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وبلاگ امیرحسین حاجی حسینی

قلم

وبلاگ امیرحسین حاجی حسینی

قلم

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۲۶ مطلب با کلمه‌ی کلیدی «برنامه متلب» ثبت شده است

A Fingerprint Technique for Indoor Localization using Autoencoder based Semi-supervised Deep Extreme Learning Machine

Zahra Ezzati Khatab, Amirhosein Hajihoseini Gazestani, Seyed Ali Ghorashi, Mohammad Ghavami

Abstract:

In recent years, because of the growing demand for location based services in indoor environment and development of Wi-Fi, fingerprint-based indoor localization has attracted many researchers’ interest. In Wireless Sensor Networks (WSNs), fingerprint based localization methods estimate the target location by using a pattern matching model for the measurements of the Received Signal Strength (RSS) from the available transmitter sensors, which are collected by a smartphone with internal sensors. Due to the dynamic nature of the environment, the fingerprint database needs to be updated, periodically. Hence, it is better to add new fingerprint data to the primary database in order to update them. However, collecting the labeled data is time consuming and labor intensive. In this paper, we propose a novel algorithm, which uses high level extracted features by an autoencoder to improve the localization performance in the classification process. Furthermore, to update the fingerprint data base, we also add crowd-sourced labeled and unlabeled data in order to improve the localization performance, gradually. Simulation results indicate that the proposed method provides a significant improvement in localization performance, using high level extracted features by the autoencoder, and by increasing the number of unlabeled training data.

Link of Paper

 

۰ نظر موافقین ۰ مخالفین ۰ ۱۳ آذر ۹۹ ، ۲۰:۲۳

Joint Optimization of Power and Location in Full-Duplex UAV Enabled Systems

 Amirhosein Hajihoseini GazestaniSeyed Ali GhorashiZhaohui YangMohammad Shikh-Bahaei

 

Abstract: 

Unmanned aerial vehicles (UAVs) can be used as aerial base stations (BSs) for future small cells. They can increase the spectral efficiency of the small cells due to their higher probability to have line-of-sight (LOS) connections and their mobility as a BS. In this article, in order to show the effectiveness of using full-duplex (FD) technology in UAV networks, we consider a UAV equipped with FD technology (FD-UAV) with imperfect self-interference cancelation as an aerial BS that serves both uplink (UL) and downlink (DL) users simultaneously in a small cell network. We aim to maximize DL sum-rate, whilst prescribing a certain quality of service for UL users, by optimizing the location of FD-UAV and available resources. The problem is nonconvex; so we propose an iterative method by exploiting the difference of convex functions programming to jointly optimize transmission power of users, FD-UAV location, and FD-UAV transmission power. Simulation results are illustrated to show the effectiveness of the proposed method for FD-UAV in comparison with ground BS, in both FD and half-duplex modes.

Link of Paper

۰ نظر موافقین ۰ مخالفین ۰ ۱۳ آذر ۹۹ ، ۱۹:۱۸

Resource Allocation in Full-Duplex UAV Enabled Multi Small Cell Networks

 Amirhosein Hajihoseini Gazestani; Seyed Ali Ghorashi; Zhaohui Yang; Mohammad Shikh-Bahaei

Abstract:

Flying platforms such as Unmanned Aerial Vehicles (UAVs) are a promising solution for future small cell networks. UAVs can be used as aerial Base Stations (BSs) to enhance coverage, capacity and reliability of wireless networks. Also, with recent advances of Self Interference Cancellation (SIC) techniques in Full-Duplex (FD) systems, practical implementation of FD BSs is feasible. In this paper, we investigate the problem of resource allocation for multi-small cell networks with FD-UAVs as aerial BSs with imperfect SIC. We consider three different scenarios: a) maximizing the DL sum-rate, b) maximizing the UL sum-rate, and finally c) maximizing the sum of UL and DL sum-rates. The aforementioned problems result in non-convex optimization problems, therefore, successive convex approximation algorithms are developed by leveraging D.C. (Difference of Convex functions) programming to find sub-optimal solutions. Simulation results illustrated validity and effectiveness of the proposed radio resource management algorithms in comparison with ground BSs, in both FD mode and its half-duplex (HD) counterpart. The results also indicate those situations where using aerial BS is advantageous over ground BS and reveal how FD transmission enhances the network performance in comparison with HD one.

Link of Paper

۰ نظر موافقین ۰ مخالفین ۰ ۱۳ آذر ۹۹ ، ۱۹:۱۵

A Survey on Implementation and Applications of Full Duplex Wireless Communications

Amirhosein Hajihoseini Gazestani, Seyed Ali Ghorashi, Behnaz Mousavinasab, Mohammd Shikh-Bahaei

Abstract

Nowadays, wireless networks play an important role in our daily life. Hence, radio frequency (RF) spectrum which is required to support the large number of users of these networks, have become a very valuable resource. Full Duplex(FD) communications, in which data can be sent and received using the same frequency band at the same time, is a promising solution for satisfying, at least in part, the ever increasing demand for wireless spectrum. Theoretically, FD could double the spectral efficiency and capacity. However, in order to harvest these benefits, it has to combat/suppress self-interference (SI) caused by transmitting and receiving data, simultaneously. FD systems should use SI cancellation methods to deal with this important challenge. Due to the significant benefits of FD communication, this research area has recently attracted much attention among the research community. In this paper, we review the applications and implementation challenges of FD communication in different subject areas such as energy harvesting, vehicular communication, massive Multiple-Input Multiple-Output (MIMO), small cells, practical implementation, millimeter wave and military applications. We also study the tradeoffs in deploying FD communication in each of the applications.

Link of paper

۰ نظر موافقین ۰ مخالفین ۰ ۰۵ فروردين ۹۸ ، ۱۸:۳۷

شاخه دانشجویی IEEE دانشکده مهندسی برق دانشگاه شهید بهشتی برگزار می کند:

چهارشنبه پنجم و بیست و نهم اردیبهشت، آمفی تئاتر دانشکده مهندسی برق دانشگاه شهید بهشتی

۰ نظر موافقین ۰ مخالفین ۰ ۲۷ فروردين ۹۷ ، ۱۵:۴۳

شاخه دانشجویی IEEE دانشکده مهندسی برق دانشگاه شهید بهشتی برگزار می کند:

 پوستر

پنجشنبه بیست و هفتم مهر و چهار آبان، آمفی تئاتر دانشکده مهندسی برق دانشگاه شهید بهشتی

۰ نظر موافقین ۰ مخالفین ۰ ۰۷ مهر ۹۶ ، ۱۰:۲۸

شاخه دانشجویی IEEE دانشکده مهندسی برق دانشگاه شهید بهشتی برگزار می کند:

پوستر

پنجشنبه سیزدهم و بیستم مهرماه، آمفی تئاتر دانشکده مهندسی برق دانشگاه شهید بهشتی

۰ نظر موافقین ۰ مخالفین ۰ ۰۶ مهر ۹۶ ، ۱۲:۰۶

پژوهشکده فضای مجازی دانشگاه شهید بهشتی با همکاری شاخه دانشجویی IEEE برگزار می کند:

پوستر

۰ نظر موافقین ۰ مخالفین ۰ ۰۶ مهر ۹۶ ، ۱۱:۵۹

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۰ نظر موافقین ۰ مخالفین ۰ ۰۳ اسفند ۹۵ ، ۱۸:۴۵

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۷ نظر موافقین ۰ مخالفین ۰ ۱۰ دی ۹۴ ، ۱۱:۱۷