Spread spectrum communications handbook (revised ed.)
Spread spectrum communications handbook (revised ed.)
Wireless Communications: Principles and Practice
Wireless Communications: Principles and Practice
Wireless Personal Communications: An International Journal
Blind Channel Estimation in Multicode CDMA Using Multiantenna Receiver
Wireless Personal Communications: An International Journal
Wireless Personal Communications: An International Journal
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
Channel Estimation by Using Short Training Sequences in CDMA Systems
Wireless Personal Communications: An International Journal
Blind channel estimation for MC-CDMA systems with long spreading codes
Signal Processing
Wireless Personal Communications: An International Journal
A multipath interference cancellation technique for WCDMA downlink receivers: Research Articles
International Journal of Communication Systems
Subspace methods for the blind identification of multichannel FIRfilters
IEEE Transactions on Signal Processing
Blind multiuser channel estimation in asynchronous CDMA systems
IEEE Transactions on Signal Processing
Blind identification and equalization based on second-order statistics: a time domain approach
IEEE Transactions on Information Theory
Wireless Personal Communications: An International Journal
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This paper presents blind channel estimation for downlink W-CDMA system that employs chaotic codes and Walsh codes for spreading information bits of the multiple users. In a W-CDMA system, while transmitting over multipath channels, both intersymbol interference (ISI) as a result of Inter Chip Interference and multiple access interference (MAI) cannot be easily eliminated. Although it is possible to design multiuser detectors that suppress MAI and ISI, these detectors often require explicit knowledge of at least the desired users' signature waveform. Earlier work focused on a subspace based channel estimation algorithm for asynchronous CDMA systems to estimate the multiple users' symbols, where only AWGN channel was considered. In our work, we study a similar subspace-based signature waveform estimation algorithm for downlink W-CDMA systems, which use chaotic codes instead of pseudo random codes, that provide estimates of the multiuser channel by exploiting structural information of the data output at the base station. In particular, we show that the subspace of the (data+noise) matrix contains sufficient information for unique determination of channels, and hence, the signature waveforms and signal constellation. We consider Rayleigh and Rician fading channel model to quantify the multipath channel effects. Performance measures like bit error rate and root mean square error are plotted for both chaotic codes and Walsh codes under Rayleigh and Rician fading channels.