Delay estimation in long-code asynchronous DS-CDMA systems using multiple antennas
EURASIP Journal on Wireless Communications and Networking - Special issue on innovative signal transmission and detection techniques for next generation cellular CDMA systems
Wireless Personal Communications: An International Journal
A multipath interference cancellation technique for WCDMA downlink receivers: Research Articles
International Journal of Communication Systems
Bounds on Inter-carrier Interference Power of OFDM in a Gaussian Scattering Channel
Wireless Personal Communications: An International Journal
Inter-carrier interference power of OFDM in a uniform scattering channel
Computer Communications
BER of OFDM with diversity and pulse shaping in Rayleigh fading environments
Digital Signal Processing
Orthogonal Frequency Division Multiple Access Fundamentals and Applications
Orthogonal Frequency Division Multiple Access Fundamentals and Applications
Blind multiuser channel estimation in asynchronous CDMA systems
IEEE Transactions on Signal Processing
Asymptotic analysis of blind multiuser detection with blind channel estimation
IEEE Transactions on Signal Processing
Blind multiuser detection: a subspace approach
IEEE Transactions on Information Theory
Blind adaptive multiuser detection
IEEE Transactions on Information Theory
Wireless Personal Communications: An International Journal
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In this paper, a subspace based blind channel estimation scheme for downlink W-CDMA systems using chaotic codes under Weibull and Lognormal fading channel conditions is proposed and compared with W-CDMA system using PN codes. The algorithm provides estimates of multiuser channels by exploiting the structural information of the data output. The subspace of the (data + noise) matrix contains sufficient information for unique determination of channels and, hence, the signature waveforms and signal constellations. The proposed channel estimation algorithm is also implemented for multiuser--orthogonal frequency division multiplexing (OFDM) system. Performance measures like bit error rate (BER) and root mean square error (RMSE) are plotted for Weibull and Lognormal fading channels. Signal constellations under Weibull and Lognormal channels are also plotted. Analytical and Simulation results for BER and RMSE are compared for W-CDMA system using PN codes and chaotic codes. Simulation results show that, chaos-based W-CDMA outperforms the PN-based W-CDMA in terms BER and RMSE. Simulation results of multiuser-OFDM system shows that performance is further improved when compared to the W-CDMA system.