FULL-RATE SPACE-TIME BLOCK CODE FOR FOUR TRANSMIT ANTENNAS WITH LINEAR DECODING

(Received: 3-Feb.-2020, Revised: 22-Apr.-2020 , Accepted: 7-May-2020)
This paper proposes a new full-rate space-time block code for MIMO systems at four transmit antennas, which aims at minimizing the bit error rate with low-complexity decoding using ZF and MMSE linear detection techniques in Rayleigh fading channels. The purpose of this code is to optimize the space-time resources offered by MIMO systems and to ensure optimal exploitation of spectral resources. The idea is to take advantage of the direct sequence spread spectrum (DSSS) technique using the orthogonal codes of Walsh-Hadamard in order to ensure the orthogonality between all the symbol vectors to be transmitted and to construct an orthogonal and full-rate STBC code. BER performance versus Eb/No of the proposed STBC code is evaluated for MIMO 4×2, 4×4 and MISO 4×1 configurations in single-user detection mode, using 16QAM modulation, on Rayleigh's MIMO channels assumed to be quasi-static and not frequency selective, compared with those of the orthogonal STBC of Tarokh of 1/2 rate and the full-rate quasi-orthogonal STBC of Jafarkhani. The results of the simulations show that the proposed STBC code significantly improves BER performance while allowing a higher transmission rate with spectral efficiency of 4 bits/s/Hz and simple linear decoding using ZF or MMSE techniques.

[1] Y. A. Eldemerdash, O. A. Dobre and B. J. Liao, "Blind Identification of SM and Alamouti STBC- OFDM Signals," IEEE Transactions on Wireless Communications, vol. 14, no. 2, pp. 972-982, 2015.

[2] S. D. Santumon and B. R. Sujatha, "Space-time Block Coding (STBC) for Wireless Networks," International Journal of Distributed and Parallel Systems (IJDPS), vol. 3, no. 4, 2012.

[3] R. Biradar and G. Sadashivappa, "Study and Analysis of 2×2 MIMO Systems for Different Modulation Techniques using MATLAB," International Journal of Advanced Research in Computer and Communication Engineering, vol. 4, no. 7, 2015.

[4] H. Sinha, M. R. Meshram and G. R. Sinha, "Performance Analysis of MIMO-STBC with Orthogonal Uncorrelated Channel," I-0aQaJHU’V -RXUQal on Wireless Communications Networks, vol. 6, no. 1, pp. 22-30, 2017.

[5] P. Pathak and R. Pandey, "A Novel Alamouti STBC Technique for MIMO System Using 16-QAM Modulation and Moving Average Filter," International Journal of Engineering Research and Applications, vol. 4, no. 8 (version 6), pp. 49-55, 2014.

[6] E. Ghayoula and R. Ghayoula, "Bit Error Rate Performance of MIMO Systems for Wireless Communications," World Academy of Science, Engineering and Technology, Electrical and Computer Engineering, vol. 2, no. 1, 2015. 214 Jordanian Journal of Computers and Information Technology (JJCIT), Vol. 06, No. 03, September 2020.

[7] E. T. Tchao, K. Diawuo, W. K. Ofosu and E. Affum, "Analysis of MIMO Systems Used in Planning a 4G-WiMAX Network in Ghana," International Journal of Advanced Computer Science and Applications (IJACSA), vol. 4, no. 7, 2013.

[8] Y. S. Cho, J. Kim, W. Y. Yang and C. Kang, MIMO-OFDM Wireless Communications with MATLAB, 1st Ed., Wiley-IEEE Press, 2010.

[9] P. Rabiei, N. Al-Dhahir and R. Calderbank, "New Rate-2 STBC Design for 2 TX with Reduced- Complexity Maximum Likelihood Decoding," IEEE Trans. on Wireless Communications, vol. 8, no. 2, pp. 1803–1813, 2009.

[10] F. Wang, A. Ghosh, C. Sankaran and S. Benes, "WiMAX System Performance with Multiple Transmit and Multiple Receive Antennas," Proc. IEEE 65th Vehicular Technology Conf. (VTC2007), pp. 2807- 2811, 2007.

[11] V. Tarokh, H. Jafarkhani and R. A. Calderbank, "Space-time Block Codes from Orthogonal Designs," IEEE Transactions on Information Theory, vol. 45, pp. 1456–1467, July 1999.

[12] H. Jafarkhani, "A Quasi-orthogonal Space-time Block Code," IEEE Transactions on Communications, vol. 49, no. 1, pp. 1–4, January 2001.

[13] O. Tirkkonen, A. Boariu and A. Hottinen, "Minimal Non-orthogonality Rate-1 Space-time Block Code for 3+ Tx Antennas," Proceedings of IEEE International Symposium on Spread Spectrum Techniques and Applications, ISSTA 2000, pp. 429–432, Sept. 2000.

[14] V. L. Nir, Etude et Optimisation des Systèmes Multi-antennes Associés à des Modulations Multiporteuses, Mémoire de Doctorat (PhD Thesis), INSA de Rennes, 2004.