Global connectivity cannot be guaranteed by terrestrial networks due to the lack of infrastructure in rural areas. Neither can satellite networks assure this due to lack of signal penetration and capacity coverage issues in densely populated areas. To bridge this gap, we propose an Orthogonal Frequency Domain (OFDM) based hybrid architecture where users are provided service by existing mobile n...

The femto-access-point, a low-cost and small-size cellular base-station, is envisioned to be widely deployed in subscribers homes, as to provide high data-rate communications with improved quality of service. As femtocellular networks will co-exist with macrocellular networks, mitigation of the interference between these two network types is a key challenge for successful integration of these t...

As frequency is a scarce resource, so efforts are being made to use the allotted frequency spectrum as competently as possible. The concept of Frequency Reuse efficiently serves this purpose by reusing the frequencies and channels in a communication system to improve its capacity and spectral efficiency. Cognitive Radio is one of the emerging technologies that apply frequency reuse method as it...

This paper investigates the performance and capacity of a WiMAX 802.16e cellular system deployed via High Altitude Platform (HAP WiMAX) through extensive simulations. HAP WiMAX link performance is evaluated for a wide range of channel conditions in terms of elevation angle and signal to noise ratio (SNR) through a comprehensive link level simulator based on 802.16e. The obtained results are the...

Self-medication and inappropriate storage of medicines at home are potential health risks. This crosssectional study in south-east Islamic Republic of Iran in 2010 aimed to determine where householders kept their medicines and to assess the frequency and determinants of self-medication. Householders from different parts of Birjand city (n = 500) were visited and completed a semi-structured ques...

This paper proposes a personal learning assistant called LORAMS (Link of RFID and Movies System), which supports the learners with a system to share and reuse learning experience by linking movies and environmental objects. These movies are not only kind of classes’ experiments but also daily experiences movies. Therefore, you can share these movies with other people. LORAMS can infer some cont...

This paper briefly describes the approaches taken to the two subtasks of Source Retrieval and Text Alignment, in the Plagiarism Detection track at PAN 13. For the first of these, we reuse our PAN12 approach – which combines frequency and a contrastive corpus measure to select keywords for querying the ChatNoir search system; for the second, we reuse software that had previously featured in PAN1...

In this paper, using the EDGE system as an example, we apply a Kalman-filter power control method based on interference tracking and prediction to packet voice service in wireless networks. Our results reveal that power control significantly improves the spectral efficiency by enabling 1/3 frequency reuse while maintaining a stringent requirement of 2% packet loss probability for voice service....

introduction :by ever-increasing of population, shortage of water resources and the necessity of wastewater treatment, huge volumes of sludge that is a byproduct of wastewater treatment, requires to be disposed in environmentally secure ways. the target of specifying strategic preferences of reuse of sludge has been to find the correct way of disposal or beneficial use of sludge. material and m...