Improving Efficiency By Using Synchronised Parallel Data Transmission Over Wsn

As the data transmission speed and the efficiency over the wireless network depend on the network or transfer device bandwidth. After physical implementation of wireless network which is difficult to dynamically control transfer in order to get high or low data transfer rate. Dedicating the fixed network for such a dynamic requirement network is not feasible. Many researchers are trying to enhance the wireless network speed by joining the transfer speed of multiple lines which will result in to asynchronous data transfer and data leakage. Hence the proposed system is to design and implements a dynamically controllable wireless network using the multiple radio frequency wireless devices. Here the proposed system will use multiple wireless devices and transfer data over multiple line depending upon the user configuration and synchronize the data over the receiving end. It will let the user control the wireless data transmission speed as per the requirement. ___________________________________________________________________________


Introduction
Wireless Sensor Networks (WSNs) are a new class of networking technology that is increasingly becoming popular today. Huge strides taken in sensing technology, low power microcontrollers and communication radio have spurred the mass production of relatively inexpensive sensor nodes. Such large scale sensor networks far reimburse use of conventional networks in situations where terrain, climate and other environmental constraints obstruct the deployment and setting up of regular networks. Because of the tremendous scale at which such nodes can be deployed, they are extremely robust in terms of individual node failures which make them all the more favorable in such extreme situations. There has been an explosion in the use of sensor networks for environmental measurement and study. A range of applications have been built using sensor networks, from environmental monitoring to radiation detection to lots of tracking applications.
Broadly, sensor applications can be categorized into data gathering or tracking. Data gathering applications use sensor nodes to periodically measure the value of a particular environmental variable and recorded values are collected by a sink node for further processing. A WSN typically consists of a large number of low-cost, lowpower and multifunctional sensor nodes that are deployed in a region of interest. These sensor nodes are small in size but are equipped with sensors, embedded microprocessors and radio transceivers and thus they have not only sensing capability, but also data processing and communicating capabilities.
Sensor networks have the following unique characteristics and constraints: Building a wireless node with capability to broadcast a computer passed messages and receives the incoming messages.
1. Develop a windows based application to read and write data over the wireless devices. 2. Develop a windows based application to split the data or files in to multiple chunks or part and merge those parts back in to single file until the product is approved.

Transmission Modes
Thetransmission mode refers to the number of elementary units of information (bits) that can be simultaneously translated by the communications channel. Infact, processors (and therefore computer sin general) never process (in the case of recent processors) as single bit at a time generally they are able to process several(most of the time It is 8:one byte),and for this reason the basic connections on a computer are parallel connections.

Parallel Connection
Parallel connection means simultaneous transmission of N bits. These bits are sent simultaneously over N different channels (a channel being,for example, a wire, a cable or any other physical medium).The parallel connection on PC-type computers generally requires 1 0 wires.

Serial Connection
In a serial connection, the data are sent one bit at a time over the transmission channel. However, since most processors process data in parallel, the transmitter needs To transform in coming parallel data in to serial data and the receiver needs to do the opposite. These operations are performed by a communications controller (normally a UART(Universal Asynchronous Receiver Transmitter)chip).

Rf communication usingtransceiver:
When time and RF engineering experience is of abundance, a designer may opt to use RF integrated circuits (chips or chipsets) to save on RF component costs. Using chips/chipsets, the designer actually develops the hardware and software workings of the product. While the individual chips/chipsets offer functionality the designer must dictate how those chips will work in concert with the software the designer will develop. This task is not for the faint of heart, as completed designs must also pass rigid regulatory testing for deployment in the various regions of the world. The regulatory approval process alone can become months or years of a cycle of rejection, followed by a reworking of the product and continued by rejection and reworking (transmitter / receiver) modules offer a faster time-to-market alternative to chips/chipsets that allow designers at all levels of RF experience to integrate a completed wireless system into their products. Many modules are manufactured as a drop-in solution where designers create a compatible pin-out on their processor board and supply serial data to the appropriate pins.
Modules offering the easiest integration allow the designer to send raw UART data into the module and expect that same data out on the receiving end of the wireless link.Wireless transceiver modules allowing the quickest time-to-market are also FCC and other regulatory agency approved. That means jurisdictions accepting FCC approval allow designers using FCC approved modules to bypass further testing for their wireless products. In Europe and other countries, pre-approved modules by ETSI and other regulatory bodies allow the designer to deploy products in various regions of the world with minimal additional approvals. The completed RF design and agency approval of many wireless transceiver modules make them a popular choice in the fast-paced world of wireless data communication product design.

Experimental Setup
To evaluate the performance of the proposed system in WSNs, an extensive stimulation using Network stimulator 2.35 is performed. The simulation parameter is shown in  For the network set up, a set of 24 nodes are considered. The 24 nodes are as a normal nodes at the network. In our proposed system out of 24 nodes 12 nodes are act as a sender nodes and 12 nodes are receiver nodes. The connection is established through transceiver between sender and receiver nodes.

Conclusion And Future Scope
Large wireless sensor networks will be increasingly deployed in many application areas, among other improvements the individual node will offer increased storage and processing capacity. This implies that more data need to be transmitted in wireless sensor networks. More extensive computation tasks can be executed by sensor network, distributed storage and parallel processing will see rapid development. This research work focuses simultaneous transmission of data using multiple transceivers in wireless sensor networks. The system performance is assessed using three sets of transceivers as 4 sets of 2 transceivers, 4 sets of 4 transceivers, 4 sets of 6 transceivers .In the experiment, multiple wireless devices are used and data is transferred on multiple lines depending upon the user configuration and the data is synchronized at the receiving end. Through extensive simulation and result analysis we can conclude that the system performance improves for more simultaneous transmissions