Improved Performance of Alamouti Scheme Using Cyclic Delay Diversity and Doppler Diversity for MIMO Systems-Based
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Improved Performance of Alamouti Scheme Using Cyclic Delay Diversity and Doppler Diversity for MIMO Systems‑Based Saeed Ghazi‑Maghrebi1 · Behnam Akbarian1
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract This paper addresses a novel Alamouti space frequency block decoding scheme for multiple-input multiple-output (MIMO) and orthogonal frequency division multiplexing (OFDM) based systems using diversity techniques over highly frequency selective channels. Unlike the standard Alamouti space-frequency block code (SFBC), that suffer from performance degradation in highly frequency-selective channels, the proposed method combats this problem. Also, this scheme has capability to combine with different methods such as OFDM and some special diversity such as: cyclic delay diversity (CDD) and discontinuous Doppler diversity (DDoD). In addition, a novelty transceiver using CDD is proposed, which performs valuable results. In this paper, this scheme is called “Efficient Δh-Alamouti with CDD”. This efficient Alamouti encoder and decoder allow a high reliability and capacity enhancement. In order to evaluate its capability, we have implemented this scheme for the second generation terrestrial video broadcasting (DVB-T2) system. The properties of the proposed scheme is investigated over different channels. Also, mathematical analyses and simulation results of the bit error performance for the modified encoding method with these diversity techniques, perform mostly better than the other forms of encoding Alamouti over highly frequency-selective channels such as single frequency networks (SFN). The other advantages of the proposed method are simplicity, flexibility and standard compatibility. Keywords Diversity · MIMO · OFDM · SFBC · Transceivers
* Saeed Ghazi‑Maghrebi [email protected] Behnam Akbarian [email protected] 1
Electrical Engineering Faculty, Yadegar‑e‑Imam Khomeini (RAH) Shahre Rey Branch, Islamic Azad University, Tehran, Iran
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S. Ghazi‑Maghrebi, B. Akbarian
1 Introduction The orthogonal frequency division multiplexing (OFDM) can be considered as a solution for transforming a frequency selective channel into multiple flat-fading channels [1, 2]. Moreover, the MIMO is a very popular technology to increase communications reliability. Combining OFDM modulation with MIMO technology can be used to overcome the multipath distortion and increasing robustness over wireless fading channels [3–7] For this propose, the authors in [8, 9] surveyed the Alamouti space–frequency code as a suitable multiple antenna technology. However, it needs a processing at both transmitter and receiver. Further, some technologies like space–time coding are constrained for providing reliable transmission with various designs such as the STBC transmission that relies on the combination of the spatial division multiplexing (SDM) and Alamouti STBC [10, 11]. Also, Alamouti method with transmit antenna selection in flat Rayleigh fading channels is investigated in [5, 12, 13].
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