Recent Trends in Communication Networks最新文献

Recent Trends in Communication Networks Pub Date : 2020-08-26 DOI: 10.5772/intechopen.92154

Bashar M. Nema, Ali Nafaa Jaafar

引用次数: 0

Recent Trends in Communication Networks Pub Date : 2020-08-26 DOI: 10.5772/intechopen.86478

I. Kubiak

{"title":"Electromagnetic Eavesdropping","authors":"I. Kubiak","doi":"10.5772/intechopen.86478","DOIUrl":"https://doi.org/10.5772/intechopen.86478","url":null,"abstract":"Protection of information against electromagnetic penetration is a huge challenge. Especially this issue applies to computer station that processes protected information and that is a source of electromagnetic disturbances. These disturbances could be correlated with processed graphic information. Therefore, very often, they are called valuable or unintentional emissions. To protect the information, different methods of engineering of electromagnetic compatibility are used, e.g. electromagnetic gaskets, signal and power filters and electromagnetic shielding. The use of these methods causes a special device to become very heavy, and the looks of such device aren’t nice. A new universal solution based on safe fonts is proposed. Safe fonts protect processed information against electromagnetic penetration in each case of graphic source of valuable emissions. These fonts protect not only Video Graphics Array (VGA) but also Digital Video Interface (DVI) standards. These fonts are also useful from electromagnetic protection’s point of view in the case of the use of laser printers. All analyses are based on images reconstructed from valuable emissions. These emissions are measured in a range of frequencies from 100 MHz to 1.5 GHz. Safe fonts are simple solution that counteract electromagnetic eavesdropping process. They can replace expensive solutions based on shielding, zoning and filtering.","PeriodicalId":361416,"journal":{"name":"Recent Trends in Communication Networks","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114523372","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 Mobile Ad Hoc Network Routing Protocols: A Comparative Study 移动自组织网络路由协议的比较研究

Recent Trends in Communication Networks Pub Date : 2020-07-02 DOI: 10.5772/intechopen.92550

A. Rajeswari

引用次数: 4

Secure and Energy-Efficient Communication in IoT/CPS 物联网/CPS中的安全节能通信

Recent Trends in Communication Networks Pub Date : 2020-05-30 DOI: 10.5772/intechopen.92039

S. Alharthi, P. Johnson, M. Randles

引用次数: 2

A Survey on Piracy Protection Techniques in Digital Cinema Watermarking Schemes 数字影院水印方案中防盗版技术研究综述

Recent Trends in Communication Networks Pub Date : 2020-04-27 DOI: 10.5772/intechopen.92412

B. Zolfaghari, P. Mitra

引用次数: 0

Application of Random Walk Model for Timing Recovery in Modern Mobile SATCOM Systems 随机游走模型在现代移动卫星通信系统时序恢复中的应用

Recent Trends in Communication Networks Pub Date : 2019-12-24 DOI: 10.5772/intechopen.90606

T. Nguyen, Hung H. Nguyen, Tom Freeze, Andy T. Guillen

{"title":"Application of Random Walk Model for Timing Recovery in Modern Mobile SATCOM Systems","authors":"T. Nguyen, Hung H. Nguyen, Tom Freeze, Andy T. Guillen","doi":"10.5772/intechopen.90606","DOIUrl":"https://doi.org/10.5772/intechopen.90606","url":null,"abstract":"In a modern mobile satellite communication (SATCOM) system, a ground terminal receiver receives a radio frequency signal that is demodulated to generate a baseband digital signal waveform containing a self-clocking bit stream of digital data. The received baseband digital signal waveform is recovered and tracked using a timing recovery loop (TRL). The traditional TRLs use early-and-late gates, digital transition tracking, filter-and-square, and delay-and-multiply functions. In bit timing detection, the bit stream is self-clocking and the timing differential dithers about correct bit timing in the TRLs. For mobile satellite communication environments, the traditional TRLs drop lock when the loop signal-to-noise ratio (SNR) is smaller than a threshold value or the residual Doppler frequency is larger than the operating loop bandwidth. After dropping lock, the traditional TRLs experience long hang up time due to the need to reacquire the timing pulses. Recently, random walk filters (RWF) have been adapted to improve the bit clock locking stability and are applied to recover bit timing information of a digital data stream. This chapter describes random walk model for timing jitter and discusses how RWF solution can address the timing recovery challenges in mobile satellite communication environments.","PeriodicalId":361416,"journal":{"name":"Recent Trends in Communication Networks","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114493425","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

Understanding of On-Chip Power Supply Noise: Suppression Methodologies and Challenges 片上电源噪声的理解:抑制方法和挑战

Recent Trends in Communication Networks Pub Date : 2019-12-23 DOI: 10.5772/intechopen.90378

