Browsing by Author "Fattouche, Michel"

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    A Hybrid RSS/TOA Method for 3D Positioning in an Indoor Environment
    (2012-03-01) Tiwari, Smita; Wang, Donglin; Fattouche, Michel; Ghannouchi, Fadhel
    This paper investigates 3D positioning in an indoor line of sight (LOS) and nonline of sight (NLOS) combined environment. It is a known fact that time-of-arrival-(TOA-) based positioning outperforms other techniques in LOS environments; however, multipath in an indoor environment, especially NLOS multipath, significantly decreases the accuracy of TOA positioning. On the other hand, received-signal-strength-(RSS-) based positioning is not affected so much by NLOS multipath as long as the propagation attenuation can be correctly estimated and the multipath effects have been compensated for. Based on this fact, a hybrid weighted least square (HWLS) RSS/TOA method is proposed for target positioning in an indoor LOS/NLOS environment. The identification of LOS/NLOS path is implemented by using Nakagami distribution. An experiment is conducted in the iRadio lab, in the ICT building at the University of Calgary, in order to (i) demonstrate the availability of Nakagami distribution for the identification of LOS and NLOS path, (ii) estimate the pass loss exponent for RSS technique, and (iii) verify our proposed scheme.
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    Cooperative Spectrum Sensing Algorithm in Cognitive Radio By Simultaneous Sensing and BER Measurements
    (EURASIP Journal on Wireless Communications and Networking, 2016-05-09) Lu, Yingqi; Wang, Donglin; Fattouche, Michel
    This paper considers spectrum utilization, the probability of detection in cognitive radio (CR) model based on cooperative spectrum sensing with both simultaneous adaptive sensing and transmission at a transmitting secondary user (TSU), and the bit error rate (BER) detection with variation checking at a receiving user (RSU). In this paper, a novel detecting model is proposed in the being considered scenario for the full-duplex TSU's simultaneous sensing and transmitting. A spectrum sensing scheme with an adaptive sensing window is designed to improve the spectrum utilization with a high SNR. At RSU, the BER variation is used further to detect whether a PU is active or not. Data fusion based on the proposed adaptive sensing scheme and the BER detection is processed for better decision on the spectrum holes. Simulation results show that i) simultaneous spectrum sensing with an adaptive window improves the spectrum utilization compared with a periodical sensing; ii) cooperative spectrum sensing with the BER-assisted detection improves the probability of detection and spectrum utilization compared with the single simultaneous sensing at TSU.
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    Open Access
    A Hybrid RSS/TOA Method for 3D Positioning in an Indoor Environment
    (Hindawi Publishing Corporation, 2011-11-21) Tiwari, Smita; Wang, Donglin; Fattouche, Michel; Ghannouchi, Fadhel
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    Multicarrier code for the next-generation GPS
    (Springer Open, 2012-05-31) Wang, Donglin; Fattouche, Michel; Ghannouchi, Fadhel