Enabling Efficient Data Transmission in Wireless Sensor Networks-Based IoT Application

The use of the Internet of Things(IoT)is expanding at an unprecedented scale in many critical applications due to the ability to interconnect and utilize a plethora of wide range of devices.In critical infrastructure domains like oil and gas supply,intelligent transportation,power grids,and autonomous agriculture,it is essential to guarantee the confidentiality,integrity,and authenticity of data collected and exchanged.However,the limited resources coupled with the heterogeneity of IoT devices make it inefficient or sometimes infeasible to achieve secure data transmission using traditional cryptographic techniques.Consequently,designing a lightweight secure data transmission scheme is becoming essential.In this article,we propose lightweight secure data transmission(LSDT)scheme for IoT environments.LSDT consists of three phases and utilizes an effective combination of symmetric keys and the Elliptic Curve Menezes-Qu-Vanstone asymmetric key agreement protocol.We design the simulation environment and experiments to evaluate the performance of the LSDT scheme in terms of communication and computation costs.Security and performance analysis indicates that the LSDT scheme is secure,suitable for IoT applications,and performs better in comparison to other related security schemes.

Separate Dimming Controlling and Data Transmission for an Indoor Visible Light Communication System

Simultaneous dimming controlling and data transmission are usually required in a white LED based indoor visible light communication system.However,the diming controlling of LED normally interferes the data transmission due to the modulation nonlinearity of LED.In order to solve this problem,a scheme by separating the LEDs for the functions of dimming control and data transmission respectively is proposed in this paper.In the scheme,the LEDs used for dimming control function are driven by a dc amplified circuit,and the LEDs for data transmission are driven by a digital modulation circuit respectively.In this way,the modulation distortion to the data signal caused by the modulation nonlinearity can be avoided even if the dimming is at high level dc driven current.The proof-of-concept experiment of a 2.5Mbit/s visible light communication system demonstrates that the dimming controlling and data transmission can be realized simultaneously in a simple way,and the data transmission is not affected by the dimming controlling function.Compared to previous methods,the scheme in this paper is simpler and cost effective,and makes sense when high rate data is transmitted in a visible light communication system.

ANALYSIS OF MULTI-TONE INTERFERENCE SUPPKESSION IN HF SERIAL DATA TRANSMISSION SYSTEM

The multi-tone interference suppression in HF serial data transmission systemsis analyzed.Analytic expression for the tap weights and minimum mean square errors of theadaptive equalizer in HF serial systems are obtained.The rate of convergence of equalizer indicatethat the equalizer in HF serial system can not only track the rapid variation of HF channel butalso suppress the multi-tone interferences perfectly.

A Novel Secure Data Transmission Scheme in Industrial Internet of Things

The industrial Internet of Things(IoT)is a trend of factory development and a basic condition of intelligent factory.It is very important to ensure the security of data transmission in industrial IoT.Applying a new chaotic secure communication scheme to address the security problem of data transmission is the main contribution of this paper.The scheme is proposed and studied based on the synchronization of different-structure fractional-order chaotic systems with different order.The Lyapunov stability theory is used to prove the synchronization between the fractional-order drive system and the response system.The encryption and decryption process of the main data signals is implemented by using the n-shift encryption principle.We calculate and analyze the key space of the scheme.Numerical simulations are introduced to show the effectiveness of theoretical approach we proposed.

Development and prospect of downhole monitoring and data transmission technology for separated zone water injection

This article outlines the development of downhole monitoring and data transmission technology for separated zone water injection in China.According to the development stages,the principles,operation processes,adaptability and application status of traditional downhole data acquisition method,cable communications and testing technology,cable-controlled downhole parameter real-time monitoring communication method and downhole wireless communication technology are introduced in detail.Problems and challenges of existing technologies in downhole monitoring and data transmission technology are pointed out.According to the production requirement,the future development direction of the downhole monitoring and data transmission technology for separated zone water injection is proposed.For the large number of wells adopting cable measuring and adjustment technology,the key is to realize the digitalization of downhole plug.For the key monitoring wells,cable-controlled communication technology needs to be improved,and downhole monitoring and data transmission technology based on composite coiled tubing needs to be developed to make the operation more convenient and reliable.For large-scale application in oil fields,downhole wireless communication technology should be developed to realize automation of measurement and adjustment.In line with ground mobile communication network,a digital communication network covering the control center,water distribution station and oil reservoir should be built quickly to provide technical support for the digitization of reservoir development.

