Improve the BER Performance of 64PSK, 4×2 STBC using (8,4) exHamming  Turbo Product Code

Abd AlCathem Khother, Samir

	Improve the BER Performance of 64PSK, 4×2 STBC using (8,4) exHamming Turbo Product Code
Journal of University of Babylon
Article 1, Volume 21, Issue 5, 2013, Pages 1507-1519
Author
Samir Abd AlCathem Khother
Abstract
M array space time block code (STBC) system can provide high data rate wireless services in a rich scattering environment multi input multi output (MIMO) channel but increasing modulation order (M) degrades the bit error rate (BER) performance of the system. The aim of this work is to improve the BER performance of 64PSK STBC using turbo product code .This paper gives an introduction to the basic concepts of MIMO channel and explains the implementation of the 4 transmitters STBC encoder/ decoder. The two main parts used in STBC decoder, channel estimator and maximum ratio combiner, were illustrated. Channel estimator was build using orthogonal pilot training sequence. Finally product block code and its iterative decoding using soft in soft out maximum likelihood decoder were illustrated. Computer simulation for four different space time block codes schemes including rate 1, 0.75 STBC's as well as two rate 0.5 STBC's with two different code dimensions are explored. These STBC's techniques are implemented in MATLAB2010 and analyzed for BER performance according to their modulation order (M=4, 16 and 64PSK) and number of receiver antennas (Nr=1, 2, 4 and 8). Finally, (8,4) exHamming turbo product code was combined with 64PSK 4×2 STBC's system and evaluate the new BER performance in MIMO Rayleigh fading channel.

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