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Two Low Profile Unbalanced Fed Inverted L Elements on Square Conducting Plane for MIMO Applications 方形导电平面上两种低轮廓非平衡馈电倒L型元件的MIMO应用
无线工程与技术(英文) Pub Date : 2014-04-29 DOI: 10.4236/WET.2014.52005
E. Rohadi, M. Taguchi
{"title":"Two Low Profile Unbalanced Fed Inverted L Elements on Square Conducting Plane for MIMO Applications","authors":"E. Rohadi, M. Taguchi","doi":"10.4236/WET.2014.52005","DOIUrl":"https://doi.org/10.4236/WET.2014.52005","url":null,"abstract":"Two ultra low profile inverted L antennas located on the square conducting plane are numerically and experimentally analyzed as the multiple input multiple output (MIMO) antenna system. When the size of conducting plane is 0.45 λ by 0.45 λ and the height of antenna is 0.03 λ, the directive gain of 4.12 dBi and the return loss bandwidth of 3.67% are achieved. The proposed antenna has good diversity gain shown by the correlation coefficient, and becomes less than 0.02 at the frequency of 2.45 GHz band when the distance between inverted L elements is 0.33 λ. The results show the weak mutual coupling of the proposed antenna and its performances are promising as MIMO antenna applications.","PeriodicalId":68067,"journal":{"name":"无线工程与技术(英文)","volume":"5 1","pages":"34-43"},"PeriodicalIF":0.0,"publicationDate":"2014-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70839182","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: 5
Wireless Power Transmission into a Space Enclosed by Metal Walls Using Magnetic Resonance Coupling 利用磁共振耦合将无线电力传输到金属墙封闭的空间
无线工程与技术(英文) Pub Date : 2014-01-09 DOI: 10.4236/WET.2014.51003
M. Yamakawa, Y. Mizuno, Jun Ishida, K. Komurasaki, H. Koizumi
{"title":"Wireless Power Transmission into a Space Enclosed by Metal Walls Using Magnetic Resonance Coupling","authors":"M. Yamakawa, Y. Mizuno, Jun Ishida, K. Komurasaki, H. Koizumi","doi":"10.4236/WET.2014.51003","DOIUrl":"https://doi.org/10.4236/WET.2014.51003","url":null,"abstract":"In this paper, a wireless power transmission system using magnetic resonance coupling was proposed and demonstrated for supplying power at high efficiency to electrical devices in a space enclosed by metal walls. This is applicable to power supply to electrical sensors or devices working in the area surrounded by metal walls. Proposed magnetic resonance coupling system is driven at a resonance frequency of 50 Hz, which is selected to avoid eddy current loss on the surrounding metals. Firstly, resonator designs and its performance limitation were described. Secondly, the equivalent circuits and theoretical transmission efficiency were presented. Finally, power transmission was experimentally demonstrated and transmission efficiency was measured in some conceivable situations. As a result, electric power of 3 W was supplied to LEDs over a stainless steel wall. When the stainless steel wall thickness was 10 mm, transmission efficiency of approximately 40% was achieved over the transmission distance of 12 cm. Moreover, in the demonstration of transmission through a metal pipe, 1.2 W of power was transmitted to LEDs in a 10 mm thick metal pipe.","PeriodicalId":68067,"journal":{"name":"无线工程与技术(英文)","volume":"5 1","pages":"19-24"},"PeriodicalIF":0.0,"publicationDate":"2014-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70838724","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: 34
Opportunistic Usage of Maritime VHF Band—Deployment Challenges for a New Regulatory Framework 海上VHF频段的机会性使用对新监管框架部署的挑战
无线工程与技术(英文) Pub Date : 2014-01-09 DOI: 10.4236/WET.2014.51001
E. Bolas, N. Carvalho, J. Vieira, Paulo M. T. de Oliveira
