing
Blind adaptive multiuser detection in multipath CDMA channels basedon subspace tracking
IEEE Transactions on Signal Processing
A Toeplitz displacement method for blind multipath estimation forlong code DS/CDMA signals
IEEE Transactions on Signal Processing
Matrix outer-product decomposition method for blind multiplechannel identification
IEEE Transactions on Signal Processing
A multipass approach to joint data and channel estimation in long-code CDMA systems
IEEE Transactions on Wireless Communications
Blind adaptive multiuser detection
IEEE Transactions on Information Theory
IEEE Journal on Selected Areas in Communications
Channel estimation and multiuser detection in long-code DS/CDMA systems
IEEE Journal on Selected Areas in Communications
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We consider blind channel identification and signal separation in long-code CDMA systems. First, by modeling the received signals as cyclostationary processes with modulation-induced cyclostationarity, long-code CDMA system is characterized using a time-invariant system model. Secondly, based on the time-invariant model, multistep linear prediction method is used to reduce the intersymbol interference introduced by multipath propagation, and channel estimation then follows by utilizing the nonconstant modulus precoding technique with or without the matrix-pencil approach. The channel estimation algorithm without the matrix-pencil approach relies on the Fourier transform and requires additional constraint on the code sequences other than being a nonconstant modulus. It is found that by introducing a random linear transform, the matrix-pencil approach can remove (with probability one) the extra constraint on the code sequences. Thirdly, after channel estimation, equalization is carried out using a cyclic Wiener filter. Finally, since chip-level equalization is performed, the proposed approach can readily be extended to multirate cases, either with multicode or variable spreading factor. Simulation results show that compared with the approach using the Fourier transform, the matrix-pencil-based approach can significantly improve the accuracy of channel estimation, therefore the overall system performance.