Master of Science in Electrical Engineering (MSEE)
Electrical and Computer Engineering
The last decade we have witnessed an extraordinary growing interest in the field of wireless communications. Wireless industry has recently turned into a technology known as Multiple-Input Multiple-Output (MIMO) to minimize errors and optimize data speed. This is done by using multiple transmit and receive antennas, as well as appropriate space-time block code techniques. Due the fact that time-selective fading channels exist, the assumption that the channel is being static over the length of the codeword does not apply in this thesis. The channel state varies over the number of signal intervals, and in such case the orthogonality of the space-time block code will be destroyed leading to irreducible error floor. This thesis deals with orthogonal space-time block coding schemes where time-selective fading channels arise due to Doppler Effect. A realistic channel model was used, where the channel coherency was considered. Modeling the time-selective channels as random processes, a fast and simple decoding algorithm was derived at the receiver. Using MATLAB as a simulation tool, we provide simulation results demonstrating the performance for two, three, four, and five transmit antennas over time-selective fading channels. We illustrate that using multiple transmit antennas and space-time coding outstanding performance can be obtained, under the impact of channel variation.
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Erotokritou, Ioannis, "Space-time block coding for multiple transmit antennas over time-selective fading channels" (2006). LSU Master's Theses. 214.