{"title":"Opportunistic Usage of Maritime VHF Band—Deployment Challenges for a New Regulatory Framework","authors":"E. Bolas, N. Carvalho, J. Vieira, Paulo M. T. de Oliveira","doi":"10.4236/WET.2014.51001","DOIUrl":"https://doi.org/10.4236/WET.2014.51001","url":null,"abstract":"Similarly to other domains, maritime community requests for broadband services have been significantly increasing. Worldwide navigation footprint and the lack of practical alternatives to Satellite Communications (SATCOM) empower VHF band as the natural choice to support most of those demands. Nevertheless, the major challenge for an implementation of maritime broadband VHF services is unquestionably the spectrum availability and management. Eventually, the solution must include spectrum sharing, using a Cognitive Radio (CR) based approach, but unfortunately current regulatory framework and spectrum management regime are not appropriate for such concepts and emerging technologies. To overcome such constraints, it is necessary to address a whole field of regulatory and standardization issues in order to prepare an evolution towards a more flexible and dynamic approach to spectrum management and a transition that would ensure incumbents live operations and legacy systems. The required paradigm change encompasses a new policy definition, an enforcement mechanism implementation and a comprehensive transition plan. The presented analysis pretends to address the regulatory feasibility of a framework change, discusses its evolving process and points some challenges related with practical aspects associated to Quality of Service (QoS) enforcement metrics definition, centering the arguments in maritime VHF band.","PeriodicalId":68067,"journal":{"name":"无线工程与技术(英文)","volume":"5 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2014-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70838929","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
Full-Filling Subcarrier Power Allocation in OFDMA-Based Cognitive Radio Systems 基于ofdma认知无线电系统的满载波功率分配
无线工程与技术(英文) Pub Date : 2014-01-09 DOI: 10.4236/WET.2014.51002
T. L. Van, Hieu Dinh Chi, Kinh Nguyen Viet, Hieu Nguyen Thanh
{"title":"Full-Filling Subcarrier Power Allocation in OFDMA-Based Cognitive Radio Systems","authors":"T. L. Van, Hieu Dinh Chi, Kinh Nguyen Viet, Hieu Nguyen Thanh","doi":"10.4236/WET.2014.51002","DOIUrl":"https://doi.org/10.4236/WET.2014.51002","url":null,"abstract":"When implementing an appropriate windowing, the interference from a Cognitive Radio (CR) system to licensed systems (primary users) will be significantly reduced. Consequently, power allocated to subcarriers can be increased, especially subcarriers having far spectral distance to primary user bands can be allocated full of its maximum possible power. In this paper, we propose a new class of sub-optimal subcarrier power allocation algorithm that significantly reduces complexity of OFDMA-based CR systems. Two sub-optimal proposals, called Pre-set Filling Range (PFR) and Maximum Filling Range (MFR) are studied. Investigations show that this new power allocating algorithm allows CR systems obtain high throughput while retaining low complexity.","PeriodicalId":68067,"journal":{"name":"无线工程与技术(英文)","volume":"5 1","pages":"11-18"},"PeriodicalIF":0.0,"publicationDate":"2014-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70838595","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: 3
Parallel Algorithms for Residue Scaling and Error Correction in Residue Arithmetic 残数缩放的并行算法及残数算法中的误差校正
无线工程与技术(英文) Pub Date : 2013-09-24 DOI: 10.4236/WET.2013.44029
H. Lo, Ting-wei Lin
{"title":"Parallel Algorithms for Residue Scaling and Error Correction in Residue Arithmetic","authors":"H. Lo, Ting-wei Lin","doi":"10.4236/WET.2013.44029","DOIUrl":"https://doi.org/10.4236/WET.2013.44029","url":null,"abstract":"In this paper, we present two new algorithms in residue number systems for scaling and error correction. The first algorithm is the Cyclic Property of Residue-Digit Difference (CPRDD). It is used to speed up the residue multiple error correction due to its parallel processes. The second is called the Target Race Distance (TRD). It is used to speed up residue scaling. Both of these two algorithms are used without the need for Mixed Radix Conversion (MRC) or Chinese Residue Theorem (CRT) techniques, which are time consuming and require hardware complexity. Furthermore, the residue scaling can be performed in parallel for any combination of moduli set members without using lookup tables.","PeriodicalId":68067,"journal":{"name":"无线工程与技术(英文)","volume":"04 1","pages":"198-213"},"PeriodicalIF":0.0,"publicationDate":"2013-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70838861","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: 7
