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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/2346

Title: PERFORMANCE ANALYSIS OF SPACE TIME CODING ON MIMO AND COOPERATIVE DIVERSITY SYSTEM
Authors: DEREJE, GIRMA
Advisors: DR.DEREJE HAILEMARIAM
Keywords: CODING
COOPERATIVE
MIMO
Copyright: Jul-2011
Date Added: 3-May-2012
Publisher: AAU
Abstract: In a wireless network, users can relay information to exploit cooperative diversity, thereby increasing reliability. The uses of multiple transmit and receive antennas (MIMO) can help to exploit transmit and receive diversity respectively. This thesis discusses the application of a technique called space time block coding (STBC) on a system based on the joint use of cooperative diversity and MIMO schemes, which we hope intuitively that the system performance can be increased further. A source node, equipped with two transmits antennas, first encodes incoming data using STBC and then broadcasts the resulting code to relay and destination nodes. Then, the two relay nodes, each equipped with single antenna, either amplify-and-forward (AF) or decode-and-forward (DF) the received codes to the destination. The destination node combines (e.g., using maximum ratio combining signal in order to recover the original data. As the signals from the source and relay are received through different paths, which are assumed to be spatially independent, spatial diversity can be exploited. Compared with point-to-point transmission system and simple Alamouti STBC system with no relays, AF based STBC system obtains one additional benefit, achieving spatial diversity offered by the relays. Moreover, the STBC-based DF cooperative system has two additional benefits. First, it achieves the spatial diversity offered by the relay channel and secondly, it has the ability to introduce the characteristics of STBC into the relay system. In addition, the system model and performance evaluation of these systems in various channel conditions and modulations (using simulation) will be addressed.
URI: http://hdl.handle.net/123456789/2346
Appears in:Thesis - Communication Engineering

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