无线工程与技术(英文)最新文献_第5页

Genetic Algorithm Based QoS Aware Adaptive Subcarrier Allocation in Cognitive Radio Networks 基于遗传算法的认知无线网络QoS感知自适应子载波分配

无线工程与技术(英文) Pub Date : 2015-10-12 DOI: 10.4236/WET.2015.64009

D. Patil, V. Wankhede, V. Wadhai

{"title":"Genetic Algorithm Based QoS Aware Adaptive Subcarrier Allocation in Cognitive Radio Networks","authors":"D. Patil, V. Wankhede, V. Wadhai","doi":"10.4236/WET.2015.64009","DOIUrl":"https://doi.org/10.4236/WET.2015.64009","url":null,"abstract":"In this paper, an adaptive subcarrier allocation scheme with reconfiguration of operating parameters for Cognitive Radio Networks (CRN) is presented. A QoS-conscious spectrum decision frame work is projected, where spectrum bands are determined by considering the application requirements as well as the dynamic nature of the spectrum bands. The novel subcarrier allocation algorithm is developed to fulfill different performance objective as a solution for subcarrier allocation and power allocation problem for Cognitive Radio (CR) users in CRNs. It employs operating frequency parameter modification using Proportional Resource Algorithm and Genetic Algorithm (GA). The multi objective optimization problem with equality and inequality constraint is considered. Moreover, a dynamic subcarrier allocations scheme is developed based on GA to decide on the spectrum bands adaptively dependent on the time-varying CR network capacity. The proposed algorithm targets to achieve maximum data rate for each subcarrier, maximize the overall network throughput and maximize the number of satisfied user under the constraints of bandwidth and guarantee Quality of Service (QoS) requirement from dynamic spectrum management (DSM) perspective. Moreover, it determines the best available channel.","PeriodicalId":68067,"journal":{"name":"无线工程与技术(英文)","volume":"06 1","pages":"87-97"},"PeriodicalIF":0.0,"publicationDate":"2015-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70839758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Experimental Analysis of UWB Signal Performance in a Constrained Environment for Railway Application 铁路约束环境下超宽带信号性能实验分析

无线工程与技术(英文) Pub Date : 2015-10-12 DOI: 10.4236/WET.2015.64008

O. Cohin, Sara Ibenjellal, F. Boukour, S. Baranowski

{"title":"Experimental Analysis of UWB Signal Performance in a Constrained Environment for Railway Application","authors":"O. Cohin, Sara Ibenjellal, F. Boukour, S. Baranowski","doi":"10.4236/WET.2015.64008","DOIUrl":"https://doi.org/10.4236/WET.2015.64008","url":null,"abstract":"In the railway application, in order to establish the communication between wagons, some technologies are proposed such as the ZigBee and HTN (Hybrid Networking Technology). However, these techniques have some limitations such as: the low data rate, non-secured transmission and interferences. The Ultra Wide Band (UWB) technology presents a good alternative and a good candidate for this application. In recent years, UWB communication systems have received significant attention from both the industry and the academia. In February 2002, the Federal Communications Commission (FCC) allocated 7500 MHz of spectrum (from 3.1 GHz to 10.6 GHz) for use by UWB devices. This ruling has helped to create new standardization efforts, like IEEE 802.15.3a, which focus on developing high speed wireless communication systems. The application of the UWB radio technique in the transport is a more recent topic that is thoroughly researched considering several factors including the nature of the transport propagation environment; the use of adequate transmitting/receiving duty cycle (LDC); the number of devices using UWB technology, the types and levels of interferences. Regulation bodies have considered these railway applications. Impulse Radio Ultra Wideband (IR-UWB) systems have been studied for their inherent advantages of coexistence with narrowband systems with high data rate over short distances with sufficiently small amount of transmitted power. The UWB systems are highly susceptible to interference between the coexisting narrowband systems because of very low transmission power. This paper considers the use of the UWB radio technology for railway application. In this paper, we evaluate the communication performance in constrained environment for the railway application.","PeriodicalId":68067,"journal":{"name":"无线工程与技术(英文)","volume":"6 1","pages":"79-86"},"PeriodicalIF":0.0,"publicationDate":"2015-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70839691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Wireless Power Transmission into Metallic Tube Using Axial Slit for Infrastructure Diagnostics 利用轴向狭缝向金属管无线输电进行基础设施诊断

无线工程与技术(英文) Pub Date : 2015-07-08 DOI: 10.4236/WET.2015.63006

K. Shimamura, K. Komurasaki

引用次数: 6

Multiband Monopole Antenna with Sector-Nested Fractal 扇区嵌套分形多波段单极天线

无线工程与技术(英文) Pub Date : 2015-07-08 DOI: 10.4236/wet.2015.63005

Jie Zhang, Wei Zhang

引用次数: 0

Systematic Approaches of UWB Low-Power CMOS LNA with Body Biased Technique 基于体偏置技术的超宽带低功耗CMOS LNA系统实现