Tri-Band Fractal Antennas for RFID Applications RFID应用的三波段分形天线
无线工程与技术(英文) Pub Date : 2013-09-24 DOI: 10.4236/WET.2013.44025
Abdelati Reha, A. O. Said
{"title":"Tri-Band Fractal Antennas for RFID Applications","authors":"Abdelati Reha, A. O. Said","doi":"10.4236/WET.2013.44025","DOIUrl":"https://doi.org/10.4236/WET.2013.44025","url":null,"abstract":"The RFID is a rapidly developing technology. It’s used in many applications such as logistics, ticketing, security, employee attendance record and others. Also, fractal technology is used in many areas, and recently in antenna design because it allows making multi-band and wide-band antennas. In this paper, two tri-band fractal antennas are studied for the Radio Frequency Identification (RFID) applications using the Method of Moment (MoM). The first one is designed for the RFID readers and it operates at 3.85 GHZ, 5.80 GHZ and 8.12 GHZ. The second one is designed for the RFID Tags and it operates at 3.94 GHZ, 5.65 GHZ and 8.20 GHZ.","PeriodicalId":68067,"journal":{"name":"无线工程与技术(英文)","volume":"4 1","pages":"171-176"},"PeriodicalIF":0.0,"publicationDate":"2013-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70838206","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: 19
Performance Assessment for LTE-Advanced Networks with Uniform Fractional Guard Channel over Soft Frequency Reuse Scheme 基于软频率复用方案的统一分数保护信道LTE-Advanced网络性能评估
无线工程与技术(英文) Pub Date : 2013-09-24 DOI: 10.4236/WET.2013.44024
M. Safwat, H. El-Badawy, Ahmad Yehya, H. El-motaafy
{"title":"Performance Assessment for LTE-Advanced Networks with Uniform Fractional Guard Channel over Soft Frequency Reuse Scheme","authors":"M. Safwat, H. El-Badawy, Ahmad Yehya, H. El-motaafy","doi":"10.4236/WET.2013.44024","DOIUrl":"https://doi.org/10.4236/WET.2013.44024","url":null,"abstract":"Dropping probability of handoff calls and blocking probability of new calls are two important Quality of Service (QoS) measures for LTE-Advanced networks. Applying QoS for Cell edge users in soft frequency reuse scheme in LTE system is a challenge as they already suffer from limited resources. Assigning some resources for handover calls may enhance dropping probability but this is in price of degradation in the blocking probability for new calls in cell-edge. Uniform Fractional Guard Channel (UFGC) is a call admission policy that provides QoS without reserving resources for handover calls. In this paper, the performance of Soft Frequency Reuse (SFR) in presence of Uniform Fractional Guard Channel (UFGC) will be investigated using queuing analysis. The mathematical model and performance metrics will be deduced in this assessment. The impact of UFGC will be evaluated in edge and core part separately. Then the optimal value for the parameter of UFGC will be obtained to minimize the blocking probability of new calls with the constraint on the upper bound on the dropping probability of handoff calls.","PeriodicalId":68067,"journal":{"name":"无线工程与技术(英文)","volume":"04 1","pages":"161-170"},"PeriodicalIF":0.0,"publicationDate":"2013-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70838103","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: 5
A U-Shaped UWB Antenna with Band-Notched Performance 一种带缺口性能的u型超宽带天线
无线工程与技术(英文) Pub Date : 2013-09-24 DOI: 10.4236/WET.2013.44026
A. Hosseinzadeh, M. Mirmozafari, Mohammad Vatankhah Varnoosfaderani, C. Ghobadi, J. Nourinia
