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2017 Japan-Africa Conference on Electronics, Communications and Computers (JAC-ECC)最新文献

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Noise estimation for multiuser multi-carrier PUCCH in LTE-A LTE-A中多用户多载波PUCCH噪声估计
2017 Japan-Africa Conference on Electronics, Communications and Computers (JAC-ECC) Pub Date : 2017-12-01 DOI: 10.1109/JEC-ECC.2017.8305781
Mina M. Monieb, Y. Fahmy
{"title":"Noise estimation for multiuser multi-carrier PUCCH in LTE-A","authors":"Mina M. Monieb, Y. Fahmy","doi":"10.1109/JEC-ECC.2017.8305781","DOIUrl":"https://doi.org/10.1109/JEC-ECC.2017.8305781","url":null,"abstract":"In Long Term Evolution (LTE) system, PUCCH — Physical Uplink Control Channel-is responsible for transmission of the control information from the user equipment (UE) to the base station (eNodeB). PUCCH introduced a new format — format 3 — to accommodate the increase of Hybrid Automatic Repeat request (HARQ) bits resulting from Multi-carrier transmission. This format suffers from poor noise estimation accuracy problem that affects the detection probability and degrades the whole system throughput. Two independent algorithms for noise estimation are introduced in this paper for CDMA multiuser multicarrier PUCCH format 3. The first algorithm is based on noise detection from data symbols, while the second algorithm is based on noise estimation from pilot symbols. Simulation results showed the accuracy of noise estimation in both algorithms in the presence of multipath fading channels.","PeriodicalId":406498,"journal":{"name":"2017 Japan-Africa Conference on Electronics, Communications and Computers (JAC-ECC)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126120333","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: 0
An ultra compact quad-band bandpass filter with high harmonic suppression using SL-TSSIR 一种使用SL-TSSIR的超紧凑四带带通滤波器，具有高谐波抑制功能
2017 Japan-Africa Conference on Electronics, Communications and Computers (JAC-ECC) Pub Date : 2017-12-01 DOI: 10.1109/JEC-ECC.2017.8305783
A. M. Salem, H. Ahmed, Ehab K. Abouseif, Magdy A. Elkfafy
{"title":"An ultra compact quad-band bandpass filter with high harmonic suppression using SL-TSSIR","authors":"A. M. Salem, H. Ahmed, Ehab K. Abouseif, Magdy A. Elkfafy","doi":"10.1109/JEC-ECC.2017.8305783","DOIUrl":"https://doi.org/10.1109/JEC-ECC.2017.8305783","url":null,"abstract":"This paper presents a highly compact quadband bandpass filter architecture, based on a new modified tri-section stepped impedance resonator TSSIR, serving multi-standard wireless communications systems. The proposed filter is composed of a second order tri-section SIRs loaded with a short stub resulting in four arbitrary frequency modes, three of them created by the TSSIR while the fourth is dependent on the TSSIR and the short stubs. The inclusion of the short stubs allows for creation of a much lower frequency band without sacrificing the filter size or insertion loss. As proof of concept, a quadband filter operating in the 0.75, 2.1, 3.5, and 5.2 GHz frequency bands is designed and implemented with 60% reduction in filter size. The fabricated filter achieves 3-dB fractional bandwidths of 38.6, 4.6, 10.14, and 5.3% while presenting an insertion loss of 0.65, 1.3, 1, and 1.8 dB, in the four bands, respectively. Out-of-band rejection better than 20dB is achieved up to a frequency 10.5 times the lowest operating frequency; this is attributed to the use of simple T-shaped feed lines both at the filter input and output. The measured results show good agreement with the predicted ones.","PeriodicalId":406498,"journal":{"name":"2017 Japan-Africa Conference on Electronics, Communications and Computers (JAC-ECC)","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126236457","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
Efficient implementation of pre-processing techniquesfor image forgery detection 有效实现图像伪造检测的预处理技术
2017 Japan-Africa Conference on Electronics, Communications and Computers (JAC-ECC) Pub Date : 2017-12-01 DOI: 10.1109/JEC-ECC.2017.8305777
A. Baumy, M. Abdalla, Naglaa. F Soiliman, F. El-Samie
