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Title

Performance Improving of Digital Video Broadcasting-terrestrial (DVB-T2) Using Alamouti Scheme with Cyclic Delay Diversity

فصلنامه سیستم های اطلاعاتی و مخابرات، دوره: 3، شماره: 2
Year: 1394
COI: JR_JIST-3-2_005
Language: EnglishView: 323
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Authors

Behnam Akbarian - Department of Electrical Engineering, Yadegar-e- Imam Khomeini (RAH) Branch, Islamic Azad University, Tehran, Iran
Saeed Ghazi Maghrebi - Department of Electrical Engineering, Yadegar-e- Imam Khomeini (RAH) Branch, Islamic Azad University, Tehran, Iran

Abstract:

The goal of the future terrestrial digital video broadcasting (DVB-T) standard is to employ diversity and spatial multiplexing in order to achieve the fully multiple-input multiple-output (MIMO) channel capacity. The DVB-T2 standard targets an improved system performance throughput by at least 30% over the DVB-T. The DVB-T2 enhances the performance using improved coding methods, modulation techniques and multiple antenna technologies. After a brief presentation of the antenna diversity technique and its properties, we introduce the fact of the well-known Alamouti decoding scheme cannot be simply used over the frequency selective channels. In other words, the Alamouti Space-Frequency coding in DVB-T2 provides additional diversity. However, the performance degrades in highly frequency-selective channels, because the channel frequency response is not necessarily flat over the entire Alamouti block code. The objective of this work is to present an enhanced Alamouti space frequency block decoding scheme for MIMO and orthogonal frequency-division multiplexing (OFDM) systems using the delay diversity techniques over highly frequency selective channels. Also, we investigate the properties of the proposed scheme over different channels. Specifically, we show that the Alamouti scheme with using Cyclic Delay Diversity (CDD) over some particular channels has the better performance. Then, we exemplarity implement this scheme to the DVB-T2 system. Simulation results confirm that the proposed scheme has lower bit error rate (BER), especially for high SNRs, with respect to the standard Alamouti decoder over highly frequency-selective channels such as single frequency networks (SFN). Furthermore, the new scheme allows a high reliability and tolerability. The other advantages of the proposed method are its simplicity, flexibility and standard compatibility with respect to the conventional methods.

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Paper COI Code

This Paper COI Code is JR_JIST-3-2_005. Also You can use the following address to link to this article. This link is permanent and is used as an article registration confirmation in the Civilica reference:

https://civilica.com/doc/571105/

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Akbarian, Behnam and Maghrebi, Saeed Ghazi,1394,Performance Improving of Digital Video Broadcasting-terrestrial (DVB-T2) Using Alamouti Scheme with Cyclic Delay Diversity ,https://civilica.com/doc/571105

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