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Optimal communication frequency for switching cabled ocean networks with commands carried over the power line Research Article

Yan-hu Chen, Yu-jia Zang, Jia-jie Yao, Gul Muhammad,yanhuchen@zju.edu.cn

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 10,   Pages 1331-1343 doi: 10.1631/FITEE.1900125

Abstract: s with tree or ring topologies play an important role in real-time ocean exploration. Due to the time-consuming need for field maintenance, technology that can actively switch the power on/off on certain branches of the network becomes essential for enhancing the reliability and availability of the network. In this paper, a novel switching-control method is proposed, in which we invert the power transmission polarity and use the current on the power line as the digital signal at low frequency to broadcast information with the address and commands to the network, and the corresponding (BU) can decode and execute the switching commands. The cable’s parasitic parameters, the network scale, and the number of BUs, as the influencing factors of the on the power line, are theoretically studied and simulated. An optimized frequency that balances the executing accuracy and rate is calculated and proved on a simulated prototype. The results showed that the technology with optimized frequency can enhance the switching accuracy and configuring rate.

Keywords： 海缆开断；海洋观测网；分支单元；传输线理论；通信频率    

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Research and Application of V/F-based Intelligent Multiplex Data-collecting System & Serial Communication

Jia Guixi,Li Hongfeng,Qi Wei

Strategic Study of CAE 2004, Volume 6, Issue 11,   Pages 58-62

Abstract:

This system can collect and check temperatures. It uses AD620 amplifier to magnify signals, LM331 voltage-frequency transformer to transform electricity quantity in the A/D transforming part, and 80C51 chip to collect and store data to communicate with PC by using Visual Basic6.0 language. This paper also offers the data from the Meijiang District to which the system is applied.

Keywords： voltage-frequency transformer LM331     Visual Basic6.0     serial communication    

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A novel grey wolf optimizer and its applications in 5G frequency selection surface design Research Article

Zhihao HE, Gang JIN, Yingjun WANG

Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 9,   Pages 1338-1353 doi: 10.1631/FITEE.2100580

Abstract: In , more connections are built between metaheuristics and electromagnetic equipment design. In this paper, we propose a self-adaptive (SAGWO) combined with a novel optimization model of a 5G (FSS) based on FSS unit nodes. SAGWO includes three improvement strategies, improving the initial distribution, increasing the randomness, and enhancing the local search, to accelerate the convergence and effectively avoid local optima. In benchmark tests, the proposed optimizer performs better than the five other optimization algorithms: original (GWO), genetic algorithm (GA), particle swarm optimizer (PSO), improved (IGWO), and selective opposition based grey wolf optimization (SOGWO). Due to its global searchability, SAGWO is suitable for solving the optimization problem of a 5G FSS that has a large design space. The combination of SAGWO and the new FSS optimization model can automatically obtain the shape of the FSS unit with electromagnetic interference shielding capability at the center operating frequency. To verify the performance of the proposed method, a double-layer ring FSS is designed with the purpose of providing electromagnetic interference shielding features at 28 GHz. The results show that the optimized FSS has better electromagnetic interference shielding at the center frequency and has higher angular stability. Finally, a sample of the optimized FSS is fabricated and tested.

Keywords： Grey wolf optimizer     Fifth-generation wireless communication system (5G)     Frequency selection surface     Shape optimization    

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Consideration on Developing Mobile Satellite Communication

Zhang Naitong,Zhang Zhongzhao,Chu Haibin,Liu Huijie

Strategic Study of CAE 2002, Volume 4, Issue 10,   Pages 11-16

Abstract:

Three kinds of international constellation communication system are introduced in this paper, and the constitution, configuration, function, and existing problems of some representative systems are analyzed. The paper discusses the development and trend of the satellite communication system, and then some viewpoints on developing mobile satellite communication system are put forward.

