Graduate Thesis Or Dissertation
 

A wireless communications systems based on space time block coding and QAM transmission

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/ws859j96p

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  • Modern applications in wireless communications systems demand the capability of high transmission rate. Engineers have to find optimum solutions to transmit the signal over fading environments. In this study, we propose the combination of space-time diversity techniques and optimum QAM constellation design, in order to further improve performance. Specifically, we use prior knowledge of the channel behavior to design adequate mapping techniques to generate a QAM constellation from a MPSK constellation typically used in coherent space time block coding application, so that superior performance is achieved. We do this be designing QAM constellation sets that minimize the symbol error probability from the known information of the transmission medium. We study the system performance for each constellation set in both AWGN and quasi-static Rayleigh fading channels. Various multi-level QAM systems are evaluated using Monte Carlo simulation and maximum likelihood detection. System performance is assessed using bit error rate (BER) and symbol error rate (SER) versus SNR plots.
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