{"title":"Efficient implementation of pre-processing techniquesfor image forgery detection","authors":"A. Baumy, M. Abdalla, Naglaa. F Soiliman, F. El-Samie","doi":"10.1109/JEC-ECC.2017.8305777","DOIUrl":"https://doi.org/10.1109/JEC-ECC.2017.8305777","url":null,"abstract":"Over the last few years, manipulation of digital images for forgery purpose with high quality has become popular using low-cost acquisition devices. Discrimination between tampered images and authentic images is required to ensure the origin of the data carried by images. In this paper, high-pass filtering and histogram equalization are used as pre-processing stages to reinforce the details of the images prior to forgery detection. The detail reinforcement process can achieve high classification accuracy. Illumination histogram is estimated after pre-processing and the peak value of the histogram derivative is estimated and used as a metric for forgery detection. The philosophy behind this strategy is that in the case of forgery, the forged regions are subject to different illumination conditions, and hence this can be reflected in the illumination histogram peaks. A thresholding approach is adopted in this paper. Probability Density Functions (PDFs) of the histogram derivative peaks are adopted for classification.","PeriodicalId":406498,"journal":{"name":"2017 Japan-Africa Conference on Electronics, Communications and Computers (JAC-ECC)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124006320","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
Impact of power amplifier non linearity on blind selective mapping for SC-FDMA system 功率放大器非线性对SC-FDMA系统盲选择映射的影响
2017 Japan-Africa Conference on Electronics, Communications and Computers (JAC-ECC) Pub Date : 2017-12-01 DOI: 10.1109/JEC-ECC.2017.8305768
M. A. A. El-Hamed, A. Zekry, S. Elagooz, F. El-Samie
{"title":"Impact of power amplifier non linearity on blind selective mapping for SC-FDMA system","authors":"M. A. A. El-Hamed, A. Zekry, S. Elagooz, F. El-Samie","doi":"10.1109/JEC-ECC.2017.8305768","DOIUrl":"https://doi.org/10.1109/JEC-ECC.2017.8305768","url":null,"abstract":"Single Carrier-Frequency Division Multiple Access (SC-FDMA) is recommended by Third generation partnership project-long term evolution (3GPP-LTE) for uplink transmission in future generation wireless communication systems. As a result of the peak-to average power ratio (PAPR) is one of the major issues for any kind of uplink transmission, Blind selective mapping technique is proposed in this paper as a PAPR reduction schemes. Simulation results show that the PAPR performance for the proposed B-SLM technique is approximately the same as the PAPR performance of the Convectional Selective Mapping C-SLM but, B-SLM technique provides a reduction in bandwidth without a significant degradation in Bit-Error Rate (BER) performance. Also the effect of solid state power amplifier (SSPA) on the performance of SC-FDMA system is investigate.","PeriodicalId":406498,"journal":{"name":"2017 Japan-Africa Conference on Electronics, Communications and Computers (JAC-ECC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134318678","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: 0
Requirements on the IoT communication platform and its standardization 物联网通信平台要求及其标准化
2017 Japan-Africa Conference on Electronics, Communications and Computers (JAC-ECC) Pub Date : 2017-12-01 DOI: 10.1109/JEC-ECC.2017.8305765
T. Yokotani
{"title":"Requirements on the IoT communication platform and its standardization","authors":"T. Yokotani","doi":"10.1109/JEC-ECC.2017.8305765","DOIUrl":"https://doi.org/10.1109/JEC-ECC.2017.8305765","url":null,"abstract":"The Internet of Things (IoT) is a topic of worldwide interest and is widely discussed. In Japan, the IoT Acceleration Consortium was established in June 2015 as an industry-university-government collaboration. To deploy various IoT services, it is important that the IoT platform provides information processing and communication network technologies. This study focuses on communication network technologies in the IoT platform. In IoT, a large number of data packets are transferred across communication networks. Therefore, some functions from conventional Internet technologies, such as access protocols and traffic control mechanisms, need to be enhanced for IoT. This study clarifies the network architecture, including wide area networks and area networks/proximity networks, for IoT. Then, it specifies the requirements of these networks and proposes technologies that can meet these requirements. The study also summarizes international standardization trends for networks in IoT and suggests future possibilities.","PeriodicalId":406498,"journal":{"name":"2017 Japan-Africa Conference on Electronics, Communications and Computers (JAC-ECC)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125109868","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: 6