Data Aggregation-based Transmission Method in Ultra-Dense Wireless Networks

As the Internet of Things(IoT)advances,machine-type devices are densely deployed and massive networks such as ultra-dense networks(UDNs)are formed.Various devices attend to the network to transmit data using machine-type communication(MTC),whereby numerous,various are generated.MTC devices generally have resource constraints and use wireless communication.In this kind of network,data aggregation is a key function to provide transmission efficiency.It can reduce the number of transmitted data in the network,and this leads to energy saving and reducing transmission delays.In order to effectively operate data aggregation in UDNs,it is important to select an aggregation point well.The total number of transmitted data may vary,depending on the aggregation point to which the data are delivered.Therefore,in this paper,we propose a novel data aggregation scheme to select the appropriate aggregation point and describe the data transmission method applying the proposed aggregation scheme.In addition,we evaluate the proposed scheme with extensive computer simulations.Better performances in the proposed scheme are achieved compared to the conventional approach.

Application of Model-Based Data Transmission Techniques to Gravitational Model Data

The transmission of scientific data over long distances is required to enable interplanetary science expeditions. Current approaches include transmitting all collected data or transmitting low resolution data to enable ground controller review and selection of data for transmission. Model-based data transmission (MBDT) seeks to increase the amount of knowledge conveyed per unit of data transmitted by comparing high-resolution data collected in situ to a pre-existing (or potentially co-transmitted) model. This paper describes the application of MBDT to gravitational data and characterizes its utility and performance. This is performed by applying the MBDT technique to a selection of gravitational data previously collected for the Earth and comparing the transmission requirements to the level required for raw data transmis-sion and non-application-aware compression. Levels of transmission reduction up to 31.8% (without the use maximum-error-thresholding) and up to 97.17% (with the use of maximum-error-thresholding) resulted. These levels significantly exceed what is possible with non-application-aware compression.

On-Board Data Acquisition System for Automatic Shift System of Vehicle

Data acquisition, analysis and calibrating system affiliated with the vehicle is developed for the research on the automatic shift system (ASS). Considering the vehicle’s hard environment such as vibration, high and low temperature, electromagnetic disturbance and so on, the most suitable project is selected. PC104 transfers data with ECU by serial communication and a solid state disk is used as a FLASH ROM. Some techniques including frequency division of data is adopted in the software design in order to ensure the sampling frequency. The analysis and debug software is also contrived according to the characteristic of the ASS. The system plays an important role in the development of the ASS because of the good reliability and practicability in the application.

Application Research on Space Laser Communication in Bistatic Radar System

There exist three synchronizing problems in the bistatic radar system that some signals of the radar receiver must be synchronized with those of the radar transmitter. Several methods realizing data transmission, which are used to complete the synchronization existing in the bistatic radar system, are described. Then a new idea is brought forward that employs space laser communication in the bistatic radar system to realize its data transmission. The theoretic analysis of the idea's usability and its merits are discussed in details. Finally the latest development of space laser communication is introduced, and the utility of the idea is pointed out further.

FACT:An Air-Ground Communication Framework for Seeding Quality Control of Aircraft

A new type of air-ground communication application framework named FACT(framework for air-ground communication technology with weather-modification aircraft)is presented to track and command weather-modification aircraft to perform ideal cloud seeding.FACT provides a set of solutions from three perspectives,namely,onboard,onground and air-to-ground,with the core purpose of solving the problems of the rapid exchange of information,contract analysis and identifying potential seeding areas when flight plans and meteorological conditions change.On board,the observed data are processed centrally and transmitted downward through air-to-ground communication.The real-time application and sharing of aircraft detection data are strengthened on the ground,and potential areas of operation are automatically identified based on ground data.The communication between the air and the ground achieves a technical breakthrough by realizing double satellite links,adaptive data transmission and VPN channel encryption.Additionally,an application based on FACT is designed and implemented for the real-time command of weather-modified aircraft.This approach has become the key air-to-ground communication system support for more than 40 Chinese aircraft and the big data service support center of airborne data to ensure improved operation of weather-modification aircraft in China.

Designing of New Data Synchronization System

As the rapid development of Wireless Communications and the popularity of the Intelligent Terminal, data synchronization has been a social focus, meanwhile, user terminal devices are increasingly diversified, traditional synchronization technology based C/S mode has such deficiencies as insufficient amount of transmitting data and bad Real-time efficiency. It has become increasingly unable to meet the needs of future development. In this paper, we proposed and designed a new method and system by separating control with transmission to synchronize data to ensure Real-time data and improve efficiency.

塑闪探测器读出系统的高速串行数据传输模块设计

针对塑闪探测器读出系统对高速串行数据传输的需求,本文设计了一种基于FPGA的高速串行数据传输模块,旨在实现塑闪探测器读出系统的高效数据传输。该模块采用串行/解串(Serializer/Deserializer,SerDes)器件TLK2711,构建全双工点对点的串行通信协议,逻辑设计涵盖了控制模块、发送模块、接收模块以及发送/接收FIFO等。在FPGA平台上实现后,通过ModelSim进行仿真验证该模块在链路同步、数据帧传输和链路管理的表现。完成仿真后进行上板验证,实现了2.5 Gb/s的高速串行传输速率和小于10-12的误码率。这一设计显著提升了数据传输性能,为塑闪探测器读出系统的精确性和稳定性提供支持。