Pritam Bhattacharjee, Prerna Rana, A. Majumder

{"title":"Understanding of On-Chip Power Supply Noise: Suppression Methodologies and Challenges","authors":"Pritam Bhattacharjee, Prerna Rana, A. Majumder","doi":"10.5772/intechopen.90378","DOIUrl":"https://doi.org/10.5772/intechopen.90378","url":null,"abstract":"The on-chip activities of any modern IC are always inhibited due to the occurrence of power supply noise (PSN) in the chip power line. From many decades, researchers are pondering on what are the major issue of this PSN occurrence and how it can be suppressed without interfering the actual chip functioning. In the course of time, it is found that the uncontrolled triggering of the on-chip system clock and the unguarded on-chip power line is instigating the two major factors for the occurrence of PSN i.e., i(t) → instantaneous current and di/dt → current ramp or the rate of change of current over time. Both i(t) and di/dt are also the sub-fac-tors to rise the PSN components like resistive noise and inductive noise respectively. In this chapter, we light upon the occurrence of resistive and inductive noise as well as depict their individual impact on the PSN occurrences. There is also discussion on how PSN is suppressed over the years in spite of facing challenges in the execution of suppression techniques. This chapter even concludes on the suitable ways for mitigating PSN in the contemporary era of delivering complex on-chip features.","PeriodicalId":361416,"journal":{"name":"Recent Trends in Communication Networks","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121435422","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

Cognitive Radio-Modulation and Demodulation 认知无线电调制与解调

Recent Trends in Communication Networks Pub Date : 2019-12-19 DOI: 10.5772/intechopen.89774

Madhuri Gummineni, Trinatha Rao Polipalli

{"title":"Cognitive Radio-Modulation and Demodulation","authors":"Madhuri Gummineni, Trinatha Rao Polipalli","doi":"10.5772/intechopen.89774","DOIUrl":"https://doi.org/10.5772/intechopen.89774","url":null,"abstract":"The reconfigurability in Cognitive Radio (CR) facilitates to dynamically change its parameters for the efficient spectrum utilization. The motivation behind the study of cognitive radio is that the number of different radio signals can be handled without using extra circuitry, i.e., reusing identical hardware with the change in the software will reduce time to market, development cost, and upgrade infrastructure. Software Defined Radio (SDR) is an enabling technology for Cognitive Radio (CR); therefore, it emphasizes on SDR unique features, characteristics, and basics concepts that are required to understand operation of SDR. SDR allows service providers to upgrade infrastructure without unreasonable cost. Modulation techniques play a vital role in any communication systems such as cable modems, DSL modems, CDMA, 4G, Wi-Fi, and WIMAX; thus, it emphasizes on implementation of modulation techniques using SDR Generic hardware, which is operated by Open Source software called GNU Radio. Implementation of various analog and digital modulation techniques using the GNU Radio provides a way for developing advanced wireless communication system. GNU Radio software is a highly flexible signal processing platform, which makes it easy and reduces time to implement different modulation techniques with appropriate script.","PeriodicalId":361416,"journal":{"name":"Recent Trends in Communication Networks","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115588896","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

A Survey on Adaptive Multimedia Streaming 自适应多媒体流研究综述

Recent Trends in Communication Networks Pub Date : 2019-12-13 DOI: 10.5772/intechopen.86125

Kunwar Pal, M. C. Govil, Mushtaq Ahmed, Tanvi Chawla

引用次数: 2

Design and Analysis of Analog to Digital Converter System Clock Source Using Direct Digital Synthesizer 基于直接数字合成器的模数转换系统时钟源设计与分析

Recent Trends in Communication Networks Pub Date : 2019-12-05 DOI: 10.5772/intechopen.90243

D. Tung, R. Mohd-Mokhtar

{"title":"Design and Analysis of Analog to Digital Converter System Clock Source Using Direct Digital Synthesizer","authors":"D. Tung, R. Mohd-Mokhtar","doi":"10.5772/intechopen.90243","DOIUrl":"https://doi.org/10.5772/intechopen.90243","url":null,"abstract":"A requirement of multiple format standards by mobile telecommunication (GSM, CDMA, WCDMA, and TD-SCDMA) test set needs to be delivered possibly at lower cost. As to support its capability, phase-locked loop (PLL) frequency synthesizer has been designated as an essential part in most of the design within the box. The old design may be bulky and subject to many issues with the components ’ variation and aging effect. In recent years, the direct digital synthesizer (DDS) has been popularly in used to replace the PLL architecture. This chapter will focus on the DDS selection, architecture topology, prototyping, implementation technique with both hardware and software, and performance as a clock source to a sampled system as referred to receiver interest. The key parameters in the sampled system greatly rely on the jitter and phase noise specification. If they are not properly defined, the overall signal-to-noise ratio (SNR) at the sampled system output will be impacted. Eventually the receiver quality will be degraded and resulted in tremen-dous loss. Thus, a proper reconstruction filter design will be delivered to ensure the jitter and phase noise performance is met without degrading the existing specification by taking accountability into the matching characteristic and signal integrity.","PeriodicalId":361416,"journal":{"name":"Recent Trends in Communication Networks","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132010762","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