Wireless Communications: Principles and Practice
Wireless Communications: Principles and Practice
Spread Spectrum CDMA Systems for Wireless Communications
Spread Spectrum CDMA Systems for Wireless Communications
An overview of the challenges and progress in meeting the E-911 requirement for location service
IEEE Communications Magazine
EURASIP Journal on Applied Signal Processing
A random perturbation-based scheme for pairwise key establishment in sensor networks
Proceedings of the 8th ACM international symposium on Mobile ad hoc networking and computing
EURASIP Journal on Advances in Signal Processing
Identification of LOS in time-varying, frequency selective radio channels
EURASIP Journal on Wireless Communications and Networking
R-factor: a new parameter to enhance location accuracy in RSSI based real-time location systems
SECON'09 Proceedings of the 6th Annual IEEE communications society conference on Sensor, Mesh and Ad Hoc Communications and Networks
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
Channel estimation by inference on Gaussian Markov random fields
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
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In mobile positioning, it is very important to estimate correctly the delay between the transmitter and the receiver. When the receiver is in line-of-sight (LOS) condition with the transmitter, the computation of the mobile position in two dimensions becomes straightforward. In this paper, the problem of LOS detection in WCDMA for mobile positioning is considered, together with joint estimation of the delays and channel coefficients. These are very challenging topics in multipath fading channels because LOS component is not always present, and when it is present, it might be severely affected by interfering paths spaced at less than one chip distance (closely spaced paths). The extended Kalman filter (EKF) is used to estimate jointly the delays and complex channel coefficients. The decision whether the LOS component is present or not is based on statistical tests to determine the distribution of the channel coefficient corresponding to the first path. The statistical test-based techniques are practical, simple, and of low computation complexity, which is suitable for WCDMA receivers. These techniques can provide an accurate decision whether LOS component is present or not.