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Coding and Decoding of perfect Space-time Block Codes: Analysis and Performance Evaluation

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dc.contributor.advisor Hailu, Ayele (PhD)
dc.contributor.author Aregawi, Gebresilassie
dc.date.accessioned 2018-12-13T12:11:01Z
dc.date.available 2018-12-13T12:11:01Z
dc.date.issued 2012-11
dc.identifier.uri http://etd.aau.edu.et/handle/123456789/15083
dc.description.abstract Multiple-input multiple-output (MIMO) is one of the most significant advances in digital communication which enabled to increase the data rate as well as improve the reliability and robustness of the system to as compared to single antenna systems. This is achieved by deploying multiple antennas both at the transmitter and receiver sides [1]. However, various assumptions about channel state information (CSI) and channel fading lead to different capacity results [2]. Fading can be reduced substantially by using diversity techniques. Space-time diversity is the most economic technique. Space-time block codes (STBCs) are the most widely employed space-time codes. Perfect space-time block codes (PSTBCs) are families of STBCs that satisfy all of the following criteria: full diversity, high rate, good constellation shaping, uniform average transmitted energy per antenna, nonvanishing determinant (NVD) for increasing spectral efficiency and diversity-multiplexing tradeoff (DMT). In this thesis, we investigate and demonstrate the coding and decoding of PSTBCs. We first give the design criteria of STBCs followed by the mathematical background of cyclic division algebra (CDA) as a constructing tool for PSTBCs. The PSTBCs are constructed and investigated to be the most efficient family of STBCs by the design criteria of STBCs. Having considered conditional optimization maximum likelihood (COML) as a near optimal yet less complex decoding scheme of PSTBCs, we demonstrated the decoding of Golden code, a family of PSTBC, as an example. Simulation results show that the symbol error rate of the COML decoding of the Golden code is almost equal to ML decoding with decoding complexity of only 2 which is the order of, V 4 for the conventional ML. Further, we considered the performance of the COML decoding under transmit, receive and both transmit and receive antenna correlations and found consistent complexity reduction. Although there is some deviation, in exact optimality of the COML decoding of the Golden code as of the previous works in the literature, which arise most probably due to the inaccuracy of the QAM quantization we used in this thesis, we conclude that an antenna PSTBC is near optimally COML decodable with a reduction in complexity of the order, from its respective ML. en_US
dc.language.iso en_US en_US
dc.publisher AAU en_US
dc.subject STBC en_US
dc.subject CDA en_US
dc.subject PSTBC en_US
dc.subject COML en_US
dc.title Coding and Decoding of perfect Space-time Block Codes: Analysis and Performance Evaluation en_US
dc.type Thesis en_US

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