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|Title:||PERFORMANCE EVALUATION OF SPACE-TIME CODED • OFDM SYSTEMS EMPLOYING CYCLIC PREFIX ESTIMATION TECHNIQUES|
|Authors:||Shrivastava, Vinay Kumar|
|Keywords:||ELECTRONICS AND COMPUTER ENGINEERING;EVALUATION-SPACE-TIME CODED;OFDM SYSTEMS;PREFIX ESTIMATION TECHNIQUES|
|Abstract:||Broadband wireless communications must cope with critical performance-limiting challenges that include time- and frequency-selective fading channels, as well as power and bandwidth constraints. Space-time (ST) coding offers an effective transmit-antenna diversity technique to combat fading. The space time coding methodologies integrate the techniques of antenna array spatial diversity and channel coding, and can provide significant capacity gains in wireless channels. However many wireless channels are frequency-selective in nature, for which the STC design problem becomes a complicated issue. On the other hand, the orthogonal frequency division multiplexing (OFDM) technique transforms a frequency-selective fading channel into parallel correlated fading channels. Hence, in the presence of frequency selectivity, it is natural to consider STC in the OFDM context. The channel state information is an essential requirement in the case of ST OFDM systems; hence there is an increased interest in formulating the channel estimation techniques for this system. In this dissertation, a unique channel estimation technique for MIMO OFDM systems exploiting the cyclic prefix of OFDM symbols has been proposed. The performance of the ST coded OFDM systems have been evaluated at realistic channel conditions, after employing variants of the suggested estimation technique.|
|Research Supervisor/ Guide:||Mehra, D. K.|
|Appears in Collections:||MASTERS' DISSERTATIONS (E & C)|
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