Keywords： mobile satellite communication     constellation communication system     broad band service    

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Calculation and research on deepwater drilling riser flexural equation and natural frequency

Jiang Wei

Strategic Study of CAE 2011, Volume 13, Issue 5,   Pages 66-73

Abstract:

Flexural equation was established in this paper, which was based on application of deepwater drilling riser and Ritz methods in elastoplastic mechanics. Axial tension, inclination angle, lateral gravity components and axial gravity components were considered. Therefore, simple calculation method for natural frequency of drilling riser was achieved. Free-hinged beam was taken as constraint condition of flexural equation combined with drilling string real conditions, which made research approach practical work more. Purpose of research was to provide reasonable design and selection for deepwater drilling riser, and provide a more efficient and applied method, which would show guiding significance for deepwater drilling operation.

Keywords： deepwater drilling     drilling riser     flexural equation     natural frequency     shape function    

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Third Generation Mobile Communication——The IP Oriented Application of Modern Wireless Communication Technology

Wu Hequan

Strategic Study of CAE 2000, Volume 2, Issue 8,   Pages 69-75

Abstract:

The article firstly reviews the evolution of the 1st generation (analogy) mobile communication system and the 2nd generation (digital) mobile communication system, and predicts that deployment of mobile communication systems will be enter a development period at a more great rate in the next decate. The mobile communication service will extend from voice to data, and the mobile communication technology will transits from circuit mode to packet mode. Following briefly addressing the second and half generation mobile communication system (2.5 GM) that will come to application soon, introduces the 3rd generation mobile communication (3 GM) for broadband multimedia application. Some schemes as mainstream of 3GM RTT (radio transmission technology) standards and the key technologies, especially technical features of TD - SCDMA presented by China, are emphatically described. Finally, The transition strategy from 2GM to 3GM and the development trend of 3GM core network are prospected in this article.

Keywords： mobile communication     third generation mobile communication     CDMA     TD - SCDMA    

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From Terahertz Imaging to Terahertz Wireless Communications Review

Yi Huang,Yaochun Shen,Jiayou Wang

Engineering 2023, Volume 22, Issue 3,   Pages 106-124 doi: 10.1016/j.eng.2022.06.023

Abstract:

Terahertz (THz) technology is probably best known to the public as a powerful tool for imaging, since it has been applied in security and medical scanning, resulting in numerous impressive images that would be unobtainable using other technologies. With the roll-out of 5G mobile networks, research into 6G wireless communications is heating up. It is envisioned that THz technology will be used for 6G and future wireless communications. In this paper, we review how THz technology has been employed for imaging and wireless communications, identify state-of-the-art developments in the field, and then examine and compare common devices and issues in both applications. The possibility of integrating THz imaging/sensing and wireless communications is considered, and challenges and future perspectives are presented and discussed. It is shown that THz technology is indeed a key enabling technology for both imaging and wireless communications in the future.

Keywords： Communications     Imaging     Terahertz technology     Wireless communications    

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Microwave－Optical Frequency Standards at NIM：Realizing of Definition of Metre and Second

Li Tianchun

Strategic Study of CAE 2007, Volume 9, Issue 6,   Pages 27-31

Abstract:

  The paper presents the realization,  at NIM,  of SI time unit second using the NIM4 cesium fountain clock,  SI length unit meter using a femto-second (FS) optical frequency comb and calibration of wavelengths of stabilized lasers by this FS comb. The uncertainty of NIM4 fountain clock was evaluated as 5 × 10 - 15.  The frequency uncertainty of the FS optical comb locked to a H-maser, which is steered by NIM4 clock,  was estimated as 2. 2 × 10 - 14.  The function,  significance of Cs fountain clock, stabilized lasers,  optical comb and relationship among them are discussed. Finally the progress of NIM5 fountain clock and the construction of a Sr atom optical clock started in 2006 at NIM are reported.

Keywords： metrology     frequency standard     stabilized laser     Cs fountain clock     FS optical comb    

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The Development Trent of Advanced Communication Technology

Bi Houjie

Strategic Study of CAE 2000, Volume 2, Issue 8,   Pages 31-34

Abstract:

In this paper, the development trend of advanced communication network terminals is summarized and analyzed. It is instructive to point out that industrialization of communication software and development of the EDA technology must be strengthened in order to meet the challenge of entering WTO.