Selective energy-based histogram equalization for mammograms 乳房x线照片选择性能量直方图均衡化
2017 Japan-Africa Conference on Electronics, Communications and Computers (JAC-ECC) Pub Date : 2017-12-01 DOI: 10.1109/JEC-ECC.2017.8305791
N. Elsawy, M. Sayed, F. Farag
{"title":"Selective energy-based histogram equalization for mammograms","authors":"N. Elsawy, M. Sayed, F. Farag","doi":"10.1109/JEC-ECC.2017.8305791","DOIUrl":"https://doi.org/10.1109/JEC-ECC.2017.8305791","url":null,"abstract":"Mammography is at present the best available technique for early detection of breast cancer. Mammography is a low-dose x-ray procedure that allows visualization of the internal structure of the breast. Detection and diagnosis of breast cancer in its early stage increases the chances for successful treatment and complete recovery of the patient. Contrast enhancement of mammogram images is necessary to enable the radiologist to detect breast cancer in early stage. This paper presents contrast enhancement algorithm for assisting the analysis of digital mammograms. According to the radiologists' opinion, the best contrast enhancement method does not affect the normal breast tissue while enhances the suspicious regions. The proposed Selective Energy-Based Histogram Equalization (SEBHe) algorithm depends on this notice. The SEBHE algorithm uses only the image areas with high energy to build the histogram unlike conventional histogram equalization algorithm that enhances all pixels of the mammogram image as well as the background noise. Hence, the proposed algorithm enhances only the areas with high details and leaves the normal breast tissue without enhancement.","PeriodicalId":406498,"journal":{"name":"2017 Japan-Africa Conference on Electronics, Communications and Computers (JAC-ECC)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121370643","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
Doubly selective channel estimation for OFDM systems OFDM系统的双选择信道估计
2017 Japan-Africa Conference on Electronics, Communications and Computers (JAC-ECC) Pub Date : 2017-12-01 DOI: 10.1109/JEC-ECC.2017.8305767
A. Marconi, Y. Mohasseb, H. Dahshan
{"title":"Doubly selective channel estimation for OFDM systems","authors":"A. Marconi, Y. Mohasseb, H. Dahshan","doi":"10.1109/JEC-ECC.2017.8305767","DOIUrl":"https://doi.org/10.1109/JEC-ECC.2017.8305767","url":null,"abstract":"We propose a new pilot-aided algorithm for estimating doubly selective fading channels in OFDM systems. Our approach is valid for time varying channel, which occur for example, in mobile WiMAX and DVB-T. For time invariant channels, our scheme yields perfect estimates. The proposed algorithm is based on the principle of basis expansion and relies on Legendre polynomials as bases functions. We are using the block-type pilot structure in our algorithm, in which a complete OFDM symbol is dedicated to pilots before transmitting the data symbols, which my vary in number according to channel conditions. Numerical simulations illustrate the gain in the performance, bandwidth, power efficiency, and complexity gains achieved by our schemes at high Doppler frequencies. Our approach does not require any prior statistical channel information.","PeriodicalId":406498,"journal":{"name":"2017 Japan-Africa Conference on Electronics, Communications and Computers (JAC-ECC)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125806686","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
Graphene based metamaterial lens for terahertz applications 用于太赫兹应用的石墨烯基超材料透镜
2017 Japan-Africa Conference on Electronics, Communications and Computers (JAC-ECC) Pub Date : 2017-12-01 DOI: 10.1109/JEC-ECC.2017.8305798
S. Zainud-Deen, H. Malhat, A. M. Mabrouk
{"title":"Graphene based metamaterial lens for terahertz applications","authors":"S. Zainud-Deen, H. Malhat, A. M. Mabrouk","doi":"10.1109/JEC-ECC.2017.8305798","DOIUrl":"https://doi.org/10.1109/JEC-ECC.2017.8305798","url":null,"abstract":"This paper introduces a graphene metamaterial transmitarray designed for terahertz applications. The unit-cell element is a multilayered metamaterial structure of a graphene split ring resonator (SRR) with two variable gaps with tunable conductivity. The metamaterial properties of the unit-cell element are investigated from 0.74 THz to 0.94 THz for different conductivities of the graphene material. A parametric study of the transmission properties of the metamaterial unit-cell element is investigated. The radiation characteristics