A
RESEARCH
PROPOSAL
On
MIMO
Wireless
System Technology
Submitted
to
Cultural
& Public Relations Department
Embassy
of Japan
Submitted
by
Deep
Raj Bhujel
Bachelor’s
Degree in Engineering
Electronics
and Communication Engineering
30-May-2013
ABSTRACT
Dead spots are everywhere. They're those areas of your home or office where, no matter how you position your router or how you point the antenna, you just can't get a Wi-Fi signal. Almost any Wi-Fi connection, even a weak one, is sufficient to surf the Internet or transfer data. But if distance and obstacles sap too much bandwidth from a network, video images will start to stutter and break up. Video is what's causing this problem on range and higher speed. The cure for the problem, is an innovation called MIMO, short for multiple input, multiple output .The new technology, uses a number of antennas to send multiple signals as a way to significantly increase the speed and range of a wireless network. In tests, it is found that MIMO nearly doubled the speed and provided superior range. Multiple-Input / Multiple Output (MIMO) technology has emerged in the last decade as a powerful means of increasing the throughput and performance of wireless communication systems. Research on this relatively new technology has penetrated in a substantial way many fields, ranging from signal processing to information / communication theory to wireless propagation. Equally importantly, MIMO technology has made its way into current and next generation communication standards and systems. In this paper, I will provide an overview of MIMO systems, starting with the fundamentals of capacity, random channels, basic transceiver architectures, diversity, space-time coding and channel estimation. I will then review some more recent results in the areas of diversity versus multiplexing trade-offs, input optimization / precoding, fundamental limits of coherent operation and multi-user MIMO, including systems with interference. Finally we will cover certain applications of MIMO techniques in current wireless systems.
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