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.

Design of intelligent detecting system based on wireless transmission

An intelligent detecting system based on wireless transmission is designed. Its hardware includes the card reading module, the wireless digital transmission module, the LCD module, the random password keyboard module and a 16×16 lattice word database based on e-Flash MM36SB020. Its software is a communication protocol between the central control computer and the entrance management base station. To resolve the conflicting problems occurred during the data transmission, a method of delaying time at random is proposed.

A New Method to Improve Performance of Cooperative Underwater Acoustic Wireless Sensor Networks via Frequency Controlled Transmission Based on Length of Data Links

In this paper a new method to improve performance of cooperative underwater acoustic (UWA) sensor networks will be introduced. The method is based on controlling and optimizing carrier frequencies which are used in data links between network nods. In UWA channels Pathloss and noise power spectrum density (psd) are related to carrier frequency. Therefore, unlike radio communications, in UWA Communications signal to noise ratio (SNR) is related to frequency besides propagation link length. In such channels an optimum frequency in whole frequency band and link lengths cannot be found. In Cooperative transmission, transmitter sends one copy of transmitted data packets to relay node. Then relay depending on cooperation scheme, amplifies or decodes each data packet and retransmit it to destination. Receiver uses and combines both received signals to estimate transmitted data. This paper wants to propose a new method to decrease network power consumptions by controlling and sub-optimizing transmission frequency based on link length. For this purpose, underwater channel parameters is simulated and analyzed in 1km to 10km lengths (midrange channel). Then link lengths sub categorized and in each category, optimum frequency is computed. With these sub optimum frequencies, sensors and base station can adaptively control their carrier frequencies based on link length and decrease network’s power consumptions. Finally Different Cooperative transmission schemes “Decode and Forward (DF)” and “Amplify and Forward (AF)”, are simulated in UWA wireless Sensor network with and without the new method. In receiver maximum ratio combiner (MRC) is used to combining received signals and making data estimations. Simulations show that the new method, called AFC cooperative UWA communication, can improve performance of underwater acoustic wireless sensor networks up to 40.14%.

Characterization of Blue-Green Light Non-Line-of-Sight Transmission in Seawater

The blue-green light in the 450 nm to 550 nm band is usually used in underwater wireless optical communication (UWOC). The blue-green light transmission in seawater is scattered by the seawater effect and can achieve communication in non-line-of-sight (NLOS) transmission mode. Compared to line-of-sight (LOS) transmission, NLOS transmission does not require alignment and can be adapted to various underwater environments. The scattering coefficients of seawater at different depths are different, which makes the scattering of light in different depths of seawater different. In this paper, the received optical power and bit error rate (BER) of the photodetector (PD) were calculated when the scattering coefficients of blue-green light in seawater vary from large to small with increasing depth for NLOS transmission. The results show that blue-green light in different depths of seawater in the same way NLOS communication at the same distance, the received optical power and BER at the receiver are different, and the received optical power of green light is greater than that of blue light. Increasing the forward scattering coverage of the laser will suppress the received optical power of the PD, so when performing NLOS communication, appropriate trade-offs should be made between the forward scattering coverage of the laser and the received optical power.

Mobile Positioning System Based on the Wireless Sensor Network in Buildings

Established on the Intel Multi-Core Embedded platform, using 802.11 Wireless Network protocols as the communication medium, combining with Radio Frequency-Communication and Ultrasonic Ranging, imple-ment a mobile terminal system in an intellectualized building. It can provide its holder such functions: 1) Accurate Positioning 2) Intelligent Navigation 3) Video Monitoring 4) Wireless Communication. The inno-vative point for this paper is to apply the multi-core computing on the embedded system to promote its com-puting speed and give a real-time performance and apply this system into the indoor environment for the purpose of emergent event or rescuing.

Wireless sensing system for environmental humidity and temperature monitoring

Aiming at the actual demand for monitoring environmental information,a wireless sensing system for temperature and relative humidity(RH)monitoring based on radio frequency(RF)technology and mobile network was designed.This paper introduces the architecture of the system.The system uses AVR micro controller unit(MCU),KYL-1020U RF module and SHT71 to complete real-time temperature and humidity monitoring,and uses SIM900A module to realize remote alarming and monitoring with short message system(SMS)through global system for mobile communication(GSM).Experimental results show that the designed system has good stability of measurement and real-time performance,and it can be used in some small temperature and humidity monitoring occasions.