Keywords： telecommunication network     grouping     multimedium     mobility     communication terminal    

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Researches and Suggestions on Development Strategy of Military Anti-jamming Communication Engineering

Yao Fuqiang

Strategic Study of CAE 2005, Volume 7, Issue 5,   Pages 24-29

Abstract:

Based on expatiating the covering range of military anti-jammjing communication equipments and analyzing the development current of anti-jamming communication abroad, this paper researches emphatically the development strategy of military anti-jamming communication engineering, and puts forward some suggestions in this field, for the new military revolution and informzation construction of the PLA.

Keywords： military communication     anti-jamming     electronic defence    

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Research on Prony’s method modeling in multi-target detection of stepped-frequency radar

Hu Tiling,Li Xingguo

Strategic Study of CAE 2008, Volume 10, Issue 10,   Pages 67-71

Abstract:

Stepped-frequency signal is a broad band signal which enhances range resolution of radar at the cost of increasing bandwidth. Baseband signal that is received in stepped-frequency radar can be thought of as the linear combination of exponential function which contains target information, while Prony algorithm is a mathematical mode which uses a linear combination of exponential function to describe equal space between sampling data. Extended Prony algorithm is applied to stepped-frequency radar, which can obtain more exact target information and overcome the shortcomings of using IDFT to synthesize high resolution range profiles. Corresponding modeling analysis and experiment simulation explain the advantages of Prony's method.

Keywords： high resolution radar     stepped-frequency signal     extended Prony’s method     multi-scattering center    

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Meteorological Telecommunication Network &Computer Systems Engineering

Li Huang,Wang Chunhu

Strategic Study of CAE 2000, Volume 2, Issue 9,   Pages 101-106

Abstract:

As the information infrastructure for the meteorological services in China, meteorological telecommunication networks and computer systems have made great progress in terms of networking and computer applications. For the 21st century, the meteorological services in China will continue to be improved with leaps and bounds, the meteorological information infrastructure will also be further strengthened and along developed the expansion and advance of the national information infrastructure. This article introduces the developments regarding both meteorological telecommunication networks and computer systems, and presents the status of the construction in modernized system projects of China Meteorological Administration as well as it´s engineering applications .

Keywords： telecommunication network     computer     systems engineering    

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FrepJoin: an efficient partition-based algorithm for edit similarity join Article

Ji-zhou LUO, Sheng-fei SHI, Hong-zhi WANG, Jian-zhong LI

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 10,   Pages 1499-1510 doi: 10.1631/FITEE.1601347

Abstract: String similarity join (SSJ) is essential for many applications where near-duplicate objects need to be found. This paper targets SSJ with edit distance constraints. The existing algorithms usually adopt the filter-andrefine framework. They cannot catch the dissimilarity between string subsets, and do not fully exploit the statistics such as the frequencies of characters. We investigate to develop a partition-based algorithm by using such statistics. The frequency vectors are used to partition datasets into data chunks with dissimilarity between them being caught easily. A novel algorithm is designed to accelerate SSJ via the partitioned data. A new filter is proposed to leverage the statistics to avoid computing edit distances for a noticeable proportion of candidate pairs which survive the existing filters. Our algorithm outperforms alternative methods notably on real datasets.

Keywords： String similarity join     Edit distance     Filter and refine     Data partition     Combined frequency vectors    

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A 0.20–2.43 GHz fractional-

Wei Zou, Daming Ren, Xuecheng Zou,weizou@hust.edu.cn,damingren@hust.edu.cn,estxczou@hust.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 2,   Pages 141-286 doi: 10.1631/FITEE.1900653

