Abstract
This paper deals with the Maximum Likelihood (ML) decoding of the space-time block coding (STBC) scheme used in multiple-input-multiple output (MIMO) communication systems. Assume the existing wireless communication is the quasi-static fading channel scenario. Then the detection of the ML decoder will get very wretched especially when the decision statistic is large at the receiver side. To fix this drawback, the so-called active constellation extension (ACE) algorithm has been proposed to rectify the minimum Euclidean distance for ML decoding where the communication parameters are estimated. This paper presents a detailed study of diversity coding for MIMO systems. Different Complex orthogonal STBC for 3 and 4 transmit antennas are envisaged. Finally, these STBC techniques are implemented and analyzed for performance according to their bit error rates (BER) using QPSK, 8PSK, and 16-QAM modulation scenarios, and simulations are used to validate the robustness of our proposed scheme for Rayleigh fading channels.
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