爆炸冲击波超压无线数据传输系统设计

针对传统冲击波超压记录仪装置只配有RS422串口带来的移动性差、系统灵活性不足等问题,该文提出了一种冲击波超压数据无线传输方案。该方案在不改变记录仪原有性能的前提下,将串口转换为UDP/IP网口实现系统连入以太网,并搭建基于网桥的无线链路进行远程数据测试。通信测试结果表明,串口波特率为3 Mbps、发射端与接收端无明显遮挡且传输距离不大于1500 m的情况下,该无线数据传输系统通信稳定、无丢包情况,同时为传统没有嵌入以太网口的设备实现网络化管理提供了参考。

无线电能传输磁耦合系统损耗优化

在不含磁芯的无线电能传输WPT(wireless power transmission)系统中,由磁耦合系统引起的损耗是系统损耗的主要组成部分之一,而磁耦合系统的损耗由接收线圈、发射线圈的电阻以及流经收发线圈的电流所决定。结合串/串S/S(series/series)补偿拓扑无线电能传输的电路响应特性,分析磁耦合系统的线圈感量、线圈电阻与线圈匝数的关系,提出了根据发射、接收线圈电流工况调整收发线圈匝数的磁耦合系统线圈匝数组合优化设计方案。绕制3组不同匝数组合的收发线圈(含优化匝数组合及两组对照匝数组合线圈)用以验证优化方案的可行性。仿真及实验结果均表明:在相同工况下,优化组合方案的线圈总损耗均低于对照组,且整体样机的效率均高于对照组。

采用谐振补偿的无线电能传输实验设计

针对传统串、并联谐振电路实验内容单一、缺少应用实践问题。设计了无线电能传输系统实验。在巩固实验原理的基础上,增加了谐振补偿、线圈耦合、整流滤波和工作负载等,考虑无线电能传输系统的工程应用效率和性能,设计了不同谐振补偿组合方式下电能传输效率探索实验,并通过LED直观表征电路工作状态。实验设计具有一定的综合性,强化了理论知识与工程实践之间的联系,相比以验证性内容为主的谐振实验更易激发学生学习兴趣,有利于提高课程的教学效果。

Development of Pandemic Monitoring System Based on Constellation of Nanosatellites

Covid-19 is a global crisis and the greatest challenge we have faced.It affects people in different ways.Most infected people develop a mild to moderate form of the disease and recover without hospitalization.This presents a problem in spreading the pandemic with unintentionally manner.Thus,this paper provides a new technique for COVID-19 monitoring remotely and in wide range.The system is based on satellite technology that provides a pivotal solution for wireless monitoring.This mission requires a data collection technique which can be based on drones’technology.Therefore,the main objective of our proposal is to develop a mission architecture around satellite technology in order to collect information in wide range,mostly,in areas suffer network coverage.A communication method was developed around a constellation of nanosatellites to cover Saudi Arabia region which is the area of interest in this paper.The new proposed architecture provided an efficient monitoring application discussing the gaps related to thermal imaging data.It reached 15.8 min as mean duration of visibility for the desired area.In total,the system can reach a coverage of 5.8 h/day,allowing to send about 21870 thermal images.

基于ZigBee的无线图像传输的研究

建立基于ZigBee的无线图像传输系统。设计简单图像传输协议,详细介绍其图像数据帧格式,通过增加1个字节的帧计数建立确认机制和重传机制,保证图像数据帧的可靠传输。以C++Builder作为开发工具,主机软件采用多线程技术,结合简单图像传输协议,实现图像数据的快速传输及图像显示,提高数据传输速度。测试不同波特率下不同发送延时对图像传输的影响,给出实验结果并对影响图像传输速度的因素进行讨论。

红外报警系统设计

基于红外线隐蔽性和保密性高、可昼夜使用,且抗干扰能力强的特点,设计了一种红外报警系统.该系统包括子报警系统和父报警系统2部分,选用被动式红外传感器、单片机及Microsoft Visual Studio 2008等硬软件工具,实现了系统全部功能,并进行了调试和检验.该系统通过热释电红外传感器检测信号,放大处理后作为输出量传递给单片机,单片机控制发声、报警、闪灯、无线传输、串口通信.最终在电脑上报警系统软件实现了接收信号与报警功能,从而达到了异地双报警的目的.

