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A Minimum Mean-Square-Error (MMSE) Decoder for Quasi-Orthogonal Space–Time Block Code

1st C4ISR Systems Team, C4ISR Systems Center, Defense Agency for Technology and Quality (DTaQ), Daegu 42037, Korea
Electronics 2019, 8(7), 732; https://doi.org/10.3390/electronics8070732
Received: 5 May 2019 / Revised: 19 June 2019 / Accepted: 23 June 2019 / Published: 27 June 2019
(This article belongs to the Section Microwave and Wireless Communications)
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Abstract

The quasi-orthogonal space–time block code (QO-STBC) was introduced to achieve a full transmission rate for the four antennas system. In this paper, a decoding method for the QO-STBC is proposed to improve the bit-error-rate (BER) and to solve a rank-deficient problem. The proposed algorithm is based on the minimum mean-square-error (MMSE) technique. To overcome the implementation problem from the MMSE, an estimation method of the noise variance is developed in this paper. The proposed algorithm is implemented without matrix inversion, therefore, the proposed algorithm achieves a better BER than the conventional algorithms, as it has a low computational complexity. The simulation results show the low BER of the proposed algorithm in a Rayleigh fading channel. View Full-Text
Keywords: multiple-input/multiple-output system; noise variance estimation; MMSE decoder; quadrature phase shift keying; wireless communications multiple-input/multiple-output system; noise variance estimation; MMSE decoder; quadrature phase shift keying; wireless communications
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Jeong, J.J. A Minimum Mean-Square-Error (MMSE) Decoder for Quasi-Orthogonal Space–Time Block Code. Electronics 2019, 8, 732.

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