Mimo: - Technology to Advance Wireless Transmission Networks

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MIMO:- TECHNOLOGY TO ADVANCE WIRELESS TRANSMISSION NETWORKS
Prof. Navin Srivastava (Department of Electronics Engg.) Bharati Vidyapeeth Deemed University College of Engineering, Pune Email id-navinsri@gmail.com Ms Meena Chavan (Department of Electronics Engg.) Bharati Vidyapeeth Deemed University College of Engineering, Pune Email id-mschavan@bvucoep.edu.in Surya Prateek Soni (Department of Electronics Engg.) Bharati Vidyapeeth Deemed University College of Engineering, Pune Email id-suryaprateeksoni@gmail.com Shaurya Mishra (Department of Electronics Engg.) Bharati Vidyapeeth Deemed University College of Engineering, Pune Email id-shaurya.cherry@gmail.com

[A]ABSTRACT
The Conventional method of Wireless Transmission uses a Single Antenna each at the source and at the Destination giving rise to problems of Multipath Propagation. Multipath is the propagation phenomenon where transmitted information collides with ceilings, walls and other objects, which reaches the receiving antenna multiple times via different angles and at slightly different times causing a reduction in data speed and an increase in the number of errors. The objective of our paper is to portray a new technique that transforms the drawbacks of multipath propagation into a benefit for the user to improve communication performance. This paper presents a Multipath Fading Mitigation Technique that reduces the negative impact of the fading process. In our Paper, Multiple-Input Multiple-Output (MIMO) technology:a Wireless Technology uses Two Transmitters and Receivers each to transmit the multiple signals (one for each antenna) at the source and the destination. It promises to deliver the best solution to eliminate the trouble caused by multipath wave propagation. The outcome has better quality (lower bit-error-rate (BER)) or higher data rate than a single version of the signal.

SOLUTION TO MULTIPATH FADING: Multiple-Input Multiple-Output (MIMO): is a wireless technology that uses Multiple Transmitters and Multiple Receivers to transmit the multiple signals (one for each antenna) at the source and the destination, eliminating the trouble caused by multipath wave propagation. MIMO makes antennas work smarter by enabling them to combine data streams arriving from different paths and at different times to effectively increase receiver signal-capturing power. Thus, MIMO techniques have become the primary tool to improve wireless network parameters.

[B]INTRODUCTIONa
In wireless mobile radio communication, where reliable support for high data rate transmissions is required, there is an endless quest for increased capacity and improved quality. The domain of Wireless Networks is constantly evolving with newer and more capable hardware. Multiple inputs and multiple outputs has been treated as an emerging technology to meet the demands for higher data rate and better cell coverage even without increasing average transmit power or frequency bandwidth. The performance is often measured as the average bit rate (bit/s) the wireless link can provide or as the average bit error rate (BER). NEED FOR MIMO:Multipath is the propagation phenomenon where transmitted information bounces off walls, ceilings, and other objects, reaching the receiving antenna multiple times via different angles and at slightly different times(fig 1) causing a reduction in data speed and an increase in the number of errors, also causing interference and eventually in the loss of information.

Figure 2 PRINCIPLE OF MIMO:Each receiver antenna sees different versions of the transmitted signal and when these versions are combined in a proper manner, the outcome has better quality with Lower bit-error-rate (BER) or higher data rate than a single version of the signal. The ability to turn multipath propagation, which was earlier considered as a drawback of wireless transmission, is now considered as a boon for wireless communication systems. WORKING OF MIMO:In the basic MIMO concept, the data is to...
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