قلم

وبلاگ امیرحسین حاجی حسینی

قلم

وبلاگ امیرحسین حاجی حسینی

قلم

طبقه بندی موضوعی

آخرین مطالب

۲ مطلب در شهریور ۱۳۹۷ ثبت شده است

Distributed Diffusion Based Spectrum Sensing for Cognitive Radio Sensor Networks Considering Link Failure

Amirhosein Hajihoseini Gazestani and Seyed Ali Ghorashi

Abstract:

Wireless sensor networks (WSNs) typically use license free industrial, scientific and medical (ISM) frequency bands and by increasing the demand for different usages of WSNs, it is anticipated that this band gets saturated. One solution to deal with this spectrum scarcity in WSNs is utilizing the cognitive radio concept, called cognitive radio sensor networks (CRSNs). One of the most critical challenges in CRSNs is spectrum sensing, which can be implemented by centralized, cluster based or distributed methods. In CRSNs, distributed methods have better spectrum sensing performance due to their fast adaptation to the network changes. Also they have lower power consumption level, which is critical in CRSNs. In this paper, we propose a novel distributed diffusion based spectrum sensing method for CRSNs that improves the robustness of the spectrum sensing method against link failure and network topology changes. It also increases the algorithm’s convergence rate while its accuracy is acceptable. We prove the proposed method convergence and calculate its mean square error, considering link failure assumption. Simulation results confirm that the proposed method improves the convergence rate compared with conventional distributed methods, and using the proposed method increases the convergence rate and needs less communications to make a decision about absence or presence of the primary user.

link of paper

۰ نظر موافقین ۰ مخالفین ۰ ۰۵ شهریور ۹۷ ، ۰۸:۳۳
Introduction and Patent Analysis of Signal Processing for Big Data
Mohammad Eslami, Amirhosein Hajihoseini Gazestani, Seyed Ali Ghorashi
Abstract: 
Big data is rapidly considered in different scientific domains, industries and business methods. Considering the concept of Internet of Things, big data is generated by everything around us continuously, and therefore, dealing with big data and its challenges are important and requires new thinking strategies and also techniques. Signal processing is one of the solutions that is utilized with big data in most scientific fields. This paper gives a brief introductory preview of the subjects included in this area and describes some of challenges and tactics. In order to show the rapid growth of attentions in signal processing for big data, a statistical analysis on corresponding patents is considered as well.
 
۰ نظر موافقین ۰ مخالفین ۰ ۰۱ شهریور ۹۷ ، ۰۸:۲۹