Elena Simona Lohan

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—A Bayesian method for dynamical off-line estimation of the position and path loss model parameters of a WLAN access point is presented. Two versions of three different on-line positioning methods are tested using real data. The tests show that the methods that use the estimated path loss parameter distributions with finite precisions outperform the methods(More)
—Accurate detection and estimation of overlapping fading multipath components is vital for many communication systems, particularly for positioning technologies. Traditional approaches used for channel estimation generally fail in estimating closely-spaced multipath components in code-division multiple access (CDMA) systems. Here, we present a highly(More)
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(More)
In positioning applications, where the line of sight (LOS) is needed with high accuracy, the accurate delay estimation is an important task. The new satellite-based positioning systems, such as Galileo and modernized GPS, will use a new modulation type, that is, the binary offset carrier (BOC) modulation. This type of modulation creates multiple peaks(More)
GRAMMAR (EC FP7) is a project aiming to deliver IP for future Galileo mass market receivers. One of the outcomes of this project will be an advanced Galileo receiver prototype. In this paper we present the research for finding the optimal dual frequency option for a Galileo mass market receiver. We discuss the impact of multiple frequencies on baseband(More)
The main modulation types selected for the future Galileo signals are sine and cosine Binary-Offset-Carrier (SinBOC/CosBOC) modulations. On one hand, BOC-modulated signals have a narrower main lobe of their Autocorrelation Function (ACF), which allows a better accuracy in the delay tracking process. On the other hand, the acquisition process becomes more(More)