无线工程与技术(英文) Pub Date : 2015-07-08 DOI: 10.4236/WET.2015.63007

Meng-Ting Hsu, Kun-Long Wu, Wen-Chen Chiu

{"title":"Systematic Approaches of UWB Low-Power CMOS LNA with Body Biased Technique","authors":"Meng-Ting Hsu, Kun-Long Wu, Wen-Chen Chiu","doi":"10.4236/WET.2015.63007","DOIUrl":"https://doi.org/10.4236/WET.2015.63007","url":null,"abstract":"This paper presents research on a low power CMOS UWB LNA based on a cascoded common source and current-reused topology. A systematic approach for the design procedure from narrow band to UWB is developed and discussed in detail. The power reduction can be achieved by using body biased technique and current-reused topology. The optimum width of the major transistor device M1 is determined by the power-constraint noise optimization with inner parasitic capacitance between the gate and source terminal. The derivation of the signal amplification S21 by high frequency small signal model is displayed in the paper. The optimum design of the complete circuit was studied in a step by step analysis. The measurements results show that the proposed circuit has superior S11, gain, noise figure, and power consumption. From the measured results, S11 is lower than -12 dB, S22 is lower than -10 dB and forward gain S21 has an average value with 12 dB. The noise figure is from 4 to 5.7 dB within the whole band. The total power consumption of the proposed circuit including the output buffer is 4.6 mW with a supply voltage of 1 V. This work is implemented in a standard TSMC 0.18 μm CMOS process technology.","PeriodicalId":68067,"journal":{"name":"无线工程与技术(英文)","volume":"6 1","pages":"61-77"},"PeriodicalIF":0.0,"publicationDate":"2015-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70839577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Dual Band David Fractal Microstrip Patch Antenna for GSM and WiMAX Applications 双波段大卫分形微带贴片天线用于GSM和WiMAX应用

无线工程与技术(英文) Pub Date : 2015-06-05 DOI: 10.4236/WET.2015.62004

Jacob Abraham, T. Mathew

引用次数: 7

Throughput Estimation with Noise Uncertainty for Cyclostationary Feature Detector in Cognitive Radio Network 认知无线网络循环平稳特征检测器的噪声不确定性吞吐量估计

无线工程与技术(英文) Pub Date : 2015-06-05 DOI: 10.4236/WET.2015.62003

M. M. Tantawy

引用次数: 0

Energy Efficiency Behavior in Heterogeneous Networks under Various Operating Situations of Cognitive Small Cells 认知小细胞不同运行状态下异构网络的能效行为

无线工程与技术(英文) Pub Date : 2015-01-06 DOI: 10.4236/WET.2015.61002

Amr A. Fahmy, Asmaa M. Saafan, H. El-Badawy, S. Elramly

{"title":"Energy Efficiency Behavior in Heterogeneous Networks under Various Operating Situations of Cognitive Small Cells","authors":"Amr A. Fahmy, Asmaa M. Saafan, H. El-Badawy, S. Elramly","doi":"10.4236/WET.2015.61002","DOIUrl":"https://doi.org/10.4236/WET.2015.61002","url":null,"abstract":"Recently, several approaches were followed for the enhancement and better resource utilization in mobile networks; this is to achieve energy efficient consumption for production and delivery of an information bit. Using Cognitive Femto cells (as a member of the small base stations’ family) proves that, it is an efficient solution for achieving this goal[1]. The use of Energy Efficiency term η has become one of the major indices for measuring the performance of these systems. η is the measure of the overall system Capacity (C) in bps/Hz versus the Consumed Energy (E) in Joules [2]. In consistence with many researches, analytic models and empirical measurements, η will be investigated throughout the course of this work. Cognitive Base Stations (CBS) (as an element of the system model) which performs the traffic offloading operations is proved to enhance η performance. In this work, a combination of both analytic and simulation models are used to construct a practical system model. The obtained model is then used to illustrate the effect of different operational parameters that are involved in the η problem. On the other hand, the current paper tries to focus on the selection criteria that may be used to design the cooperative cognitive networks in order to achieve the best η indices. Both of CBSs radii as well as the inter-separation distances (between CBSs and MBS location) are examined to obtain best η index for different operation scenarios; in addition, both of capacity and energy consumption are taken into consideration based on practical operating measures. This work proposed several nonlinear equations with fixed parameters to be used by field engineers to achieve the results with minimum reduced computation complexity. So, the current work may be of importance for the regulator bodies as well as the cognitive mobile operators.","PeriodicalId":68067,"journal":{"name":"无线工程与技术(英文)","volume":"6 1","pages":"9-23"},"PeriodicalIF":0.0,"publicationDate":"2015-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4236/WET.2015.61002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70839257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A Compact Wideband Dual-Polarized Printed Antenna with Coaxial Feeds for TD-SCDMA Application TD-SCDMA应用中同轴馈源的紧凑型宽带双极化印刷天线

无线工程与技术(英文) Pub Date : 2015-01-06 DOI: 10.4236/WET.2015.61001

Yujie Liu, Wei Tang, Y. Ge, Guogang Li

引用次数: 1

Analysis and Impact of Surface Acoustic Wave Filter in-Band Ripple on Testing and Measurement of High Data Rate Communications 表面声波滤波器带内纹波对高数据速率通信测试与测量的分析与影响

无线工程与技术(英文) Pub Date : 2014-10-08 DOI: 10.4236/WET.2014.54013

Taher Al Sharabati

引用次数: 0