Περίληψη:
The objectives of this thesis are the presentation of the fundamental notions of Multiple Input
Multiple Output (MIMO) systems and the creation of models simulating their behaviour. The
principal target through this process is to provide Bit-Error-Rate (BER) diagrams in order to
derive conclusions about the performance of such systems, especially in comparison to typical
Single Input Single Output (SISO) systems in multipath fading environments, namely to
prove that the employment of more antennas leads to enhanced results.
Emphasis is placed on the so called “Space-Time Block Coding” (STBC) technique, a method
that affords full diversity and requires straightforward linear operations at the transmission
and reception side. The software used to simulate such systems is Simulink-MATLAB.
Simulink is a block diagram environment for multidomain simulation and Model-Based
design. It affords the ability to model and analyze systems whose exits vary in time. Various
signal modulations (BPSK, QPSK, 8PSK, 16QAM) are employed.
However, before performing the simulations, a comprehensive analysis of the most significant
notions and guiding principles of wireless digital communications was considered essential to
be presented so as to provide the reader with the necessary knowledge and a solid grounding
in MIMO communication systems. In the conclusion we discuss the future of Multiple Input
Multiple Output systems and recommend alterations and further explorations that could lead
to the construction of more efficient and enhanced wireless communication systems.