of 169 unit-cell elements of the three layers graphene metamaterial lenses are analyzed for different applied DC voltages. The gain and side-lobe level of the proposed lens are improved by using an averaging process on the transmission phase used for array construction. The lens introduces a high gain of about 18.5 dB at frequencies 0.83 THz, 0.85 THz, and 0.86 THz for chemical potentials = 0.4eV, 0.5 eV, and 0.8eV, respectively. A full wave simulation is used to design and analyze the radiation characteristics of the graphene based metamaterial lens.","PeriodicalId":406498,"journal":{"name":"2017 Japan-Africa Conference on Electronics, Communications and Computers (JAC-ECC)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133009024","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
On the effectiveness of deliberate clipping PAPR reduction technique in OFDM systems OFDM系统中有意削波降噪技术的有效性研究
2017 Japan-Africa Conference on Electronics, Communications and Computers (JAC-ECC) Pub Date : 2017-12-01 DOI: 10.1109/JEC-ECC.2017.8305769
Mohamed Mounir, M. Youssef, I. Tarrad
{"title":"On the effectiveness of deliberate clipping PAPR reduction technique in OFDM systems","authors":"Mohamed Mounir, M. Youssef, I. Tarrad","doi":"10.1109/JEC-ECC.2017.8305769","DOIUrl":"https://doi.org/10.1109/JEC-ECC.2017.8305769","url":null,"abstract":"Orthogonal Frequency Division Multiplexing (OFDM) is used in high data rate wireless applications due to its ability to cope with frequency selectivity. However, OFDM suffers from high Peak-to-Average Power Ratio (PAPR) problem. Signals with high PAPR require Power Amplifier (PA) to work with large Input-Back-Off (IBO), which reduces the PA efficiency. On the other hand small IBO degrade BER performance and increases out-of-band (OOB) radiation. In literature, there are various PAPR reduction techniques. Among them deliberate clipping is the simplest, that has high deterministic PAPR reduction gain. In this paper, it will be shown that deliberate clipping is worsen the problem and cannot be used without Iterative Clipping Noise Cancellation (ICNC) in the receiver. On the other hand, ICNC increases the computational complexity of the receiver than that of the transmitter, so it recommended to be used in uplinks (ULs).","PeriodicalId":406498,"journal":{"name":"2017 Japan-Africa Conference on Electronics, Communications and Computers (JAC-ECC)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133739313","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: 14
A time inversion and symbol time compression (TI-STC) scheme for ICI cancellation in high mobility OFDM systems 一种用于高移动性OFDM系统中ICI对消的时间反转和符号时间压缩(TI-STC)方案
2017 Japan-Africa Conference on Electronics, Communications and Computers (JAC-ECC) Pub Date : 2017-12-01 DOI: 10.1109/JEC-ECC.2017.8305779
Mohammed. S. El-Bakry, Hamed. A. El-Shenawy, A. Ammar
{"title":"A time inversion and symbol time compression (TI-STC) scheme for ICI cancellation in high mobility OFDM systems","authors":"Mohammed. S. El-Bakry, Hamed. A. El-Shenawy, A. Ammar","doi":"10.1109/JEC-ECC.2017.8305779","DOIUrl":"https://doi.org/10.1109/JEC-ECC.2017.8305779","url":null,"abstract":"Conventional orthogonal frequency division multiplexing (OFDM) systems suffers from loss of orthogonality due to channel time variations. This leads to inter-carrier interference (ICI) which degrades the system performance. In this paper, the time inversion and symbol time compression (TI-STC) scheme is proposed for ICI cancellation in high mobility OFDM systems. The proposed TI-STC scheme includes time inversion (TI) process and symbol time compression (STC) process. The proposed TI-STC scheme alleviates ICI without loss of the system throughput compared to Frank's windowing scheme. The proposed TI-STC scheme operates efficiently up to 40% of normalized Doppler frequency compared to Frank's windowing scheme. The proposed TI-STC scheme is investigated in digital video broadcasting terrestrial-2 (DVB-T2) system under COST 207 typical rural (Ru) environment multi-path fading channel for BPSK modulation scheme. The numerical results show that the proposed TI-STC scheme improves the BER performance compared to Frank's windowing scheme.","PeriodicalId":406498,"journal":{"name":"2017 Japan-Africa Conference on Electronics, Communications and Computers (JAC-ECC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130486654","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: 9
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