{"title":"A U-Shaped UWB Antenna with Band-Notched Performance","authors":"A. Hosseinzadeh, M. Mirmozafari, Mohammad Vatankhah Varnoosfaderani, C. Ghobadi, J. Nourinia","doi":"10.4236/WET.2013.44026","DOIUrl":"https://doi.org/10.4236/WET.2013.44026","url":null,"abstract":"An ultra-wideband antenna with controllable band-notched is presented. Two semi-ellipses with different radiuses are subtracted to result in the main patch. By varying inner and outer radiuses, much more enhancement in bandwidth occurred. A U-shaped slot is used to make band-stop performance. Measured S11 is ≤-10 dB over 2.3 - 5 GHz and 6.1 - 15.1 GHz.","PeriodicalId":68067,"journal":{"name":"无线工程与技术(英文)","volume":"04 1","pages":"177-180"},"PeriodicalIF":0.0,"publicationDate":"2013-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70838333","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
Estimation of Two-Dimensional Correction Factors for Min-Sum Decoding of Regular LDPC Code 正则LDPC码最小和译码的二维校正因子估计
无线工程与技术(英文) Pub Date : 2013-09-24 DOI: 10.4236/WET.2013.44027
A. HamadAhmed
{"title":"Estimation of Two-Dimensional Correction Factors for Min-Sum Decoding of Regular LDPC Code","authors":"A. HamadAhmed","doi":"10.4236/WET.2013.44027","DOIUrl":"https://doi.org/10.4236/WET.2013.44027","url":null,"abstract":"In this paper, two-dimensional (2-D) correction scheme is proposed to improve the performance of conventional Min-Sum (MS) decoding of regular low density parity check codes. The adopted algorithm to obtain the correction factors is simply based on estimating the mean square difference (MSD) between the transmitted codeword and the posteriori information of both bit and check node that produced at the MS decoder. Semi-practical tests using software-defined radio (SDR) and specific code simulations show that the proposed quasi-optimal algorithm provides a comparable error performance as Sum-Product (SP) decoding while requiring less complexity.","PeriodicalId":68067,"journal":{"name":"无线工程与技术(英文)","volume":"2013 1","pages":"181-187"},"PeriodicalIF":0.0,"publicationDate":"2013-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70838630","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: 3
Resource Optimisation for 3rd Generation Partnership Project (3GPP) Long Term Evolution OFDMA Downlink Interface Air 第三代合作伙伴计划(3GPP)长期演进OFDMA下行接口的资源优化
无线工程与技术(英文) Pub Date : 2013-09-24 DOI: 10.4236/WET.2013.44028
Akinniranye Ayoola Akinloye, O. Adenle
{"title":"Resource Optimisation for 3rd Generation Partnership Project (3GPP) Long Term Evolution OFDMA Downlink Interface Air","authors":"Akinniranye Ayoola Akinloye, O. Adenle","doi":"10.4236/WET.2013.44028","DOIUrl":"https://doi.org/10.4236/WET.2013.44028","url":null,"abstract":"This Paper describes the system model of the developed optimisation scheme which is implemented using a simulation package known as MATLAB. The 3rd Generation Partnership Project (3GPP) Long Term Evolution standard for the downlink air interface, Orthogonal Frequency Division Multiple Access (OFDMA) was adopted. Frequency Selective Rayleigh fading channel is considered as a model for real life scenario of the LTE Evaluation, operating in 5 MHz downlink bandwidth of OFDMA parameters as proposed in the standard. Simulation results show that, the inherent characteristics of a communication channel can be exploited and combined with the robustness of OFDMA to optimally allocate the radio resources. The optimal channel assignment of the dynamic allocation scheme exploited in this work meets the set target of high data rate and spectral efficiency.","PeriodicalId":68067,"journal":{"name":"无线工程与技术(英文)","volume":"28 1","pages":"188-197"},"PeriodicalIF":0.0,"publicationDate":"2013-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70838991","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: 3
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