Abstract: A 0.20–2.43 GHz fractional- is presented for multi-band wireless communication systems, in which the scheme adopts low voltage-controlled oscillators (VCOs) and a with reduced . VCOs that determine the out-band of a phase-locked loop (PLL) based are optimized using an automatic amplitude control technique and a high-quality factor figure-8-shaped inductor. A CP with a mismatch suppression architecture is proposed to improve the current match of the CP and reduce the PLL phase errors. Theoretical analysis is presented to investigate the influence of the on the output performance of PLLs. Fabricated in a TSMC 0.18-µm CMOS process, the prototype operates from 0.20 to 2.43 GHz. The PLL synthesizer achieves an in-band of −96.8 dBc/Hz and an out-band of −122.8 dBc/Hz at the 2.43-GHz carrier. The root-mean-square jitter is 1.2 ps under the worst case, and the measured reference spurs are less than −65.3 dBc. The current consumption is 15.2 mA and the die occupies 850 µm×920 µm.

Keywords： Frequency synthesizer     Charge pump (CP)     Voltage-controlled oscillator (VCO)     Current mismatch     Phase noise    

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An improved Merkle hash tree based secure scheme for bionic underwater acoustic communication Research Articles

Masoud Kaveh, Abolfazl Falahati,afalahati@iust.ac.ir

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 7,   Pages 1010-1019 doi: 10.1631/FITEE.2000043

Abstract: Recently, bionic signals have been used to achieve covert underwater acoustic communication (UWAC) with high signal-to-noise ratios (SNRs) over transmission systems. A high SNR allows the attackers to proceed with their mischievous goals and makes transmission systems vulnerable against malicious attacks. In this paper we propose an based secure scheme that can resist current underwater attacks, i.e., replay attack, fabricated message attack, message-altering attack, and analyst attack. Security analysis is performed to prove that the proposed scheme can resist these types of attacks. Performance evaluations show that the proposed scheme can meet UWAC limitations due to its efficiency regarding energy consumption, communication overhead, and computation cost.

Keywords： 海豚哨音；改进Merkle哈希树；安全水声通信（UWAC）    

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Title Author Date Type Operation

Optimal communication frequency for switching cabled ocean networks with commands carried over the power line

Yan-hu Chen, Yu-jia Zang, Jia-jie Yao, Gul Muhammad,yanhuchen@zju.edu.cn

Journal Article

Research and Application of V/F-based Intelligent Multiplex Data-collecting System & Serial Communication

Jia Guixi,Li Hongfeng,Qi Wei

Journal Article

A novel grey wolf optimizer and its applications in 5G frequency selection surface design

Zhihao HE, Gang JIN, Yingjun WANG

Journal Article

Consideration on Developing Mobile Satellite Communication

Zhang Naitong,Zhang Zhongzhao,Chu Haibin,Liu Huijie

Journal Article

Calculation and research on deepwater drilling riser flexural equation and natural frequency

Jiang Wei

Journal Article

Third Generation Mobile Communication——The IP Oriented Application of Modern Wireless Communication Technology

Wu Hequan

Journal Article

From Terahertz Imaging to Terahertz Wireless Communications

Yi Huang,Yaochun Shen,Jiayou Wang

Journal Article

Microwave－Optical Frequency Standards at NIM：Realizing of Definition of Metre and Second

Li Tianchun

Journal Article

The Development Trent of Advanced Communication Technology

Bi Houjie

Journal Article

Researches and Suggestions on Development Strategy of Military Anti-jamming Communication Engineering

Yao Fuqiang

Journal Article

Research on Prony’s method modeling in multi-target detection of stepped-frequency radar

Hu Tiling,Li Xingguo

Journal Article

Meteorological Telecommunication Network &Computer Systems Engineering

Li Huang,Wang Chunhu

Journal Article

FrepJoin: an efficient partition-based algorithm for edit similarity join

Ji-zhou LUO, Sheng-fei SHI, Hong-zhi WANG, Jian-zhong LI

Journal Article

A 0.20–2.43 GHz fractional-

Wei Zou, Daming Ren, Xuecheng Zou,weizou@hust.edu.cn,damingren@hust.edu.cn,estxczou@hust.edu.cn

Journal Article

An improved Merkle hash tree based secure scheme for bionic underwater acoustic communication

Masoud Kaveh, Abolfazl Falahati,afalahati@iust.ac.ir

Journal Article