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A cooperative diversity transmission scheme by superposition coding relaying for a wireless system with multiple relays.

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Title: A cooperative diversity transmission scheme by superposition coding relaying for a wireless system with multiple relays.
Authors: Liu, Yang1 ly@bupt.edu.cn, Man, Yi1 manyi@bupt.edu.cn, Song, Mei1 songm@bupt.edu.cn, Zhang, Hongtao2 htzhang@bupt.edu.cn, Wang, Li1 liwang@bupt.edu.cn
Source: Wireless Networks (10220038). Aug2015, Vol. 21 Issue 6, p1801-1817. 17p.
Subjects: Scheme programming language, Coding theory, Relaying (Electric power systems), Wireless sensor networks, Computer simulation
Abstract: This paper proposes a cooperative diversity transmission scheme by superposition coding relaying (SC-relaying) for a wireless system with multiple relays. In this scheme, two layer signals, i.e., signal $${x_1}$$ and $${x_2}$$ , are transmitted from a base station (BS) in the first and the second time slot, while signal $${x_1}$$ is also forwarded from multiple relays to a user in the second time slot. The two layer signals ( $${x_1}$$ and $${x_2}$$ ) meet and superimpose with each other in the air in the second time slot. Then successive interference cancellation (SIC) is used for decoding at the user. In this paper, the optimal power allocation that maximizes the sum throughput of $${x_1}$$ and $${x_2}$$ is first studied. Then the optimal number of selected relays and optimal transmission rate at the BS is derived. Finally the outage probability and diversity gain of the transmission of $${x_1}$$ and $${x_2}$$ is evaluated for system robustness. Simulation results show that the proposed scheme realizes the goal of increasing spectral efficiency and enhancing system robustness. [ABSTRACT FROM AUTHOR]
Copyright of Wireless Networks (10220038) is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: A cooperative diversity transmission scheme by superposition coding relaying for a wireless system with multiple relays.
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  Data: <searchLink fieldCode="AR" term="%22Liu%2C+Yang%22">Liu, Yang</searchLink><relatesTo>1</relatesTo><i> ly@bupt.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Man%2C+Yi%22">Man, Yi</searchLink><relatesTo>1</relatesTo><i> manyi@bupt.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Song%2C+Mei%22">Song, Mei</searchLink><relatesTo>1</relatesTo><i> songm@bupt.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Hongtao%22">Zhang, Hongtao</searchLink><relatesTo>2</relatesTo><i> htzhang@bupt.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Wang%2C+Li%22">Wang, Li</searchLink><relatesTo>1</relatesTo><i> liwang@bupt.edu.cn</i>
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  Data: <searchLink fieldCode="DE" term="%22Scheme+programming+language%22">Scheme programming language</searchLink><br /><searchLink fieldCode="DE" term="%22Coding+theory%22">Coding theory</searchLink><br /><searchLink fieldCode="DE" term="%22Relaying+%28Electric+power+systems%29%22">Relaying (Electric power systems)</searchLink><br /><searchLink fieldCode="DE" term="%22Wireless+sensor+networks%22">Wireless sensor networks</searchLink><br /><searchLink fieldCode="DE" term="%22Computer+simulation%22">Computer simulation</searchLink>
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  Data: This paper proposes a cooperative diversity transmission scheme by superposition coding relaying (SC-relaying) for a wireless system with multiple relays. In this scheme, two layer signals, i.e., signal $${x_1}$$ and $${x_2}$$ , are transmitted from a base station (BS) in the first and the second time slot, while signal $${x_1}$$ is also forwarded from multiple relays to a user in the second time slot. The two layer signals ( $${x_1}$$ and $${x_2}$$ ) meet and superimpose with each other in the air in the second time slot. Then successive interference cancellation (SIC) is used for decoding at the user. In this paper, the optimal power allocation that maximizes the sum throughput of $${x_1}$$ and $${x_2}$$ is first studied. Then the optimal number of selected relays and optimal transmission rate at the BS is derived. Finally the outage probability and diversity gain of the transmission of $${x_1}$$ and $${x_2}$$ is evaluated for system robustness. Simulation results show that the proposed scheme realizes the goal of increasing spectral efficiency and enhancing system robustness. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Wireless Networks (10220038) is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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              Text: Aug2015
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