Long-distance Wireless Communication Research Articles

Wireless Sensor Network Based Bridge Health Monitoring System for Long-Span Bridges

With the convenience to add or replace sensors, to maintain and extend, a new solution of wireless sensor network based bridge health monitoring system for long-span bridges was proposed, which includes advanced and low power-consumption sensors, wide-range short-distance wireless communication module, high-speed long-distance wireless communication module, efficient and practical management software. 433 MHz industrial wireless module was selected for short-distance wireless communication among nodes and between nodes and gateways. 3G WCDMA was chosen for long-distance wireless communication between gateways and the control centers. Whole process controlled management software was specially developed.

Design Concepts for a Hybrid Swimming and Walking Vehicle

This paper describes the design and proposed control methods for a 6-legged swimming and walking robot that can be used in a variety of different transportation and equipment control applications above ground, under water and above water. Known as the TURTLE (Tele–operated Unmanned Robot for Telemetry and Legged Exploration), a prototype of this mobile robot is currently being designed and developed for experimental testing in the near future. It will be powered by rechargeable electric batteries (to be recharged by solar panels) and all of its actuators will be electric motors, each controlled and monitored by onboard microcontrollers supervised by an onboard master computer. The TURTLE will be fitted with several high-resolution digital cameras, 3D laser and sonar scanners, an IMU (Inertial Management Unit), electronic compass, GPS (satellite navigation) module, underwater sonar transceiver hardware and two or more types of long-distance wireless communications hardware. The first prototype of the TURTLE will focus on basic tasks such as remote video surveillance, 3D terrain surface scanning (above ground and underwater), basic swimming styles, basic walking styles, climbing over large rocks and walking over very rough ground and steep terrain. This paper describes the main objectives, basic performance specifications, functions and mechanical design solutions that have been developed so far for this project. It covers details of the various different swimming modes and feasible solutions for achieving the main design objectives.

Power line enhancement for data monitoring of neural electrical activity in the human body

Distance and real-time data monitoring are the necessary condition that makes any system in good working order. Recent advancements in micro-electronics and wireless technology enable the application of wireless sensors in both industry and wild environments. However, Long-distance wireless communication has several drawbacks like limited bandwidth, considerable costs and unstable connection quality. Therefore, Power Line Communication (PLC) using pre-established Power Lines (PL) becomes more attractive for high data transmission technology. This paper reviews the existing distance data monitoring systems and presents a case study for data transferring of temperature and heart beat measurement. The simulations were carried out on the detected and transmitted signals of medical data using Matlab program. Furthermore, a framework of Intelligent Neural Monitoring System (INMS) is proposed for future works. The performance of PLC as a channel to transfer the patient Heart Rate (HR) is evaluated based on the Bit Error Rate (BER). Key words: Power line communication, electrical signals, data monitoring, lectrocardiogram, electromyogram, neural interfacing.

Development of a wireless sensor network system for suspension bridge health monitoring

A wireless sensor system has been suggested and tested in the place of forty five sensors of five types among the sensors used extensively in suspension bridges to prove the viability of wireless sensor network in actual implementation. ZigBee (IEEE 802.15.4) is used for short-distance communications among sensors and Code Division Multiple Access (CDMA) for long-distance wireless communications with remote locations. A data logger is integrated with a sensor and ZigBee into a one-channel data logger that combines sensor, logger and digital communication modules to allow for the addition or replacement of a sensor with ease. Lastly, the wireless sensor network-based bridge health monitoring system proposed herein is developed in the form of an application that is intended to ensure universal applicability and designed to maximize the ease of wireless sensor network. ► Reliable bridge structural health monitoring using wireless sensor network. ► Wireless sensor network test on a large suspension bridge. ► ZigBee for local sensor network and CDMA for long distance data transferring. ► Antenna type and memory buffer are important for the network reliability.

The Continuous Wave: Technology and American Radio, 1900-1932

Hugh Aitken describes a critical period in the history of radio, when continuous wave technology first made reliable long-distance wireless communication possible and opened up opportunities for broadcasting voice and music. Originally published in 1985. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.