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Oral Session C : Saturday, March 23, 2013 / 9:00 - 10:00

The links on the papers titles are desabled the PDF versions are in the USB drive given to the IP-WiS'2013 participants
7A Study of Channel Estimation for 3GPP’s spatial channel model Extended in Downlink LTE Systems
Samia Dardouri
Ridha Bouallegue

Abstract:

In this paper, we study the channel estimation algorithms for the downlink LTE systems of 3GPP. By using computer simulation, the pilot signal assisted channel estimation algorithms based on least square (LS), linear minimum mean square error (LMMSE) criteria and SVD-LMMSE channel estimation, together with channel interpolation based on linear interpolation. The channel model is chosen as a typical urban scenario modeled by Spatial Channel Model Extended (SCME), which is implemented with the LTE downlink structure in this paper. The performance is measured using the mean square error (MSE) between LMMSE estimator with optimal rank reduction by singular value decomposition (SVD) can improve the estimation performance effectively. All channel estimation algorithms are simulated. The simulation conclusion is that the new channel estimations are more efficient.


10LTE Performance Evaluation with Realistic Channel Quality Indicator
Lamia Grira
Ridha Bouallegue

Abstract:

To evaluate the performance of new mobile network technologies, system level simulations are essential. They determine at which level the link level has an impact on network performance. Therefore, the network does be under realistic conditions. In this paper we study the performance of the Long Term Evolution (LTE) by using a MATLAB computationally efficient LTE system level simulator. The simulator is offered for free under an academic, noncommercial use license. The physical layer model is based on the post-equalization SINR (Signal To Interference Ratio), and abstracts the measurements for link adaptation and resource allocation and aims at reducing run-time computational complexity by pre-generating as many of the needed parameters as possible.


17Slepian Based Channel Interpolation for LTE Downlink System
Samia Dardouri
Ridha Bouallegue

Abstract:

In this paper, we investigate several efficient interpolation techniques for pilot symbol assisted channel estimation in OFDM. Many studies about interpolation have been published; however, the performance of which is limited by the number or the position of pilot subcarriers, such discrete prolate spheroidal (DPS) sequences for interpolation in the time-domain and linear interpolation method. We propose a Slepian (originally known as DPS) based channel interpolator for LTE downlink systems in high speed environments. The proposed channel interpolator is applied to recover the time variation of channel between training symbols within two consecutive slots in a single sub-frame. The performance of the proposed interpolator is compared with linear interpolator whose order is adjusted to achieve best fit under particular user mobility.

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