基于CH579的高速串口服务器

针对目前的串口到网口数据透传模块存在传输速度慢、稳定性差、串口参数无法远程配置等问题,设计了一种基于CH579型号单片机的高速串口转以太网服务器。该系统通过采用串口八级FIFO缓存方式提高数据传输速率,通过优化串口成帧机制降低丢包率从而提高系统稳定性,通过设计串口参数配置协议实现上位机对串口参数的远程配置。测试结果表明:系统进行透明传输时串口最高波特率能达到5 Mbit/s,平均丢包率为0.0650%。因此该系统在提高串口波特率,提升系统稳定性和通用性上有明显改善。

基于STM32的串口通讯及显示设计

以KEIL5集成开发环境为基础,两个STM32F103单片机为核心,设计两单片机之间串口通信。为增加人机交互性,分别设置独立按键和矩阵键盘控制单片机之间的串口通信,提出大长度及大数值数据收发方法,设置显示屏显示数据处理结果。实验表明,两种按键模式均可以实现数据的收发及显示,可用于不同的场景。

串行信号通信接收端的信号检测电路和方法

在高速串行信号传输过程中,接收端需要对信号传输线上的数据状态进行检测,继而调整工作模式。本文先介绍了信号检测电路的原理和传统结构,然后提出了一个基于电流反馈整流器的信号检测电路。提出的电路利用整流器将输入数据信号的幅度转换为电平信息,再与特定阈值比较来判断输入数据是否有效。在提出的电流反馈环路的辅助下,动态的偏置电流可以提高整流器在小信号幅度下的精度。因此,可以降低前级预放大器的增益,从而降低整体信号检测电路的功耗。

基于TLK2711的遥感卫星高速串行载荷数据接口设计

高分辨率遥感卫星星上载荷原始数据率不断提高,如何将高速载荷数据传输至后端数据处理设备已成为遥感卫星载荷接口设计的关键。在研究高速串行/解串(SerDes)收发器件TLK2711工作原理的基础上,提出了高速串行载荷数据传输接口的设计方案。通过在某卫星星载数据传输系统中的首次应用,实现了星上2Gbit/s的高速串行数据传输,工程试验和在轨验证表明了接口设计的正确性和可靠性,可为其它星载高速数据传输接口设计提供借鉴。

基于PCIE总线主模式DMA高速数据传输系统设计

介绍了一种基于PCIE总线主模式DMA高速数据传输系统的设计。该系统利用Xilinx公司V5系列的FPGA芯片搭建了x1通道的PCIE系统。实验利用自行开发的PCIE接口板实现了单字读写及DMA读写的传输方式,并在上位机软件界面上及Chip Scope中显示并验证了读写数据的正确性,经实验表明传输速率可稳定在400 MB/s左右。

基于FPGA的高速串行数据收发接口设计

针对传统ADC/DAC应用中采样数据并行传输存在线间串扰大、同步难等问题,设计了一种基于高速串行协议——JESD204B的数据收发接口。以Xilinx公司V7系列FPGA为核心控制单元设计电路,在单通道传输速率为6 Gb/s的条件下完成数据收发测试,验证了传输过程中数据的同步性、准确性及整体方案的可行性。设计结果表明,这种串行传输方式不仅解决了并行传输所带来的诸多问题,还降低了制板设计时PCB布线的复杂程度、减少了板层数量、节约了成本。

一种移动互联网序列化数据的传输优化方法

数据在移动互联网上通常被序列化成键值对形式实现传输。服务端向移动客户端返回数据集时,键值对的键因按照特定代码规范命名,导致其字符串过长;当移动终端发出复杂查询请求时,将所有查询条件合并为一个查询字符串后发送给服务端,因此,结构化的查询语句关键词被重复传输。针对上述两个增加网络延时、消耗用户流量的问题,在开发架构层面提出一种移动互联网上序列化数据传输优化方法,对实体类属性进行编码,以减少响应结果集的数据量;在复杂查询时,以键值对保存移动客户端发出的查询数据,服务端接收到该数据后只需解析对应的值,再通过一般处理程序中的特定函数即可获得查询内容。实验结果显示该优化传输方法可有效地减少交互数据量和网络响应时间。

基于FPGA的多格式数据传输设计

通过对数传接口数据的研究,提出了应用数传接口进行不同格式串行数据传输的设计。通过对不同种类数据的并串转换得到串行数据,将其进行不同的组合得到数传接口的多种格式数据,并基于FPGA进行了模块化设计。通过对其进行功能仿真、接口测试,以及对成像系统的图像数据的计算和分析,验证了该设计的正确性,并将其应用于某遥感相机的数传部分。该设计实现了数传接口的多格式数据传输,减少了数传接口的连接电缆和接口芯片的数量,有效地提高了数传接口的数据率,提高了数据传输应用的灵活性,对遥感相机的轻、小型化设计起到了重要的作用。