TAP天车无线遥控器的设计

TAP天车无线遥控器是专门为铝厂设计的辅助出铝设备,可以实时的检测出铝状况;按功能分类遥控器含有遥控手柄和传输工具两部分,遥控手柄包含按键控制和液晶显示,传输工具有高频无线传输和串口RS-485;天车工可根据液晶显示屏上的信息及时对TAP天车进行操控,实现实时性;2.4G高频无线传输和RS-485传输速率高,有很强的抗干扰性,其中无线传输减少线路安装,保证了长距离的数据高速正常传播。

GPRS数据传输模块的设计与实现

本文旨在利用GPRS实现无线传输数据。首先介绍基于通用分组无线业务(GPRS)的无线数据传输技术,然后对应用单片机C51实现GPRS模块串口通信进行研究,给出硬件设计原理图,并且给出程序设计流程图。对基于C51的GPS和GPRS模块进行了仿真,提出用GPRS技术进行无线数据传输的实现方法。实践证明,利用GPRS传输数据与传统的数据传输方式相比,具有耗资小、体积小、分布广、使用灵活等优点。

一种气象数据无线传输与综合显示系统

为提高气象数据传输的灵活性,采用一种安装方便、性价比较高的无线模块来传输数据.常见气象仪器有一套独立的数据接收显示软件,但无法综合显示.开发一款软件,将VPF-730实时天气现象仪、WEATHERPAK-2000自动气象站数据和串口摄像头图像进行综合对比显示,并提供数据存储及历史数据查询基本功能.经实验验证,该系统运行稳定,数据显示效果较好.

基于VB6.0和串口无线通信的直流电机控制

利用VB6.0语言编程实现对机器人上直流伺服电机的控制,从而实现机器人的加速和恒速运行。分别将两块接口为标准的RS-232接口、型号为ZT-TR43C的无线数传模块,接到发、收的两台PC机上,并利用VB通信控件MSCommon实现串口无线通信,从而实现机器人的远程无线控制。实践证明了该无线控制方法的可行性,为机器人控制搭建了很好的平台。

TC35 GSM模块在无线传输系统中的应用

TC35 GSM是西门子公司为无线通信设计的一个宽频带GSM模块。本文介绍了该模块的无线传输基本特性,分析了该模块硬件接口电路的功能和作用,包括GSM基带处理器,ZIF连接器提供的4个应用接口:电源接口、串行接口、SIM卡接口、音频传输接口。并给出以TC35模块为通信核心的无线数据传输系统的设计方案。

基于无线数据传输的钢丝绳张力监测系统

介绍了一种用PIC16C73单片机控制的钢丝绳张力监测系统,由于矿井提升机工作环境的特殊性,检测的数据需要进行无线传输。给出了控制系统组成和工作原理,重点介绍了发送系统控制部分,给出了设计流程。该系统实现了低压无电缆线环境下的压力监测,提高了信号传输的可靠性和灵活性。它只需更换传感器和修改控制软件,就可以扩展到其他监控系统中。

基于nRF401的通用智能无线收发装置

介绍了一种通过单片机W77E58对无线收发芯片nRF401进行智能控制的通用无线收发装置的设计方法,包括硬件电路和软件部分的实现方法,并给出了主要的C51源代码。最后,进行了硬件电路的测试。开发的无线收发装置可以方便地嵌入各种带有串口的测量和控制系统中,实现无线数据的双向传输。

基于无线数传技术的远程水井监控系统

无线数据传输技术作为无线通信方式的一种近年来得到了广泛的关注及应用。介绍了应用无线数传技术实现数据传输构建的远程水井监控系统,该系统采用分布式结构,无线数传基于GD230B模块进行。对系统的组成、无线数传技术的应用、通信协议及监控系统的软件设计思路进行了详细分析。该系统已得到成功的应用,有效提高了监控与管理的效率。