Abstract :
The advantages and risks of deploying wireless equipment in electricity substations are outlined, the resulting research motivation described and the research objectives defined. The character of the noise environment is considered and an estimate of likely antenna noise temperature at the frequencies used is made by extrapolation of ITU noise prediction models wireless sensor network is a group of smart sensors, each capable of sensing, processing and communicating, but when deployed in numbers, form a network which collectively monitor the state of the physical world. Wireless local area networks (LANs) are playing a major role in the information technology revolution. They are finding their way into a wide variety of markets including financial sectors, corporations, health care, and education. For example, wireless devices are used in New York stock exchange for trade reporting its applications and potential benefits are tremendous and seem only limited by imagination. As any technology at its infancy stage, there are plenty of challenges and obstacles lying ahead. One of the factors that could have had an adverse impact on the market for wireless devices is the interoperability issue between products developed by different vendors. However, the IEEE has developed the 802.11 standard, compliance with which should alleviate this issue. Other factors that will impact the long-term success of wireless LANs largely depend on improving the technology, reducing installation costs, and predicting the market and customer needs. While initial costs to install a wireless LAN infrastructure may be greater than its wired counter-part, in the long-term, benefits due to the wireless network can be significantly higher when the users are constantly mobile. The interdisciplinary nature makes the design challenges wide and deep, from network protocols, power provisioning, to programming models, just to name a few. This survey paper gives a brief overview on what wireless sensor network is, what the current design challenges are, and presents a variety of programming models that had been proposed.
