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Performance analysis of diversity techniques for OFDM and base station cooperation
Ankara : The Department of Electrical and Electronics Engineering and the Institute of Engineering and Science of Bilkent University, 2010.Thesis (Master's) -- Bilkent University, 2010.Includes bibliographical references leaves 76-80.The main goal of the next generation wireless communication systems is to
provide high data rate services. In order to deal with performance-limiting challenges
that include frequency selective fading channels, power and bandwidth
constraints, multiple input multiple output (MIMO) and orthogonal frequency
division multiplexing (OFDM) techniques have been proposed as effective techniques
to combat fading and to provide high rate reliable transmission. In this
thesis we first give an overview of WiMAX as an example of an OFDM system
and study the performance of the WiMAX physical layer under different MIMO
techniques. We also analyze space-frequency coding and propose a threaded
algebraic space-time (TAST) based code.
Secondly, since the mobile bandwidth is an expensive and scarce resource, it
seems likely that a high frequency reuse will be employed in the future cellular
networks to increase spectral efficiency. This means that base stations (BSs) will
operate in the same frequency band and therefore cause cochannel interference
(CCI) to the users at other cells. CCI is an important performance degrading
factor. Therefore our second aim is to investigate BS cooperation techniques
to mitigate CCI. We assume that channel state information (CSI) is available at
the cooperating BSs and analyze the performance gains due to cooperation when
used in conjunction with Alamouti space-time coding.Üzeler, HandeM.S