Efficient VLSI Architectures for Multiuser Channel Estimation in Wireless Base-Station Receivers
Journal of VLSI Signal Processing Systems
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
EURASIP Journal on Applied Signal Processing
A novel approach for multipath channel estimation in CDMA networks using the Unscented Kalman filter
WOCN'09 Proceedings of the Sixth international conference on Wireless and Optical Communications Networks
Sigma point Kalman filters for multipath channel estimation in CDMA networks
ISWCS'09 Proceedings of the 6th international conference on Symposium on Wireless Communication Systems
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Time-delay estimation from low-rate samples: a union of subspaces approach
IEEE Transactions on Signal Processing
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The problem of estimating propagation delays of the transmitted signals in a direct-sequence code-division multiple-access (DS-CDMA) system operating over fading channels is considered. Even though this study is limited to the case when the propagation delays are fixed during the observation interval, the channel gain and phase are allowed to vary in time. Special attention is given to the near-far problem which is catastrophic for the standard acquisition algorithm. An estimator based on subspace identification techniques is proposed, and the Cramer-Rao bound, which serves as an optimality criterion, is derived. The Cramer-Rao bound is shown to be independent of the near-far problem, which implies that there is no fundamental reason for propagation delay estimators to be near-far limited. Furthermore, the proposed algorithm is experimentally shown to be robust against the near-far problem